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READ1-iotplay-dockerimages.md

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Notes on RPi & Mac IoTpPlay standards

---> Back to the README file with the Table of Contents.

The IoTPlay Docker Images

Currently used Images

# Image Used Arm8 x86_64 Source - Link Tag & version used Based On
1 docker private reg. Y N todo
2 docker_nginx_arm Y N GitHub IoTPlay
3 docker_mosquitto Y Y GitHub IoTPlay
4 docker_nodered Y Y Docker Hub 0.19.4-v8
5 docker_mariadb Y Y GitHub IoTPlay
6 Node-RED HomeKit Y Y Docker Hub 0.3.6-0.19.0-alpine-arm64v8

Previously used Images

Previously we had to shape some of our own images, replacements were found. Some lessons learnt in our own.

# IoTPlay Image Arm8 x86_64 Tgt - Link
1 docker_nodered IoTPlay Y Y GitHub

Notes on the Images

Design Principles for IoTPlay Images

  1. Use published images - that others maintain. 1st price - if they ar publishes on http://hub.docker.com
  2. For RaspberryPi 2/3's, As far as possible, docker images are to be built on arm64v8/alpine, link on docker hub
  3. Alpine v3.6, from gliderlabs/docker-alpine, link on github
  4. UserID's of the docker image sometimes clash with the host's's IDs. Some special care is required here. Our Node-RED image is such an example.

IoTPlay's Images in use

My list of Docker Images, and status below:

# IoTPlay Folder Tgt Pfrm O/S Base Image Dockerfile Status
1 docker_mariadb RPi alpine yobasystems/alpine-mariadb --none-- Prod
" " Mac bianjp/mariadb-alpine --none-- Dev
2 docker_mosquitto RPi resin resin/raspberrypi3-alpine Dockerfile_resinPi3 Prod
3 docker_nodered RPi hypriot hypriot/rpi-node Dockerfile_hypriot611 Prod
" " Mac alpine mhart/alpine-node Dockerfile_MacAlpine Dev
4 docker_openui5_go Mac alpine golang:alpine Dockerfile_openui5 Dev
5 docker_py_paradox RPi resin resin/raspberry-pi-alpine-python Dockerfile_py_paradox Test

About the Base Images

# Base Image Version Notes URL docker hub
1 yobasystems/alpine-mariadb armhf 176MB - too large !! dockerhub
2 bianjp/mariadb-alpine latest github
3 resin/raspberrypi3-alpine 3.6 dockerhub
4 hypriot/rpi-node 6.11 dockerhub
5 mhart/alpine-node 9.3.0 Minimal Node.js Docker Images dockerhub
6 golang:alpine Official golang on alpine dockerhub
7 resin/raspberry-pi-alpine-python latest Based on resin.io, with Py. dockerhub
  • So, is the chosen image: resin/raspberry-pi-alpine-node:0.10.22-slim ???

What is resin.io ?

resin is used in two images, from the company http://www.resin.io.

Think about moving image 3 - nodered across to alpine + node.js on resin:

  • resin/raspberry-pi-alpine-node

    • latest: 457MB !!
    • 0.10.22-slim : 64.6MB

    This image is part of the resin.io base image series for IoT devices. The image is optimized for use with resin.io and resinOS, but can be used in any Docker environment running on the appropriate architecture.

  • or resin/raspberrypi3-alpine ? for RPi Zero

    • latest : 47.8MB

    The bare bones Alpine Linux OS image for Raspberry Pi v1 & ZERO. Maintained by Resin.io.

  • for an IoT device: arm64v8/alpine

    A minimal Docker image based on Alpine Linux with a complete package index and only 5 MB in size!

Guidelines to Remember re Other Linux distros vs. Alpine.

  1. Alpine does not have useradd, thus use:
RUN addgroup -g ${PGID} abc && \
    adduser -D -u ${PUID} -G abc abc
  1. apt-get does not work on Alpine, see apk use here: https://wiki.alpinelinux.org/wiki/Alpine_Linux_package_management

---> Back to the README file with the Table of Contents.