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I have an ArchLinux installation with systemd. I am trying to run a hook immediately after my encrypted data device is mounted in order to put flashcache on top of it. I have scripts that work, however I cannot make them load in right order. Here's what I did:

file: /usr/lib/systemd/system/flashcache.service

[Unit] Description=FlashCache [email protected] [Service] Type=oneshot RemainAfterExit=no ExecStart=/usr/local/bin/flashcache_startup_script [Install] WantedBy=dev-mapper-data_cached.device

After creating file, I ran systemctl enable flashcache.service.

However, on boot it does not start, the dev-mapper-data_cached times out, after which I can get into a root shell and run flashcache_startup_script manually.

I examined output of journalctl -b, and determined that FlashCache service does not load before timeout occurs.

Another option I tried without success is Requires=dev-mapper-vg1-data.device

What am I doing wrong?

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I tried all sorts of things, mainly using following resource. I am not exactly sure why it worked, but following unit file solved the issue:

[Unit] Description=FlashCache BindsTo=dev-vg1-data.device After=dev-vg1-data.device DefaultDependencies=no [Service] Type=oneshot RemainAfterExit=no ExecStart=/usr/local/bin/flashcache_startup_script [Install] WantedBy=sysinit.target
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