What is Docker?

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.