lxd container migration

A simple way to move a container to another host.

Containers are located /var/lib/lxd/containers/

for example, to move container xxx

$tar cxvf xxx.tar.gz /var/lib/lxd/containers/xxx

$scp xxx.tar.gz user@remotehost:/home/user


At remote host, unpack files /var/lib/lxd/containers/

Then

$sudo lxc image import xxx



The container setup a shared folder before. After moving to a new host, it can't start because of this.

There is no /etc/subuid and /etc/subgid


Note: $UID is likely to be 1000 on an Ubuntu system if you're the only user.

$echo "root:$UID:1" | sudo tee -a /etc/subuid /etc/subgid

After this, the container can start.


The following is how to create a shared folder device in container

$ sudo lxc config device add xxx projectdir disk source=/home/user/prjs path=/home/user/prjs

Then set idmap

$sudo lxc stop xxx
$sudo lxc config set xxx raw.idmap 'both 1000 1000'
$sudo lxc start xxx