Systemd unit file for swapon does not run on boot

Question

I have a systemd unit file that does swapon, but it doesn't seem to run on each boot even though it's enabled.

Here are the contents of my swapon.service:

[Unit]
Description=Turn on swap

[Service]
Type=oneshot
Environment=SWAPFILE=/swapfile-1GB
ExecStartPre=-/usr/bin/dd if=/dev/zero of=${SWAPFILE} bs=1024 count=1048576
ExecStartPre=-/sbin/mkswap ${SWAPFILE}
ExecStart=/sbin/swapon ${SWAPFILE}

[Install]
WantedBy=local.target

This should optionally create the file and make it into a swapfile optionally if it hasn't been done yet, then run swapon on it. It's enabled, but doesn't run on boot; I manually have to run sudo systemctl start swapon which does work.

How do I get it to run on boot?

It's listed and marked as "enabled" when I list all the units — Attila Szeremi
– Attila Szeremi, Commented Mar 21, 2016 at 9:46

Attila Szeremi · Accepted Answer · 2016-03-21 09:51:13Z

0

I fixed this by changing local.target at the end to swap.target

answered Mar 21, 2016 at 9:51

Attila Szeremi

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Gregg Leventhal · Accepted Answer · 2021-09-30 22:24:24Z

0

FWIW, there is a swap unit that can be used to control swapfile activation:


[Swap]
What=/swapfile

(etc)

answered Sep 30, 2021 at 22:24

Gregg Leventhal

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