Gain insights into Docker Compose, Docker Swarm, and Docker Networking. Explore app deployment, multi-container management, and security tools to thrive in the cloud-first environment.

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If you want to thrive in the modern cloud-first world, you need to know Docker. But don’t stress, this course will give you all the skills you need.

To kick things off, you will learn how to deploy apps with Docker Compose, a key tool for managing multi-container applications running in single-engine mode. You will then move onto Docker Swarm which will allow you to stand up containers and orchestrate them at scale.

Towards the back half of the course, you will take a deep dive into Docker Networking, deploying apps with Docker Stacks, and some of the industry tools used for keeping Docker secure.

By the end of this course, you will be equipped with the knowledge and tools to run Docker at scale, no matter how many containers you have.

Docker Deep Dive: Advanced Techniques

# Swarm nodes
On the clustering front, a *swarm* consists of one or more Docker *nodes*. These can be physical servers, VMs, Raspberry Pi's, or cloud instances. The only requirement is that all nodes have Docker installed and can communicate over reliable networks.

> **Terminology:** When referring to the _Docker Swarm_ technology, we'll write _Swarm_ with an uppercase "S". When referring to a swarm as a cluster of nodes, we'll use a lowercase "s".


## Managers and workers
Every node in a swarm is either a manager or a worker.
- Managers run the _control plane_ services that maintain the state of the cluster and schedule user applications to workers
- Workers run user applications

Swarm runs user applications on managers and workers in a default installation. However, you can force user applications to run on worker nodes on important clusters, allowing your managers to focus on cluster management operations.

The swarm stores its state and configuration in an in-memory distributed database that replicates across all manager nodes. Fortunately, it's automatically configured when you create the swarm and takes care of itself.




# Swarm security
Swarm uses TLS to encrypt communications, authenticate nodes, and authorize roles (managers and workers). It also configures and performs automatic key rotation. And as with the cluster store, it's automatically configured when you create the swarm and takes care of itself.

The figure below shows a high-level view of a swarm with three managers, three workers, and a distributed cluster store replicated across all three managers.






Let's take a bird's-eye view of Docker Swarm.

About the Course

Multi-container Apps with Compose

Docker Swarm

Deploying Applications with Docker Stacks

Docker and WebAssembly

Docker Networking

Docker Overlay Networking

Volumes and Persistent Data

Docker Security

What Next

Appendix: Getting Docker and Compose

How Swarm Primer Works

Swarm nodes