How do you change the default DNS server for Docker containers?

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To change the default DNS server for Docker containers, one effective method is by configuring the DNS settings in the Docker daemon config file. This approach allows you to specify DNS servers globally, meaning that all containers spawned by that Docker daemon will inherit the specified DNS settings without needing to configure each one individually.

When you make the adjustments in the Docker daemon config file, you typically include DNS server addresses under the DNS options parameter. After making these changes, it's necessary to restart the Docker daemon for the new settings to take effect, ensuring that any new containers created will use the updated DNS configurations.

This method provides a centralized and consistent way to manage DNS settings across all containers, making it easier to maintain and ensuring all workloads can resolve names correctly, especially in environments where custom DNS servers are preferred or required for connectivity and security purposes.

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