How to configure docker-compose.yml to up a container as root

DockerDocker Compose

Docker Problem Overview

I'm trying to connect two containers with a docker-compose-yml, but it isn't working. This is my docker-compose.yml file:

version: "3"
services:
    datapower:
        build: .
        ports:
            - "9090:9090"
        depends_on:
            - db
    db:
        image: "microsoft/mssql-server-linux:2017-latest"
        environment:
            SA_PASSWORD: "your_password"
            ACCEPT_EULA: "Y"
        ports:
        - "1433:1433"

When I make:

> docker-compose up

This up my two containers. Then I stop one container and then I run the same container stoped independiently like:

> docker-compose run -u root --name nameofcontainer 'name of container named in docker-compose.yml'

With this, the connection of the containers works. Exists a method to configure my docker-compose.yml to connect my containers like root without stop a container and run independently?

Docker Solutions

Solution 1 - Docker

Update:

There exists the user property that can be set in the compose file. This is documented in docker-compose file reference.

...
services:
    datapower:
        build: .
        user: root
        ports:
            - "9090:9090"
        depends_on:
            - db
...

Solution 2 - Docker

Setting both a User AND a Group in docker-compose.yml:

Discovered another way to set not only the user but also the group in a docker-compose.yml file which is NOT documented in the Docker Compose File Reference @yamenk helpfully provides in the accepted answer.

I needed to raise a container expressly setting both a user AND a group and found that the user: parameter in docker-compose.yml can be populated as a UID:GID mapping delimited by a colon.

Below is a snippet from my docker-compose.yml file where this form was tested and found to work correctly:

services:
 zabbix-agent:
  image: zabbix/zabbix-agent2:ubuntu-6.0-latest
  container_name: DockerHost1-zabbix-agent2
  user: 0:0
<SNIP>

Reference:

https://github.com/zabbix/zabbix-docker/issues/710

Hope this saves others wasted cycles looking for this!

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionCarlos AndresView Question on Stackoverflow
Solution 1 - DockeryamenkView Answer on Stackoverflow
Solution 2 - DockerF1LinuxView Answer on Stackoverflow