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Backing Up a LXD Server

While there are multiple methods to backing up a LXD server, one way involves creating a second LXD server to work as a live spare that we can failover to should the need arise. This server will contain recent copies of our containers and should be set up to automatically receive these container copies. In this hands-on lab, we'll be doing just that. We'll create a secondary backup server, then write a short Bash script to copy over our backups. This script will then get added to our crontab to run automatically.

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Path Info

Clock icon Beginner
Clock icon 30m
Clock icon Apr 03, 2020

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Table of Contents

  1. Challenge

    Configure the Remote

    Log in to the "Backup Remote" server. LXD has already been installed, and only needs to be configured:

    lxd init

    Use the default settings until asked if LXD should be available over the network, then type yes. Bind to all addresses and the default port, then set the password to pinehead:

    Would you like LXD to be available over the network? (yes/no) [default=no]: yes
    Address to bind LXD to (not including port) [default=all]:
    Port to bind LXD to [default=8443]:
    Trust password for new clients: pinehead
    Again: pinehead

    On the LXD server, add the Backup server as a remote:

    lxc remote add backups
  2. Challenge

    Write a Backup Script

    To create a backup, we want to work in two steps: Taking the snapshot and copying over the snapshot over to the backup remote. We also need to remove any existing backup snapshots and containers:

    #! /bin/bash
    containers="web1 db1"
    for c in $containers
            lxc delete $c/backup &> /dev/null
            lxc snapshot $c backup
            lxc delete backup:$c &> /dev/null
            lxc copy local:${c}/backup backups:$c

    When finished, ensure the script is executable:

    chmod +x
  3. Challenge

    Add the Script to the Crontab

    Add the script to your crontab:

    crontab -e
    0 0 * * * /home/cloud_user/

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