Could not translate host name “db” to address: temporary failure in name resolution

This error message “could not translate host name “db” to address: temporary failure in name resolution” typically occurs when a host name cannot be resolved to an IP address. This issue commonly occurs due to misconfiguration or network connectivity problems.

Here are a few possible reasons for this error and their solutions:

1. Incorrect host name: Make sure the host name you provided is correct. Check for any typos or mistakes in the host name.
2. DNS server issues: Ensure that your DNS (Domain Name System) settings are correctly configured. DNS is responsible for resolving host names to IP addresses. If there are any issues with the DNS server, it may result in a failure to resolve the host name.
3. Network connectivity problems: Check your network connectivity to ensure you have an active and stable internet connection. If there are any network-related issues, the DNS resolution may fail.
4. Firewall or proxy settings: Verify that there are no firewall or proxy restrictions preventing the resolution of the host name. Adjust the firewall or proxy settings if necessary.

Example Scenario:

In a web application, if the application is configured to connect to a PostgreSQL database with the hostname “db”, but the DNS server or network connectivity is not properly set up, the error “could not translate host name ‘db’ to address” may occur when attempting to establish a connection.

To resolve this issue, you can perform the following steps:

1. Ensure that the hostname “db” is correct and matches the actual database server.
2. Check the DNS server configuration to ensure it can resolve the hostname “db” to the appropriate IP address. Correct any misconfigurations or network connectivity issues accordingly.
3. Verify that there are no firewall rules or proxy settings blocking the connection to the database server. Adjust the firewall or proxy settings as needed.

By addressing these potential causes, you can troubleshoot and resolve the error “could not translate host name ‘db’ to address: temporary failure in name resolution” in your specific scenario.