IN THIS CHAPTER
Understanding the various Linux init services
Auditing Linux daemon-controlled services
Stopping and starting services
Changing the Linux server's default runlevel
The primary job of a Linux server system is to offer services to local or remote users. A server can provide access to Web pages, files, database information, streaming music, or other types of content. Name servers can provide access to lists of host computer or user names. Hundreds of these and other types of services can be configured on your Linux systems.
Ongoing services offered by a Linux system, such as access to a printer service or login service, are typically implemented by what is referred to as a daemon process. Most Linux systems have a method of managing each daemon process as a service using one of several popular initialization systems (also referred to as init systems). Advantages of using init systems include the ability to do the following: