systemd --switched-root --deserialize 参数说明

Posted 2020-10-04

systemd --switched-root --deserialize的这两个参数是内部用的，用于源代码中，不对外提供接口。

详见：

https://lists.freedesktop.org/archives/systemd-devel/2013-September/013008.html

关于这两个参数的解释可见：

https://unix.stackexchange.com/questions/98128/what-are-the-systemd-command-line-options-switched-root-and-deserialize

These are intentionally undocumented internal parts of systemd. Very simply, therefore:

• --deserialize is used to restore saved internal state that a previous invocation of systemd, exec()ing this one, has written out to a file. Its option argument is an open file descriptor for that process.

• --switched-root is used to tell this invocation of systemd that it has been invoked from systemd managing an initramfs, and so should behave accordingly — including turning off some of the behaviour otherwise caused by --deserialize.

It‘s a good answer. To expand on this a bit: systemd running with --deserialize --switched-root essentially means systemd was also used in the initramfs. Nowadays this is pretty common, so those two options are to be expected in the command line of PID 1.

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