ENTRYPOINT [...] - Specify Entrypoint Executable

Q

How to specify the executable program to the ENTRYPOINT instruction in DockerFile?

✍: FYIcenter.com

A

The ENTRYPOINT instruction has two different syntax formats.

1. Executable Program Format - Executable Program Format allows you to specify the path name of an executable program file and its parameters in a JSON array format.

ENTRYPOINT ["executable", "param1", "param2", ...]

2. Shell Command Format - Shell Command Format allows you to specify the name of a shell command and its parameters in a command line format.

ENTRYPOINT command param1 param2 ...

When you use the Shell Command Format, the specified command will be executed using "/bin/sh -c" as the actual executable program. For example:

If you specify the following in the Dockerfile:
   ENTRYPOINT echo Hello!

The container will start with:
   /bin/sh -c 'echo Hello!'

So it's better to use Executable Program Format, which gives you more direct control.

 

Build "sleep" Image from Alpine

Build "hello" Image from Alpine

Building Docker Image with "docker build"

⇑⇑ Docker Container Platform - Tutorials

2019-06-01, 148👍, 0💬