c12s-kubespray/docs/etcd.md

47 lines
1.3 KiB
Markdown
Raw Permalink Normal View History

# 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 in master hosts.
## Metrics
To expose metrics on a separate HTTP port, define it in the inventory with:
```yaml
etcd_metrics_port: 2381
```
To create a service `etcd-metrics` and associated endpoints in the `kube-system` namespace,
define it's labels in the inventory with:
```yaml
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](https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack)
chart with the following Helm `values.yaml` :
```yaml
kubeEtcd:
service:
enabled: false
```