blog/content/posts/2022-02-20-build-your-own-docker-swarm-cluster-part-3/index.md

title, date, description, tags, slug, draft

title	date	description	tags	slug	draft
Setup a Docker Swarm cluster - Part III	2022-02-20	Build an opinionated containerized platform for developer...	docker swarm	build-your-own-docker-swarm-cluster-part-3	true

{{< lead >}} Build your own cheap while powerful self-hosted complete CI/CD solution by following this opinionated guide 🎉 {{< /lead >}}

This is the Part III of more global topic tutorial. [Back to first part]({{< ref "/posts/2022-02-13-build-your-own-docker-swarm-cluster" >}}) to start from beginning.

Keep the containers image up-to-date

It's finally time to test our new cluster environment by testing some images through the Portainer GUI. We'll start by installing Diun, a nice tool for keeping our images up-to-date.

Create a new diun stack through Portainer and set following content :

version: "3.2"

services:
  diun:
    image: crazymax/diun:latest
    command: serve
    volumes:
      - /mnt/storage-pool/diun:/data
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      TZ: Europe/Paris
      DIUN_WATCH_SCHEDULE: 0 */6 * * *
      DIUN_PROVIDERS_SWARM: 'true'
      DIUN_PROVIDERS_SWARM_WATCHBYDEFAULT: 'true'
      DIUN_NOTIF_MAIL_HOST:
      DIUN_NOTIF_MAIL_PORT:
      DIUN_NOTIF_MAIL_USERNAME:
      DIUN_NOTIF_MAIL_PASSWORD:
      DIUN_NOTIF_MAIL_FROM:
      DIUN_NOTIF_MAIL_TO:
    deploy:
      placement:
        constraints:
          - node.role == manager

{{< tabs >}} {{< tab tabName="volumes" >}}

name	description
/mnt/storage-pool/diun	It will be used for storage of Diun db location, Diun need it for storing detection of new images version and avoid notification spams. Don't forget to create a new dedicated folder in the GlusterFS volume with sudo mkdir /mnt/storage-pool/diun.
/var/run/docker.sock	For proper current docker images used detection through Docker API

{{< /tab >}} {{< tab tabName="environment" >}}

name	description
TZ	Required for proper timezone schedule
DIUN_WATCH_SCHEDULE	The standard linux cron schedule
DIUN_PROVIDERS_SWARM	Required for detecting all containers on all nodes
DIUN_PROVIDERS_SWARM_WATCHBYDEFAULT	If true, no need of explicit docker label everywhere
DIUN_NOTIF_MAIL_*	Set all according to your own mail provider, or use any other supported notification.

{{< alert >}} Use below section of Portainer for setting all personal environment variable. In all cases, all used environment variables must be declared inside YML. {{< /alert >}}

{{< /tab >}} {{< /tabs >}}

Installation of databases

MySQL

PostgreSQL