Docker Guide

Docker Introduction

<https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-debian-9>

Docker is an application that simplifies the process of managing application processes in containers.
Containers let you run your applications in resource-isolated processes. They’re similar to virtual machines, but containers
are more portable, more resource-friendly, and more dependent on the host operating system.

For a detailed introduction to the different components of a Docker container, check out The Docker Ecosystem: An Introduction to
Common Components.

You can check SWUpdate's online documentation at: http://sbabic.github.io/swupdate
This Introduction was taken from the SWUpdate README.md at: https://github.com/sbabic/swupdate

Yocto Integration

Recipes

Before you begin, get familiar with the Varicite Yocto Build Release guide.

Variscite provides the following image recipes:

• var-image-docker - Based on fsl-image-core with the following differences:
  • xxxxxxxxxxxxxx

Create a Docker-ready Image

• Follow steps 1-3 of the Yocto Build Release page.

$ cd 
$ MACHINE= DISTRO=

$ bitbake var-image-docker (for the rootfs to be installed on the eMMC)

Test Docker

• check target internet connection
  

 root@imx8mm-var-dart:~# ping www.google.com

• Get target ip address.
  
• Open ssh terminal from host:
  

 ssh root@<ip address>

• Check docker version.
  

 root@imx8mm-var-dart:~# docker --version

 Docker version 18.09.3-ce, build f5e591e

Test hello-world

 root@imx8mm-var-dart:~# docker pull hello-world

 Using default tag: latest

 latest: Pulling from library/hello-world

 256ab8fe8778: Pull complete 

 Digest: sha256:f9dfddf63636d84ef479d645ab5885156ae030f611a56f3a7ac7f2fdd86d7e4e

 Status: Downloaded newer image for hello-world:latest

• List docker images:
  

  root@imx8mm-var-dart:~# docker images

  REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

  hello-world         latest              a29f45ccde2a        3 months ago        9.14kB

• Run hello-world:
  

  root@imx8mm-var-dart:~# docker run hello-world

  Hello from Docker!

  This message shows that your installation appears to be working correctly.

  To generate this message, Docker took the following steps:

   1. The Docker client contacted the Docker daemon.

   2. The Docker daemon pulled the "hello-world" image from the Docker Hub.

      (arm64v8)

   3. The Docker daemon created a new container from that image which runs the

      executable that produces the output you are currently reading.

   4. The Docker daemon streamed that output to the Docker client, which sent it

      to your terminal.

Test ubuntu

 root@imx8mm-var-dart:~# docker pull ubuntu
 Using default tag: latest
 latest: Pulling from library/ubuntu
 b2f61026a351: Pull complete 
 5538fb30c42c: Pull complete 
 f0b05810781a: Pull complete 
 0180a33352d6: Pull complete 
 Digest: sha256:bec5a2727be7fff3d308193cfde3491f8fba1a2ba392b7546b43a051853a341d
 Status: Downloaded newer image for ubuntu:latest

• List docker images:
  

  root@imx8mm-var-dart:~# root@imx8mm-var-dart:~# docker images
  REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
  ubuntu              latest              428b2f74b0fb        2 weeks ago         57.7MB
  hello-world         latest              a29f45ccde2a        3 months ago        9.14kB

• Run ubuntu:
  

  root@imx8mm-var-dart:~# docker run -it ubuntu

  root@8637148015f5:/# apt update

  .................................

  Fetched 16.3 MB in 11s (1471 kB/s)
                                                                                                              
  Reading package lists... Done

  Building dependency tree

  Reading state information... Done

  12 packages can be upgraded. Run 'apt list --upgradable' to see them.

  root@8637148015f5:/# apt install nodejs

  Reading package lists... Done

  Building dependency tree

  Reading state information... Done

  The following additional packages will be installed:

    ca-certificates libc-ares2 libhttp-parser2.7.1 libicu60 libnghttp2-14 libssl1.0.0 libssl1.1 libuv1 nodejs-doc openssl

  The following NEW packages will be installed:

    ca-certificates libc-ares2 libhttp-parser2.7.1 libicu60 libnghttp2-14 libssl1.0.0 libssl1.1 libuv1 nodejs nodejs-doc openssl

  0 upgraded, 11 newly installed, 0 to remove and 12 not upgraded.

  Need to get 15.6 MB of archives.

  After this operation, 62.8 MB of additional disk space will be used.

  Do you want to continue? [Y/n] y

  ...........................................

  Updating certificates in /etc/ssl/certs...

  0 added, 0 removed; done.

  Running hooks in /etc/ca-certificates/update.d...

  done.

  root@8637148015f5:/# node -v

  v8.10.0

  root@8637148015f5:/# exit

Test docker-compose

• Check docker-compose version.
  

 root@imx8mm-var-dart:~# docker-compose --version

 docker-compose version 1.21.2, build e7de1bc

 root@imx8mm-var-dart:~#