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Merge pull request #13550 from hashicorp/docs/peering-upstream-annotation 

Docs/peering upstream annotation
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website/content/docs/k8s/annotations-and-labels.mdx
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@ -17,7 +17,7 @@ This allows the user to configure natively configure Consul on select Kubernetes
## Annotations
Resource annotations could be used on the Kubernetes pod to control connect-inject behavior.
The following Kubernetes resource annotations could be used on a pod to control connect-inject behavior:
- `consul.hashicorp.com/connect-inject` - If this is "true" then injection
is enabled. If this is "false" then injection is explicitly disabled.
@ -67,55 +67,91 @@ Resource annotations could be used on the Kubernetes pod to control connect-inje
- `consul.hashicorp.com/connect-service-upstreams` - The list of upstream
services that this pod needs to connect to via Connect along with a static
local port to listen for those connections. When transparent proxy is enabled,
this annotation is optional.
this annotation is optional. There are a few formats this annotation can take:
- Services
- Unlabeled:
Use the unlabeled annotation format to specify a service name, Consul Enterprise namespaces and partitions, and
datacenters. To use [cluster peering](/docs/connect/cluster-peering/k8s) with upstreams, use the following
labeled format.
- Service name: Place the service name at the beginning of the annotation to specify the upstream service. You can
also append the datacenter where the service is deployed (optional).
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter]"
```
- Namespace (requires Consul Enterprise 1.7+): Upstream services may be running in different a namespace. Place
the upstream namespace after the service name. For additional details about configuring the injector, refer to
[Consul Enterprise Namespaces](#consul-enterprise-namespaces) .
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].[service-namespace]:[port]:[optional datacenter]"
```
If the namespace is not specified, the annotation defaults to the namespace of the source service.
If you are not using Consul Enterprise 1.7+, Consul interprets the value placed in the namespace position as part of the service name.
The name of the service is the name of the service registered with Consul. You can optionally specify datacenters with this annotation.
- Admin partitions (requires Consul Enterprise 1.11+): Upstream services may be running in a different
partition. You must specify the namespace when specifying a partition. Place the partition name after the namespace. If you specify the name of the datacenter (optional), it must be the local datacenter. Communicating across partitions using this method is only supported within a
datacenter. For cross partition communication across datacenters, refer to [cluster
peering](/docs/connect/cluster-peering/k8s).
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].[service-namespace].[service-partition]:[port]:[optional datacenter]"
```
- [Prepared queries](/docs/connect/proxies#dynamic-upstreams-require-native-integration): Prepend the annotation
with `prepared_query` and place the name of the query at the beginning of the string.
```yaml
annotations:
'consul.hashicorp.com/connect-service-upstreams': 'prepared_query:[query name]:[port]'
```
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter]"
```
- Labeled (requires Consul for Kubernetes v0.45.0+):
The labeled format is required when using the cluster peering feature and specifying an upstream in another
peer. You can specify a Consul Enterprise namespace, partition, or datacenter. The format supports only one peer, datacenter, or partition.
- Service name: Place the service name at the beginning of the annotation followed by `.svc` to specify the upstream service.
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].svc:[port]"
```
- Peer or datacenter: Place the peer or datacenter after `svc.` followed by either `peer` or `dc` and the port number.
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].svc.[service-peer].peer:[port]"
```
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].svc.[service-dc].dc:[port]"
```
- Namespace (required Consul Enterprise): Place the namespace after `svc.` followed by `ns` and the port number.
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].svc.[service-namespace].ns:[port]"
```
When specifying a peer, datacenter, or admin partition when namespaces are enabled, you must
provide the namespace .
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].svc.[service-namespace].ns.[service-peer].peer:[port]"
```
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].svc.[service-namespace].ns.[service-partition].ap:[port]"
```
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].svc.[service-namespace].ns.[service-dc].dc:[port]"
```
- Consul Enterprise Namespaces
- Multiple upstreams: Delimit multiple services or upstreams with commas. You can specify any of the unlabeled, labeled, or prepared query formats when using the supported versions for the formats.
If running Consul Enterprise 1.7+, your upstream services may be running in different
namespaces. The upstream namespace can be specified after the service name
as `[service-name].[namespace]`. See [Consul Enterprise Namespaces](#consul-enterprise-namespaces)
below for more details on configuring the injector.
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter],[service-name]:[port]:[optional datacenter]"
```
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name].[service-namespace]:[port]:[optional datacenter]"
```
-> **NOTE:** If the namespace is not specified it will default to the namespace
of the source service.
~> **WARNING:** Setting a namespace when not using Consul Enterprise or using a version < 1.7
is not supported. It will be treated as part of the service name.
- [Prepared Query](/docs/connect/proxies#dynamic-upstreams-require-native-integration)
```yaml
annotations:
'consul.hashicorp.com/connect-service-upstreams': 'prepared_query:[query name]:[port]'
```
- Multiple Upstreams
If you would like to specify multiple services or upstreams, delimit them with commas
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter],[service-name]:[port]:[optional datacenter]"
```
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter],prepared_query:[query name]:[port]"
```
```yaml
annotations:
"consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter],prepared_query:[query name]:[port],[service-name].svc:[port]"
```
- `consul.hashicorp.com/envoy-extra-args` - A space-separated list of [arguments](https://www.envoyproxy.io/docs/envoy/latest/operations/cli)
to be passed to the injected envoy binary.