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Signed-off-by: Matthias Hanel <mh@synadia.com>
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Matthias Hanel 2020-02-14 19:53:01 -05:00
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nats-server/configuration/gateways/README.md
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@ -21,11 +21,11 @@ Gateways exist to:
* reduce the number of connections required between servers
* optimize the interest graph propagation
If gateways are to be used in a cluster, **all** server of this cluster need to have a gateway configuration with the **same name**. Furthermore, every gateway node needs to be able to **connect to any** other gateway node and vice versa. Everything else is considered a misconfiguration.
If gateways are to be used in a cluster, **all** servers of this cluster need to have a gateway configuration with the **same name**. Furthermore, every gateway node needs to be able to **connect to any** other gateway node and vice versa. Everything else is considered a misconfiguration.
## Gateway Connections
A nats-server in a gateway role will specify a port where it will accept gateway connections. If the configuration specifies other _external_ `gateways`, the gateway will create one outbound gateway connection for each gateway in it's configuration. It will also gossip other gateways it knows or discovers. Fewer _external_ `gateways` mean less configuration. Yet, the ability to discover more gateways and gateway nodes depends on these servers running. This is similar to _seed server_ in cluster. It is recommended to have all _seed server_ of a cluster listed in the `gateways` section.
A nats-server in a gateway role will specify a port where it will accept gateway connections. If the configuration specifies other _external_ `gateways`, the gateway will create one outbound gateway connection for each gateway in its configuration. It will also gossip other gateways it knows or discovers. Fewer _external_ `gateways` mean less configuration. Yet, the ability to discover more gateways and gateway nodes depends on these servers running. This is similar to _seed server_ in cluster. It is recommended to have all _seed server_ of a cluster listed in the `gateways` section.
If the local cluster has three gateway nodes, this means there will be three outbound connections to each external gateway.
@ -61,7 +61,7 @@ Messages from clients directly connected to a gateway node will be sent along ou
* Interest-only Mode
* Queue Subscriptions
Local interest permitting, the receiving gateway node sends the messages directly to it's subscribing clients as well as server within the cluster.
Local interest permitting, the receiving gateway node sends the messages directly to its subscribing clients as well as server within the cluster.
### Optimistic Mode