Bash script to update the Proxmox Virtualizer and all the running containers using their respective package manager. Supports apt-get, yum and dnf. Log everything to file as well.

update_pve_and_containers.sh

#!/bin/bash
#
# Update PVE machine
# Update all running containers
set -x
exec 3>&1 4>&2
trap 'exec 2>&4 1>&3' 0 1 2 3 RETURN
exec 1>${0}.log 2>&1 1>&3

# list of container ids we need to iterate through
containers=$(pct list | tail -n +2 | cut -f1 -d' ')

function update_container() {
  container=$1
  echo "[Info] Updating $container"
  # to chain commands within one exec we will need to wrap them in bash
  if [ -n "$(pct exec $container -- which apt-get 2>/dev/null)" ]; then
    echo "[Info] Debian-based container $container"
    pct exec $container -- bash -c "apt-get update && apt-get upgrade -y && apt-get autoremove -y"
  elif [ -n "$(pct exec $container -- which yum 2>/dev/null)" ]; then
    echo "[Info] RPM-based container $container"
    pct exec $container -- bash -c "yum update -y"
  elif [ -n "$(pct exec $container -- which dnf 2>/dev/null)" ]; then
    echo "[Info] DNF-based container $container"
    pct exec $container -- bash -c "dnf upgrade --refresh -y"
  fi
}

echo "[Info] Updating Proxmox Virtualizer"
apt-get update
apt-get upgrade -y

for container in $containers
do
  status=`pct status $container`
  if [ "$status" == "status: running" ]; then
    update_container $container
  fi
done; wait

exit 0