As part of my daily cron jobs I thought it would be nice to get an overview of which Debian version the system is running and if all LXC containers have a matching version. The script below will check this for you:
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#!/bin/sh
SYSTEM_VERSION="$(cat /etc/debian_version)"
echo "System version: $SYSTEM_VERSION"
echo
CONTAINERS="`lxc-ls`"
for i in $CONTAINERS; do
CONTAINER_VERSION="$(cat /var/lib/lxc/$i/rootfs/etc/debian_version)"
if [ "$CONTAINER_VERSION" != "$SYSTEM_VERSION" ]; then
echo " ❗️ $i: $CONTAINER_VERSION (upgrade required)"
else
echo " ✅ $i: $CONTAINER_VERSION"
fi
done
Sample output:
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System version: 11.5
✅ daapd: 11.5
✅ minecraft: 11.5
❗️ sonos: 10.13 (upgrade required)
✅ timemachine: 11.5