Docker

Docker Compose

Docker Machine

Docker Swarm Slassic

Docker Swarm Mode

SWARM

Introduction

A swarm is a group of machines that are running Docker and joined into a cluster. After that has happened, you continue to run the Docker commands you’re used to, but now they are executed on a cluster by a swarm manager. The machines in a swarm can be physical or virtual. After joining a swarm, they are referred to as nodes.

Source: https://docs.docker.com/get-started/part4/#introduction

docker@manager:~$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
uzhpeg3ug0ip6f9o3l51c749y *   manager             Ready               Active              Leader              18.05.0-ce
kstfblenhtb0dbpzkxo2olssn     worker1             Ready               Active                                  18.05.0-ce
pf8jdfmlegbx7dogi6jnbxu2y     worker2             Ready               Active                                  18.05.0-ce

https://docs.docker.com/engine/swarm/swarm-tutorial/deploy-service/

Create swarm

docker@manager:~$ docker swarm init --advertise-addr 192.168.42.118
Swarm initialized: current node (uzhpeg3ug0ip6f9o3l51c749y) is now a manager.

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

    docker swarm join --token SWMTKN-1-21qaw0xpv9tj2kjxbmj6jn2jqpbcjjkyeze2nno9yy0wvt0vp9-9k2yyit1x8a11ca50ejxalzhz 192.168.42.118:2377

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