Recreating ddclient Cache to Update New IP Address on Domain Name Registrar

This document is intended for those who are experiencing problems with updating a newly assigned IP address of a web server by using ddclient.

This article is intended for system administrators who experience problems with updating a newly assigned IP address of a web server by using ddclient.

Overview

After power cycling, unplugging, or otherwise cutting power to a router, its public IP address will change. If you’re self-hosting a web server, you’ll need to send your public IP address to your domain name registrar for your server to be online.

On a Linux-based server, ddclient automatically updates and sends the server’s IP address to the domain name registrar. This client runs in the background of the server and bridges the connection between the server and domain name registrar.

Problems updating with ddclient

When sending an updated IP address to the domain name registrar, the ddclient may not properly obtain the IP address. In such case, your website will not be accessible. This error occurs usually after applying other changes to ddclient or Nginx after your ISP has assigned you a new IP address.

If your server is offline, open Terminal and run the following:

sudo ddclient -daemon=0 -debug -verbose -noquiet

This will forcibly obtain the new IP address and send it to the domain name registrar. The following message will appear, stating that the IP address has already been set, regardless of whether the update was successful or not.

Updating IP address via ddclient

If the IP address in the administrator panel is different from the one that ddclient obtained, the ddclient cache may be causing the problem. Recreating the ddclient should fix the problem.

Resolving the problem

To recreate the ddclient cache:

1. Open Terminal, and then stop Nginx and ddclient:

sudo systemctl stop nginx
sudo systemctl stop ddclient

2. Remove the ddclient.cache file:

sudo rm /var/cache/ddclient/ddclient.cache

3. Confirm that the ddclient.cache file no longer exists in the /var/cache/ddclient/ directory.

4. Start Nginx and ddclient:

sudo systemctl start nginx
sudo systemctl start ddclient

5. Force ddclient to obtain the new IP address and send the IP address to the domain name registrar:

sudo ddclient -daemon=0 -debug -verbose -noquiet

6. Confirm that a new ddclient.cache file exists in the /var/cache/ddclient/directory.

Your website should now be online. In some cases, the server may take up to 30 minutes to process these changes. To confirm the connection between your server and domain name registrar, check that the IP address in the administrator panel of your domain name registrar matches the IP address ddclient obtained from your router.

If following the steps above don’t resolve the issue, reboot your server. If the problem persists, check the configurations in the administrator panel of your domain name registrar, router settings, and firewall settings on your router and Raspberry Pi.

 

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