Dockerfile

dockerfile manuals:
- https://takacsmark.com/dockerfile-tutorial-by-example-dockerfile-best-practices-2018/
best practice:
- https://docs.docker.com/develop/develop-images/dockerfile_best-practices/

FROM - base image
ENV variable=test
- environment variable
- can be used with bash syntax $variable
VOLUME [ "/var/test" ]
- used to expose some storage
CMD
- what command should be run in the image
- CMD [“executable”, “param1”, “param2”, ...]
- Its possible to override the command on starting up a container docker run myImage:latest _command_
- Only last CMD will be used (so specifiy only one).
- Its a good practice to specify at leaset a shell command here.
ENTRYPOINT
- Used to specify the 'main executable' of the image
- If ENTRYPOINT is specified, CMD paramas will be added to the ENTRYPOINT
- ```
ENTRYPOINT ["git"]
CMD ["--help"]
```

build dockerfile