Debug School


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Docker Assignment 3- Day 2

What is a docker image?

  • Docker image is a collection of repositories.

  • There could be multiple layers in a docker image.

  • While pulling a docker image we pull the top layer and along with it all the layers linked to it are also pulled.

  • The layers are linked in a parent child fashion, where the second top layer is the parent of top layer and so on.

  • The last layer is the root file system. Each layer is its own file system.

  • When the container is running, all the layers are merged and mounted to the container.

  • When the container is stopped, the merged mount is gone.

  • The changes in the file system of each layer is maintained in a separate diff folder and when the container starts the changes are also merged in the mount.

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