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K8s is moving away from the "master" terminology, so kubespray should follow the same naming conventions. See 65d886bb30/sig-architecture/naming/recommendations/001-master-control-plane.md
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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"