Docker Swarm Cheatsheet

These commands are used to manage a Docker Swarm cluster, create and manage Docker services, and manage Docker networks.

• docker network create -d overlay collabnet creates a new Docker overlay network named "collabnet".

• docker network ls lists all the available Docker networks.

• docker network inspect collabnet inspects the details of the "collabnet" network.

• docker service create --name http --network collabnet --replicas 2 -p 80:80 ajeetraina/hellowhale creates a new Docker service named "http" with 2 replicas, running the "ajeetraina/hellowhale" image and connected to the "collabnet" network. Port 80 is exposed on the host and maps to port 80 in the container.

• docker ps lists all the running containers.

• curl your_machine_ip:80 sends a request to the IP address "your_machine_ip" on port 80.

• docker service ps http shows the status of the "http" service.

• docker service inspect --pretty http inspects the details of the "http" service.

• docker node ps self shows the tasks running on the current node.

• docker node ps $(docker node ls -q | head -n1) shows the tasks running on the first node in the cluster.

• docker service scale http=5 scales the number of replicas of the "http" service to 5.

• curl your_machine_ip:80 sends another request to the IP address "your_machine_ip" on port 80.

• docker service scale http=2 scales the number of replicas of the "http" service back to 2.

• docker service create --name sleep-app ubuntu sleep infinity creates a new Docker service named "sleep-app" with a single replica running the "ubuntu" image and running the "sleep infinity" command.

• docker service update --replicas 7 sleep-app updates the number of replicas of the "sleep-app" service to 7.

• docker service ls lists all the available Docker services.

• docker service ps sleep-app shows the status of the "sleep-app" service.

• docker service update --replicas 4 sleep-app updates the number of replicas of the "sleep-app" service back to 4.

• docker node ls lists all the nodes in the Swarm cluster.

• docker node update --availability drain worker2 drains the node "worker2" so that no new tasks will be scheduled on it.

• docker node inspect --pretty worker2 inspects the details of the "worker2" node.

• docker node update --availability active worker2 reactivates the "worker2" node so that it can again receive tasks.

• docker service rm sleep-app removes the "sleep-app" service.

• docker service ls lists all the available Docker services.

• docker kill yourcontainerid kills the container with the ID "yourcontainerid".

• docker swarm leave --force forces the current node to leave the Swarm cluster.

• docker swarm join-token manager retrieves the command to join the Swarm cluster as a manager.

• docker network create --driver=overlay --subnet=192.168.1.0/24 --gateway=192.168.1.100 myoverlay0 creates network of overlay type with specified subnet and gateway.