


 Short description
------------------



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


**Note:** The following steps apply to RHEL 7 or CentOS 7. For instructions that apply to other distributions, see one of the following:


[Change the system hostname](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-hostname.html#set-hostname-system)


[How do I assign a static hostname to an Amazon EC2 instance running RHEL 5 or 6, CentOS 5 or 6, or Amazon Linux?](https://repost.aws/knowledge-center/linux-static-hostname-rhel-centos-amazon/) 


[How do I assign a static hostname to an Amazon EC2 instance running SLES?](https://repost.aws/knowledge-center/linux-static-hostname-suse)


[How do I assign a static hostname to an Amazon EC2 instance running Ubuntu Linux?](https://repost.aws/knowledge-center/linux-static-hostname)



 Resolution
-----------



1.    Run the [hostnamectl](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-hostname.html) command  from the shell to update the hostname of your RHEL 7 or CentOS 7 Linux instance. Replace **persistent-hostname** with the name you want the instance to use:





```plaintext
sudo hostnamectl set-hostname --static persistent-hostname
```



**Note:** Changing the hostname by using the **hostnamectl** command doesn't update the **/etc/hosts** file. However, if necessary, you can manually edit this file to add the new hostname.


2.    Use the vi text editor to update the **/etc/cloud/cloud.cfg** file on your RHEL 7 or CentOS 7 Linux instance. For general information about using the vi editor, run the command **info vi** from the command shell:


**Note:** For instances running RHEL 7.4 and above, skip this step.





```plaintext
sudo vi /etc/cloud/cloud.cfg
```



3.    Add the following string to the bottom of the **/etc/cloud/cloud.cfg** file to be sure that the new hostname is preserved between restarts and reboots:





```plaintext
preserve_hostname: true
```



Save and exit the vi editor.


4.    Run the **reboot** command to reboot the EC2 instance and associate the new hostname with the instance:





```plaintext
sudo reboot
```



5.    Run the Linux **hostname** command without any parameters to verify that the hostname change persisted:





```plaintext
hostname
```



The command returns the new hostname that you specified in step 1.


**Note:** If you install any system updates that affect the **/etc/hosts** file, the hostname file, or the [hostname utility](https://manpages.ubuntu.com/manpages/bionic/en/man1/hostname.1.html), then you must run these steps again. 





---








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.

Assign static hostnames to private EC2 instances on RHEL 7 or CentOS 7

How do I assign a static hostname to an Amazon EC2 instance running RHEL 7 or CentOS 7?

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How do I assign a static hostname to an Amazon EC2 instance running RHEL 7 or CentOS 7?

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