View source for 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.<br>
Containers let you run your applications in resource-isolated processes. They’re similar to virtual machines, but containers<br>
are more portable, more resource-friendly, and more dependent on the host operating system.<br>
<br>
For a detailed introduction to the different components of a Docker container, check out The Docker Ecosystem: An Introduction to<br> Common Components.<br>
<br>
You can check SWUpdate's online documentation at: [http://sbabic.github.io/swupdate http://sbabic.github.io/swupdate]<br>
This Introduction was taken from the SWUpdate README.md at: [https://github.com/sbabic/swupdate https://github.com/sbabic/swupdate]<br>
<br>

= Yocto Integration =

== Recipes ==

Before you begin, get familiar with the Varicite {{Varlink2|Yocto Build Release|{{#var:RELEASE_LINK}}}} guide.<br>
<br>
Variscite provides the following image recipes:

* '''var-image-docker''' - Based on fsl-image-core with the following differences:
** xxxxxxxxxxxxxx
<br>
== Create a Docker-ready Image ==
* Follow steps 1-3 of the {{Varlink2|Yocto Build Release|{{#var:RELEASE_LINK}}}} page.
 $ cd {{#var:BUILD_FOLDER}}
 {{#ifeq: {{#var:SOC_SERIES}} | imx8 |
$ MACHINE={{#var:MACHINE_NAME}} DISTRO={{#var:BUILD_DISTRO}} {{#var:BUILD_SCRIPT}} -b {{#var:BUILD_FOLDER_XWAYLAND}}
|
$ MACHINE={{#var:MACHINE_NAME}} DISTRO={{#var:BUILD_DISTRO}} {{#var:BUILD_SCRIPT}} {{#var:BUILD_FOLDER_X11}}
}}

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

= Test Docker =
* Check target internet connection<br>
  root@imx8mm-var-dart:~# ping www.google.com

* Get target ip address.<br>
* Open ssh terminal from host:<br>
  ssh root@<ip address>

* Check docker version.<br>
  root@imx8mm-var-dart:~# docker --version<br>
  Docker version 18.09.3-ce, build f5e591e

== Test hello-world ==
root@imx8mm-var-dart:~# docker pull hello-world<br>
Using default tag: latest<br>
latest: Pulling from library/hello-world<br>
256ab8fe8778: Pull complete <br>
Digest: sha256:f9dfddf63636d84ef479d645ab5885156ae030f611a56f3a7ac7f2fdd86d7e4e<br>
Status: Downloaded newer image for hello-world:latest<br>

* List docker images:<br>
  root@imx8mm-var-dart:~# docker images<br>
  REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE<br>
  hello-world         latest              a29f45ccde2a        3 months ago        9.14kB

* Run hello-world:<br>
  root@imx8mm-var-dart:~# docker run hello-world

  Hello from Docker!<br>
  This message shows that your installation appears to be working correctly.

  To generate this message, Docker took the following steps:<br>
   1. The Docker client contacted the Docker daemon.<br>
   2. The Docker daemon pulled the "hello-world" image from the Docker Hub.<br>
      (arm64v8)<br>
   3. The Docker daemon created a new container from that image which runs the<br>
      executable that produces the output you are currently reading.<br>
   4. The Docker daemon streamed that output to the Docker client, which sent it<br>
      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:<br>
  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:<br>
  root@imx8mm-var-dart:~# docker run -it ubuntu<br>
  root@8637148015f5:/# apt update<br>
  .................................<br>
  Fetched 16.3 MB in 11s (1471 kB/s)<br>                                                                                                              
  Reading package lists... Done<br>
  Building dependency tree<br>
  Reading state information... Done<br>
  12 packages can be upgraded. Run 'apt list --upgradable' to see them.

  root@8637148015f5:/# apt install nodejs<br>
  Reading package lists... Done<br>
  Building dependency tree<br>
  Reading state information... Done<br>
  The following additional packages will be installed:<br>
    ca-certificates libc-ares2 libhttp-parser2.7.1 libicu60 libnghttp2-14 libssl1.0.0 libssl1.1 libuv1 nodejs-doc openssl<br>
  The following NEW packages will be installed:<br>
    ca-certificates libc-ares2 libhttp-parser2.7.1 libicu60 libnghttp2-14 libssl1.0.0 libssl1.1 libuv1 nodejs nodejs-doc openssl<br>
  0 upgraded, 11 newly installed, 0 to remove and 12 not upgraded.<br>
  Need to get 15.6 MB of archives.<br>
  After this operation, 62.8 MB of additional disk space will be used.<br>
  Do you want to continue? [Y/n] y<br>
  ...........................................<br>
  Updating certificates in /etc/ssl/certs...<br>
  0 added, 0 removed; done.<br>
  Running hooks in /etc/ca-certificates/update.d...<br>
  done.<br>

  root@8637148015f5:/# node -v<br>
  v8.10.0<br>
  root@8637148015f5:/# exit<br>

= Test docker-compose =
* Check docker-compose version.<br>
  root@imx8mm-var-dart:~# docker-compose --version<br>
  docker-compose version 1.21.2, build e7de1bc<br>
  root@imx8mm-var-dart:~#