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What is a runlevel?

April 26, 2017runlevel

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What is a runlevel?

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A runlevel is a number which indicates what “mode” you want to computer to boot into. For example, runlevel 5 is graphical mode, where runlevel 3 is text-only mode. Runlevel 1 is “single-user” mode, used for troubleshooting problems. There are three ways to change your runlevel: • While the Computer is Running: • Open a Terminal. • Become root: su – • Type: init number where number is the runlevel that you want to change to. You will then be switched into the new runlevel. • While You Are Booting the Computer: • When you first start your computer, the GRUB screen (where you choose your Operating System) appears. Select the Fedora that you want to boot into, but press the a key instead of pressing Enter. • You will see a line somewhat like the following: kernel /vmlinuz-2.6.9-1.667 ro root=LABEL=/ acpi=on rhgb quiet Add the number of your runlevel to the end of that line, and then press Enter. For example, to boot into text-only mode, the line would look like: kernel /vmlinuz-2.6.9-1.66