# What Can I Do If hostname of the Production Site Server and DR Site Server Are Different After a Planned Failover or Failover?

#### Symptom

Users have changed hostname of the production site server before they perform a planned failover or failover for the first time. After the planned failover or failover, users start the DR site server and find that hostname of the DR site server is not updated accordingly.

#### Possible Causes

For Linux servers, if you have changed hostname of the production site server before you perform a planned failover or failover for the first time, this modification will not synchronize to the DR site server.

#### Prerequisites

- The production site server is a Linux server with Cloud-Init installed.
- hostname of the production site server has been changed.

#### Solution 1 (If You Have Not Performed a Planned Failover or Failover)

Set preserve_hostname: false to preserve_hostname: true in the Cloud-Init configuration file /etc/cloud/cloud.cfg to ensure that hostname of the production site server and DR site server are the same after you enable protection.

The procedure is as follows:

1. Log in to the production site server.
2. Run the following command to edit the /etc/cloud/cloud.cfg configuration file:

   sudo vim /etc/cloud/cloud.cfg

3. Modify preserve_hostname.
   - If preserve_hostname: false is already available in the /etc/cloud/cloud.cfg configuration file, change it to preserve_hostname: true.
   - If preserve_hostname: false is unavailable in the /etc/cloud/cloud.cfg configuration file, add preserve_hostname: true before cloud_init_modules.
4. Perform a planned failover or failover.

   After the planned failover or failover, hostname of the DR site server and production site server are the same.

#### Solution 2 (If You Have Performed a Planned Failover or Failover)

If you have not modified configuration file /etc/cloud/cloud.cfg before the planned failover or failover, log in to the DR site server and manually change hostname of the DR site server to that of the production site server.

Parent topic: FAQs