k3s/k3os Remove Master Node from embedded ETCD

gistfile1.txt

https://github.com/k3s-io/k3s/issues/2732#issuecomment-749181797

Run pod with etcdctl:
kubectl run --rm --tty --stdin --image docker.io/bitnami/etcd:latest etcdctl --overrides='{"apiVersion":"v1","kind":"Pod","spec":{"hostNetwork":true,"restartPolicy":"Never","securityContext":{"runAsUser":0,"runAsGroup":0},"containers":[{"command":["/bin/bash"],"image":"docker.io/bitnami/etcd:latest","name":"etcdctl","stdin":true,"stdinOnce":true,"tty":true,"volumeMounts":[{"mountPath":"/var/lib/rancher","name":"var-lib-rancher"}]}],"volumes":[{"name":"var-lib-rancher","hostPath":{"path":"/var/lib/rancher","type":"Directory"}}]}}'


Remove member (must use hex ID):
./bin/etcdctl --key /var/lib/rancher/k3s/server/tls/etcd/client.key --cert /var/lib/rancher/k3s/server/tls/etcd/client.crt --cacert /var/lib/rancher/k3s/server/tls/etcd/server-ca.crt member remove 327051268c526155

List Members:
 ./bin/etcdctl --key /var/lib/rancher/k3s/server/tls/etcd/client.key --cert /var/lib/rancher/k3s/server/tls/etcd/client.crt --cacert /var/lib/rancher/k3s/server/tls/etcd/server-ca.crt member list

Appreciate it. This popped up on a Google search and helped me restore one of my clusters.

This is still very helpful!
Since bitnami deprecated its images the command for spawning the pod needs a little adjustment. Additionally if your control plane has taints, you might need to add a toleration for that:

kubectl run --rm --tty --stdin --image docker.io/bitnamilegacy/etcd:latest etcdctl --overrides='{"apiVersion":"v1","kind":"Pod","spec":{"hostNetwork":true,"restartPolicy":"Never","securityContext":{"runAsUser":0,"runAsGroup":0},"containers":[{"command":["/bin/bash"],"image":"docker.io/bitnamilegacy/etcd:latest","name":"etcdctl","stdin":true,"stdinOnce":true,"tty":true,"volumeMounts":[{"mountPath":"/var/lib/rancher","name":"var-lib-rancher"}]}],"volumes":[{"name":"var-lib-rancher","hostPath":{"path":"/var/lib/rancher","type":"Directory"}}], "tolerations":[{"key":"node-role.kubernetes.io/control-plane"}] }}'