Managers run the swarm cluster, making sure nodes can communicate with each other, allocate applications to different nodes, and handle a variety of other tasks in the cluster. Swarm mode uses managers and workers to run your applications. After joining a swarm, they are referred to as nodes. The machines in a swarm can be physical or virtual. After that has happened, you continue to run the Docker commands youвЂ™re used to, but now they are executed on a cluster by a swarm manager. Docker Desktop is the easiest way to get started with either Swarm or Kubernetes.ДЄ swarm is a group of machines that are running Docker and joined into a cluster. If you've read anything about Docker, you have probably heard of Kubernetes and Docker swarm mode. While it is easy to run an application in isolation on a single machine, orchestration allows you to coordinate multiple machines to manage an application, with features like replication, encryption, load balancing, service discovery and more.

To run it, open a command line and navigate to the same directory as the docker-compose.yml file. It also specifies the password, which you wouldnвЂ™t want to do in a real world situation. ThereвЂ™s a lot of details in there but basically you can see that it specifies the images to be used, the service names, the ports available, and networks the different services are on. To try it out, open a text editor and paste the text from this file. Docker Compose handles service discovery directly, allowing the app to reference the service directly and Docker will route traffic to the right container. WeвЂ™ve pushed two images to the Docker Hub under the dockersamples repo. You can check out the app in our dockersamples GitHub repo. This sample uses a simple Java web app running in Tomcat with a MySQL database. Docker Compose installs automatically with Docker Desktop.ДЄ multi-container app is an app that has multiple containers running and communicating with each other. Then, with a single command, you create and start all the services from your configuration. With Compose, you use a YAML file to configure your applicationвЂ™s services. Easily connect multiple services togetherДocker Compose is a tool for defining and running multi-container Docker applications.

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