Execute a call to an API before reboot and after boot

nfn

Hi

I want to call an api with curl before reboot or shutdown -r now and after boot for maintenance propose, only when I call reboot manually and came out with this.

It works, but it's calling the api on shutdown now/halt too.

The ideia it to call this api to disable monitoring on reboot and enable it on boot.

Any suggestions?

[Unit]
Description = Maintenance mode
Before = reboot.target
After = network-online.target boot-complete.target
Requires = network-online.target
Conflicts = halt.target poweroff.target

[Service]
User = root
Group = root
Type = oneshot
RemainAfterExit = yes
ExecStart = "/usr/local/bin/maintenance-on.sh"
ExecStop = "/usr/local/bin/maintenance-off.sh"

[Install]
WantedBy = multi-user.target

Thanks

havoc

Cron job for on reboot.

Can't think of a good way to do on shutdown though. Most stuff gets killed pretty fast on shutdown command being issued. If you have a 2nd machine you could just watch till the machine goes down I guess via ping

Bochi

Maybe another approach could be defining your script as alias for shutdown, trigger your API call there and then hand off the further processing to the "real binary"?

aeg

My guess would be the ExecStop is getting called when network-online goes away. If you must use systemd, I would suggest you have one unit file with ExecStart=maintenance-on.sh before reboot.target, and a second unit file with ExecStart=maintenance-off.sh after network-online.target.

However, I would also recommend that before reboot, you make an API call that disables monitoring for 5 minutes instead of turning it off entirely. Otherwise you will end up with a situation where the instance fails to come back up properly after a reboot and your monitoring happily ignores it because the startup script never ran to turn monitoring back on.

berkay

I’d just create an alias for the shutdown script, and a cron entry for boot up script as suggested before.

nfn

Yes, a cron @reboot entry and a function/alias should be an easier solution

Thanks for you feedback