Jack Wallen shows you how to deploy a service to a Docker Swarm cluster, so you can scale those apps up and down.

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EDITOR'S NOTE: This content was originally published March 2023 on TechRepublic. This information may be outdated depending on time of viewing.

Footage courtesy of TechRepublic.

Commands:

Deploy an NGINX service:
docker service create --name nginx_test nginx

Check the status of the service, issue the command:
docker service ls

Deploy that service to all three nodes:
docker service create --replicas 3 --name nginx3nodes nginx

Verify the 3-node scale, issue the command:
docker service ls

Scale down that service to 2 cluster nodes with the command:
docker service scale nginx3nodes=2

Check the status with:
docker service ls

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