Docker Swarm

GlusterFS

Install

sudo apt install glusterfs-server
sudo systemctl start glusterd.service 

Add peer

sudo gluster peer probe docker-pi-b

Create Volume

gluster volume create gv0 replica 2 docker-pi-a:/opt/brick docker-pi-b:/opt/brick
gluster volume create gv0 replica 2 docker-pi-a:/opt/brick docker-pi-b:/opt/brick force
gluster volume start gv0

Mount volume

mount -t glusterfs docker-pi-a:/gv0 /mnt/gv0/

VRRP

Install keepalived

sudo apt install keepalived

Configure keepalived

cd /etc/keepalived/
sudo joe keepalived.conf

/etc/keepalived/keepalived.conf @ master node

vrrp_instance vrrp_a {
        interface wlan0
        state MASTER
        virtual_router_id 133
        priority 101
        authentication {
                auth_type AH
                auth_pass pass
        }
        virtual_ipaddress {
                192.168.38.38
        }
}

/etc/keepalived/keepalived.conf @ backup node

vrrp_instance vrrp_a {
        interface wlan0
        state BACKUP
        virtual_router_id 133
        priority 100
        authentication {
                auth_type AH
                auth_pass pass
        }
        virtual_ipaddress {
                192.168.38.38
        }
}

Start VRRP:

sudo service keepalived start

Swarm

Install Docker

echo "deb [arch=armhf] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" |     sudo tee /etc/apt/sources.list.d/docker.list
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
sudo apt install --no-install-recommends docker-ce
sudo usermod -a -G docker pi

Create Swarm

Node A:

docker swarm init
docker swarm join-token manager

Node B:

docker swarm join --token *token* 192.168.38.85:2377

Create stack for Traefik

Node:

docker network create --driver overlay --attachable backend
docker network create --ingress --driver overlay pub

docker stack deploy -c traefik.yml traefik

traefik.yml:

version: "3.4"
services:
  traefik:
    image: traefik:latest
    command:
      - "--docker"
      - "--docker.swarmmode"
      - "--docker.watch"
      - "--web"
    volumes:
      - type: bind
        source: /var/run/docker.sock
        target: /var/run/docker.sock

    networks:
      - "backend"
    ports:
      - "80:80"
      - "8080:8080"
      - "443:443"
    deploy:
      replicas: 2
      placement:
        constraints:
          - node.role == manager
      restart_policy:
        condition: on-failure

networks:
    backend:
      external: true