What is docker image?

DevOps

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  • Docker image is template used to build the docker containers
  • Docker image contains application code, tools, dependencies and other files needed to make an application run
  • Docker images are store in docker registry
  • Docker images have multiple layers(base image, parent image, Layers), each one originates from the previous layer but is different from it
  • The layered file systems are identified using UUID which are created using SHA256 algorithm.
  • When we create a container – all layers are merged into 1 layer and that get mounted to container.
  • Docker merged directory is created when docker container process is started and it is removed when the container is stopped.