Introduction To Docker Container?

Introduction To Docker Container?

A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. 

A docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings. Container images become containers at runtime and in the case of docker containers – images become containers when they run on docker Engine. They are available for both Linux and Windows-based applications. 

Containerized software will always run the same, regardless of the infrastructure. Containers isolate software from its environment and ensure that it works uniformly despite differences for instance between development and staging. 

Containerization is increasingly popular because containers are:

- Flexible: Even the most complex applications can be containerized.

- Lightweight: Containers leverage and share the host kernel, making them much more efficient in terms of system resources than virtual machines.

- Portable: You can build locally, deploy to the cloud, and run anywhere.

- Loosely coupled: Containers are highly self sufficient and encapsulated, allowing you to replace or upgrade one without disrupting others.

- Scalable: You can increase and automatically distribute container replicas across a datacenter.

- Secure: Containers apply aggressive constraints and isolations to processes without any configuration required on the part of the user.