Verifying name resolution
DNS resolution for containers has always been rather straightforward. The container received the same DNS configuration as the host. However, with the advent of user-defined networks and the embedded DNS server, this has now become a little trickier. A common problem in many of the DNS issues I've seen is not understanding how the embedded DNS server works and how to validate that it's working correctly. In this recipe, we'll step through a container DNS configuration to validate which DNS server it is using to resolve specific namespaces.
Getting ready
In this recipe, we'll be using a single Docker host. It is assumed that Docker is installed and in its default configuration. You'll also need root-level access in order ...
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