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Specify that mesh gateways require Envoy (#6506)

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* Specify that mesh gateways must operate on L7

* Add feedback from Matt

* clarify gateway requirements
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Judith Malnick 2019-09-26 20:06:58 -07:00 committed by GitHub
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website/source/docs/connect/mesh_gateway.html.md
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@ -36,6 +36,24 @@ Mesh gateways also require that your Consul datacenters are configured correctly
- [gRPC](/docs/agent/options.html#grpc_port) must be enabled.
- If you want to [enable gateways globally](/docs/connect/mesh_gateway.html#enabling-gateways-globally) you must enable [centralized configuration](/docs/agent/options.html#enable_central_service_config).
Currently, Envoy is the only proxy with mesh gateway capabilities in Consul.
- Mesh gateway proxies receive their configuration through Consul, which
automatically generates it based on the proxy's registration. Currently Consul
can only translate mesh gateway registration information into Envoy
configuration, therefore the proxies acting as mesh gateways must be Envoy.
- Sidecar proxies that send traffic to an upstream service through a gateway
need to know the location of that gateway. They discover the gateway based on
their sidecar proxy registrations. Consul can only translate the gateway
registration information into Envoy configuration, so any sidecars that send
upstream traffic through a gateway must be Envoy.
Sidecar proxies that don't send upstream traffic through a gateway aren't
affected when you deploy gateways. If you are using Consul's built-in proxy as a
Connect sidecar it will continue to work for intra-datacenter traffic and will
receive incoming traffic even if that traffic has passed through a gateway.
## Modes of Operation
Each upstream of a Connect proxy can be configured to be routed through a mesh gateway. Depending on