High availability in Docker Swarm

Install Docker compose

export DOCKER_COMPOSE_VERSION=1.4.2

curl -L https://github.com/docker/compose/releases/download/$DOCKER_COMPOSE_VERSION/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose

Replace Consul and node IPs

sed -i 's/<consul_ip>/[CONSUL_IP]/g' docker-compose.yml
sed -i 's/<node_ip>/[NODE_IP]/g' docker-compose.yml

Configure Docker engine

Open and edit /etc/default/docker file

sudo vi /etc/default/docker

Configure Docker engine to listen on 0.0.0.0

DOCKER_OPTS="-H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375"

Then restart Docker engine

sudo service docker restart

On Consul node

docker-compose up -d consul

On each node

docker-compose up -d swarm-agent swarm-manager

Check Consul information

curl [CONSUL_IP]:8500/v1/kv/nodes?recurse | jq '.'

Check Cluster information

DOCKER_HOST=$(curl -s [CONSUL_IP]:8500/v1/kv/nodes/docker/swarm/leader?raw) docker info