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NotTheDr01ds
Asked: 2022-11-28 19:12:13 +0800 CST

Systemd in degraded state after enabling in WSL

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After enabling Systemd per this answer in Ubuntu 22.04, sudo systemctl status shows State: degraded.

Additionally:

$ sudo systemctl --failed

  UNIT                     LOAD   ACTIVE SUB    DESCRIPTION
● systemd-sysusers.service loaded failed failed Create System Users

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
1 loaded units listed.

How can I transition from degraded to running?

22.04

1 Answers

  1. Best Answer

    This is due to the current use of a symlink from /dev/shm to /run/shm in WSL. There are several related Github issues:

    Among other things, this will cause any Systemd service that makes use of LoadCredentials= to fail. This impacts several other services on other distributions, but systemd-sysusers is the only default service under Ubuntu 22.10, at least, to make use of this.

    The workaround, as documented in #8996, is to create a new Systemd service that corrects the problem before any other Systemd units make use of that shared memory device.

    sudo -e /etc/systemd/system/fix_wsl2_shm.service

    Add the following:

    [Unit]
Description=Fix the /dev/shm symlink to be a mount
DefaultDependencies=no
Before=sysinit.target
ConditionPathExists=/dev/shm
ConditionPathIsSymbolicLink=/dev/shm
ConditionPathIsMountPoint=/run/shm

[Service]
Type=oneshot
ExecStart=/usr/bin/rm /dev/shm
ExecStart=/bin/mount --bind -o X-mount.mkdir /run/shm /dev/shm

[Install]
WantedBy=sysinit.target

    sudo systemctl enable fix_wsl2_shm.service

    Exit Ubuntu, wsl --terminate <distro_name> (or wsl --shutdown), and restart.

    Confirm that sudo systemctl status now shows running. If not:

    • Confirm whether sudo systemctl status fix_wsl2_shm.service shows that the service was loaded.
    • Confirm whether findmnt /dev/shm shows that it is mounted, or if ls -ld /dev/shm shows that it is a symlink.
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