How to create a backup/snapshot of ETCD in OpenShift 3.11

Solution Verified - Updated

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 3.10
    • 3.11

Issue

How to create a backup or snapshot of ETCD database in OpenShift 3.11?

Resolution

Preparation

It is important to run the backup process on healthy ETCD cluster. Do not attempt to create a backup if the cluster is unstable or cluster being completely down.
In case of cluster being down, create a backup using Option B in the guide below.

Backup of ETCD

The following only needs to be performed on one ETCD host.

Option A: Capture a snapshot

# etcdctl3 snapshot save /var/lib/etcd/snapshot.db

  • From the host, copy to a new location, as the above will run the etcdctl command in a container and save to a host mounted volume. We will delete the /var/lib/etcd path in later steps. 

      # cp /var/lib/etcd/snapshot.db /tmp/snapshot.db

Option B: Back up existing database

# cp /var/lib/etcd/member/snap/db /tmp/db
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