docker-compose execute command

Question

I'm trying to put some commands in my docker-compose file to be ran in my container and they don't work.

I map a volume from host to container where I have a Root certificate, all I want to do is to run this command update-ca-certificates, so it will updates the directory /etc/ssl/certs with my cert in the container, however it is not happening.

I tried to solve this in a Dockerfile and I can see that the command runs, but it seems that the cert is not present there and just appears after I login to the container.

What I end doing is to get into the container, then I run the needed commands manually.

This is the piece of my docker-compose file that I have been trying to use:

build:
      context: .
      dockerfile: Dockerfile
    command: >
      sh -c "ls -la /usr/local/share/ca-certificates &&
             update-ca-certificates"
    security_opt:
      - seccomp:unconfined
    volumes:
      - "c:/certs_for_docker:/usr/local/share/ca-certificates"

In the same way I cannot run apt update or anything like this, but after connecting to the container with docker exec -it test_alerting_comp /bin/bash I can pull anything from any repo.

My goal is to execute any needed command on building time, so when I login to the container I have already the packages I will use and the Root cert updated, thanks.

Answer 1

Why dont you do package update/install and copy certificates in the Dockerfile?

Dockerfile

...
RUN apt-get update && apt-get -y install whatever

COPY ./local/certificates /usr/local/share/my-certificates

RUN your-command-for-certificates

docker-compose.yml

version: "3.7"
services:
  your-service:
    build: ./dir