EmbLogic » boot https://www.emblogic.com/blog Embedded System and ARM Training Tue, 03 Mar 2020 13:00:06 +0000 en-US hourly 1 http://wordpress.org/?v=3.9.1 Linux Run Levels https://www.emblogic.com/blog/02/linux-run-levels/ https://www.emblogic.com/blog/02/linux-run-levels/#comments Tue, 02 Feb 2016 12:36:51 +0000 http://www.emblogic.com/blog/?p=13216 Continue reading →]]> Linux Run Levels
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Run Level    Description
0                    Halt
1                     Single-User mode
2                    Multi-user mode, usually without networking support
3                    Full multi-user mode with networking
4                    Unused
5                    Multiuser mode with networking and a graphical X window Session
6                    Reboot

- To change run level use init command

init run_level
- Most normal is run level 5 for graphical linux system.
- Level 1 is used for troubleshooting or emergency purpose.
- Most linux softwares start the network softwares at run level 3.
- What aplications work at Run level is determined by system by RC script.

]]> https://www.emblogic.com/blog/02/linux-run-levels/feed/ 0 Boot process of linux https://www.emblogic.com/blog/02/boot-process-of-linux/ https://www.emblogic.com/blog/02/boot-process-of-linux/#comments Tue, 02 Feb 2016 12:27:09 +0000 http://www.emblogic.com/blog/?p=13214 Continue reading →]]> The boot process of linux
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- After you turn on your Linux System, linux kernel loads into memory and runs.
- Firstly, it runs the init process.
- init program is usually located at /sbin/init.
- init process has PID 1.
- The init process then starts all other processes.
- The init process reads the /etc/inittab file during boot (This is outdated now).

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