Docker - RUN, CMD, ENTRYPOINT, what to choose?

The article discusses best practices for using RUN, CMD, and ENTRYPOINT commands in Docker. It starts with a basic introduction to the differences between these commands. RUN is used to build images and execute commands during the image creation process. CMD, on the other hand, is used to specify the default command that should be run when a container starts. ENTRYPOINT, meanwhile, defines a command that is always executed regardless of any other arguments passed.

As the article progresses, the author emphasizes that the choice between CMD and ENTRYPOINT should be made thoughtfully, depending on the project's needs. It suggests using ENTRYPOINT when the intention is to ensure that the image runs in a specific way, irrespective of the provided arguments. Conversely, CMD should be used when we want users to easily override the default command.

Additionally, the article offers practical examples that illustrate how to use these commands in real-world scenarios. The author highlights the importance of testing images after they are physically created to ensure that all commands work as intended. Ultimately, the article serves as a valuable guide for developers and system administrators seeking to enhance their skills in using Docker.

In summary, the choice between RUN, CMD, and ENTRYPOINT in Docker should be made consciously, with consideration of the goals we want to achieve. A proper understanding of these commands allows for better container management and more effective image creation. Each of these options has its place in the Docker toolchain, and their proper usage can significantly impact the performance and functionality of applications. Readers are encouraged to delve into the content of the article to fully leverage Docker's capabilities.