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$ sudo apt-get update
$ sudo apt-get install docker.io

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$ sudo docker swarm init

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Swarm initialized: current node (xxxx) is now a manager.
To add a worker to this swarm, run the following command:
 docker swarm join --token xxxxxxxx

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$ sudo docker swarm join --token xxxxxxxx

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$ sudo docker node ls

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ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
xxxxx   node1               Ready               Active              Reachable           19.03.13
xxxxx   node2               Ready               Active              Leader              19.03.13

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$ sudo docker network create -d overlay my_network

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$ sudo docker service create --name my_nginx --network my_network --publish 8080:80 nginx

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$ sudo docker service ls

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ID                  NAME                MODE                REPLICAS            IMAGE               PORTS
xxxxx   my_nginx           replicated          1/1                 nginx:latest        *:8080->80/tcp

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$ sudo docker service scale my_nginx=3

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