Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker, you can manage your infrastructure in …

Docker Engine is an open source containerization technology for building and containerizing your applications. Docker Engine acts as a client-server application with: A server with a long-running daemon process dockerd. APIs which specify interfaces that programs can use to talk to and instruct the Docker daemon.

If you're new to Docker, this section guides you through the essential resources to get started. Follow the guides to help you get started and learn how Docker can optimize your development workflows. For more advanced concepts and scenarios in Docker, see Guides. Foundations of Docker. Install Docker and jump into discovering what Docker is.

Docker Documentation is the official Docker library of resources, manuals, and guides to help you containerize applications.

With Docker Compose you use a YAML configuration file, known as the Compose file, to configure your application’s services, and then you create and start all the services from your configuration with the Compose CLI.

To deploy an application image when Docker Engine is in Swarm mode, you create a service. Frequently a service is the image for a microservice within the context of some larger application. Examples of services might include an HTTP server, a database, or any other type of executable program that you wish to run in a distributed environment.

Docker daemons can participate in a swarm as managers, workers, or both. In the same way that you can use Docker Compose to define and run containers, you can define and run Swarm service stacks. Keep reading for details about concepts related to Docker swarm services, including nodes, services, tasks, and load balancing.

This page describes networking from the point of view of the container, and the concepts around container networking. This page doesn't describe OS-specific details about how Docker networks work. For information about how Docker manipulates iptables rules on Linux, see Packet filtering and firewalls. User-defined networks

When you build the same Docker image multiple times, knowing how to optimize the build cache is a great tool for making sure the builds run fast. How the build cache works. Understanding Docker's build cache helps you write better Dockerfiles that result in faster builds. The following example shows a small Dockerfile for a program written in C.

Docker Compose solves the problem of managing multi-container Docker applications by providing a simple way to define, configure, and run all the containers needed for an application using a single YAML file.