Configuration

If you have worked with TLS certificates, you may have encountered files with the extensions .pem, .crt, and .key. You might be wondering what they are, what differences they have, and how to use them effectively. The good news is that these formats aren’t as complicated as they seem once you understand the basics: PEM, CRT, and KEY are not different certificate types — they are different ways of packaging the same data. ...

If you build your own container manage system when integrating docker client library, you may also encounter issues with credential resolution. If you system maintain the registry credential, it is easy to assume that authentication will “just work” once credentials are configured in your platform. But behind the scenes, Docker follows a specific and sometimes confusing logic for how it locates and uses credentials. This post explains that behavior in depth and highlights one of the most common causes of authentication issues developers face when using the Docker client as part of a backend or automation workflow. ...