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I have a somewhat complicated setup on my computer (a Chromebook) where in a kernel without an initial RAM disk is used to reboot into another kernel with an initial RAM disk using kexec. I have a systemd unit (?) file that successfully runs /etc/rc.local (as in it will be called), which is what I use to call kexec, but I need it to start after entries in fstab have been mounted. The first-stage kernel runs without any use of the display (I haven't figured out how to get it to do use the display), so I don't know if /etc/rc.local is being called before or after fstab entries have been mounted.

I copied the rc-local.service file from another place and it looks like this:

[Unit]
Description=/etc/rc.local Compatibility
ConditionPathExists=/etc/rc.local

[Service]
Type=forking
ExecStart=/etc/rc.local
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99

[Install]
WantedBy=multi-user.target

I hadn't noticed the SysVStartPriority until now and assume that value it's set to would make it run last, but when I swapped out my kexec kernel for the normal one (which boots straight with a display), I noticed that the logs or the console output said that that parameter was deprecated. So, I need to specify a After= parameter to control when rc.local runs. What is the systemd unit/service name that mounts fstab entries?

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You're looking for local-fs.target (for local filesystems) and remote-fs.target (for network filesystems). There are documented in the systemd.special manpage.

See also the RequiresMountsFor directive in systemd.unit.

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  • I thought it would end with .service. Why doesn't it? Commented Jun 7, 2017 at 20:15
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    @Melab well, because it's not a service. There are a bunch of different types of unit files, services are just one. There are also mount units (which is what your /etc/fstab gets turned into in systemd, or you can write them yourself), device units, automount units, socket units, and probably a few more I'm forgetting. Then there are target units, which are used mainly as dependency simplifications/abstractions: instead of depending on the potentially dozens of .mount units that give local filesystems, you just depends on local-fs.target. Commented Jun 7, 2017 at 22:27
  • @Melab you might want to start with the systemd.unit manpage. Or systemctl list-units --all Commented Jun 7, 2017 at 22:28

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