Linux Boot start configuration

1. Write your own scripts or commands into the/etc/rc.local file. The specified script or command is started according to the file.

Example: I have a script:/root/usr/local/scripts/1234.sh

Then write it directly into the/etc/rc.local file to enable booting.

2. Using chkconfig MySQL on/off

3. Add a script or command to the/home/user/.bash_profile file. Scripts or commands loaded in. Bash_profile can only be started when single-user login is available. It is not started at Linux boot time.

attached: Chkconfig

The Chkconfig command is primarily used to update (start or stop) and query run-level information for system services. Keep in mind that Chkconfig does not immediately automatically disable or activate a service, it simply changes the symbolic connection.

Use syntax:

chkconfig [--add][--del][--list][system service] or Chkconfig [--level < class Code >][system service][on/off/reset]

Parameter usage:

--add adds the specified system service, allows the CHKCONFIG directive to manage it, and adds relevant data to the system-initiated narrative file.

--del deletes the specified system service, is no longer managed by the Chkconfig directive, and deletes the relevant data within the system-initiated narrative file.

--level< Class code > Specify which execution level the system service should be opened or closed.

Level 0 means: shutdown

Level 1 means: Single user mode

Level 2: Multi-user command line mode with no network connection

Level 3 means: Multi-user command line mode with network connection

Level 4 means: not available

Level 5 means: Multi-user mode with graphical interface

Level 6 means: reboot

Examples of Use:

Chkconfig--list #列出所有的系统服务

Chkconfig--add httpd #增加httpd服务

Chkconfig--del httpd #删除httpd服务

Chkconfig--level httpd 2345 on #设置httpd在运行级别为2, 3, 4, 5 in the case of On (open) state

Chkconfig--list #列出系统所有的服务启动情况

Chkconfig--list mysqld #列出mysqld服务设置情况

Chkconfig--level mysqld on #设定mysqld在等级3和5为开机运行服务,--level 35 means that the operation is performed only on levels 3 and 5, on means start, off means off

Chkconfig mysqld on #设定mysqld在各等级为on, "each level" includes 2, 3, 4, 5 ratings

Linux Boot start configuration