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：
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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systemd --switched-root --deserialize 参数说明
原文：http://dangzhiqiang.blog.51cto.com/7961271/1958615