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Update etcd-backup-and-restore.md

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vpalazhi 2020-12-14 15:55:18 -05:00 committed by GitHub
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practice-questions-answers/cluster-maintenance/backup-etcd/etcd-backup-and-restore.md
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@ -33,6 +33,12 @@ ETCDCTL_API=3 etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kuberne
snapshot save /opt/snapshot-pre-boot.db snapshot save /opt/snapshot-pre-boot.db
``` ```
Note: In this case, the **ETCD** is running on the same server where we are running the commands (which is the *controlplane* node). As a result, the **--endpoint **argument is optional and can be ignored.
The options **--cert, --cacert and --key** are mandatory to authenticate to the ETCD server to take the backup.
If you want to take a backup of the ETCD service running on a different machine, you will have to provide the correct endpoint to that server (which is the IP Address and port of the etcd server with the **--endpoint **argument)
# ----------------------------- # -----------------------------
# Disaster Happens # Disaster Happens
# ----------------------------- # -----------------------------
@ -40,12 +46,12 @@ ETCDCTL_API=3 etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kuberne
# 3. Restore ETCD Snapshot to a new folder # 3. Restore ETCD Snapshot to a new folder
``` ```
ETCDCTL_API=3 etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt \ ETCDCTL_API=3 etcdctl --data-dir /var/lib/etcd-from-backup \
--cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key \
--data-dir /var/lib/etcd-from-backup \
snapshot restore /opt/snapshot-pre-boot.db snapshot restore /opt/snapshot-pre-boot.db
``` ```
Note: In this case, we are restoring the snapshot to a different directory but in the same server where we took the backup (**the controlplane node)**
As a result, the only required option for the restore command is the **--data-dir**.
# 4. Modify /etc/kubernetes/manifests/etcd.yaml # 4. Modify /etc/kubernetes/manifests/etcd.yaml
Update ETCD POD to use the new hostPath directory `/var/lib/etcd-from-backup` by modifying the pod definition file at `/etc/kubernetes/manifests/etcd.yaml`. When this file is updated, the ETCD pod is automatically re-created as this is a static pod placed under the `/etc/kubernetes/manifests` directory. Update ETCD POD to use the new hostPath directory `/var/lib/etcd-from-backup` by modifying the pod definition file at `/etc/kubernetes/manifests/etcd.yaml`. When this file is updated, the ETCD pod is automatically re-created as this is a static pod placed under the `/etc/kubernetes/manifests` directory.