systemd switched-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:
--deserializeis used to restore saved internal state that a previous invocation ofsystemd,exec()ing this one, has written out to a file. Its option argument is an open file descriptor for that process.--switched-rootis used to tell this invocation ofsystemdthat it has been invoked fromsystemdmanaging 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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