Running commands and shell scripts on startup/boot

Do you need to run a set of commands or a shell script on CentOS / RHEL / Fedora startup?  The easiest way to start a script upon boot is by adding the command to /etc/rc.local (a symbolic link to /etc/rc.d/rc.local).  /etc//rc.local is a script executed after the initial startup services have been executed.

Here’s an example of the /etc/rc.local script:

#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.
touch /var/lock/subsys/local

Auto start services on startup/boot

To auto start services in Centos or Redhat OS, you can use builtin chkconfig utility. It is located in /sbin directory. If you are a regular user (non-root), then /sbin may not be in your path. Therefore, you may have to use the full path to access the chkconfig utility.

To auto start a new service:

• Find out the name of service’s script from /etc/init.d/ directory e.g. mysqld or httpd
• Add it to chkconfig
  
  sudo /sbin/chkconfig –add mysqld
• Make sure it is in the chkconfig.
  
  sudo /sbin/chkconfig –list mysqld
• Set it to autostart
  
  sudo /sbin/chkconfig mysqld on

To stop a service from auto starting on boot

• sudo /sbin/chkconfig mysqld off