Este artículo propone automatizar la instalación de docker en Raspberry Pi mediante Ansible con un rol hecho en casa.

Prerrequisitos

Instalación de Docker

Recuperación del rol
He desarrollado un rol de ansible para esta automatización, aquí está cómo recuperarlo:

git clone https://gitlab.com/jls42/ansible-rpi-docker.git roles/ansible-rpi-docker

Para más detalles, ver la documentación en ansible-rpi-docker

Creación del archivo de inventario llamado inventory
En este ejemplo de inventario, el Raspberry Pi tiene la ip 192.168.1.190

[rpi1]
192.168.1.190 servername=rpi1

Preparación del playbook docker-rpi.yml

---
- name: "Installation de Docker sur le Raspberry Pi"
  hosts: rpi1
  remote_user: "pi"
  roles:
    - roles/ansible-rpi-docker
  vars:
    docker_version: 18.06.1~ce~3-0~raspbian

Despliegue de Docker

export ANSIBLE_HOST_KEY_CHECKING=False
ansible-playbook -b -i inventory docker-rpi.yml

Esto resulta en:

jls42@boo:~/rpi$ ansible-playbook -b -i inventory docker-rpi.yml

PLAY [Installation de Docker sur le Raspberry Pi] ******************************************************************************************************************************************************************************************

TASK [Gathering Facts] *********************************************************************************************************************************************************************************************************************
Sunday 09 December 2018  01:20:47 +0100 (0:00:00.050)       0:00:00.051 *******
ok: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Installe les paquets nécessaires à l'utilisation d'un dépôt HTTPS] *****************************************************************************************************************************************
Sunday 09 December 2018  01:20:50 +0100 (0:00:03.350)       0:00:03.401 *******
changed: [192.168.1.190] => (item=[u'apt-transport-https', u'ca-certificates', u'curl', u'gnupg2', u'software-properties-common'])

TASK [roles/ansible-rpi-docker : Ajoute la clef officielle du dépôt Docker] ****************************************************************************************************************************************************************
Sunday 09 December 2018  01:21:41 +0100 (0:00:51.274)       0:00:54.675 *******
changed: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Ajoute le dépôt Docker] ***********************************************************************************************************************************************************************************
Sunday 09 December 2018  01:21:46 +0100 (0:00:04.766)       0:00:59.442 *******
changed: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Installe le paquet docker-ce] *****************************************************************************************************************************************************************************
Sunday 09 December 2018  01:21:57 +0100 (0:00:10.451)       0:01:09.893 *******
changed: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Installe python-pip] **************************************************************************************************************************************************************************************
Sunday 09 December 2018  01:23:14 +0100 (0:01:17.283)       0:02:27.177 *******
changed: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Installe docker-compose via pip] **************************************************************************************************************************************************************************
Sunday 09 December 2018  01:24:02 +0100 (0:00:48.630)       0:03:15.807 *******
changed: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Configure Docker pour qu'il démarre au boot] **************************************************************************************************************************************************************
Sunday 09 December 2018  01:24:58 +0100 (0:00:55.582)       0:04:11.390 *******
ok: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Ajoute l'utilisateur pi dans le groupe docker] ************************************************************************************************************************************************************
Sunday 09 December 2018  01:24:59 +0100 (0:00:01.089)       0:04:12.480 *******
changed: [192.168.1.190]

TASK [roles/ansible-rpi-docker : Supprime la swap] *****************************************************************************************************************************************************************************************
Sunday 09 December 2018  01:25:00 +0100 (0:00:01.265)       0:04:13.745 *******
changed: [192.168.1.190]

PLAY RECAP *********************************************************************************************************************************************************************************************************************************
192.168.1.190              : ok=10   changed=8    unreachable=0    failed=0   

Sunday 09 December 2018  01:25:02 +0100 (0:00:02.002)       0:04:15.748 *******
===============================================================================
roles/ansible-rpi-docker ---------------------------------------------- 252.35s
setup ------------------------------------------------------------------- 3.35s
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
total ----------------------------------------------------------------- 255.70s
Playbook run took 0 days, 0 hours, 4 minutes, 15 seconds
jls42@boo:~/rpi$

Verificación

Nos conectamos al Raspberry Pi para confirmar que Docker se ha instalado correctamente

jls42@boo:~/rpi$ ssh pi@192.168.1.190
Linux rpi1 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sun Dec  9 00:25:01 2018 from 192.168.1.42
pi@rpi1:~ $ docker --version
Docker version 18.06.1-ce, build e68fc7a

¡A disfrutar!

Este documento ha sido traducido de la versión francesa del blog por el modelo gpt-4-1106-preview