etcd Backup and Restore

Etcd maintains the active state of the cluster, with the API Servers interacting by writing to and retrieving data from it. Each transaction executed in etcd is logged in a Write-Ahead Log (WAL) file specific to each cluster member. These files, which are updated by transactions initiated by the cluster’s “leader,” are periodically condensed into snapshots to conserve space. This snapshotting process is an integral part of etcd’s routine operations, and snapshots can also be manually triggered using the etcdctl tool with the snapshot save command.

install etcd 

  sudo apt install etcd

find server.crt

  sangam@sangam:~$ sudo find / -name server.crt 2>/dev/null
/etc/kubernetes/pki/etcd/server.crt

take backup 

  sangam@sangam:~$ sudo ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 \
    --cacert=/etc/kubernetes/pki/etcd/ca.crt \
    --cert=/etc/kubernetes/pki/etcd/server.crt \
    --key=/etc/kubernetes/pki/etcd/server.key \
    snapshot save /var/lib/etcd/backup.db
2024-04-26 03:53:42.172131 I | clientv3: opened snapshot stream; downloading
2024-04-26 03:53:42.188033 I | clientv3: completed snapshot read; closing
Snapshot saved at /var/lib/etcd/backup.db

check snapshot 

  
sangam@sangam:~$ sudo ls -lh /var/lib/etcd/backup.db
-rw-r--r-- 1 root root 3.2M Apr 26 03:53 /var/lib/etcd/backup.db
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Last updated 03 Jun 2024, 13:43 +0530 . history