Edit the Host File and Set the Hostname

To edit the host file and set the hostname, perform the following steps:

Edit the Host File

Using a text editor, open the host's file on every host in your cluster.

For example: vi /etc/hosts

Add a line for each host in your cluster. The line must consist of the IP address and the FQDN.

For example:

Bash
    
 
1.2.3.4 <fully.qualified.domain.name>
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Do not remove the following two lines from your host file. Removing or editing the following lines may cause various programs that require network functionality to fail.

Bash
    
 
127.0.0.1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6
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Set the Hostname

Confirm that the hostname is set by running the hostname -f command.

This must return the <fully.qualified.domain.name> you just set.

To set the hostname on each host in your cluster, use the following command:

Bash
    
 
hostnamectl set-hostname <fully.qualified.domain.name>
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Last updated on Aug 15, 2025

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