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Johannes Ernst
Asked: 2020-10-10 13:41:16 +0800 CST

What does systemd "thawing" mean?

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From systemctl status foo. I have both a foo.service and a foo.timer:

Active: activating (auto-restart) (thawing) since Fri 2020-10-09 21:32:56 UTC; 3min 1s ago

I can't find the word "thaw" anywhere in the docs. This is systemd 246.6.

systemd

1 Answers

  1. It means the same thing that is in your description i.e.activating. Thaw is needed to unfreeze a unit. Freeze means suspending all the process contained in a cgroup corresponding to a unit. This is usually done to save resource. So whenever we want the unit back, it is thawed. systemd has control over units so it handles freeze and thaw depending on task. Although a user can manually also issue freeze on a unit and then thaw it.

    systemctl freeze [pattern]

    and then

    systemctl thaw [pattern]

    Check journalctl for the debug logs. Quick tip : Don't run on a unit that is running your system.

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