Two things you need to know: 1) Systemd boots towards the target given by "default.target". This is typically a symbolic link to the actual target file. 2) Systemd keeps it's targets in /lib/systemd/system and /etc/systemd/system. A file in /etc…
一.centos默认运行级别 下面是linux的默认运行级别.vim /etc/inittab即可查看. # Default runlevel. The runlevels used are: # - halt (Do NOT set initdefault to this) # - Single user mode # - Multiuser, without NFS (The same as , if you do not have networking) # - Full multiuse…