Docker Swarm

Voir :

Notes générales

Vous allez avoir besoin d'au moins trois serveurs ou machines virtuelles avec Docker d'installé

The network ports required for a Docker Swarm to function correctly are:

TCP port 2376 for secure Docker client communication. This port is required for Docker Machine to work. Docker Machine is used to orchestrate Docker hosts.
TCP port 2377. This port is used for communication between the nodes of a Docker Swarm or cluster. It only needs to be opened on manager nodes.
TCP and UDP port 7946 for communication among nodes (container network discovery).
UDP port 4789 for overlay network traffic (container ingress networking).

ufw allow 22/tcp
ufw allow 2376/tcp
 
# Que sur le Manager
ufw allow 2377/tcp
 
ufw allow 7946/tcp
ufw allow 7946/udp
ufw allow 4789/udp
ufw reload
ufw enable
 
systemctl restart docker

docker system info

and looking for a message Swarm: active

Sur le Manager

# docker swarm init --advertise-addr 192.168.99.121
docker swarm init

docker swarm join --token SWMTKN-1-3pu6hszjas19xyp7ghgosyx9k8atbfcr8p2is99znpy26u2lkl-7p73s1dx5in4tatdymyhg9hu2 192.168.99.121:2377

Voir l'état des nœuds

docker node ls

https://www.grottedubarbu.fr/introduction-docker-swarm/

$ openstack server create --image "Ubuntu 20.04" --flavor "s1-4" --key-name "MyKey" --net "Ext-Net" --user-data=docker.yaml my-manager
$ openstack server create --image "Ubuntu 20.04" --flavor "s1-4" --key-name "MyKey" --net "Ext-Net" --user-data=docker.yaml my-worker1
$ openstack server create --image "Ubuntu 20.04" --flavor "s1-4" --key-name "MyKey" --net "Ext-Net" --user-data=docker.yaml my-worker2

docker-compose.yaml

version: "3"
services:
  viz:
    image: dockersamples/visualizer
    volumes:
       - "/var/run/docker.sock:/var/run/docker.sock"
    ports:
       - "8080:8080"

docker stack deploy -c docker-compose.yaml visualizer

Pour vérifier que votre service fonctionne :

docker service ls

docker service ps --no-trunc visualizer
docker service inspect visualizer

Registry

Voir https://docs.docker.com/engine/swarm/stack-deploy/

docker service create --name registry --publish published=5000,target=5000 registry:2

docker service ls
curl http://localhost:5000/v2/

Test the app with Compose

docker-compose up

docker-compose down --volumes

Push the generated image to the registry

docker-compose push

Déinstall

docker service ls
docker stack rm plop
docker swarm leave --force

Autres

docker swarm update --snapshot-interval 10000
systemctl restart docker