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Deploy a service to the Swarm

After you create a swarm, you can deploy a service to the swarm. We have a 3 node swarm cluster but that is not a requirement for deploying services, you can deploy a service on a single node cluster too.

The command used for deploying a service is docker service create.

Open a terminal and ssh into the manager node and run the following command:

manager:~$ docker service create --replicas 1 --name helloworld alpine ping google.com
xvdsz9zwjfwwkbu4e4mp15xbg
  • The docker service create command creates the service.
  • The --name flag names the service helloworld. (OPTIONAL)
  • The --replicas flag specifies the desired number of running instances. (OPTIONAL)
  • The argument alpine is the name of docker image to be used.
  • The argument ping google.com define the command to be executed by the service.

Run docker service ls to see the list of running services:

manager:~$ docker service ls
ID                  NAME                MODE                REPLICAS            IMAGE
xvdsz9zwjfww        helloworld          replicated          1/1                 alpine:latest

The REPLICAS column shows that 1/1 replicas are running for service with NAME helloworld. Also the ID column is the service ID which was returned on docker service create command.

In the next chapter we see how to inspect a service.