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A Linux system can run in different levels, depending on the capabilities you want to give it. For example, you can run your system at an administrative level, locking out user access. Normally, full operations are activated by simply running your system at a certain level of operational capability, such as supporting multiuser access or graphical interfaces. These levels (also known as states or modes) are referred to as runlevels, the level of support that you are running your system at.
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A Linux system has several runlevels, numbered from 0 to 6. When you power up your system, you enter the default runlevel. Runlevels 0, 1, and 6 are special runlevels that perform specific functions. Runlevel 0 is the powerdown state and is invoked by the halt command to shut down the system. Runlevel 6 is the reboot state it shuts down the system and reboots. Runlevel 1 is the single-user state, which allows access only to the superuser, and does not run any network services. This enables you, as the administrator, to perform administrative actions without interference from others. Other runlevels reflect how you want the system to be used. Runlevel 2 is a partial multiuser state, allowing
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access by multiple users, but without network services like NFS or xinetd (eXtended InterNET services daemon). This level is useful for a system that is not part of a network. Both runlevel 3 and runlevel 5 run a fully operational Linux system, with multiuser support and remote file sharing access. They differ in terms of the interface they use. Runlevel 3 starts up your system with the command line interface (also known as the text mode interface). Runlevel 5 starts up your system with an X session, running the X Window System server and invoking a graphical login, using display managers, such as gdm or xdm. If you choose to use graphical logins during installation, runlevel 5 will be your default runlevel. Linux provides two keyboard sequences to let you switch between the two during a login session: CTRL-ALT-F1 changes from the graphical interface (runlevel 5) to the command line interface (runlevel 3) and CTRL-ALT-F7 changes from the command line interface to the graphical interface. The runlevels are listed in Table 1-3. Changing runlevels can be helpful if you have problems at a particular runlevel. For example, if your video card is not installed properly, then any attempt to start up in runlevel 5 will likely fail, as this level immediately starts your graphical interface. Instead you should use the command line interface, runlevel 3, to fix your video card installation.
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TIP You can use the single-user runlevel (1) as a recovery mode state, allowing you to start up your system without running startup scripts for services like DNS. This is helpful if your system hangs when you try to start such services. Networking is disabled, as well as any multiuser access. You can also use linux s at the boot prompt to enter runlevel 1. If you want to enter the single-user state and also run the startup scripts, you can use the special s or S runlevels.
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When your system starts up, it uses the default runlevel as specified in the default init entry in the
Basic System Administration
State System Runlevels (states) 0 1
Description
Halt (do not set the default to this level); shuts down the system completely. Administrative single-user mode; denies other users access to the system, but allows root access to the entire multiuser file system. Startup scripts are not run. (Use s or S to enter single-user mode with startup scripts run.) Multiuser, without network services like NFS, xinetd, and NIS (the same as 3, but you do not have networking). Full multiuser mode with login to command-line interface; allows remote file sharing with other systems on your network. Also referred to as the text mode state. Unused. Full multiuser mode that starts up in an X session, initiating a graphical login; allows remote file sharing with other systems on your network (same as 3, but with graphical login).
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6 Table 1-3.
Reboots; shuts down and restarts the system (do not set the default to this). System Runlevels (states)
/etc/inittab file. For example, if your default init runlevel is 5 (the graphical login), the default init entry in the /etc/inittab file would be init:5:default:
You can change the default runlevel by editing the /etc/ 1 inittab file and changing the init default entry. Editing the /etc/inittab file can be dangerous. You should do 1 this with great care. As an example, if the default runlevel is 3 (command line), the entry for your default runlevel in the /etc/inittab file should look like the following: 1 id:3:initdefault:
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