Annotations and Labels

Overview

Consul on Kubernetes provides a few options for customizing how connect-inject behavior should be configured. This allows the user to configure natively configure Consul on select Kubernetes resources (i.e. pods, services).

Annotations

Resource annotations could be used on the Kubernetes pod to control connnect-inject behavior.

consul.hashicorp.com/connect-inject - If this is "true" then injection is enabled. If this is "false" then injection is explicitly disabled. The default injector behavior requires pods to opt-in to injection by specifying this value as "true". This default can be changed in the injector's configuration if desired.
consul.hashicorp.com/transparent-proxy - If this is "true", this Pod will run with transparent proxy enabled. This means you can use Kubernetes DNS to access upstream services and all inbound and outbound traffic within the pod is redirected to go through the proxy.
consul.hashicorp.com/transparent-proxy-overwrite-probes - If this is "true" and transparent proxy is enabled, the Connect injector will overwrite Kubernetes HTTP probes to point to the Envoy proxy.
consul.hashicorp.com/transparent-proxy-exclude-inbound-ports - A comma-separated list of inbound ports to exclude from traffic redirection when running in transparent proxy mode.
consul.hashicorp.com/transparent-proxy-exclude-outbound-cidrs - A comma-separated list of outbound CIDRs to exclude from traffic redirection when running in transparent proxy mode.
consul.hashicorp.com/transparent-proxy-exclude-outbound-ports - A comma-separated list of outbound ports to exclude from traffic redirection when running in transparent proxy mode.
consul.hashicorp.com/transparent-proxy-exclude-uids - A comma-separated list of additional user IDs to exclude from traffic redirection when running in transparent proxy mode.
consul.hashicorp.com/connect-service - For pods that accept inbound connections, this specifies the name of the service that is being served. This defaults to the name of the Kubernetes service associated with the pod.
If using ACLs, this must be the same name as the Pod's ServiceAccount.
consul.hashicorp.com/connect-service-port - For pods that accept inbound connections, this specifies the port to route inbound connections to. This is the port that the service is listening on. The service port defaults to the first exposed port on any container in the pod. If specified, the value can be the name of a configured port, such as "http" or it can be a direct port value such as "8080". This is the port of the service, the proxy public listener will listen on a dynamic port.
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.
- Services
  The name of the service is the name of the service registered with Consul. You can optionally specify datacenters with this annotation.
```
annotations:
  "consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter]"
```
- Consul Enterprise Namespaces
  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 below for more details on configuring the injector.
```
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
```
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
```
annotations:
  "consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter],[service-name]:[port]:[optional datacenter]"
```
```
annotations:
  "consul.hashicorp.com/connect-service-upstreams":"[service-name]:[port]:[optional datacenter],prepared_query:[query name]:[port]"
```
consul.hashicorp.com/envoy-extra-args - A space-separated list of arguments to be passed to the injected envoy binary.
```
annotations:
  consul.hashicorp.com/envoy-extra-args: '--log-level debug --disable-hot-restart'
```
consul.hashicorp.com/service-tags - A comma separated list of tags that will be applied to the Consul service and its sidecar.
```
annotations:
  consul.hashicorp.com/service-tags: foo,bar,baz
```
If you need your tag to have a comma in it you can escape the comma with \,. For example, consul.hashicorp.com/service-tags: foo\,bar\,baz will become the single tag foo,bar,baz.
consul.hashicorp.com/service-meta-<YOUR_KEY> - Set Consul meta key/value pairs that will be applied to the Consul service and its sidecar. The key will be what comes after consul.hashicorp.com/service-meta-, e.g. consul.hashicorp.com/service-meta-foo: bar will result in foo: bar.
```
annotations:
  consul.hashicorp.com/service-meta-foo: baz
  consul.hashicorp.com/service-meta-bar: baz
```
consul.hashicorp.com/sidecar-proxy- - Override default resource settings for the sidecar proxy container. The defaults are set in Helm config via the connectInject.sidecarProxy.resources key.
- consul.hashicorp.com/sidecar-proxy-cpu-limit - Override the default CPU limit.
- consul.hashicorp.com/sidecar-proxy-cpu-request - Override the default CPU request.
- consul.hashicorp.com/sidecar-proxy-memory-limit - Override the default memory limit.
- consul.hashicorp.com/sidecar-proxy-memory-request - Override the default memory request.
consul.hashicorp.com/consul-sidecar- - Override default resource settings for the consul-sidecar container. The defaults are set in Helm config via the global.consulSidecarContainer.resources key.
- consul.hashicorp.com/consul-sidecar-cpu-limit - Override the default CPU limit.
- consul.hashicorp.com/consul-sidecar-cpu-request - Override the default CPU request.
- consul.hashicorp.com/consul-sidecar-memory-limit - Override the default memory limit.
- consul.hashicorp.com/consul-sidecar-memory-request - Override the default memory request.
consul.hashicorp.com/enable-metrics - Override the default Helm value connectInject.metrics.defaultEnabled.
consul.hashicorp.com/enable-metrics-merging - Override the default Helm value connectInject.metrics.defaultEnableMerging.
consul.hashicorp.com/merged-metrics-port - Override the default Helm value connectInject.metrics.defaultMergedMetricsPort.
consul.hashicorp.com/prometheus-scrape-port - Override the default Helm value connectInject.metrics.defaultPrometheusScrapePort.
consul.hashicorp.com/prometheus-scrape-path - Override the default Helm value connectInject.metrics.defaultPrometheusScrapePath.
consul.hashicorp.com/service-metrics-port - Set the port where the Connect service exposes metrics.
consul.hashicorp.com/service-metrics-path - Set the path where the Connect service exposes metrics.

Labels

Resource labels could be used on a Kubernetes service to control connect-inject behavior.

consul.hashicorp.com/service-ignore - This label can be set on a Kubernetes Service. If set to "true", the service will not be used to register a Consul endpoint. This can be useful in cases where 2 or more services point to the same deployment. Consul cannot register multiple endpoints to the same deployment. This label can be used to tell the endpoint registration to ignore all services except for the one which should be used for routing requests using Consul.