Two characteristics of docker images

What is a Docker image?

To simply understand, the Docker image is a Linux file system (Root FileSystem). This file system contains programs that can run in the Linux kernel and corresponding data.

Two characteristics of the image:

1. The image is layered

That is, an image can be composed of multiple intermediate layers. Multiple images can share the same middle layer, and we can also generate a new image by adding one more layer to the image.

2. The image is read-only

After the image is built, it cannot be modified. As we said above, adding a layer to build a new image, In the process, a temporary container is actually created, and files are added or deleted on the container to form a new image, because the container can be changed dynamically.

Recommended tutorial: docker tutorial

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