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That’s right. If you are very familiar with all the processes, you can naturally write the Dockerfile directly. However, there is basically no absolute guarantee for this kind of thing. In particular, most of Docker’s basic system images are very streamlined, and some software dependency packages need to be downloaded and installed. Therefore, although the process of building a container by yourself is a bit time-consuming, it is relatively short. On the contrary, it will save time than dreaming about writing Dockerfile.

Usually writing a Dockerfile is a process like this:

1. Preview the installation process through the container and record the build commands

2. Summarize and optimize installation commands, and write Dockerfile

3. Try to use Dockerfile to build the image and check if there are any problems

4. Create a container through the built image to ensure that the program in it can be used correctly

By referring to the ready-made dockerfile on docker hub and modifying it according to your own needs, it will be more efficient. To write the dockerfile from scratch, you can only do it like the brothers above. I call it the "video recorder" method.