Troubleshooting DNS Resolving Issues with 'sudo Unable to Resolve Host DigitalOcean' Error

When attempting to run `sudo apt-get update` on your instance, you may encounter an error message indicating that it is unable to resolve the host digitalocean. This can be a frustrating experience, especially if you're trying to access critical services like MySQL or PHPMyAdmin. In this article, we'll explore possible DNS resolving issues and provide steps to troubleshoot and potentially resolve the problem.

Temporary DNS Server Addition

One common cause of DNS resolving issues is a change in your network configuration. This might include a new router or modem, reconfiguring a switch with a new setup, or even an update from your Internet Service Provider (ISP) not correctly forwarding internet naming (DNS) to internal or external DNS servers.

To temporarily bypass this issue, you can add a known DNS server to your system. This will allow you to access critical services like MySQL and PHPMyAdmin while you investigate the root cause of the problem.

Error Messages

When trying to run `sudo apt-get update`, you may see error messages indicating that there was a temporary failure resolving specific hosts, such as 'gb.'. These errors are usually accompanied by warnings about failed fetches, which can prevent your system from updating correctly.

Systemd Journal Log

The systemd journal log provides additional insight into the issue. It indicates that a start job for unit `rvice` has finished with a failure and that the process exited with an exit code of 1.

Potential Solutions

Before we dive deeper, it's essential to note that this error may be related to your instance's update from Ubuntu version 22.04.2. As such, you may want to investigate whether this is a known issue or if there are any patches available for resolution.

In the meantime, you can try commenting out the `query_cache_limit` line in the `/etc/mysql/my.cnf` file. This might help resolve connectivity issues with PHPMyAdmin and your Flask website.

DNS resolving issues can be frustrating to troubleshoot, especially when they prevent you from accessing critical services like MySQL or PHPMyAdmin. By temporarily adding a known DNS server to your system and investigating the systemd journal log, you may be able to identify and resolve the root cause of the problem. If the issue persists, it's essential to investigate further and potentially seek assistance from DigitalOcean support or the Ubuntu community.

Sudo unable to resolve host digitalocean