Basic chkconfig Command Examples in Linux
This is our ongoing Linux command series where we are going to review how we can usechkconfigcommand efficiently with it’s available parameters. TheChkconfigcommand tool allows to configure services start and stop automatically in the/etc/rd.d/init.dscripts through command line. Let’s see some examples.
1. List All Services
Using ‘–list‘ parameter will displayed all services and their current start-up status in each run-level configuration.
[root@tecmint ~]# chkconfig --list NetworkManager 0:off 1:off 2:on 3:on 4:on 5:on 6:off abrt-ccpp 0:off 1:off 2:off 3:on 4:off 5:on 6:off abrt-oops 0:off 1:off 2:off 3:on 4:off 5:on 6:off ...
2. Check Status of Specific Service
Below command shows startup configuration for a particular service. It’s showingHTTPservices are turnedoffin all run levels.
[root@tecmint ~]# chkconfig --list | grep httpd httpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
3. How Do I Start a Particular Service on Run Levels
The following ‘chkconfig‘ command shows how we can startHTTPservices only on run level3and5with ‘–level‘ parameter. First command startshttpdservices on run level3and5and second command verifies the status ofhttpdservices running on run level.
[root@tecmint ~]# chkconfig --level 35 httpd on
[root@tecmint ~]# chkconfig --list | grep httpd httpd 0:off 1:off 2:off 3:on 4:off 5:on 6:off
4. How to Check Which Services are On/Off
The following command will display all the services which areOnandOffin specific run level5.
[root@tecmint ~]# chkconfig --list | grep 5:on NetworkManager 0:off 1:off 2:on 3:on 4:on 5:on 6:off abrt-ccpp 0:off 1:off 2:off 3:on 4:off 5:on 6:off abrt-oops 0:off 1:off 2:off 3:on 4:off 5:on 6:off abrtd 0:off 1:off 2:off 3:on 4:off 5:on 6:off acpid 0:off 1:off 2:on 3:on 4:on 5:on 6:off ...
[root@tecmint ~]# chkconfig --list | grep 5:off dnsmasq 0:off 1:off 2:off 3:off 4:off 5:off 6:off dovecot 0:off 1:off 2:off 3:off 4:off 5:off 6:off firstboot 0:off 1:off 2:off 3:off 4:off 5:off 6:off kdump 0:off 1:off 2:off 3:off 4:off 5:off 6:off mysqld 0:off 1:off 2:off 3:off 4:off 5:off 6:off netconsole 0:off 1:off 2:off 3:off 4:off 5:off 6:off nfs 0:off 1:off 2:off 3:off 4:off 5:off 6:off ...
5. How Do I Stop a Particular Service on Run Levels
The following command will turnedOffa service calledpostfixfor a just single run level. Similarly, we can turnOffa particular service in multiple run levels in one go as shown under.
[root@tecmint ~]# chkconfig --level 3 postfix off
[root@tecmint ~]# chkconfig --level 2345 postfix off
As we all know, there are seven run levels are available on Linux Operating System. We’ll cover the significant of different run levels and booting sequence in details in our upcoming article. So, please stay tuned.