How to change hostname in linux

How to modify the host name in Linux: 1. Change the value after HOSTNAME in the network to the host name you want to set; 2. Change localhost.localdomian in hosts to the host name you want to set. Can.

The operating environment of this tutorial: centos7 system, DELL G3 computer.

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Modify the host name under Linux system

Linux system installation After that, there will be a default host name. Here is the CentOS system as an example. The default host name is localhost.localdomain. For ease of use, we often need to modify the host name. The following demonstration shows how to permanently modify the host name

Step one:

Change the network file under /etc/sysconfig, enter vi /etc/sysconfig/network at the prompt, and then change the Change the value to the hostname you want to set.

Click button i to enter insert editing mode

Step 2:

Change the hosts file under /etc, enter vi /etc/hosts at the prompt, and then change localhost.localdomian to the host you want to set Name

The third step is to close the firewall:

Meaning: open all ports (80,443,22...), when the port number is 8001, the firewall will directly grab the port number, and ultimately the firewall needs to be closed

Command to close the firewall:

service iptables stop	Turn off the firewall
service iptables start	Start the firewall
service iptables status	View firewall status
service iptables restart	Restart the firewall

Icon of successful firewall shutdown:

Attached Turn off the firewall and start up:

chkconfig iptables off	Turn off the firewall and start up
chkconfig iptables --list	Check whether the firewall is completely turned off and start up

Step 4:

Reboot the virtual machine: reboot

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