What is Docker Images and Explain in 10 bullet lines?

  • Collection of file systems, ROOTFS, APPFS, USERFS.
  • One copy of docker image can attach to many containers.
  • From one image multiple containers can be created
  • File system layered over each other.
  • Higher layer wins.
  • Each layer is each File system
  • Layer 0 should be base image or Root FS
  • Once image is attached to container, these layers will be attached to the container as a single layer
  • The layers in the image will be in read only format, and to have the changes the thin layer in container should be used and commit that and form a new image