xcache service unit

Show status

systemctl status systemd-nspawn@xcache

Restart

systemctl restart systemd-nspawn@xcache

Show logs

journalctl -eu systemd-nspawn@xcache [--since ...]

container commands

get a shell as xrootd user in a new temporary container using the xcache image

systemd-nspawn --keep-unit --register=no -M xcache /bin/bash

/bin/bash can also be replaced by an arbitrary command to be run. Pass -u root to get a root shell inside the container.

To run an image other than /var/lib/machines/xcache additional options have to be passed on the command line since it won't read /etc/systemd/nspawn/xcache.nspawn then, e.g.

systemd-nspawn --volatile=overlay --register=no --private-users=655360 -u xrootd -D /var/lib/machines/<some-other-image> <some-command>

To get a shell in the running xcache container (as root, usually not nescessary)

nsenter --target=$(machinectl show --property Leader xcache | sed "s/^Leader=//")  --all

inside, one can then switch to a shell as the xrootd user with e.g.

su -s /bin/bash xrootd

Manually delete files from cache

This needs to be done inside the running container since it may need to clean up rucio metalink files from dev/shm which is currently a directory inside the container (not bind mounted).

So, as root do

nsenter --target=$(machinectl show --property Leader xcache | sed "s/^Leader=//")  --all

And then

/var/local/xcache/rm_cached_file.sh <pattern>
# e.g. to delete all files starting with AOD.05536542
/var/local/xcache/rm_cached_file.sh AOD.05536542
# or all files in the mc15_13TeV scope
/var/local/xcache/rm_cached_file.sh mc15_13TeV