Lxc copy: Error transferring instance data: exit status 22

[candlerb (Brian Candler)]

Aha: after more searching I found the solution in another thread:

Cannot copy/move from LXD 2.0 to LXD 4.4

On the 2.0 source 15:51:30 exec 30380 rsync -arvP --devices --numeric-ids --partial --sparse /var/lib/lxd/containers/survey/ localhost:/tmp/foo -e sh -c "/usr/bin/lxd netcat @lxd/fc00c6d5-85de-4b2a-b7b9-7ecbf10ece77 survey" 15:51:30 fork 30380 parent rsync -arvP --devices --numeric-ids --partial --sparse /var/lib/lxd/containers/survey/ localhost:/tmp/foo -e sh -c "/usr/bin/lxd netcat @lxd/fc00c6d5-85de-4b2a-b7b9-7ecbf10ece77 survey" 15:51:30 fork 30381 child …

Solution: create /usr/local/bin/rsync containing

#!/bin/sh
exec /usr/bin/rsync --xattrs --delete --compress --compress-level=2 "$@"

(and this even works with the stock rsync-3.1.1 xenial package)

Phew! Glad to be getting rid of this legacy server

Edit: the filesystem copied successfully, but the container’s init process (symlink to /lib/systemd/systemd) doesn’t launch any processes. At least the filesystem copied OK, so it’s a different problem to investigate…

root@ix-dns1-new:~# lxc exec ix-dc1 bash
root@ix-dc1:~# ps auxwww
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root           1  0.0  0.0  36612  2020 ?        Ss   16:20   0:00 /sbin/init
root          22  0.0  0.0  21804  3748 pts/1    Ss   16:21   0:00 bash
root          34  0.0  0.0  37764  3060 pts/1    R+   16:21   0:00 ps auxwww
root@ix-dc1:~#

… and it seems to be this problem (Ubuntu 16.04 won’t work in a cgroup2 environment). Fortunately, this is a container I can retire (I tested it first because it was the least important), and the important ones are 20.04.