What is Chkconfig in Linux?

chkconfig command is used to list all available services and view or update their run level settings. In simple words it is used to list current startup information of services or any particular service, updating runlevel settings of service and adding or removing service from management.

How do I add Httpd to Chkconfig?

Add httpd Service

If you want to add httpd system service under chkconfig management then you need to use chkconfig –add httpd command as shown below. –add : this option will add the service under chkconfig management. After adding the service, you can verify the service list using chkconfig –list httpd command .

How do I run Chkconfig on CentOS 7?

chkconfig Command Examples for Red Hat and CentOS

  1. Pre-Flight Check. …
  2. View Full List of Services Using chkconfig. …
  3. View Full List of Services That Start at Boot (Normally, Runlevel 3) …
  4. Turn On a Service for the Default Run Levels (2,3,4,5) …
  5. Turn Off a Service for the Default Run Levels (2,3,4,5)

How enable and disable services in Linux?

The traditional way to start services in Linux was to place a script in /etc/init. d , and then use the update-rc. d command (or in RedHat based distros, chkconfig ) to enable or disable it. This command uses some mildly complicated logic to create symlinks in /etc/rc#.

What are the two most commonly used runlevels?

Runlevels 2 and 4 are used for user defined runlevels and runlevel 0 and 6 are used for halting and rebooting the system.

How do I use Chkconfig?

This article contains 7 practical examples that explains how to use the chkconfig command.

  1. Check Service Startup status from Shell Script. …
  2. View Current Status of Startup Services. …
  3. Add a new Service to the Startup. …
  4. Remove a Service From Startup List. …
  5. Turn-on or Turn-off a Service for a Selected Run Level.

How do I start httpd service?

You can also start httpd using /sbin/service httpd start . This starts httpd but does not set the environment variables. If you are using the default Listen directive in httpd. conf , which is port 80, you will need to have root privileges to start the apache server.

How do I enable Chkconfig?

To get a list of which services are started at which run level, use the command “chkconfig –list“. # chkconfig –list acpid 0:off 1:off 2:on 3:on 4:on 5:on 6:off auditd 0:off 1:off 2:on 3:on 4:on 5:on 6:off blk-availability 0:off 1:on 2:on 3:on 4:on 5:on 6:off cgconfig 0:off 1:off 2:off 3:off 4:off 5:off 6:off …

What is Systemctl in Linux?

systemctl is used to examine and control the state of “systemd” system and service manager. … As the system boots up, the first process created, i.e. init process with PID = 1, is systemd system that initiates the userspace services.

What are the run levels in Linux?

A runlevel is an operating state on a Unix and Unix-based operating system that is preset on the Linux-based system.


Runlevel 0 shuts down the system
Runlevel 1 single-user mode
Runlevel 2 multi-user mode without networking
Runlevel 3 multi-user mode with networking
Runlevel 4 user-definable

How do I enable Systemctl?

Enabling and Disabling Services

To tell systemd to start services automatically at boot, you must enable them. To start a service at boot, use the enable command: sudo systemctl enable application. service.

Is Chkconfig deprecated?

From our previous experience of CentOS/RedHat, we all knew that “ chkconfig“ command is used for checking and updating runlevel information for system services. These legacy commands are still included in CentOS 7 for backwards compatibility, but that will be obsolete in future releases.

Like this post? Please share to your friends:
OS Today