Backup kubernetes cluster

General Discussions
1

Kubernetes version:1.21.0
Cloud being used: bare-metal
Installation method:kubeadm
Host OS: centos 7
CNI and version: Flannel v 0.3.1
CRI and version: Docker v 20.10.7

How to backup etcd in my current setup?

The etcdcl command gives and error:
-bash: etcdctl: command not found

The etcdctl command doesn’t work in my current setup please help.
Thanks

2

On CentOS, you have to get it yourself and it’s not packaged separately in the github repo.

[root@3cdac2ffafa9 ~]# curl -sLO https://github.com/etcd-io/etcd/releases/download/v3.5.0/etcd-v3.5.0-linux-amd64.tar.gz

[root@3cdac2ffafa9 ~]# tar -xzvf etcd-v3.5.0-linux-amd64.tar.gz 
etcd-v3.5.0-linux-amd64/
...truncated output ...
etcd-v3.5.0-linux-amd64/etcdutl
etcd-v3.5.0-linux-amd64/etcdctl
etcd-v3.5.0-linux-amd64/etcd

[root@3cdac2ffafa9 ~]# mv etcd-v3.5.0-linux-amd64/etcdctl /sbin/etcdctl

[root@3cdac2ffafa9 ~]# etcdctl version
etcdctl version: 3.5.0
API version: 3.5

After this, you need to set it up to talk to your cluster’s etcd. Which is not intuitive…

Looking at the steps I have for setting up Ubuntu with kubeadm, you need something like this in ~/.bashrc.

export ETCDCTL_API=3
export ETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt
export ETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt
export ETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key

I don’t know if the paths will be different on Cent OS or not, but after you get it working you can run:

$ etcdctl snapshot save <backup-file-location>
$ etcdctl snapshot restore  <backup-file-location>

More information on etcd related specifically to Kubernetes can be found here: