Command to leave docker swarm

$ docker swarm leave --force

docker update the state of your service by using the command

docker service update

Update docker service with an updated number of replicas.

docker service update --replicas=5 --detach=true [servicename]

verify docker swarm node cluster

docker node ls

To add a worker to this docker swarm

docker swarm join \
    --token **** \
    10.0.120.3:2377

Initialize the docker swarm

docker swarm init --advertise-addr eth0

Check layers of docker image

docker image history [imagename]