Lab 3: Inspecting Health and State of Your Cluster in Docker Swarm

The Service concept allows you to inspect the health and state of your cluster and the running applications.

Task

You can view the list of all the tasks associated with a service across the cluster. In this case, each task is a container,

docker service ps http

You can view the details and configuration of a service via

docker service inspect --pretty http

On each node, you can ask what tasks it is currently running. Self refers to the manager node Leader:

docker node ps self

Using the ID of a node you can query individual hosts

docker node ps $(docker node ls -q | head -n1)

In the next step, we will scale the service to run more instances of the container.