This assumes you have installed Docker on Linux and the Docker is running. The docker swarm init command is used to initialize Docker Swarm.

docker swarm init

The docker swarm init command should return the following output.

Swarm initialized: current node (i9m11i1q147k8x09khye6ip8b) is now a manager.

 To add a worker to this swarm, run the following command:

     docker swarm join \
     --token SWMTKN-1-61s10q7nisntaqdqj13z9sjutvvew2kpfc3wpc50zqtr9bhj5k-6ppeqc2x9gt1sf6hi80b9wch5 \ 
     192.168.0.15:2377

 To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.