How to pass arguments to entrypoint in docker-compose.yml

Question

I use this image: dperson/samba

The image is defining it\'s own entrypoint and I do not want to override it.

I need to pass arguments to the entrypoint, easy

Answer 1

To override the default entrypoint, use entrypoint option. To pass the arguments use command.

Here is the example of replacing bash with sh in ubuntu image:

version: '3'
services:
  sh:
    entrypoint: /bin/sh
    command: -c "ps $$(echo $$$$)"
    image: ubuntu
    tty: true
  bash:
    entrypoint: /bin/bash
    command: -c "ps $$(echo $$$$)"
    image: ubuntu
    tty: true

Here is the output:

$ docker-compose up   
Starting test_sh_1                ... done
Starting 020211508a29_test_bash_1 ... done
Attaching to test_sh_1, 020211508a29_test_bash_1
sh_1    |   PID TTY      STAT   TIME COMMAND
sh_1    |     1 pts/0    Ss+    0:00 /bin/sh -c ps $(echo $$)
020211508a29_test_bash_1 |   PID TTY      STAT   TIME COMMAND
020211508a29_test_bash_1 |     1 pts/0    Rs+    0:00 ps 1