Docker is a runtime for containers. Docker is significant to the container and development communities because it made utilising containers so simple that everyone started doing it. It helps programmers to bundle applications into containers, which are standardised executable parts that include the application source code along with the OS libraries and dependencies necessary to run that code in any setting.
We may isolate specific kernel processes using the technique known as containers, which make them believe they are the only ones running on a brand-new computer. In contrast to virtual machines, a container can share the operating system’s kernel while merely loading its various binaries and libraries. Containers make it easier to deliver distributed applications, and as businesses move toward cloud-native development and hybrid multicloud setups, they are gaining popularity.
Docker was developed in 2010 by Solomon Hykes and Sebastien Pahl as part of the Y Combinator startup incubation network. The platform was introduced in 2011.
Because Docker standardised the use of containers globally after 2013, several businesses adopted it as the default container runtime. Red Hat announced a Docker partnership in 2013; in 2014, it was Microsoft, AWS, Stratoscale, and IBM’s turn. The first Docker release for an operating system other than Linux was announced in 2016. A Windows-compatible port of Docker’s OSS project was made available by Windocks. By the year’s conclusion, Microsoft also revealed that Hyper-V now natively supported Docker on Windows.
A CLI is the interface we use to make all of this available. Docker is made up of a Daemon, which is used to construct, execute, and manage the containers, a high-level API, which allows the user to connect with the Daemon.
A straightforward text file with instructions on how to create the Docker container image is the first thing that Docker does when creating a new container. The process of producing a Docker image is automated using DockerFile.
In addition to the executable application source code required to run as a container, Docker images also include the necessary tools, libraries, and dependencies. One or more instances of the container are created when the Docker image is run.
Any desktop, data centre, and cloud environment can use Docker containers without any modifications. Each Docker container can only run one process at a time. This makes it feasible to create applications that can function even while one of their components is offline for maintenance or repair. Based on the source code of an application, Docker can automatically create a container.
Docker has the ability to log changes made to a container image, revert to a previous version, and discover who made a version and how. Even just the differences between an existing version and a new version might be uploaded.