CoreOS + Docker Swarm

docker advertise + overlay

sudo mkdir /etc/systemd/system/docker.service.d/
sudo vim /etc/systemd/system/docker.service.d/cluster.conf

[Service]
Environment="DOCKER_OPTS=--cluster-advertise=10.0.0.2:2375 --cluster-store=etcd://10.0.0.2:2379 --host=tcp://10.0.0.2:2375"

sudo systemctl daemon-reload
sudo systemctl restart docker
sudo systemctl enable docker

docker run -d --restart always --name swarm swarm join --addr 10.0.0.5:2375 etcd://10.0.0.5:2379
docker run -d --restart always --name swarm-manager -p 3375:3375 swarm manage -H=tcp://0.0.0.0:3375 etcd://10.0.0.4:2379

#run as swarm manager docker host

docker network create --driver overlay --subnet 10.0.1.0/24 cluster-network

etcd2

# on the first node, set the cloud data to be

#cloud-config

coreos:
  etcd2:
    advertise-client-urls: http://$private_ipv4:2379
    initial-advertise-peer-urls: http://$private_ipv4:2380
    listen-client-urls: http://0.0.0.0:2379
    listen-peer-urls: http://$private_ipv4:2380
    name: node-a
    initial-cluster-state: new
    initial-cluster: node-a=http://$private_ipv4:2380
  units:
    - name: etcd2.service
      command: start
      
# on the second node set the cloud data to be

#cloud-config

coreos:
  etcd2:
    advertise-client-urls: http://$private_ipv4:2379
    initial-advertise-peer-urls: http://$private_ipv4:2380
    listen-client-urls: http://0.0.0.0:2379
    listen-peer-urls: http://$private_ipv4:2380
    name: node-b
    initial-cluster-state: existing
    initial-cluster: node-a=http://10.0.0.2:2380,node-b=http://$private_ipv4:2380
  units:
    - name: etcd2.service
      command: start
      
# Once both nodes are running, run this on node-a

etcdctl member add node-b http://10.0.0.3:2380

# then restart etcd2 on node-b

sudo systemctl start etcd2