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Notes: Automating Container Updates

This would have worked in an lxc only world...

#!/bin/bash
# Purpose: Update all lxc vms
# Note: Tested on Ubuntu LTS only
# Author: Vivek Gite <www.cyberciti.biz>, under GPL v2+
# -------------------------------------------------------

# Get the vm list
vms="$(lxc-ls --active)"

# Update each vm

update_vm(){
        local vm="$1"
        echo "*** [VM: $vm [$(hostname) @ $(date)] ] ***"
        /usr/bin/lxc-attach -n "$vm" apt-get -- -qq update
        /usr/bin/lxc-attach -n "$vm" apt-get -- -qq -y upgrade
        /usr/bin/lxc-attach -n "$vm" apt-get -- -qq -y clean
        /usr/bin/lxc-attach -n "$vm" apt-get -- -qq -y autoclean 
        # Note for RHEL/CentOS/Fedora Linux comment above two line and uncomment the following line #
        # lxc-attach -n "$vm" yum -y update 
        echo "-----------------------------------------------------------------"
}

# Do it
for v in $vms
do
    update_vm "$v"
done

This works for updating everything debian under the lxd.. Not sure you need anything else :)

Shell Fragment for looking at os distribution. 

# Determine OS platform
UNAME=$(uname | tr "[:upper:]" "[:lower:]")
# If Linux, try to determine specific distribution
if [ "$UNAME" == "linux" ]; then
    # If available, use LSB to identify distribution
    if [ -f /etc/lsb-release -o -d /etc/lsb-release.d ]; then
        export DISTRO=$(lsb_release -i | cut -d: -f2 | sed s/'^\t'//)
    # Otherwise, use release info file
    else
        export DISTRO=$(ls -d /etc/[A-Za-z]*[_-][rv]e[lr]* | grep -v "lsb" | cut -d'/' -f3 | cut -d'-' -f1 | cut -d'_' -f1)
    fi
fi
# For everything else (or if above failed), just use generic identifier
[ "$DISTRO" == "" ] && export DISTRO=$UNAME
unset UNAME

Linkdump

  • https://askubuntu.com/questions/459402/how-to-know-if-the-running-platform-is-ubuntu-or-centos-with-help-of-a-bash-scri
  • https://ask.fedoraproject.org/en/question/49738/how-to-check-if-system-is-rpm-or-debian-based/
  • http://fuckingshellscripts.org/
  • https://etbe.coker.com.au/2007/08/30/identifying-the-distribution-of-a-linux-system/

  • https://ask.fedoraproject.org/en/question/49738/how-to-check-if-system-is-rpm-or-debian-based/

  • https://hvops.com/articles/ansible-vs-shell-scripts/

  • https://news.ycombinator.com/item?id=6431552
  • https://www.cyberciti.biz/faq/how-to-update-debian-or-ubuntu-linux-containers-lxc/
  • https://blog.sleeplessbeastie.eu/2017/08/21/how-to-upgrade-lxd-guests/
  • https://blog.selectel.com/managing-containers-lxd-brief-introduction/
  • http://xmodulo.com/lxc-containers-ubuntu.html