Docker swarm common command - mnhmilu/poc-kubernets GitHub Wiki

Sure! Docker Swarm is a container orchestration platform that allows you to create and manage a cluster of Docker nodes. Here are some common Docker Swarm-related commands and concepts:

1. Initialize a Swarm:

docker swarm init

2. Join a node to the Swarm (run this command on other nodes to add them to the Swarm):

docker swarm join --token <TOKEN> <MANAGER_IP>:<MANAGER_PORT>

3. Create a service (replicated or global mode):

docker service create --replicas <REPLICAS> --name <SERVICE_NAME> <IMAGE_NAME>
docker service create --mode global --name <SERVICE_NAME> <IMAGE_NAME>

4. List all services in the Swarm:

docker service ls

5. List tasks of a service:

docker service ps <SERVICE_NAME>

6. Scale a service (increase or decrease the number of replicas):

docker service scale <SERVICE_NAME>=<REPLICAS>

7. Update a service with a new image or configuration:

docker service update --image <NEW_IMAGE_NAME> <SERVICE_NAME>

8. Remove a service from the Swarm:

docker service rm <SERVICE_NAME>

9. List all nodes in the Swarm:

docker node ls

10. Inspect a specific node:

docker node inspect <NODE_ID>

11. Drain a node (prevent new tasks from being scheduled on the node):

docker node update --availability drain <NODE_ID>

12. Promote a worker node to manager status:

docker node promote <NODE_ID>

13. Demote a manager node to worker status:

docker node demote <NODE_ID>

14. Leave the Swarm (run on a node to remove it from the Swarm):

docker swarm leave

15. Leave the Swarm and remove the node from the manager:

docker swarm leave --force

These are some of the common commands used to interact with Docker Swarm. Docker Swarm provides a simple and powerful way to manage containerized applications in a cluster of Docker nodes.