etcd backup and recovery in Kubernetes - Mini Project: Build & Apply

etcd Backup and Recovery in Kubernetes

📖 Scenario: You are managing a Kubernetes cluster. The cluster's key-value store, etcd, holds all the important data about your cluster state. To keep your cluster safe, you want to create a backup of the etcd data and learn how to restore it if something goes wrong.

🎯 Goal: Learn how to create a backup of the etcd data using the etcdctl command and how to restore the cluster from that backup.

📋 What You'll Learn

Access to a Kubernetes control plane node

etcdctl installed and configured with correct environment variables

Basic command line knowledge

💡 Why This Matters

🌍 Real World

etcd stores all Kubernetes cluster data. Backing it up regularly protects your cluster from data loss due to failures or mistakes.

💼 Career

Kubernetes administrators and DevOps engineers must know how to backup and restore etcd to maintain cluster reliability and recover from disasters.

1

Set up environment variables for etcdctl

Set the environment variables ETCDCTL_API=3, ETCDCTL_ENDPOINTS=https://127.0.0.1:2379, ETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt, ETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt, and ETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key to configure etcdctl for secure communication with the etcd server.

Kubernetes

# Set environment variables for etcdctl
# Your code here

Need a hint?

Use export to set environment variables in the shell.

2

Create a snapshot backup of etcd data

Use the etcdctl snapshot save command to create a backup file named backup.db in the current directory.

Kubernetes

export ETCDCTL_API=3
export ETCDCTL_ENDPOINTS=https://127.0.0.1:2379
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
# Create etcd snapshot backup named backup.db
# Your code here

Need a hint?

Use etcdctl snapshot save backup.db to save the snapshot.

3

Restore etcd data from the snapshot

Use the etcdctl snapshot restore command with the snapshot file backup.db and specify the restore directory as /var/lib/etcd-from-backup.

Kubernetes

export ETCDCTL_API=3
export ETCDCTL_ENDPOINTS=https://127.0.0.1:2379
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
etcdctl snapshot save backup.db
# Restore etcd data from backup.db to /var/lib/etcd-from-backup
# Your code here

Need a hint?

Use etcdctl snapshot restore backup.db --data-dir /var/lib/etcd-from-backup to restore.

4

Verify the snapshot backup file exists

Use the ls command to list the file backup.db in the current directory and print the output.

Kubernetes

export ETCDCTL_API=3
export ETCDCTL_ENDPOINTS=https://127.0.0.1:2379
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
etcdctl snapshot save backup.db
etcdctl snapshot restore backup.db --data-dir /var/lib/etcd-from-backup
# List the backup.db file and print the output
# Your code here

Need a hint?

Use ls backup.db to check the file exists.