LinuxQuestions.org - Init process

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- - Init process (https://www.linuxquestions.org/questions/linux-newbie-8/init-process-4175651305/)

Hi,

Can anyone please guide me how the init process work? I inderstand that first it will read /etc/inittab to find the system run level. What will happen next?

Code:

[krishnar@ip-172-26-5-82]/etc% ll | grep  'init\|rc'

-rw-r--r--  1 root root    2681 Sep 10  2014 bashrc

-rw-r--r--  1 root root    1602 Sep 10  2014 csh.cshrc

drwxr-xr-x  2 root root    4096 Jan 20 02:58 init

lrwxrwxrwx  1 root root      11 Aug 11  2018 init.d -> rc.d/init.d

-rw-r--r--  1 root root    884 Aug 17  2017 inittab

-rw-r--r--  1 root root    942 Jan 12  2010 inputrc

-rw-r--r--  1 root root    8510 Apr  1  2016 nanorc

lrwxrwxrwx  1 root root      7 Aug 11  2018 rc -> rc.d/rc

lrwxrwxrwx  1 root root      10 Aug 11  2018 rc0.d -> rc.d/rc0.d

lrwxrwxrwx  1 root root      10 Aug 11  2018 rc1.d -> rc.d/rc1.d

lrwxrwxrwx  1 root root      10 Aug 11  2018 rc2.d -> rc.d/rc2.d

lrwxrwxrwx  1 root root      10 Aug 11  2018 rc3.d -> rc.d/rc3.d

lrwxrwxrwx  1 root root      10 Aug 11  2018 rc4.d -> rc.d/rc4.d

lrwxrwxrwx  1 root root      10 Aug 11  2018 rc5.d -> rc.d/rc5.d

lrwxrwxrwx  1 root root      10 Aug 11  2018 rc6.d -> rc.d/rc6.d

drwxr-xr-x 10 root root    4096 Aug 11  2018 rc.d

lrwxrwxrwx  1 root root      13 Aug 11  2018 rc.local -> rc.d/rc.local

lrwxrwxrwx  1 root root      15 Aug 11  2018 rc.sysinit -> rc.d/rc.sysinit

Code:

[krishnar@ip-172-26-5-82]/etc% cat inittab | grep -v #

id:3:initdefault:

[krishnar@ip-172-26-5-82]/etc%

Any help would be appreciated!

This seems to have lots of good information.

Just as a frame of reference what distribution/version are you running. From the output of the inittab i.e. a single line, the init system is upstart and 3 would indicate no GUI so probably RHEL/CentOS 6 or a really old version of Fedora. Except for CentOS 6 and as far as I know no other current distribution still uses upstart.

As posted by searching the internet you can find lots of information on SySV init which explains how the /etc/init.d,/etc/rcX.d directories and K/S start/stop scripts work.

http://www.linux-magazine.com/Online...hat-is-Upstart
https://www.digitalocean.com/communi...-how-to-use-it

http://www.yolinux.com/TUTORIALS/Lin...itProcess.html