New acquaintance with Linux, simple configuration

For beginners, it is best to turn off the firewall and selinux after the operating system is installed. Today, I will briefly show you how to configure it.

Various unit types of systemd

Sysvinit run level

Several common types of control

Start (startup): run the specified system service program to realize the service function

Stop (stop): terminates the specified system service program and shuts down the corresponding function

Restart (restart): exit first, and then rerun the specified system service program

Reload (overload): does not quit the service program, but just refreshes the configuration, which is the same as restart in some services

Status (View status): view the running status and related information of the specified system service

View the target of the system

Because I am a graphic character switch, I can switch between init 3 and 5 3.

[root@centos ~] # init 0 / / shut down the current system

[root@centos ~] # init 6 / / restart the current system

Or

[root@centos ~] # systemctl poweroff / / shut down the current system

[root@centos ~] # systemctl reboot / / restart the current system

Use the systemctl tool

Systemctl control options common options for service names are as follows:

Enable: power on and start automatically

Disable: power on and shut down automatically

Is-enable: check boot status

[root@centos ~] # systemctl enable service name

[root@centos ~] # systemctl disable service name

[root@centos ~] # systemctl is-enable service name