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
chkconfig httpd on
This will enable apache22 to start at boot.
To get more deeply into it, you can look at /etc/rc.d/rc.3. You’ll see a bunch of symbolic links beginning with either k or s. Those with s are started at boot in runlevel 3.
So I get that S links are started in run level 3, but what significance do the numbers have?
I assume it has something to do with the order they start up?