Shulou(Shulou.com)06/02 Report--

Background introduction

Why modify the host name? Suppose we have multiple CentOS servers, and each server runs this different service role. If the host name is the same, we may appear in the production environment and cause service downtime due to improper operation. Then, the impact is unpredictable. Let's teach friends to change the host name.

Modification method

Centos 6.6 change the host name

Temporarily modify the host name

[root@localhost ~] # hostname 192168088102-NFS-Server

# log in to the Linux system again after logging out, and the host name has changed. However, the host name of the restart system will become invalid.

[root@192168088102-NFS-Server ~] # hostname

192168088102-NFS-Server

Edit the vi / etc/hosts file, add "192168088102-NFS-Server" at the end of the line, notice the space, and change it to the desired host name.

[root@localhost ~] # cat / etc/hosts

127.0.0.1 localhost.localdomain localhost.localdomain localhost4 localhost4.localdomain4 localhost 192168088102-NFS-Server

: 1 localhost.localdomain localhost.localdomain localhost6 localhost6.localdomain6 localhost 192168088102-NFS-Server

Edit the vi / etc/sysconfig/network file

# replace part of the localhost.localdomain with the new host name

[root@localhost ~] # cat / etc/sysconfig/network

NETWORKING=yes

HOSTNAME=localhost.localdomain

# effective after restart

[root@localhost ~] # reboot

[root@192168088102-NFS-Server ~] # hostname

192168088102-NFS-Server

Centos 7.6 change host name

Temporarily modify the host name

[root@localhost ~] # hostname 192168088102-NFS-Server

[root@localhost ~] # hostname

192168088102-NFS-Server

# Log in again after logging out, and the host name has been temporarily modified successfully

[root@192168088102-NFS-Server ~] # hostname

192168088102-NFS-Server

Permanently modify the host name

Method 1:

Hostnamectl set-hostname ${Host name to be set}

[root@localhost ~] # hostnamectl set-hostname 192168088102-NFS-Server

[root@localhost ~] # reboot

Method 2:

Edit the / etc/hostname file and add the host name as 192168088102-NFS-Server

[root@localhost ~] # cat / etc/hostname

192168088102-NFS-Server

[root@localhost ~] # reboot

After rebooting the system, the host name is 192168088102-NFS-Server

Reminder:

After modifying the host name, use ping ${newly changed host name} to see if you can ping, and whether the returned result is the current host IP. If so, it is normal. Otherwise, you need to add local domain name resolution.

Vi / etc/hosts

Add a line 192.168.88.102 192168088102-NFS-Server

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