how to change the startup order of linux init scripts in Redhat, Centos

Question

From this changing How to change Linux services startup/boot order? changing the values of the symbolic links it is evident that startup order is changed.

In debian derivatives we use

update-rc.d apache2 defaults 20 80

Do we have similar command in Centos/Redhat and ?

if so what it is ?

and what should be possible changes in init scripts header ?

Note: I should use init system (not any systemd or upstart)

Which versions of the named OS are you referring to, it's important? — user9517, Feb 08 '16 at 10:22

Diamond · Accepted Answer · 2016-02-08T11:07:45.043

An alternative will be to change the line starting with # chkconfig: in the service init script directly. This is explained in the chkconfig(8) man page.

Runlevel Files

Each service which should be manageable by chkconfig needs two or more commented lines added to its init.d script. The first line tells chkconfig what runlevels the service should be started in by default, as well as the start and stop priority levels. If the service should not, by default, be started in any runlevels, a - should be used in place of the runlevels list. The second line contains a description for the service, and may be extended across multiple lines with backslash continuation.

For example, random.init has these three lines:
# chkconfig: 2345 20 80
# description: Saves and restores system entropy pool for \
#              higher quality random number generation.
This says that the random script should be started in levels 2, 3, 4, and 5, that its start priority should be 20, and that its stop priority should be 80. You should be able to figure out what the description says; the \ causes the line to be continued. The extra space in front of the line is ignored.

After changing the script, if you will need to run the chkconfig command (as root) with the reset option for that service. With "reset", chkconfig will automatically create start/stop symlinks in the configured run levels with given priorities.

Thanks for info, I was wondering can I use CHKCONFIG with Default-start and Default-stop — forum.test17, Feb 08 '16 at 10:56

Maxiko · Answer 2 · 2016-02-08T11:02:23.053

0

You can manually rename symlinks in your /etc/rcX.d directories to change boot order.

UPD: Under RHEL / CentOS you use command called ntsysv or chkconfig.

edited Feb 08 '16 at 11:02

answered Feb 08 '16 at 10:32

Maxiko

474
2
8

I know changing the symlinks works, but would like to know is there any other alternative – forum.test17 Feb 08 '16 at 10:36

score 0 · Answer 3 · edited Apr 13 '17 at 12:14

I would like add more details to above answer

in order to start the scrips especially in centos there is no such alternative like

update-rc.d

in Debain ,

Easiest way is to change the scripts manually as described here and e.g. code from /etc/init.d/postfix

#!/bin/bash
#
# postfix      Postfix Mail Transfer Agent
#
# chkconfig: 2345 80 30
# description: Postfix is a Mail Transport Agent, which is the program \
#              that moves mail from one machine to another.
# processname: master
# pidfile: /var/spool/postfix/pid/master.pid
# config: /etc/postfix/main.cf
# config: /etc/postfix/master.cf
#
# Based on startup script from Simon J Mudd <sjmudd@pobox.com>
# 25/02/99: Mostly s/sendmail/postfix/g by John A. Martin <jam@jamux.com>
# 23/11/00: Changes & suggestions by Ajay Ramaswamy <ajayr@bigfoot.com>
# 20/01/01: Changes to fall in line with RedHat 7.0 style
# 23/02/01: Fix a few untidy problems with help from Daniel Roesen.

### BEGIN INIT INFO
# Provides: postfix MTA
# Required-Start: $local_fs $network $remote_fs
# Required-Stop: $local_fs $network $remote_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: start and stop postfix
# Description: Postfix is a Mail Transport Agent, which is the program that
#              moves mail from one machine to another.
### END INIT INFO

how to change the startup order of linux init scripts in Redhat, Centos

3 Answers3