Introduction to service management under ubuntulinux

Linux has a running level, which is really not intuitive. it is actually what needs to be done under different circumstances. there are some rc * in/etc *. d directory. * It is a number ranging from 0 to 6. There is also a SS which is a service of the system. In 0-6, it indicates a different meaning. 0 indicates that the system is shut down, 6 is system restart, and 1-5 is all startup methods. 3 is a normal start, so we usually focus on 3. according to the documents from the Internet, these meanings have reached a running level in rp linux, which is really not intuitive. it is actually what needs to be done under different circumstances. there are some rc * in/etc *. d directory, * is some numbers, from 0 to 6, there is a S

S is some services of the system, and in 0-6, it indicates different meanings. 0 indicates system shutdown, 6 indicates system restart, and 1-5 indicates some startup methods. 3 is a normal start, so we usually focus on 3. according to the Internet documentation, these meanings are different in rpm package management linux systems. so here we only talk about Ubuntu

These directories indicate the programs to be executed under the corresponding circumstances. start with S, and kill. if it is lower-case s, k, it means not to run. you can disable this item by changing the prefix to lowercase.

A small program named sysv-rc-conf can be installed through sudo apt-get install sysv-rc-conf. this is a simple tool for configuring the ubuntu service, which is easy to use.

The file in the rc *. d directory is actually linked to the script in/etc/init. d.