Docker Alpine base image with S6 overlay for X86 and ARM

Based on Alpine with the S6 overlay to be able to run processes with custom UID (user id) and GID (group id). This prevents all kinds of problems with external mountpoints and incorrect user permissions.

This setup is inspired by the fine work done by linuxserver.io and hypriot

Quick setup

This image should be used as the base image for new custom images. See https://github.com/just-containers/s6-overlay for more information about the S6 overlay system.

Build image locally

For X86 based images use the following:

docker build -f ./x86/Dockerfile -t baseimage .

For ARM (e.g. Raspberry Pi) based images use the following:

docker build -f ./arm/Dockerfile -t rpi-baseimage .

Use as base image

For X86 based images use the following:

FROM erikdevries/baseimage:latest

For ARM (e.g. Raspberry Pi) based images use the following:

FROM erikdevries/rpi-baseimage:latest

With this base image you get a system that includes Alpine Linux with S6 overlay installed. A single script is installed with this base image, namely to create a custom user (abc with UID = 1000) and group (abc with GID = 1000).

Provide the following environment variables when starting a container to modify the user id and/or group id:

• PUID to modify the UID (1000 by default)
• PGID to modify the GID (1000 by default)

To find out the UID and GID for the user running Docker, run the following command;

  $ id <dockeruser>
    uid=1001(dockeruser) gid=1001(dockergroup) groups=1001(dockergroup)