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document wait

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Jason Hall 2021-04-09 12:38:33 -04:00
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cmd/wait/README.md
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@ -29,3 +29,13 @@ This screencast requests an image that should exist in five seconds, then waits
to see it appear and checks that it's valid.
[![asciicast](https://asciinema.org/a/JUiiq33BaGF3NGx10PP6uvETf.svg)](https://asciinema.org/a/JUiiq33BaGF3NGx10PP6uvETf)
## Why?
This demonstrates being able to asynchronously produce an image, rather than
blocking the initial pull HTTP request until the image is available.
A container orchestrator like Kubernetes would pull this image and report
`ImagePullBackoff` until the image was finally served, at which point it would
pull and run it. In the meantime, the registry could be building or mirroring
or modifying the image in the background.