systemdswitched-root的deserialize参数有什么用

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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。

系统中可以通过ps命令来查看,为1号进程:

实例1:

root          1  0.0  0.4  45808  4092 ?        Ss   Aug22   0:02 /usr/lib/systemd/systemd --system --deserialize 15

实例2:

root          1  0.0  0.4 128096  4144 ?        Ss   Aug22   0:02 /usr/lib/systemd/systemd --switched-root --system --deserialize 21

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

  • --deserialize is used to restore saved internal state that a previous invocation of systemdexec()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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