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This is the first line of your Dockerfile, and it's required. You may have multiples of them if you are making multiple builds

FROM image
# or
FROM image:version
# or
FROM image:version as name
  • image: image tag used as a source
  • version: version of the tag, optional
  • name: you can have a lot of from and give them a name, optional


# image is gcc, version is 8.4
FROM gcc:8.4
# image is gcc, version is latest
# you should not use "latest"
FROM gcc:latest