Docker Swarm on CentOS

docker swarm linux container centos

Reference:
https://docs.docker.com/engine/swarm/swarm-tutorial/
https://docs.docker.com/engine/swarm/services/

Docker swarm ports:

• TCP port 2377 - cluster management communications
• TCP and UDP port 7946 - communication among nodes
• UDP port 4789 - overlay network traffic
• Port 7946 TCP/UDP for container network discovery
• Port 4789 UDP for the container ingress network

sudo yum remove docker docker-common docker-selinux docker-engine
sudo yum install -y yum-utils   device-mapper-persistent-data   lvm2
sudo yum-config-manager     --add-repo     https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce
yum list docker-ce --showduplicates | sort -r
sudo systemctl start docker
sudo docker run helo-world
sudo usermod -a -G docker <docker user>
# exit and relogin
docker run hello-world
sudo systemctl enable docker
firewall-cmd --state
docker swarm init --advertise-addr <Manager IP>
docker swarm join --token <token> <manager ip>

# check token
docker swarm join-token manager
docker swarm join-token worker

# create service
docker service create --replicas 3 --name <service name> --publish published=3080,target=80 --mount type=bind,src=/home/navysu/projects/myweb,dst=/usr/share/nginx/html nginx

# check service
docker service ps <service id>
docker service inspect --pretty <service id>

# delete service
docker service rm <service name>

# scale service
docker service scale <Service-id>=<number-of-task>

# update service
docker service update --publish-add 80 my_web

Command	Description
docker node demote	Demote one or more nodes from manager in the swarm
docker node inspect	Display detailed information on one or more nodes
docker node ls	List nodes in the swarm
docker node promote	Promote one or more nodes to manager in the swarm
docker node ps	List tasks running on one or more nodes, defaults to current node
docker node rm	Remove one or more nodes from the swarm
docker node update	Update a node

Written on February 23, 2018