Automatically import/export pool on startup/shutdown?

OpenZFS
1

Hello, I multi-boot, I have a 3 diskz1 pool with basically my local data that I have been sharing between some Void installations using

/etc/rc.local

#!/bin/sh
# Default rc.local for void; add your custom commands here.
#
# This is run by runit in stage 2 before the services are executed
# (see /etc/runit/2).
zpool import lagoon

&

/etc/rc.shutdown

#!/bin/sh
# Default rc.shutdown for void; add your custom commands here.
#
# This is run by runit in stage 3 after the services are stopped
# (see /etc/runit/3).
zpool export lagoon

How would I do this in systemd distributions? Debian, Ubuntu, Mint, CachyOS etc?

I have found you can start a script with roots crontab, but what about the shutdown-export side?

2

From Ben Cotton’s article at How to run commands at shutdown on Linux | Opensource.com :

Turns out, it’s much simpler with systemd. All you have to do is put your script in /usr/lib/systemd/system-shutdown/, which is handled by systemd-halt.service. Of course, if you need to manage dependencies in a particular order (e.g., you can’t post a tweet if the network stack is down), then you can write a systemd service unit file. For example:

[Unit]
Description=Run mycommand at shutdown
Requires=network.target
DefaultDependencies=no
Before=shutdown.target reboot.target

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/bin/true
ExecStop=mycommand

[Install]
WantedBy=multi-user.target
1 Like
3

sudo crontab -e

@reboot zpool import lagoon

sudo vim /usr/lib/systemd/system-shutdown/lagoon_Export

#!/bin/sh
zpool export lagoon

sudo chmod +x lagoon_Export

Super easy, barely an inconvenience!

Thank you this is working perfectly, reboot to another distribution and my data is automagically right there as well. No manual export required.

1 Like