Update/snapshot all lxc containers (debian, ubuntu, fedora, centos and alpine supported)

snapshot-lxc.containers.sh

#!/usr/bin/env bash

snapshot_containers () {
  running_containers=()
  while IFS= read -r line; do
    running_containers+=( "$line" )
  done < <( lxc list --columns=ns --format=json \
    | jq --raw-output 'map(select(.status | contains("Running")) | .name) | .[]' )
  for i in "${running_containers[@]}"; do
    echo "taking snapshot of apt based container: $i"
    lxc stop $i
    sleep 1s
    lxc snapshot $i
    lxc start $i
  done
}

snapshot_containers

update-lxc-containers.sh

#!/usr/bin/env bash

apt_containers=()
while IFS= read -r line; do
  apt_containers+=( "$line" )

done < <( lxc list --columns=ns --format=json \
  | jq --raw-output \
  'map(select(.config["image.os"] | contains("ubuntu") or contains("debian")) | .name) | .[]' )
for i in "${apt_containers[@]}"; do
  echo "updating apt based container: $i"
  lxc exec $i --force-noninteractive -- sh -c "apt-get --yes update"
  lxc exec $i --force-noninteractive -- sh -c "apt-get --yes full-upgrade"
  lxc exec $i --force-noninteractive -- sh -c "apt-get --yes autoremove"
done

alpine_containers=()
while IFS= read -r line; do
  alpine_containers+=( "$line" )
done < <( lxc list --columns=ns --format=json \
  | jq --raw-output \
  'map(select(.config["image.os"] | contains("Alpine")) | .name) | .[]' )
for i in "${alpine_containers[@]}"; do
  echo "updating alpine apk based container: $i"
  lxc exec $i --force-noninteractive -- sh -c "apk update && apk upgrade"
done

yum_containers=()
while IFS= read -r line; do
  yum_containers+=( "$line" )
done < <( lxc list --columns=ns --format=json \
  | jq --raw-output \
  'map(select(.config["image.os"] | contains("Fedora") or contains("Centos")) | .name) | .[]' )
for i in "${yum_containers[@]}"
do
 echo "updating Fedora rpm based container: $i"
 lxc exec $i --force-noninteractive -- bash -c "[[ \"$(command -v dnf >/dev/null 2>&1; echo $?)\" = \"1\" ]] && yum -y update || dnf -y upgrade"
done