linux run level of 7

linux operating seven levels, respectively, from init 0 to init 6.

init 0: off state, the default level is not set to 0, otherwise it will automatically shut down a boot

init 1: single-user mode, root privileges, will be used when the general system maintenance, remote login can not only locally

init 2: multi-user mode without NFS and network support, saying that white is not online init 3

init 3: Complete multi-user text mode with NFS and network, logging into the console command line mode (most common)

init 4: futile mode, do not ignore it ......

init 5: graphical interface, more beautiful, but the memory consumption

init 6: Restart, the default level can not be set to 6, or a boot will automatically restart

More important level: 0,6 (shutdown and restart when used) and 3,5, so keep that in the first four levels enough to use