How do I assign a static hostname to an Amazon EC2 instance that runs RHEL 5 or 6, CentOS 5 or 6, or Amazon Linux?

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I changed the hostname of my Amazon Elastic Compute Cloud (Amazon EC2) instance. However, when I reboot or stop and then start the instance, the hostname changes back to the original hostname.

Short description

To make a hostname persist when you reboot or stop and start your EC2 instance, add the hostname to the instance's relevant configuration files.

The following steps apply to Amazon Linux and RHEL 5 or 6, and CentOS 5 or 6. For instructions that apply to other distributions, see the following resources:

Important: RHEL 5 or 6 and CentOS 5 or 6 are end of life (EOL) distributions. This means that they no longer receive active support, such as security updates. It's a best practice to use operating system distributions that still receive regular updates.

Resolution

  1. Open /etc/sysconfig/network in vim:

    sudo vim /etc/sysconfig/network
  2. Change the value of the HOSTNAME parameter (replace persistent_hostname with your preferred hostname):

    HOSTNAME=persistent_hostname
  3. Set NETWORKING to yes:

    NETWORKING=yes
  4. Save and exit the vim editor.

    Note: After making this change, press SHIFT + : to open a new command entry box in the vim editor. Type wq, and then press Enter to save your changes and exit vim.

  5. Open /etc/hosts in vim:

    sudo vim /etc/hosts
  6. Change the entry beginning with 127.0.0.1 to the following, replacing persistent_hostname, localdomain, and localhost with your preferred hostname, local domain, and localhost:

    127.0.0.1 persistent_hostname.localdomain localhost localhost.localdomain
  7. Save and exit the vim editor.

  8. To verify that you successfully changed the hostname, reboot your instance, and then run the hostname command:

    sudo reboot
    hostname

    The command returns the new hostname.

Related information

Change the hostname of your Amazon Linux instance

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AWS OFFICIALUpdated 10 months ago