Posted on by Hamida Rebai

Deploy an Application for Azure Container Registry

Overview Docker Container and Image

Introduction to Docker Images

Docker is a tool that makes it easier to create, deploy, and run applications by using a containerization approach. These containers are lightweight and take less time to start than traditional servers. These containers also increase performance and lower cost, while offering proper resource management. Another benefit to using Docker is that you no longer need to pre-allocate RAM to each container.

Docker Container and Docker Image

A Docker container is a virtualized runtime environment used in application development. As mentioned before in the definition of Docker, with Docker, we are able to create, run and deploy applications that are isolated from the underlying hardware. A Docker container can use just one machine, share its kernel and virtualize the OS to run more isolated processes. So, Docker containers are lightweight.

A Docker image is like a snapshot in other types of VM environments. It is a record of a Docker container at a specific point in time. Docker images are also immutable. While they can’t be changed, they can be duplicated, shared, or deleted. The feature is useful for testing new software or configurations because whatever happens, the image remains unchanged.