Run sudo commands from inside of docker compose

Question

I am using AWS EC2 instance and have installed docker and docker-compose on AWS linux.

Now I have a docker-compose.yml file which is trying the command mkdir -p /workspace/.m2/repositories. Now this command requires sudo, otherwise it gives permissions error.

I tried adding sudo inside docker-compose but it gave me an error saying

sudo: command not found

I can run this command manually and can comment this command inside of docker-compose.yml file but I am interested to know that is there any way to run this command from inside of docker-compose.yml file?

Answer 1

I may have a solution for you. You can extend the strongbox image in a custom Dockerfile to solve this issue I think.

Create a new Dockerfile, like this one:

Dockerfile

FROM strongboxci/alpine:jdk8-mvn-3.5

USER root

RUN mkdir -p /workspace/.m2/repositories
RUN chown jenkins:jenkins /workspace/.m2/repositories

USER jenkins

Then build the image with something like this:

docker build -t mystrongbox:01 .

And finally update the docker-compose.yml file to this:

docker-compose.yml

version: '2'
services:
  strongbox-from-web-core:
    image: mystrongbox:01
    command:
      - /bin/bash
      - -c
      - |
         echo ""
         echo "[NOTICE]   This will take at least 2 to 5 minutes to start depending on your machine and connection!"
         echo ""
         echo "           Open http://localhost:48080/storages to browse the repository contents."
         echo ""
         sleep 5
         mkdir -p /workspace/.m2/repositories
         mvn clean install -DskipTests -Dmaven.repo.local=/workspace/.m2/repositories
         cd strongbox-web-core
         mvn spring-boot:run -Dmaven.repo.local=/workspace/.m2/repositories
    ports:
      - 48080:48080
    volumes:
      - ./:/workspace
    working_dir: /workspace

Finally try again with:

docker-compose up

Then you will have the directory created in the image already, and ownership set to the jenkins user.