Common CentOS7 system commands

Common CentOS7 system commands

My personal work is summarized for your reference. If anything is wrong, please point out and thank you.

View All Nic ip addresses -- ip addr

Start firewall -- systemctl start firewalld. service

Stop firewall -- systemctl stop firewalld. service

Disable firewall startup -- systemctl disable firewalld. service

List the running service status-systemctl

Start a service --systemctl start postfix.service

Close a service --systemctl stop postfix.service

Restart a service :--systemctl restart postfix.service

Display the status of a service --systemctl status postfix.service

Enable a service at startup --systemctl enable postfix.service

Disable a service at startup --systemctl disable postfix.service

Check whether the service is started --systemctl is-enabled postfix.service;echo $?

View the list of started services --systemctl list-unit-files|grep enabled

Set the system default startup running level 3 --ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target

Set the system default startup running level 5 --ln -sf/lib/systemd/system/graphical.target/etc/systemd/system/default.target