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docs: Update docs to reflect limitation in TProxy when using single Consul DC deployment with multiple k8s clusters (#10549) 

* docs: Update to reflect single Consul DC deployment with multiple k8s clusters
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David Yu 2021-07-08 10:44:29 -07:00 committed by GitHub
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website/content/docs/connect/transparent-proxy.mdx
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@ -138,6 +138,8 @@ Services can also dial explicit upstreams in other datacenters without transpare
[annotation](/docs/k8s/connect#consul-hashicorp-com-connect-service-upstreams) such as
`"consul.hashicorp.com/connect-service-upstreams": "my-service:1234:dc2"` to reach an upstream service called `my-service`
in the datacenter `dc2`.
* In the deployment configuration where a [single Consul datacenter spans multiple Kubernetes clusters](https://www.consul.io/docs/k8s/installation/deployment-configurations/single-dc-multi-k8s), services in one Kubernetes cluster must explicitly dial a service in another Kubernetes cluster using the [consul.hashicorp.com/connect-service-upstreams](/docs/k8s/connect#consul-hashicorp-com-connect-service-upstreams) annotation. An example would be
`"consul.hashicorp.com/connect-service-upstreams": "my-service:1234"`, where `my-service` is the service that exists in another Kubernetes cluster and is exposed on port `1234`. Although Transparent Proxy is enabled, KubeDNS is not utilized when communicating between services existing on separate Kubernetes clusters.
* When dialing headless services the request will be proxied using a plain TCP proxy with a 5s connection timeout.
Currently the upstream's protocol and connection timeout are not considered.

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website/content/docs/k8s/installation/deployment-configurations/single-dc-multi-k8s.mdx
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@ -182,6 +182,8 @@ helm install cluster2 -f cluster2-config.yaml hashicorp/consul
## Verifying the Consul Service Mesh works
~> When Transparent proxy is enabled, services in one Kubernetes cluster that need to communicate with a service in another Kubernetes cluster must have a explicit upstream configured through the ["consul.hashicorp.com/connect-service-upstreams"](https://www.consul.io/docs/k8s/connect#consul-hashicorp-com-connect-service-upstreams) annotation.
Now that we have our Consul cluster in multiple k8s clusters up and running, we will
deploy two services and verify that they can connect to each other.