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etcd

Deployment Types

It is possible to deploy etcd with three methods. To change the default deployment method (host), use the etcd_deployment_type variable. Possible values are host, kubeadm, and docker.

Host

Host deployment is the default method. Using this method will result in etcd installed as a systemd service.

Docker

Installs docker in etcd group members and runs etcd on docker containers. Only usable when container_manager is set to docker.

Kubeadm

This deployment method is experimental and is only available for new deployments. This deploys etcd as a static pod on control plane hosts.

Metrics

To expose metrics on a separate HTTP port, define it in the inventory with:

etcd_metrics_port: 2381

To create a service etcd-metrics and associated endpoints in the kube-system namespace, define its labels in the inventory with:

etcd_metrics_service_labels:
  k8s-app: etcd
  app.kubernetes.io/managed-by: Kubespray
  app: kube-prometheus-stack-kube-etcd
  release: prometheus-stack

The last two labels in the above example allows to scrape the metrics from the kube-prometheus-stack chart with the following Helm values.yaml :

kubeEtcd:
  service:
    enabled: false

To fully override metrics exposition urls, define it in the inventory with:

etcd_listen_metrics_urls: "http://0.0.0.0:2381"

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