Common CentOS7 system commands

My personal work is summarized for your reference. if anything is wrong, please point out and thank you. View all network card IP Addresses & mdash; ipaddr start firewall & mdash; systemctlstartfirewalld. service stop firewall & mdash; systemctlst

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