课程: Linux CentOS 7: Shells and Processes

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Introduction to system services

Introduction to system services - Linux教程

课程: Linux CentOS 7: Shells and Processes

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Introduction to system services

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- [Instructor] System services are processes that are started by the OS and sit in the background waiting to answer requests. These services might include web servers, file servers, mail servers, and others. In Linux, a system service is called a daemon, spelled D-A-E-M-O-N. The term demon was first used by programmers at MIT. They took the name from Maxwell's Daemon, a being from a thought experiment that constantly works in the background. Maxwell's daemon came from Greek mythology, where a daemon was a genius or deity and was regarded as a good spirit or angel. In this sense, Linux daemons are good spirits working in the background doing good deeds. The correct pronunciation of the Latin word daemon is daemon. However, it's common to pronounce Linux services daemon or daemon, and both are acceptable. For this course, I'll use the original pronunciation of daemon. Due to Linux services being named daemons, you will notice that a lot of Linux service names end with D, such as HTTPD…

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