linux - Simple Docker Concept -


i'm going through getting started docker guide , understood of basics except 1 concept.

docker images screenshot

i how docker/whalesay takes 247 mb. needs download few layers, including base image of ubuntu. hello-world should around same size? it's self-contained image can shipped anywhere.

when hello-world executes, there's still linux layer running somewhere, , downloaded hello-world before docker/whalesay couldn't have been using linux layer downloaded docker/whalesay. missing here?

it not ubuntu instance. check hub: https://hub.docker.com/_/hello-world/

here if click on latest, can see dockerfile:

from scratch copy hello / cmd ["/hello"]

the defines operating system based on. scratch "empty" image, described here: https://hub.docker.com/_/scratch/


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