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Installation : What are Daemons? In the *nix environment, we call the things that handle the system as Daemons. Simply every process is assigned with a daemon and that daemon will handle the transactions in the system. For example the Apache Handler or the thing that makes it possible for you to stream webpages from your server is called the httpd (HTTP Daemon) There are several other daemons in your system, like the sshd which handles your SSH logins. From here it is important to know that sometimes you amy want to start up or shut down specific services on your system. Below is an example on how to start, stop or restart your Apache Daemon. To restart an already active daemon process. /etc/rc.d/init.d/httpd restart To stop an already active daemon process. /etc/rc.d/init.d/httpd stop To start an already stopped daemon process. /etc/rc.d/init.d/httpd start On other occasions, you may have noticed that some of your processes do not start up when you reboot and it is very unconvient that you have to restart every process over and over again when you have to reboot your system. Below is the command using mysql as an example on how to set the system to restart a specific Daemon automatically on reboot. chkconfig –level 2345 mysql on
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