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2878 lines
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<title>Logging ยท NATS</title>
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<li class="chapter " data-level="1.1" data-path="../">
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<a href="../">
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Introduction
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</a>
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<li class="chapter " data-level="1.2" data-path="../whats_new/whats_new_20.html">
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What's New in 2.0
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FAQ
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</li>
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<li class="header">Concepts</li>
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<li class="chapter " data-level="2.1" data-path="../developer/concepts/intro.html">
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<a href="../developer/concepts/intro.html">
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What is NATS
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</a>
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Subject-Based Messaging
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</a>
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Publish-Subscribe
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</a>
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<li class="chapter " data-level="2.4" data-path="../developer/concepts/reqreply.html">
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<a href="../developer/concepts/reqreply.html">
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Request-Reply
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</a>
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</li>
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<li class="chapter " data-level="2.5" data-path="../developer/concepts/queue.html">
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<a href="../developer/concepts/queue.html">
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Queue Groups
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</a>
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</li>
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<li class="chapter " data-level="2.6" data-path="../developer/concepts/acks.html">
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<a href="../developer/concepts/acks.html">
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Acknowledgements
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</a>
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</li>
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<li class="chapter " data-level="2.7" data-path="../developer/concepts/seq_num.html">
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<a href="../developer/concepts/seq_num.html">
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Sequence Numbers
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</a>
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</li>
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<li class="header">Developing With NATS</li>
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<li class="chapter " data-level="3.1" data-path="../developer/">
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<a href="../developer/">
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Introduction
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</a>
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</li>
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<li class="chapter " data-level="3.2" data-path="../developer/connecting/intro.html">
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<a href="../developer/connecting/intro.html">
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Connecting
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.2.1" data-path="../developer/connecting/default_server.html">
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<a href="../developer/connecting/default_server.html">
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Connecting to the Default Server
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</a>
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</li>
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<li class="chapter " data-level="3.2.2" data-path="../developer/connecting/specific_server.html">
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<a href="../developer/connecting/specific_server.html">
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Connecting to a Specific Server
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</a>
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</li>
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<li class="chapter " data-level="3.2.3" data-path="../developer/connecting/cluster.html">
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<a href="../developer/connecting/cluster.html">
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Connecting to a Cluster
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</a>
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</li>
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<li class="chapter " data-level="3.2.4" data-path="../developer/connecting/connect_timeout.html">
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<a href="../developer/connecting/connect_timeout.html">
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Setting a Connect Timeout
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</a>
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</li>
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<li class="chapter " data-level="3.2.5" data-path="../developer/connecting/pingpong.html">
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<a href="../developer/connecting/pingpong.html">
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Ping/Pong Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.2.6" data-path="../developer/connecting/protocol.html">
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<a href="../developer/connecting/protocol.html">
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Controlling the Client/Server Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.2.7" data-path="../developer/connecting/noecho.html">
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<a href="../developer/connecting/noecho.html">
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Turning Off Echo'd Messages
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.3" data-path="../developer/reconnect/intro.html">
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<a href="../developer/reconnect/intro.html">
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Automatic Reconnections
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.3.1" data-path="../developer/reconnect/disable.html">
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<a href="../developer/reconnect/disable.html">
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Disabling Reconnect
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</a>
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</li>
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<li class="chapter " data-level="3.3.2" data-path="../developer/reconnect/max.html">
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<a href="../developer/reconnect/max.html">
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Set the Number of Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.3" data-path="../developer/reconnect/wait.html">
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<a href="../developer/reconnect/wait.html">
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Pausing Between Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.4" data-path="../developer/reconnect/random.html">
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<a href="../developer/reconnect/random.html">
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Avoiding the Thundering Herd
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</a>
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</li>
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<li class="chapter " data-level="3.3.5" data-path="../developer/reconnect/events.html">
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<a href="../developer/reconnect/events.html">
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Listening for Reconnect Events
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</a>
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</li>
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<li class="chapter " data-level="3.3.6" data-path="../developer/reconnect/buffer.html">
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<a href="../developer/reconnect/buffer.html">
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Buffering Messages During Reconnect Attempts
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.4" data-path="../developer/security/intro.html">
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<a href="../developer/security/intro.html">
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Securing Connections
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.4.1" data-path="../developer/security/userpass.html">
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<a href="../developer/security/userpass.html">
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Authenticating with a User and Password
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</a>
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</li>
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<li class="chapter " data-level="3.4.2" data-path="../developer/security/token.html">
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<a href="../developer/security/token.html">
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Authenticating with a Token
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</a>
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</li>
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<li class="chapter " data-level="3.4.3" data-path="../developer/security/nkey.html">
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<a href="../developer/security/nkey.html">
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Authenticating with an NKey
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</a>
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</li>
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<li class="chapter " data-level="3.4.4" data-path="../developer/security/creds.html">
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<a href="../developer/security/creds.html">
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Authenticating with a Credentials File
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</a>
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</li>
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<li class="chapter " data-level="3.4.5" data-path="../developer/security/tls.html">
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<a href="../developer/security/tls.html">
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Encrypting Connections with TLS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.5" data-path="../developer/receiving/intro.html">
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<a href="../developer/receiving/intro.html">
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Receiving Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.5.1" data-path="../developer/receiving/sync.html">
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<a href="../developer/receiving/sync.html">
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Synchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.2" data-path="../developer/receiving/async.html">
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<a href="../developer/receiving/async.html">
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Asynchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.3" data-path="../developer/receiving/unsubscribing.html">
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<a href="../developer/receiving/unsubscribing.html">
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Unsubscribing
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</a>
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</li>
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<li class="chapter " data-level="3.5.4" data-path="../developer/receiving/unsub_after.html">
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<a href="../developer/receiving/unsub_after.html">
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Unsubscribing After N Messages
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</a>
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</li>
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<li class="chapter " data-level="3.5.5" data-path="../developer/receiving/reply.html">
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<a href="../developer/receiving/reply.html">
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Replying to a Message
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</a>
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</li>
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<li class="chapter " data-level="3.5.6" data-path="../developer/receiving/wildcards.html">
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<a href="../developer/receiving/wildcards.html">
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Wildcard Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.7" data-path="../developer/receiving/queues.html">
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<a href="../developer/receiving/queues.html">
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Queue Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.8" data-path="../developer/receiving/drain.html">
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<a href="../developer/receiving/drain.html">
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Draining Messages Before Disconnect
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</a>
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</li>
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<li class="chapter " data-level="3.5.9" data-path="../developer/receiving/structure.html">
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<a href="../developer/receiving/structure.html">
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Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.6" data-path="../developer/sending/intro.html">
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<a href="../developer/sending/intro.html">
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Sending Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.6.1" data-path="../developer/sending/replyto.html">
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<a href="../developer/sending/replyto.html">
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Including a Reply Subject
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</a>
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</li>
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<li class="chapter " data-level="3.6.2" data-path="../developer/sending/request_reply.html">
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<a href="../developer/sending/request_reply.html">
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Request-Reply Semantics
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</a>
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</li>
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<li class="chapter " data-level="3.6.3" data-path="../developer/sending/caches.html">
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<a href="../developer/sending/caches.html">
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Caches, Flush and Ping
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</a>
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</li>
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<li class="chapter " data-level="3.6.4" data-path="../developer/sending/structure.html">
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<a href="../developer/sending/structure.html">
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Sending Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.7" data-path="../developer/events/intro.html">
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<a href="../developer/events/intro.html">
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Monitoring the Connection
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.7.1" data-path="../developer/events/events.html">
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<a href="../developer/events/events.html">
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Listen for Connection Events
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</a>
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</li>
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<li class="chapter " data-level="3.7.2" data-path="../developer/events/slow.html">
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<a href="../developer/events/slow.html">
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Slow Consumers
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.8" data-path="../developer/tutorials/intro.html">
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<a href="../developer/tutorials/intro.html">
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Tutorials
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.8.1" data-path="../developer/tutorials/pubsub.html">
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<a href="../developer/tutorials/pubsub.html">
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Explore NATS Pub/Sub
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</a>
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</li>
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<li class="chapter " data-level="3.8.2" data-path="../developer/tutorials/reqreply.html">
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<a href="../developer/tutorials/reqreply.html">
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Explore NATS Request/Reply
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</a>
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</li>
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<li class="chapter " data-level="3.8.3" data-path="../developer/tutorials/queues.html">
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<a href="../developer/tutorials/queues.html">
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Explore NATS Queueing
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</a>
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</li>
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<li class="chapter " data-level="3.8.4" data-path="../developer/tutorials/custom_dialer.html">
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<a href="../developer/tutorials/custom_dialer.html">
|
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Advanced Connect and Custom Dialer in Go
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</a>
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</li>
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</ul>
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</li>
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<li class="header">NATS Server</li>
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<li class="chapter " data-level="4.1" data-path="installation.html">
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<a href="installation.html">
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|
Installing
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</a>
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</li>
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<li class="chapter " data-level="4.2" data-path="running.html">
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<a href="running.html">
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Running
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</a>
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<ul class="articles">
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<li class="chapter " data-level="4.2.1" data-path="windows_srv.html">
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|
<a href="windows_srv.html">
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Window Service
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="4.3" data-path="clients.html">
|
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|
<a href="clients.html">
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|
Clients
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</a>
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</li>
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<li class="chapter " data-level="4.4" data-path="flags.html">
|
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|
<a href="flags.html">
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|
Flags
|
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</a>
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</li>
|
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|
<li class="chapter " data-level="4.5" data-path="configuration.html">
|
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|
<a href="configuration.html">
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|
Configuration
|
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</a>
|
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<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1" data-path="securing_nats.html">
|
|
|
|
<a href="securing_nats.html">
|
|
|
|
|
|
Securing NATS
|
|
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|
</a>
|
|
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<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1.1" data-path="tls.html">
|
|
|
|
<a href="tls.html">
|
|
|
|
|
|
Enabling TLS
|
|
|
|
</a>
|
|
|
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|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2" data-path="auth_intro.html">
|
|
|
|
<a href="auth_intro.html">
|
|
|
|
|
|
Authentication
|
|
|
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</a>
|
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<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1.2.1" data-path="tokens.html">
|
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|
<a href="tokens.html">
|
|
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|
|
Tokens
|
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|
</a>
|
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</li>
|
|
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|
<li class="chapter " data-level="4.5.1.2.2" data-path="username_password.html">
|
|
|
|
<a href="username_password.html">
|
|
|
|
|
|
Username/Password
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.3" data-path="tls_mutual_auth.html">
|
|
|
|
<a href="tls_mutual_auth.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.4" data-path="nkey_auth.html">
|
|
|
|
<a href="nkey_auth.html">
|
|
|
|
|
|
NKeys
|
|
|
|
</a>
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.5" data-path="accounts.html">
|
|
|
|
<a href="accounts.html">
|
|
|
|
|
|
Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.6" data-path="jwt_auth.html">
|
|
|
|
<a href="jwt_auth.html">
|
|
|
|
|
|
JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.7" data-path="auth_timeout.html">
|
|
|
|
<a href="auth_timeout.html">
|
|
|
|
|
|
Authentication Timeout
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.3" data-path="authorization.html">
|
|
|
|
<a href="authorization.html">
|
|
|
|
|
|
Authorization
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2" data-path="clustering.html">
|
|
|
|
<a href="clustering.html">
|
|
|
|
|
|
Clustering
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.2.1" data-path="cluster_config.html">
|
|
|
|
<a href="cluster_config.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2.2" data-path="cluster_tls.html">
|
|
|
|
<a href="cluster_tls.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.3" data-path="../gateways/">
|
|
|
|
<a href="../gateways/">
|
|
|
|
|
|
Gateways
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.3.1" data-path="../gateways/gateway.html">
|
|
|
|
<a href="../gateways/gateway.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.4" data-path="../leafnodes/">
|
|
|
|
<a href="../leafnodes/">
|
|
|
|
|
|
Leaf Nodes
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.4.1" data-path="../leafnodes/leafnode_conf.html">
|
|
|
|
<a href="../leafnodes/leafnode_conf.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter active" data-level="4.5.5" data-path="logging.html">
|
|
|
|
<a href="logging.html">
|
|
|
|
|
|
Logging
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.6" data-path="monitoring.html">
|
|
|
|
<a href="monitoring.html">
|
|
|
|
|
|
Monitoring
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6" data-path="../nats_admin/">
|
|
|
|
<a href="../nats_admin/">
|
|
|
|
|
|
Managing A NATS Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.1" data-path="../nats_admin/upgrading_cluster.html">
|
|
|
|
<a href="../nats_admin/upgrading_cluster.html">
|
|
|
|
|
|
Upgrading a Cluster
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.2" data-path="../nats_admin/slow_consumers.html">
|
|
|
|
<a href="../nats_admin/slow_consumers.html">
|
|
|
|
|
|
Slow Consumers
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.3" data-path="../nats_admin/signals.html">
|
|
|
|
<a href="../nats_admin/signals.html">
|
|
|
|
|
|
Signals
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.4" data-path="../sys_accounts/">
|
|
|
|
<a href="../sys_accounts/">
|
|
|
|
|
|
System Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.4.1" data-path="../sys_accounts/sys_accounts.html">
|
|
|
|
<a href="../sys_accounts/sys_accounts.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7" data-path="../nats_docker/">
|
|
|
|
<a href="../nats_docker/">
|
|
|
|
|
|
NATS and Docker
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.7.1" data-path="../nats_docker/tutorial.html">
|
|
|
|
<a href="../nats_docker/tutorial.html">
|
|
|
|
|
|
Tutorial
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7.2" data-path="../nats_docker/docker_swarm.html">
|
|
|
|
<a href="../nats_docker/docker_swarm.html">
|
|
|
|
|
|
Docker Swarm
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li class="header">NATS Tools</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="5.1" data-path="../nats_tools/mkpasswd.html">
|
|
|
|
<a href="../nats_tools/mkpasswd.html">
|
|
|
|
|
|
mkpasswd
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2" data-path="../nats_tools/nk.html">
|
|
|
|
<a href="../nats_tools/nk.html">
|
|
|
|
|
|
nk
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3" data-path="../nats_tools/nsc/">
|
|
|
|
<a href="../nats_tools/nsc/">
|
|
|
|
|
|
nsc
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.3.1" data-path="../nats_tools/nsc/nsc.html">
|
|
|
|
<a href="../nats_tools/nsc/nsc.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.2" data-path="../nats_tools/nsc/streams.html">
|
|
|
|
<a href="../nats_tools/nsc/streams.html">
|
|
|
|
|
|
Streams
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.3" data-path="../nats_tools/nsc/services.html">
|
|
|
|
<a href="../nats_tools/nsc/services.html">
|
|
|
|
|
|
Services
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.4" data-path="../nats_tools/nsc/signing_keys.html">
|
|
|
|
<a href="../nats_tools/nsc/signing_keys.html">
|
|
|
|
|
|
Signing Keys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4" data-path="../nats_tools/nas/">
|
|
|
|
<a href="../nats_tools/nas/">
|
|
|
|
|
|
nats-account-server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.4.1" data-path="../nats_tools/nas/nas_conf.html">
|
|
|
|
<a href="../nats_tools/nas/nas_conf.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.2" data-path="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
<a href="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
|
|
Inspecting JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.3" data-path="../nats_tools/nas/dir_store.html">
|
|
|
|
<a href="../nats_tools/nas/dir_store.html">
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Directory Store
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</a>
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</li>
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<li class="chapter " data-level="5.4.4" data-path="../nats_tools/nas/mem_resolver.html">
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<a href="../nats_tools/nas/mem_resolver.html">
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Memory Resolver
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.5" data-path="../nats_tools/nats_top/">
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<a href="../nats_tools/nats_top/">
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nats-top
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</a>
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<ul class="articles">
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<li class="chapter " data-level="5.5.1" data-path="../nats_tools/nats_top/tutorial.html">
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<a href="../nats_tools/nats_top/tutorial.html">
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Tutorial
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.6" data-path="../nats_tools/natsbench.html">
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<a href="../nats_tools/natsbench.html">
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nats-bench
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</a>
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</li>
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<li class="header">NATS Streaming Concepts</li>
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<li class="chapter " data-level="6.1" data-path="../nats_streaming/intro.html">
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<a href="../nats_streaming/intro.html">
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Introduction
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.1.1" data-path="../nats_streaming/relation-to-nats.html">
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<a href="../nats_streaming/relation-to-nats.html">
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Relation to NATS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.2" data-path="../nats_streaming/client-connections.html">
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<a href="../nats_streaming/client-connections.html">
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Client Connections
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</a>
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</li>
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<li class="chapter " data-level="6.3" data-path="../nats_streaming/channels/channels.html">
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<a href="../nats_streaming/channels/channels.html">
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Channels
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.3.1" data-path="../nats_streaming/channels/message-log.html">
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<a href="../nats_streaming/channels/message-log.html">
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Message Log
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</a>
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</li>
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<li class="chapter " data-level="6.3.2" data-path="../nats_streaming/channels/subscriptions/subscriptions.html">
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<a href="../nats_streaming/channels/subscriptions/subscriptions.html">
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Subscriptions
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.3.2.1" data-path="../nats_streaming/channels/subscriptions/regular.html">
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<a href="../nats_streaming/channels/subscriptions/regular.html">
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Regular
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.2" data-path="../nats_streaming/channels/subscriptions/durable.html">
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<a href="../nats_streaming/channels/subscriptions/durable.html">
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Durable
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.3" data-path="../nats_streaming/channels/subscriptions/queue-group.html">
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<a href="../nats_streaming/channels/subscriptions/queue-group.html">
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Queue Group
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.4" data-path="../nats_streaming/channels/subscriptions/redelivery.html">
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<a href="../nats_streaming/channels/subscriptions/redelivery.html">
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Redelivery
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</a>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.4" data-path="../nats_streaming/store-interface.html">
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<a href="../nats_streaming/store-interface.html">
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Store Interface
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</a>
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</li>
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<li class="chapter " data-level="6.5" data-path="../nats_streaming/store-encryption.html">
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<a href="../nats_streaming/store-encryption.html">
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Store Encryption
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</a>
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</li>
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<li class="chapter " data-level="6.6" data-path="../nats_streaming/clustering/clustering.html">
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<a href="../nats_streaming/clustering/clustering.html">
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Clustering
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.6.1" data-path="../nats_streaming/clustering/supported-stores.html">
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<a href="../nats_streaming/clustering/supported-stores.html">
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Supported Stores
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</a>
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</li>
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<li class="chapter " data-level="6.6.2" data-path="../nats_streaming/clustering/configuration.html">
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<a href="../nats_streaming/clustering/configuration.html">
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Configuration
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</a>
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</li>
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<li class="chapter " data-level="6.6.3" data-path="../nats_streaming/clustering/auto-configuration.html">
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<a href="../nats_streaming/clustering/auto-configuration.html">
|
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Auto Configuration
|
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</a>
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</li>
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<li class="chapter " data-level="6.6.4" data-path="../nats_streaming/clustering/containers.html">
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<a href="../nats_streaming/clustering/containers.html">
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Containers
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.7" data-path="../nats_streaming/fault-tolerance/ft.html">
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<a href="../nats_streaming/fault-tolerance/ft.html">
|
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Fault Tolerance
|
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.7.1" data-path="../nats_streaming/fault-tolerance/active-server.html">
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<a href="../nats_streaming/fault-tolerance/active-server.html">
|
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Active Server
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</a>
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</li>
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<li class="chapter " data-level="6.7.2" data-path="../nats_streaming/fault-tolerance/standby-server.html">
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<a href="../nats_streaming/fault-tolerance/standby-server.html">
|
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Standby Servers
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</a>
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</li>
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<li class="chapter " data-level="6.7.3" data-path="../nats_streaming/fault-tolerance/shared-state.html">
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<a href="../nats_streaming/fault-tolerance/shared-state.html">
|
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Shared State
|
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</a>
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</li>
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<li class="chapter " data-level="6.7.4" data-path="../nats_streaming/fault-tolerance/failover.html">
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<a href="../nats_streaming/fault-tolerance/failover.html">
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Failover
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.8" data-path="../nats_streaming/partitioning.html">
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<a href="../nats_streaming/partitioning.html">
|
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Partitioning
|
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</a>
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</li>
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<li class="header">Developing With NATS Streaming</li>
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<li class="chapter " data-level="7.1" data-path="../developer/streaming/">
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<a href="../developer/streaming/">
|
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Introduction
|
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</a>
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</li>
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<li class="chapter " data-level="7.2" data-path="../developer/streaming/connecting.html">
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<a href="../developer/streaming/connecting.html">
|
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|
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Connecting to NATS Streaming
|
|
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</a>
|
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</li>
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<li class="chapter " data-level="7.3" data-path="../developer/streaming/publishing.html">
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<a href="../developer/streaming/publishing.html">
|
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|
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Publishing to a Channel
|
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</a>
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</li>
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<li class="chapter " data-level="7.4" data-path="../developer/streaming/receiving.html">
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<a href="../developer/streaming/receiving.html">
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|
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Receiving Messages from a Channel
|
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</a>
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</li>
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<li class="chapter " data-level="7.5" data-path="../developer/streaming/durables.html">
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<a href="../developer/streaming/durables.html">
|
|
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Durable Subscriptions
|
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</a>
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</li>
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<li class="chapter " data-level="7.6" data-path="../developer/streaming/queues.html">
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<a href="../developer/streaming/queues.html">
|
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|
|
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Queue Subscriptions
|
|
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</a>
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</li>
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<li class="chapter " data-level="7.7" data-path="../developer/streaming/acks.html">
|
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<a href="../developer/streaming/acks.html">
|
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|
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|
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Acknowledgements
|
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</a>
|
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</li>
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<li class="chapter " data-level="7.8" data-path="../developer/streaming/protocol.html">
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<a href="../developer/streaming/protocol.html">
|
|
|
|
|
|
The Streaming Protocol
|
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</a>
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</li>
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<li class="header">NATS Streaming Server</li>
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<li class="chapter " data-level="8.1" data-path="../nats_streaming/gettingstarted/install.html">
|
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<a href="../nats_streaming/gettingstarted/install.html">
|
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|
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Installing
|
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</a>
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</li>
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<li class="chapter " data-level="8.2" data-path="../nats_streaming/gettingstarted/run.html">
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<a href="../nats_streaming/gettingstarted/run.html">
|
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Running
|
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</a>
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</li>
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<li class="chapter " data-level="8.3" data-path="../nats_streaming/gettingstarted/configuring.html">
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<a href="../nats_streaming/gettingstarted/configuring.html">
|
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|
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Configuring
|
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</a>
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</li>
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<li class="chapter " data-level="8.4" data-path="../nats_streaming/gettingstarted/tls.html">
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<a href="../nats_streaming/gettingstarted/tls.html">
|
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|
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Securing
|
|
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</a>
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</li>
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|
<li class="chapter " data-level="8.5" data-path="../nats_streaming/gettingstarted/process-signaling.html">
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<a href="../nats_streaming/gettingstarted/process-signaling.html">
|
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|
|
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Process Signaling
|
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</a>
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</li>
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<li class="chapter " data-level="8.6" data-path="../nats_streaming/gettingstarted/windows-service.html">
|
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|
|
<a href="../nats_streaming/gettingstarted/windows-service.html">
|
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|
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Windows Service
|
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</a>
|
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</li>
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<li class="chapter " data-level="8.7" data-path="../developer/streaming/embedding.html">
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<a href="../developer/streaming/embedding.html">
|
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|
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Embedding NATS Streaming Server
|
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</a>
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</li>
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<li class="chapter " data-level="8.8" data-path="../nats_streaming/swarm.html">
|
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|
|
<a href="../nats_streaming/swarm.html">
|
|
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|
|
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Docker Swarm
|
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</a>
|
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</li>
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<li class="chapter " data-level="8.9" data-path="../nats_streaming/monitoring/monitoring.html">
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|
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<a href="../nats_streaming/monitoring/monitoring.html">
|
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|
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|
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Monitoring
|
|
|
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</a>
|
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<ul class="articles">
|
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<li class="chapter " data-level="8.9.1" data-path="../nats_streaming/monitoring/enabling.html">
|
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|
|
<a href="../nats_streaming/monitoring/enabling.html">
|
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|
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Enabling
|
|
|
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</a>
|
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</li>
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<li class="chapter " data-level="8.9.2" data-path="../nats_streaming/monitoring/endpoints.html">
|
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|
<a href="../nats_streaming/monitoring/endpoints.html">
|
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Endpoints
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</a>
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</li>
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</ul>
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</li>
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<li class="header">NATS Protocol</li>
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|
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<li class="chapter " data-level="9.1" data-path="../nats_protocol/nats-protocol-demo.html">
|
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|
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<a href="../nats_protocol/nats-protocol-demo.html">
|
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Protocol Demo
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</a>
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</li>
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<li class="chapter " data-level="9.2" data-path="../nats_protocol/nats-protocol.html">
|
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<a href="../nats_protocol/nats-protocol.html">
|
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|
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|
Client Protocol
|
|
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</a>
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<ul class="articles">
|
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<li class="chapter " data-level="9.2.1" data-path="../nats_protocol/nats-client-dev.html">
|
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<a href="../nats_protocol/nats-client-dev.html">
|
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Developing a Client
|
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="9.3" data-path="../nats_protocol/nats-server-protocol.html">
|
|
|
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<a href="../nats_protocol/nats-server-protocol.html">
|
|
|
|
|
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NATS Cluster Protocol
|
|
|
|
</a>
|
|
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</li>
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<li class="divider"></li>
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<li>
|
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
|
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Published with GitBook
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</a>
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</li>
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</ul>
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<div class="book-header" role="navigation">
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<!-- Title -->
|
|
<h1>
|
|
<i class="fa fa-circle-o-notch fa-spin"></i>
|
|
<a href=".." >Logging</a>
|
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</h1>
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</div>
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<div class="page-wrapper" tabindex="-1" role="main">
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<div class="page-inner">
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<div class="search-noresults">
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<section class="normal markdown-section">
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<h2 id="configuring-logging"><a name="configuring-logging" class="plugin-anchor" href="#configuring-logging"><i class="fa fa-link" aria-hidden="true"></i></a>Configuring Logging</h2>
|
|
<p>The NATS server provides various logging options that you can set via the command line or the configuration file.</p>
|
|
<h3 id="command-line-options"><a name="command-line-options" class="plugin-anchor" href="#command-line-options"><i class="fa fa-link" aria-hidden="true"></i></a>Command Line Options</h3>
|
|
<p>The following logging operations are supported:</p>
|
|
<pre class="language-"><code>-l, --log FILE File to redirect log output.
|
|
-T, --logtime Timestamp log entries (default is true).
|
|
-s, --syslog Enable syslog as log method.
|
|
-r, --remote_syslog Syslog server address.
|
|
-D, --debug Enable debugging output.
|
|
-V, --trace Trace the raw protocol.
|
|
-DV Debug and Trace.
|
|
</code></pre><h4 id="debug-and-trace"><a name="debug-and-trace" class="plugin-anchor" href="#debug-and-trace"><i class="fa fa-link" aria-hidden="true"></i></a>Debug and trace</h4>
|
|
<p>The <code>-DV</code> flag enables trace and debug for the server.</p>
|
|
<pre class="language-"><code class="lang-sh">nats-server -DV -m 8222 -user foo -pass bar
|
|
</code></pre>
|
|
<h4 id="log-file-redirect"><a name="log-file-redirect" class="plugin-anchor" href="#log-file-redirect"><i class="fa fa-link" aria-hidden="true"></i></a>Log file redirect</h4>
|
|
<pre class="language-"><code class="lang-sh">nats-server -DV -m 8222 -l nats.log
|
|
</code></pre>
|
|
<h4 id="timestamp"><a name="timestamp" class="plugin-anchor" href="#timestamp"><i class="fa fa-link" aria-hidden="true"></i></a>Timestamp</h4>
|
|
<p>If <code>-T false</code> then log entries are not timestamped. Default is true.</p>
|
|
<h4 id="syslog"><a name="syslog" class="plugin-anchor" href="#syslog"><i class="fa fa-link" aria-hidden="true"></i></a>Syslog</h4>
|
|
<p>You can configure syslog with <code>UDP</code>:</p>
|
|
<pre class="language-"><code class="lang-sh">nats-server -s udp://localhost:514
|
|
</code></pre>
|
|
<p>or <code>syslog:</code></p>
|
|
<pre class="language-"><code class="lang-sh">nats-server -r syslog://<span class="token operator"><</span>hostname<span class="token operator">></span>:<span class="token operator"><</span>port<span class="token operator">></span>
|
|
</code></pre>
|
|
<p>For example:</p>
|
|
<pre class="language-"><code class="lang-sh">syslog://logs.papertrailapp.com:26900
|
|
</code></pre>
|
|
<h3 id="using-the-configuration-file"><a name="using-the-configuration-file" class="plugin-anchor" href="#using-the-configuration-file"><i class="fa fa-link" aria-hidden="true"></i></a>Using the Configuration File</h3>
|
|
<p>All of these settings are available in the configuration file as well.</p>
|
|
<pre class="language-"><code class="lang-ascii">debug: false
|
|
trace: true
|
|
logtime: false
|
|
log_file: "/tmp/nats-server.log"
|
|
</code></pre>
|
|
<h3 id="log-rotation-with-logrotate"><a name="log-rotation-with-logrotate" class="plugin-anchor" href="#log-rotation-with-logrotate"><i class="fa fa-link" aria-hidden="true"></i></a>Log Rotation with logrotate</h3>
|
|
<p>NATS server does not provide tools to manage log files, but it does include mechanisms that make log rotation simple. We can use this mechanism with <a href="https://github.com/logrotate/logrotate" target="_blank">logrotate</a>; a simple standard Linux utility to rotate logs available on most distributions like Debian, Ubuntu, RedHat (CentOS), etc.</p>
|
|
<p>For example, you could configure <code>logrotate</code> with:</p>
|
|
<pre class="language-"><code class="lang-ascii">/path/to/nats-server.log {
|
|
daily
|
|
rotate 30
|
|
compress
|
|
missingok
|
|
notifempty
|
|
postrotate
|
|
kill -SIGUSR1 `cat /var/run/nats-server.pid`
|
|
endscript
|
|
}
|
|
</code></pre>
|
|
<p>The first line specifies the location that the subsequent lines will apply to.</p>
|
|
<p>The rest of the file specifies that the logs will rotate daily ("daily" option) and that 30 older copies will be preserved ("rotate" option). Other options are described in <a href="https://linux.die.net/man/8/logrotate" target="_blank">logrorate documentation</a>.</p>
|
|
<p>The "postrotate" section tells NATS server to reload the log files once the rotation is complete. The command <code>kill -SIGUSR1 `cat /var/run/nats-server.pid` </code> does not kill the NATS server process, but instead sends it a signal causing it to reload its log files. This will cause new requests to be logged to the refreshed log file.</p>
|
|
<p>The <code>/var/run/nats-server.pid</code> file is where NATS server stores the master process's pid.</p>
|
|
<h2 id="some-logging-notes"><a name="some-logging-notes" class="plugin-anchor" href="#some-logging-notes"><i class="fa fa-link" aria-hidden="true"></i></a>Some Logging Notes</h2>
|
|
<ul>
|
|
<li>The NATS server, in verbose mode, will log the receipt of <code>UNSUB</code> messages, but this does not indicate the subscription is gone, only that the message was received. The <code>DELSUB</code> message in the log can be used to determine when the actual subscription removal has taken place.</li>
|
|
</ul>
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function pageChanged() {
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var logos = document.querySelectorAll(".nats");
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if (logos && logos.length == 0) {
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gitbook.toolbar.createButton({
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position: 'right',
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onClick: function () {
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var win = window.open("https://nats.io/", '_blank');
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|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(8)~.tab__content:nth-of-type(8) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:first-of-type:not(:last-of-type)+label {
|
|
border-top-right-radius: 0;
|
|
border-bottom-right-radius: 0;
|
|
}
|
|
|
|
.tab:not(:first-of-type):not(:last-of-type)+label {
|
|
border-radius: 0;
|
|
}
|
|
|
|
.tab:last-of-type:not(:first-of-type)+label {
|
|
border-top-left-radius: 0;
|
|
border-bottom-left-radius: 0;
|
|
}
|
|
|
|
.tab:checked+label {
|
|
background-color: #fff;
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
cursor: default;
|
|
font-weight: bold;
|
|
border: 1px solid #ddd;
|
|
border-bottom-color: transparent;
|
|
}
|
|
|
|
.tab:checked+label:hover {
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
background-color: #fff;
|
|
}
|
|
|
|
.tab+label {
|
|
box-shadow: 0 -1px 0 #eee inset;
|
|
border-radius: 6px 6px 0 0;
|
|
cursor: pointer;
|
|
display: block;
|
|
text-decoration: none;
|
|
color: #27aae1;
|
|
flex-grow: 3;
|
|
text-align: center;
|
|
-webkit-user-select: none;
|
|
-moz-user-select: none;
|
|
-ms-user-select: none;
|
|
user-select: none;
|
|
text-align: center;
|
|
transition: 0.3s background-color ease, 0.3s box-shadow ease;
|
|
height: 50px;
|
|
box-sizing: border-box;
|
|
padding: 15px;
|
|
}
|
|
|
|
.tab+label:hover {
|
|
background-color: #f9f9f9;
|
|
box-shadow: 0 1px 0 #f4f4f4 inset;
|
|
}
|
|
|
|
.tab__content {
|
|
padding: 2px 2px;
|
|
background-color: transparent;
|
|
position: absolute;
|
|
width: 100%;
|
|
z-index: -1;
|
|
opacity: 0;
|
|
left: 0;
|
|
-webkit-transform: translateY(-3px);
|
|
transform: translateY(-3px);
|
|
border-radius: 6px;
|
|
}
|
|
|
|
.tab__content pre {
|
|
margin-bottom: 0px !important;
|
|
}
|
|
|
|
.toolbar-icons {
|
|
display: inline-block;
|
|
position: relative;
|
|
padding-left: 4px;
|
|
}
|
|
|
|
a.toolbar-icons {
|
|
text-decoration: none;
|
|
}
|
|
|
|
.toolbar-icons .mdi {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.copy-msg {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.pull-right {
|
|
float: right !important;
|
|
}
|
|
|
|
.pull-left {
|
|
float: left !important;
|
|
}
|
|
</style>
|
|
|
|
|
|
<script src="../gitbook/gitbook.js"></script>
|
|
<script src="../gitbook/theme.js"></script>
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-toggle-chapters/toggle.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-search/search-engine.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-search/search.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|