Workaround to ensure LXD is stopped before MicroCeph/MicroOVN

[simondeziel]

No description provided.

[simondeziel]

This was tested locally. Installing the snap then bind mounting the altered files from this PR.

We see that the override snippet only comes into play once the daemon is actually started after being woken up by the client request (lxc ls):

root@c1:~# mount -o ro,bind daemon.start /snap/lxd/current/commands/daemon.start 
root@c1:~# mount -o ro,bind remove /snap/lxd/current/snap/hooks/remove 
root@c1:~# systemctl cat snap.lxd.daemon.service
# /etc/systemd/system/snap.lxd.daemon.service
[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application lxd.daemon
Requires=snap-lxd-31214.mount
Wants=network.target
After=snap-lxd-31214.mount network.target snapd.apparmor.service
X-Snappy=yes

[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run lxd.daemon
SyslogIdentifier=lxd.daemon
Restart=on-failure
WorkingDirectory=/var/snap/lxd/31214
ExecStop=/usr/bin/snap run --command=stop lxd.daemon
ExecReload=/usr/bin/snap run --command=reload lxd.daemon
TimeoutStopSec=600
Type=simple
Delegate=true
root@c1:~# lxc ls
If this is your first time running LXD on this machine, you should also run: lxd init
To start your first container, try: lxc launch ubuntu:24.04
Or for a virtual machine: lxc launch ubuntu:24.04 --vm

+------+-------+------+------+------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+------+-------+------+------+------+-----------+
root@c1:~# systemctl cat snap.lxd.daemon.service
# /etc/systemd/system/snap.lxd.daemon.service
[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application lxd.daemon
Requires=snap-lxd-31214.mount
Wants=network.target
After=snap-lxd-31214.mount network.target snapd.apparmor.service
X-Snappy=yes

[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run lxd.daemon
SyslogIdentifier=lxd.daemon
Restart=on-failure
WorkingDirectory=/var/snap/lxd/31214
ExecStop=/usr/bin/snap run --command=stop lxd.daemon
ExecReload=/usr/bin/snap run --command=reload lxd.daemon
TimeoutStopSec=600
Type=simple
Delegate=true

# /run/systemd/system/snap.lxd.daemon.service.d/lxd-shutdown.conf
[Unit]
After=snap.microceph.daemon.service snap.microovn.daemon.service

Also, when removing the snap, the override snippet is cleaned up:

root@c1:~# snap remove lxd
2025-02-05T00:03:07Z INFO Waiting for "snap.lxd.daemon.service" to stop.
lxd removed
root@c1:~# ll /run/systemd/system/snap.lxd.daemon.service.d/
ls: cannot access '/run/systemd/system/snap.lxd.daemon.service.d/': No such file or directory

[tomponline]

Nice