I have a K8s cluster created with kubeadm that consists of a master node and two workers.
I am following this documentation article regarding the etcd backup: https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/#backing-up-an-etcd-cluster
I have to use etcdctl to backup the etcd db so I sh into the etcd pod running on the master node to do it from there: kubectl exec -it -n kube-system etcd-ip-x-x-x-x sh
NOTE: The master node hosts the etcd database in this path /var/lib/etcd which is mounted on the pod as a VolumeMount in /var/lib/etcd.
Following the doc I run: ETCDCTL_API=3 etcdctl --endpoints 127.0.0.1:2379 snapshot save snapshotdb and it returns the following error:
Error: rpc error: code = 13 desc = transport: write tcp 127.0.0.1:44464->127.0.0.1:2379: write: connection reset by peerWhat is the problem here?
I managed to make it work adding the certificates info to the command:
ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key /etc/kubernetes/pki/etcd/healthcheck-client.key snapshot save ./snapshot.db