Книга: Fedora™ Unleashed, 2008 edition

Changing Runlevels

Changing Runlevels

After making changes to system services and runlevels, you can use the telinit command to change runlevels on the fly on a running Fedora system. Changing runlevels this way enables system administrators to alter selected parts of a running system to make changes to the services or to put changes into effect that have already been made (such as reassignment of network addresses for a networking interface).

For example, a system administrator can quickly change the system to maintenance or single-user mode by using the telinit command with its S option, like this:

# telinit S

The telinit command uses the init command to change runlevels and shut down currently running services. The command then starts services for the specified runlevel; in this example, the single-user runlevel is the same as runlevel 2. The init command can be run only from a console, not from an xterm running in an X session.

After booting to single-user mode, you can then return to multiuser mode without X, like this:

# telinit 3

If you have made changes to the system initialization table itself, /etc/inittab, use the telinit command's q command-line option to force init to re-examine the table.

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