LXD: Management notes

lxc-update-vm.sh

#!/bin/bash
# Purpose: Update all lxd vms
# -------------------------------------------------------

# Get the vm list
vms="$(lxc list volatile.last_state.power=RUNNING -c n --format csv)"

# Update each vm
update_vm(){
  local vm="$1"
  echo "*** [VM: $vm [$(hostname) @ $(date)] ] ***"

  ostype=`lxc config get "$vm" image.os `

  case "$ostype" in
    # APT-based
    debian)
      ;&
    ubuntu)
      echo "apt-based update"
      lxc exec "$vm" apt-get -- -qq update
      lxc exec "$vm" apt-get -- -qq -y dist-upgrade
      lxc exec "$vm" apt-get -- -qq -y clean
      lxc exec "$vm" apt-get -- -qq -y autoclean
      ;;
    #----------
    # RPM-based
    redhat)
      ;&
    centos)
      echo "rpm-based update"
      lxc exec "$vm" -- yum update -y
      ;;
    *)
      echo "Unknown or unsupported distribution. Check image.os property"
  esac

  echo "-----------------------------------------------------------------"
}

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

lxd-management-notes.md

Notes about managing LXD

The following list of quick notes about managing LXD is something that I've found a little bit hard to get my head around when moving from LXC to LXD. Documentation for some parts wasn't very obvious and this is just my notes to not forget this info.

Probably for majority of people this is now obvious, but I've just started moving LXC->LXD and scripts are broken for 3.0 version of configuration.

Setting common setting for all containers:

Use profiles & set shared setting there.

lxc profile edit default

Setting container autostart:

lxc config set <container> boot.autostart <true|false>

Static IP for containers:

lxc network attach lxdbr0 <container> eth0 eth0
lxc config device set <container> eth0 ipv4.address <static-ip>

Edit post-migration LXC->LXD container NIC:

lxc config edit <container>
>
...
devices:                   
  eth0:                    
    ipv4.address: <ip>
    name: eth0             
    nictype: bridged       
    parent: lxdbr0         
    type: nic              
...

Disable IPv6 of lxdbr0 network

lxc network set lxdbr0 ipv6.address none