Update all LXD containers at once

The task

I need to update all guest OS running inside lxd containers with minimun risk and effort.

The basic concepts

To avoid having to enter each container and running update task(s), script must be ran from host system.

All my containers run Ubuntu or Debian, that simplifies the process a lot…

I use LXD snap version.

The solution

I have created this script to run on demand, but if you feel like a lucky rock star you can cron it…

(If you plan on run it on demand you can remove the ‘-y’ to be able to cancel full-upgrade process)

Filename example <lxd-updates.sh>:

#!/bin/sh

CONTAINERS="$(ls /var/snap/lxd/common/lxd/containers/)"

for container in $CONTAINERS; do

  echo "$(date): Updating $container..."

  lxc snapshot $container
  lxc exec $container -- apt update
  lxc exec $container -- apt -y full-upgrade

done

echo "$(date): Update done!"

Make the file executable:

$ chmod +x lxd-updates.sh

And run it:

$ ./lxd-updates.sh

Done!

Relax and grab a coffee…