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74 KiB
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<title>Clustering ยท NATS</title>
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<li class="chapter " data-level="1.1" data-path="../">
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Introduction
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What's New in 2.0
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Installing
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Running
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Window Service
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Clients
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Flags
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Configuration
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<a href="securing_nats.html">
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Securing NATS
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<ul class="articles">
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<a href="tls.html">
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Enabling TLS
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</a>
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Authentication
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Tokens
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Username/Password
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TLS Authentication
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NKeys
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Accounts
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Authentication Timeout
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Authorization
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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="2.5.2.1" data-path="cluster_config.html">
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<a href="cluster_config.html">
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Configuration
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<li class="chapter " data-level="2.5.2.2" data-path="cluster_tls.html">
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<a href="cluster_tls.html">
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TLS Authentication
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</a>
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<li class="chapter " data-level="2.5.3" data-path="../gateways/">
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<a href="../gateways/">
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Gateways
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<ul class="articles">
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<li class="chapter " data-level="2.5.3.1" data-path="../gateways/gateway.html">
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<a href="../gateways/gateway.html">
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Configuration
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</a>
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<li class="chapter " data-level="2.5.4" data-path="../leafnodes/">
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<a href="../leafnodes/">
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Leaf Nodes
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<a href="../leafnodes/leafnode_conf.html">
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Configuration
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<a href="logging.html">
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Logging
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<a href="monitoring.html">
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Monitoring
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</a>
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</ul>
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<li class="chapter " data-level="2.6" data-path="../nats_admin/">
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<a href="../nats_admin/">
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Managing A NATS Server
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</a>
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<ul class="articles">
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<li class="chapter " data-level="2.6.1" data-path="../nats_admin/upgrading_cluster.html">
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<a href="../nats_admin/upgrading_cluster.html">
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Upgrading a Cluster
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</a>
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</li>
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<li class="chapter " data-level="2.6.2" data-path="../nats_admin/slow_consumers.html">
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<a href="../nats_admin/slow_consumers.html">
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Slow Consumers
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</a>
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</li>
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<li class="chapter " data-level="2.6.3" data-path="../nats_admin/signals.html">
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<a href="../nats_admin/signals.html">
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Signals
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</a>
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</li>
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<li class="chapter " data-level="2.6.4" data-path="../sys_accounts/">
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<a href="../sys_accounts/">
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System Accounts
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</a>
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<ul class="articles">
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<li class="chapter " data-level="2.6.4.1" data-path="../sys_accounts/sys_accounts.html">
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<a href="../sys_accounts/sys_accounts.html">
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Configuration
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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="2.7" data-path="../nats_docker/">
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<a href="../nats_docker/">
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NATS and Docker
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</a>
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<ul class="articles">
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<li class="chapter " data-level="2.7.1" data-path="../nats_docker/tutorial.html">
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<a href="../nats_docker/tutorial.html">
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Tutorial
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</a>
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</li>
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<li class="chapter " data-level="2.7.2" data-path="../nats_docker/docker_swarm.html">
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<a href="../nats_docker/docker_swarm.html">
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Docker Swarm
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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 Streaming Server</li>
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<li class="chapter " data-level="3.1" data-path="../nats_streaming/nats-streaming-intro.html">
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<a href="../nats_streaming/nats-streaming-intro.html">
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Basics
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</a>
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</li>
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<li class="chapter " data-level="3.2" data-path="../nats_streaming/nats-streaming-install.html">
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<a href="../nats_streaming/nats-streaming-install.html">
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Installing
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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="../nats_streaming/nats-streaming-tls.html">
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<a href="../nats_streaming/nats-streaming-tls.html">
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Securing
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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="../nats_streaming/nats-streaming-protocol.html">
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<a href="../nats_streaming/nats-streaming-protocol.html">
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Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.4" data-path="../nats_streaming/nats-streaming-swarm.html">
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<a href="../nats_streaming/nats-streaming-swarm.html">
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Docker Swarm
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</a>
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</li>
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<li class="header">NATS Tools</li>
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<li class="chapter " data-level="4.1" data-path="../nats_tools/mkpasswd.html">
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<a href="../nats_tools/mkpasswd.html">
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mkpasswd
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</a>
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</li>
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<li class="chapter " data-level="4.2" data-path="../nats_tools/nk.html">
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<a href="../nats_tools/nk.html">
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nk
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</a>
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</li>
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<li class="chapter " data-level="4.3" data-path="../nats_tools/nsc/">
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<a href="../nats_tools/nsc/">
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nsc
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</a>
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<ul class="articles">
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<li class="chapter " data-level="4.3.1" data-path="../nats_tools/nsc/nsc.html">
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<a href="../nats_tools/nsc/nsc.html">
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Basics
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</a>
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</li>
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<li class="chapter " data-level="4.3.2" data-path="../nats_tools/nsc/streams.html">
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<a href="../nats_tools/nsc/streams.html">
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Streams
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</a>
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</li>
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|
<li class="chapter " data-level="4.3.3" data-path="../nats_tools/nsc/services.html">
|
|
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<a href="../nats_tools/nsc/services.html">
|
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|
Services
|
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</a>
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</li>
|
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<li class="chapter " data-level="4.3.4" data-path="../nats_tools/nsc/signing_keys.html">
|
|
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|
<a href="../nats_tools/nsc/signing_keys.html">
|
|
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|
|
Signing Keys
|
|
|
|
</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="4.4" data-path="../nats_tools/nas/">
|
|
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|
<a href="../nats_tools/nas/">
|
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|
|
|
nats-account-server
|
|
|
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</a>
|
|
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|
<ul class="articles">
|
|
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|
|
<li class="chapter " data-level="4.4.1" data-path="../nats_tools/nas/nas_conf.html">
|
|
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|
<a href="../nats_tools/nas/nas_conf.html">
|
|
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|
|
|
Basics
|
|
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|
</a>
|
|
|
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</li>
|
|
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|
<li class="chapter " data-level="4.4.2" data-path="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
<a href="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
|
|
Inspecting JWTs
|
|
|
|
</a>
|
|
|
|
|
|
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|
</li>
|
|
|
|
<li class="chapter " data-level="4.4.3" data-path="../nats_tools/nas/mem_resolver.html">
|
|
|
|
<a href="../nats_tools/nas/mem_resolver.html">
|
|
|
|
|
|
Memory Resolver
|
|
|
|
</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="4.5" 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">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.1" data-path="../nats_tools/nats_top/tutorial.html">
|
|
|
|
<a href="../nats_tools/nats_top/tutorial.html">
|
|
|
|
|
|
Tutorial
|
|
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</a>
|
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</li>
|
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</ul>
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.6" data-path="../nats_tools/natsbench.html">
|
|
|
|
<a href="../nats_tools/natsbench.html">
|
|
|
|
|
|
nats-bench
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
|
|
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|
|
|
<li class="header">Developing With NATS</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="5.1" data-path="../developer/">
|
|
|
|
<a href="../developer/">
|
|
|
|
|
|
Introduction
|
|
|
|
</a>
|
|
|
|
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|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2" data-path="../developer/concepts/intro.html">
|
|
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|
<a href="../developer/concepts/intro.html">
|
|
|
|
|
|
Concepts
|
|
|
|
</a>
|
|
|
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|
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|
|
<ul class="articles">
|
|
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|
|
|
<li class="chapter " data-level="5.2.1" data-path="../developer/concepts/subjects.html">
|
|
|
|
<a href="../developer/concepts/subjects.html">
|
|
|
|
|
|
Subject-Based Messaging
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2.2" data-path="../developer/concepts/pubsub.html">
|
|
|
|
<a href="../developer/concepts/pubsub.html">
|
|
|
|
|
|
Publish-Subscribe
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2.3" data-path="../developer/concepts/reqreply.html">
|
|
|
|
<a href="../developer/concepts/reqreply.html">
|
|
|
|
|
|
Request-Reply
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2.4" data-path="../developer/concepts/queue.html">
|
|
|
|
<a href="../developer/concepts/queue.html">
|
|
|
|
|
|
Queue Groups
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2.5" data-path="../developer/concepts/acks.html">
|
|
|
|
<a href="../developer/concepts/acks.html">
|
|
|
|
|
|
Acknowledgements
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2.6" data-path="../developer/concepts/seq_num.html">
|
|
|
|
<a href="../developer/concepts/seq_num.html">
|
|
|
|
|
|
Sequence Numbers
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3" data-path="../developer/connecting/intro.html">
|
|
|
|
<a href="../developer/connecting/intro.html">
|
|
|
|
|
|
Connecting
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.3.1" data-path="../developer/connecting/default_server.html">
|
|
|
|
<a href="../developer/connecting/default_server.html">
|
|
|
|
|
|
Connecting to the Default Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.2" data-path="../developer/connecting/specific_server.html">
|
|
|
|
<a href="../developer/connecting/specific_server.html">
|
|
|
|
|
|
Connecting to a Specific Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.3" data-path="../developer/connecting/cluster.html">
|
|
|
|
<a href="../developer/connecting/cluster.html">
|
|
|
|
|
|
Connecting to a Cluster
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.4" data-path="../developer/connecting/connect_timeout.html">
|
|
|
|
<a href="../developer/connecting/connect_timeout.html">
|
|
|
|
|
|
Setting a Connect Timeout
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.5" data-path="../developer/connecting/pingpong.html">
|
|
|
|
<a href="../developer/connecting/pingpong.html">
|
|
|
|
|
|
Ping/Pong Protocol
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.6" data-path="../developer/connecting/protocol.html">
|
|
|
|
<a href="../developer/connecting/protocol.html">
|
|
|
|
|
|
Controlling the Client/Server Protocol
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.7" data-path="../developer/connecting/noecho.html">
|
|
|
|
<a href="../developer/connecting/noecho.html">
|
|
|
|
|
|
Turning Off Echo'd Messages
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4" data-path="../developer/reconnect/intro.html">
|
|
|
|
<a href="../developer/reconnect/intro.html">
|
|
|
|
|
|
Automatic Reconnections
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.4.1" data-path="../developer/reconnect/disable.html">
|
|
|
|
<a href="../developer/reconnect/disable.html">
|
|
|
|
|
|
Disabling Reconnect
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.2" data-path="../developer/reconnect/max.html">
|
|
|
|
<a href="../developer/reconnect/max.html">
|
|
|
|
|
|
Set the Number of Reconnect Attempts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.3" data-path="../developer/reconnect/wait.html">
|
|
|
|
<a href="../developer/reconnect/wait.html">
|
|
|
|
|
|
Pausing Between Reconnect Attempts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.4" data-path="../developer/reconnect/random.html">
|
|
|
|
<a href="../developer/reconnect/random.html">
|
|
|
|
|
|
Avoiding the Thundering Herd
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.5" data-path="../developer/reconnect/events.html">
|
|
|
|
<a href="../developer/reconnect/events.html">
|
|
|
|
|
|
Listening for Reconnect Events
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.6" data-path="../developer/reconnect/buffer.html">
|
|
|
|
<a href="../developer/reconnect/buffer.html">
|
|
|
|
|
|
Buffering Messages During Reconnect Attempts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.5" data-path="../developer/security/intro.html">
|
|
|
|
<a href="../developer/security/intro.html">
|
|
|
|
|
|
Securing Connections
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.5.1" data-path="../developer/security/userpass.html">
|
|
|
|
<a href="../developer/security/userpass.html">
|
|
|
|
|
|
Authenticating with a User and Password
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.5.2" data-path="../developer/security/token.html">
|
|
|
|
<a href="../developer/security/token.html">
|
|
|
|
|
|
Authenticating with a Token
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.5.3" data-path="../developer/security/nkey.html">
|
|
|
|
<a href="../developer/security/nkey.html">
|
|
|
|
|
|
Authenticating with an NKey
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.5.4" data-path="../developer/security/creds.html">
|
|
|
|
<a href="../developer/security/creds.html">
|
|
|
|
|
|
Authenticating with a Credentials File
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.5.5" data-path="../developer/security/tls.html">
|
|
|
|
<a href="../developer/security/tls.html">
|
|
|
|
|
|
Encrypting Connections with TLS
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6" data-path="../developer/receiving/intro.html">
|
|
|
|
<a href="../developer/receiving/intro.html">
|
|
|
|
|
|
Receiving Messages
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.6.1" data-path="../developer/receiving/sync.html">
|
|
|
|
<a href="../developer/receiving/sync.html">
|
|
|
|
|
|
Synchronous Subscriptions
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.2" data-path="../developer/receiving/async.html">
|
|
|
|
<a href="../developer/receiving/async.html">
|
|
|
|
|
|
Asynchronous Subscriptions
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.3" data-path="../developer/receiving/unsubscribing.html">
|
|
|
|
<a href="../developer/receiving/unsubscribing.html">
|
|
|
|
|
|
Unsubscribing
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.4" data-path="../developer/receiving/unsub_after.html">
|
|
|
|
<a href="../developer/receiving/unsub_after.html">
|
|
|
|
|
|
Unsubscribing After N Messages
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.5" data-path="../developer/receiving/reply.html">
|
|
|
|
<a href="../developer/receiving/reply.html">
|
|
|
|
|
|
Replying to a Message
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.6" data-path="../developer/receiving/wildcards.html">
|
|
|
|
<a href="../developer/receiving/wildcards.html">
|
|
|
|
|
|
Wildcard Subscriptions
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.7" data-path="../developer/receiving/queues.html">
|
|
|
|
<a href="../developer/receiving/queues.html">
|
|
|
|
|
|
Queue Subscriptions
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.8" data-path="../developer/receiving/drain.html">
|
|
|
|
<a href="../developer/receiving/drain.html">
|
|
|
|
|
|
Draining Messages Before Disconnect
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6.9" data-path="../developer/receiving/structure.html">
|
|
|
|
<a href="../developer/receiving/structure.html">
|
|
|
|
|
|
Structured Data
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.7" data-path="../developer/sending/intro.html">
|
|
|
|
<a href="../developer/sending/intro.html">
|
|
|
|
|
|
Sending Messages
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.7.1" data-path="../developer/sending/replyto.html">
|
|
|
|
<a href="../developer/sending/replyto.html">
|
|
|
|
|
|
Including a Reply Subject
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.7.2" data-path="../developer/sending/request_reply.html">
|
|
|
|
<a href="../developer/sending/request_reply.html">
|
|
|
|
|
|
Request-Reply Semantics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.7.3" data-path="../developer/sending/caches.html">
|
|
|
|
<a href="../developer/sending/caches.html">
|
|
|
|
|
|
Caches, Flush and Ping
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.7.4" data-path="../developer/sending/structure.html">
|
|
|
|
<a href="../developer/sending/structure.html">
|
|
|
|
|
|
Sending Structured Data
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.8" data-path="../developer/events/intro.html">
|
|
|
|
<a href="../developer/events/intro.html">
|
|
|
|
|
|
Monitoring the Connection
|
|
|
|
</a>
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<ul class="articles">
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<li class="chapter " data-level="5.8.1" 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="5.8.2" 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="5.9" 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="5.9.1" 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="5.9.2" 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="5.9.3" 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="5.9.4" 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">Developing With NATS Streaming</li>
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<li class="chapter " data-level="6.1" 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="6.2" data-path="../developer/streaming/connecting.html">
|
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<a href="../developer/streaming/connecting.html">
|
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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="6.3" data-path="../developer/streaming/publishing.html">
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<a href="../developer/streaming/publishing.html">
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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="6.4" data-path="../developer/streaming/receiving.html">
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<a href="../developer/streaming/receiving.html">
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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="6.5" 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="6.6" data-path="../developer/streaming/queues.html">
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<a href="../developer/streaming/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="6.7" data-path="../developer/streaming/acks.html">
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<a href="../developer/streaming/acks.html">
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Acknowledgements
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</a>
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</li>
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<li class="header">NATS Protocol</li>
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<li class="chapter " data-level="7.1" data-path="../nats_protocol/nats-protocol-demo.html">
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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="7.2" data-path="../nats_protocol/nats-protocol.html">
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<a href="../nats_protocol/nats-protocol.html">
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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="7.2.1" 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="7.3" data-path="../nats_protocol/nats-server-protocol.html">
|
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<a href="../nats_protocol/nats-server-protocol.html">
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|
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NATS Cluster Protocol
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</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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</nav>
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</div>
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<div class="book-body">
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<div class="body-inner">
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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>
|
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<a href=".." >Clustering</a>
|
|
</h1>
|
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</div>
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<div class="page-wrapper" tabindex="-1" role="main">
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<div id="book-search-results">
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<div class="search-noresults">
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<section class="normal markdown-section">
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|
|
<h2 id="nats-server-clustering">NATS Server Clustering</h2>
|
|
<p>NATS supports running each server in clustered mode. You can cluster servers together for high volume messaging systems and resiliency and high availability. Clients are cluster-aware.</p>
|
|
<p>Note that NATS clustered servers have a forwarding limit of one hop. This means that each <code>nats-server</code> instance will <strong>only</strong> forward messages that it has received <strong>from a client</strong> to the immediately adjacent <code>nats-server</code> instances to which it has routes. Messages received <strong>from</strong> a route will only be distributed to local clients. Therefore a full mesh cluster, or complete graph, is recommended for NATS to function as intended and as described throughout the documentation.</p>
|
|
<h2 id="cluster-urls">Cluster URLs</h2>
|
|
<p>In addition to a port for listening for clients, <code>nats-server</code> can listen on a "cluster" URL (the <code>-cluster</code> option). Additional <code>nats-server</code> servers can then add that URL to their <code>-routes</code> argument to join the cluster. These options can also be specified in a config file, but only the command-line version is shown in this overview for simplicity.</p>
|
|
<h3 id="running-with-no-cluster">Running with No Cluster</h3>
|
|
<pre class="language-"><code class="lang-sh">nats-server -p 4222
|
|
</code></pre>
|
|
<hr>
|
|
<h3 id="running-a-simple-cluster">Running a Simple Cluster</h3>
|
|
<pre class="language-"><code class="lang-sh"><span class="token comment"># Server A on 10.10.0.1</span>
|
|
nats-server -p 4222 -cluster nats://10.10.0.1:5222
|
|
|
|
<span class="token comment"># Server B on 10.10.0.2</span>
|
|
nats-server -p 4222 -cluster nats://10.10.0.2:5222 -routes nats://10.10.0.1:5222
|
|
</code></pre>
|
|
<hr>
|
|
<pre class="language-"><code class="lang-sh"><span class="token comment"># Server A on 10.10.0.1</span>
|
|
nats-server -p 4222 -cluster nats://10.10.0.1:5222 -routes nats://10.10.0.2:5222
|
|
|
|
<span class="token comment"># Server B on 10.10.0.2</span>
|
|
nats-server -p 4222 -cluster nats://10.10.0.2:5222 -routes nats://10.10.0.1:5222
|
|
</code></pre>
|
|
<p>Clients connecting to any server in the cluster will remain connected to the cluster even if the server it originally connected to is taken down, as long as at least a single server remains.</p>
|
|
<h2 id="command-line-options">Command Line Options</h2>
|
|
<p>The following cluster options are supported:</p>
|
|
<pre class="language-"><code>--routes [rurl-1, rurl-2] Routes to solicit and connect
|
|
--cluster nats://host:port Cluster URL for solicited routes
|
|
</code></pre><p>When a NATS server routes to a specified URL, it will advertise its own cluster URL to all other servers in the route route effectively creating a routing mesh to all other servers. </p>
|
|
<p><strong>Note:</strong> when using the <code>-routes</code> option, you must also specify a <code>-cluster</code> option.</p>
|
|
<p>Clustering can also be configured using the server <a href="../documentation/managing_the_server/configuration">config file</a>.</p>
|
|
<h2 id="three-server-cluster-example">Three Server Cluster Example</h2>
|
|
<p>The following example demonstrates how to run a cluster of 3 servers on the same host. We will start with the seed server and use the <code>-D</code> command line parameter to produce debug information.</p>
|
|
<pre class="language-"><code class="lang-sh">nats-server -p 4222 -cluster nats://localhost:4248 -D
|
|
</code></pre>
|
|
<p>Alternatively, you could use a configuration file, let's call it <code>seed.conf</code>, with a content similar to this:</p>
|
|
<pre class="language-"><code class="lang-ascii"># Cluster Seed Node
|
|
|
|
listen: 127.0.0.1:4222
|
|
http: 8222
|
|
|
|
cluster {
|
|
listen: 127.0.0.1:4248
|
|
}
|
|
</code></pre>
|
|
<p>And start the server like this:</p>
|
|
<pre class="language-"><code class="lang-sh">nats-server -config ./seed.conf -D
|
|
</code></pre>
|
|
<p>This will produce an output similar to:</p>
|
|
<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:14:47.339321 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Listening <span class="token keyword">for</span> route connections on 127.0.0.1:4248
|
|
<span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:14:47.340787 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Listening <span class="token keyword">for</span> client connections on 127.0.0.1:4222
|
|
<span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:14:47.340822 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> server <span class="token function">id</span> is xZfu3u7usAPWkuThomoGzM
|
|
<span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:14:47.340825 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> server is ready
|
|
</code></pre>
|
|
<p>It is also possible to specify the hostname and port independently. At least the port is required. If you leave the hostname off it will bind to all the interfaces ('0.0.0.0').</p>
|
|
<pre class="language-"><code class="lang-ascii">cluster {
|
|
host: 127.0.0.1
|
|
port: 4248
|
|
}
|
|
</code></pre>
|
|
<p>Now let's start two more servers, each one connecting to the seed server.</p>
|
|
<pre class="language-"><code class="lang-sh">nats-server -p 5222 -cluster nats://localhost:5248 -routes nats://localhost:4248 -D
|
|
</code></pre>
|
|
<p>When running on the same host, we need to pick different ports for the client connections <code>-p</code>, and for the port used to accept other routes <code>-cluster</code>. Note that <code>-routes</code> points to the <code>-cluster</code> address of the seed server (<code>localhost:4248</code>).</p>
|
|
<p>Here is the log produced. See how it connects and registers a route to the seed server (<code>...GzM</code>).</p>
|
|
<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.970014 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Listening <span class="token keyword">for</span> route connections on localhost:5248
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971150 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Listening <span class="token keyword">for</span> client connections on 0.0.0.0:5222
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971176 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> server <span class="token function">id</span> is 53Yi78q96t52QdyyWLKIyE
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971179 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> server is ready
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971199 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> Trying to connect to route on localhost:4248
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971551 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Route connection created
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971559 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Route connect msg sent
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971720 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Registering remote route <span class="token string">"xZfu3u7usAPWkuThomoGzM"</span>
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:14:59.971731 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Route sent local subscriptions
|
|
</code></pre>
|
|
<p>From the seed's server log, we see that the route is indeed accepted:</p>
|
|
<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:14:59.971602 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52679 - rid:1 - Route connection created
|
|
<span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:14:59.971733 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52679 - rid:1 - Registering remote route <span class="token string">"53Yi78q96t52QdyyWLKIyE"</span>
|
|
<span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:14:59.971739 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52679 - rid:1 - Route sent local subscriptions
|
|
</code></pre>
|
|
<p>Finally, let's start the third server:</p>
|
|
<pre class="language-"><code class="lang-sh">nats-server -p 6222 -cluster nats://localhost:6248 -routes nats://localhost:4248 -D
|
|
</code></pre>
|
|
<p>Again, notice that we use a different client port and cluster address, but still point to the same seed server at the address <code>nats://localhost:4248</code>:</p>
|
|
<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.528185 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Listening <span class="token keyword">for</span> route connections on localhost:6248
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.529787 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Listening <span class="token keyword">for</span> client connections on 0.0.0.0:6222
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.529829 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> server <span class="token function">id</span> is IRepas80TBwJByULX1ulAp
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.529842 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> server is ready
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.529872 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> Trying to connect to route on localhost:4248
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.530272 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Route connection created
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.530281 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Route connect msg sent
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.530408 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Registering remote route <span class="token string">"xZfu3u7usAPWkuThomoGzM"</span>
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.530414 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:4248 - rid:1 - Route sent local subscriptions
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.530595 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52727 - rid:2 - Route connection created
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.530659 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52727 - rid:2 - Registering remote route <span class="token string">"53Yi78q96t52QdyyWLKIyE"</span>
|
|
<span class="token punctuation">[</span>75764<span class="token punctuation">]</span> 2016/04/26 15:19:11.530664 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52727 - rid:2 - Route sent local subscriptions
|
|
</code></pre>
|
|
<p>First a route is created to the seed server (<code>...GzM</code>) and after that, a route from <code>...IyE</code> - which is the ID of the second server - is accepted.</p>
|
|
<p>The log from the seed server shows that it accepted the route from the third server:</p>
|
|
<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:19:11.530308 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52726 - rid:2 - Route connection created
|
|
<span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:19:11.530384 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52726 - rid:2 - Registering remote route <span class="token string">"IRepas80TBwJByULX1ulAp"</span>
|
|
<span class="token punctuation">[</span>75653<span class="token punctuation">]</span> 2016/04/26 15:19:11.530389 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:52726 - rid:2 - Route sent local subscriptions
|
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</code></pre>
|
|
<p>And the log from the second server shows that it connected to the third.</p>
|
|
<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:19:11.530469 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> Trying to connect to route on 127.0.0.1:6248
|
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<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:19:11.530565 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:6248 - rid:2 - Route connection created
|
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<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:19:11.530570 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:6248 - rid:2 - Route connect msg sent
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:19:11.530644 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:6248 - rid:2 - Registering remote route <span class="token string">"IRepas80TBwJByULX1ulAp"</span>
|
|
<span class="token punctuation">[</span>75665<span class="token punctuation">]</span> 2016/04/26 15:19:11.530650 <span class="token punctuation">[</span>DBG<span class="token punctuation">]</span> 127.0.0.1:6248 - rid:2 - Route sent local subscriptions
|
|
</code></pre>
|
|
<p>At this point, there is a full mesh cluster of NATS servers.</p>
|
|
<h3 id="testing-the-cluster">Testing the Cluster</h3>
|
|
<p>Now, the following should work: make a subscription to Node A then publish to Node C. You should be able to to receive the message without problems.</p>
|
|
<pre class="language-"><code class="lang-sh">nats-sub -s <span class="token string">"nats://192.168.59.103:7222"</span> hello <span class="token operator">&</span>
|
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|
|
nats-pub -s <span class="token string">"nats://192.168.59.105:7222"</span> hello world
|
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|
<span class="token punctuation">[</span><span class="token comment">#1] Received on [hello] : 'world'</span>
|
|
|
|
<span class="token comment"># GNATSD on Node C logs:</span>
|
|
<span class="token punctuation">[</span>1<span class="token punctuation">]</span> 2015/06/23 05:20:31.100032 <span class="token punctuation">[</span>TRC<span class="token punctuation">]</span> 192.168.59.103:7244 - rid:2 - <span class="token operator"><<</span>- <span class="token punctuation">[</span>MSG hello RSID:8:2 5<span class="token punctuation">]</span>
|
|
|
|
<span class="token comment"># GNATSD on Node A logs:</span>
|
|
<span class="token punctuation">[</span>1<span class="token punctuation">]</span> 2015/06/23 05:20:31.100600 <span class="token punctuation">[</span>TRC<span class="token punctuation">]</span> 10.0.2.2:51007 - cid:8 - <span class="token operator"><<</span>- <span class="token punctuation">[</span>MSG hello 2 5<span class="token punctuation">]</span>
|
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</code></pre>
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} else {
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const newUrl = window.location.href + "?" + param + "=" + encodeURIComponent(value);
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window.history.pushState("", "", newUrl);
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}
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}
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function getLanguageParameter() {
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var match = RegExp('[?&]lang=([^&]*)').exec(window.location.search);
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return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
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function docReady() {
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document.querySelectorAll('.api-lang').forEach(elem => {
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elem.addEventListener("click", function () {
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var curLang = sessionStorage.getItem('nats-api-language');
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var lang = this.getAttribute('data-language');
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// Stop the infinite loop
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return;
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}
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sessionStorage.setItem('nats-api-language', lang); // So we only do this 1x
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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-sharing/buttons.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|