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dockerdockerhub
Tomer Shukhman
Tomer Shukhman

Reputation: 47

How does docker pull work when there are tags with multiple digests (for os/arch)

I was wondering how does docker pull work (specifically from docker hub) When i was looking at a tag of an image e.g nodejs image and noticed the os/arch in there there were multiple. When i run docker pull how does it choose which one to get?

Upvotes: 4

Views: 927

Answers (1)

J. Scott Elblein
J. Scott Elblein

Reputation: 4253

Multi-arch images are built into the Dockerfile/manifests. At build time the respective arch files are copied over, and when pulling, the daemon determines which to use.

Here's a reference of the actual process of building a multi-arch image:

https://lobradov.github.io/Building-docker-multiarch-images/#how-does-it-work

When you're looking at a page like you linked, where you can select an arch from the drop-down, that's showing the list of available archs that the image maintainer added to that image via the process mentioned in the link I referenced.

Upvotes: 1

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