Docker is available in two editions:
- Community Edition (CE)
- Enterprise Edition (EE)
Docker Community Edition (CE) is ideal for individual developers and small teams looking to get started with Docker and experimenting with container-based apps.
Docker Enterprise Edition (EE) is designed for enterprise development and IT teams who build, ship, and run business critical applications in production at scale.
|Docker Engine – Community
|Docker Engine – Enterprise
|Container engine and built in orchestration, networking, security
|Certified infrastructure, plugins and ISV containers
|Container app management
|Image security scanning
Docker is a platform for developers and sysadmins to develop, deploy, and run applications with containers. The use of Linux containers to deploy applications is called containerization. Containers are not new, but their use for easily deploying applications is.
Containerization is increasingly popular because containers are:
- Flexible: Even the most complex applications can be containerized.
- Lightweight: Containers leverage and share the host kernel.
- Interchangeable: You can deploy updates and upgrades on-the-fly.
- Portable: You can build locally, deploy to the cloud, and run anywhere.
- Scalable: You can increase and automatically distribute container replicas.
- Stackable: You can stack services vertically and on-the-fly.
Features of Docker
- Docker has the ability to reduce the size of development by providing a smaller footprint of the operating system via containers.
- With containers, it becomes easier for teams across different units, such as development, QA and Operations to work seamlessly across applications.
- You can deploy Docker containers anywhere, on any physical and virtual machines and even on the cloud.
- Since Docker containers are pretty lightweight, they are very easily scalable.
Components of Docker
Docker has the following components
- Docker for Mac − It allows one to run Docker containers on the Mac OS.
- Docker for Linux − It allows one to run Docker containers on the Linux OS.
- Docker for Windows − It allows one to run Docker containers on the Windows OS.
- Docker Engine − It is used for building Docker images and creating Docker containers.
- Docker Hub − This is the registry which is used to host various Docker images.
- Docker Compose − This is used to define applications using multiple Docker containers.
The standard and traditional architecture of virtualization:
- The server is the physical server that is used to host multiple virtual machines.
- The Host OS is the base machine such as Linux or Windows.
- The Hypervisor is either VMWare or Windows Hyper V that is used to host virtual machines.
- You would then install multiple operating systems as virtual machines on top of the existing hypervisor as Guest OS.
- You would then host your applications on top of each Guest OS.
The new generation of virtualization that is enabled via Dockers:
- The server is the physical server that is used to host multiple virtual machines. So this layer remains the same.
- The Host OS is the base machine such as Linux or Windows. So this layer remains the same.
- Now comes the new generation which is the Docker engine. This is used to run the operating system which earlier used to be virtual machines as Docker containers.
- All of the Apps now run as Docker containers.
The clear advantage in this architecture is that you don’t need to have extra hardware for Guest OS. Everything works as Docker containers.
- Docker Configuration — After installing Docker and starting Docker, the dockerd daemon runs with its default configuration. This page gathers resources on how to customize the configuration, start the daemon manually, and troubleshoot and debug the daemon if run into issues.
- Collecting Docker Metrics — In order to get as much efficiency out of Docker as possible, we need to track Docker metrics. Monitoring metrics is also important for troubleshooting problems. This page gathers resources on how to collect Docker metrics with tools like Prometheus, Grafana, InfluxDB and more.
- Starting and Restarting Docker Containers Automatically — Docker provides restart policies to control whether your containers start automatically when they exit, or when Docker restarts. Restart policies ensure that linked containers are started in the correct order. This page gathers resources about how to automatically start Docker containers on boot or after server crash.
- Managing Container Resources — Resource management for Docker containers is a huge requirement for production users. It is necessary for running multiple containers on a single host in an efficient way and to ensure that one container does not starve the others in terms of cpu, memory, io, or networking. This page gathers resources about how to improve Docker performance by managing it’s resources.
- Controlling Docker With systemd — Systemd provides a standard process for controlling programs and processes on Linux hosts. One of the nice things about systemd is that it is a single command that can be used to manage almost all aspects of a process. This page gathers resources about how to use systemd with Docker daemon service.
- Docker CLI Commands — There are a large number of Docker client CLI commands, which provide information relating to various Docker objects on a given Docker host or Swarm cluster. Generally, this output is provided in a tabular format. This page gathers resources about how the Docker CLI Work, CLI Tips and Tricks and basic Docker CLI commands.
- Docker Logging — Logs tell the full story of what is happening, or what happened at every layer of the stack. Whether it’s the application layer, the networking layer, the infrastructure layer, or storage, logs have all the answers. This page gathers resources about working with Docker logs, how to manage and implement Docker logs and more.
- Troubleshooting Docker Engine — Docker makes everything easier. But even with the easiest platforms, sometimes you run into problems. This page gathers resources about how to diagnose and troubleshoot problems, send logs, and communicate with the Docker Engine.
- Docker Orchestration – Tools and Options — To get the full benefit of Docker containers, you need software to move containers around in response to auto-scaling events, a failure of the backing host, and deployment updates. This is container orchestration. This page gathers resources about Docker orchestration tools, fundamentals and best practices.
A good summary of what Docker does is included in its very own motto: Build , Ship , Run.
- Build – Docker allows you to compose your application from microservices, without worrying about inconsistencies between development and production environments, and without locking into any platform or language.
- Ship – Docker lets you design the entire cycle of application development, testing, and distribution, and manage it with a consistent user interface.
- Run – Docker offers you the ability to deploy scalable services securely and reliably on a wide variety of platforms.
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