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add info about pulling from image digest (#4508)

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* add info about pulling from image digest

* fix nits
This commit is contained in:
Jennifer Rondeau
2017-07-26 15:53:21 -04:00
committed by Ahmet Alp Balkan
parent 04776838c9
commit 036f35b891
1 changed files with 3 additions and 1 deletions
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docs/concepts/configuration/overview.md
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@@ -77,7 +77,9 @@ This is a living document. If you think of something that is not on this list bu
That is, if you're specifying an image with other than the `:latest` tag, for example `myimage:v1`, and there is an image update to that same tag, the Kubelet won't pull the updated image. You can address this by ensuring that any updates to an image bump the image tag as well (for example, `myimage:v2`), and ensuring that your configs point to the correct version.
**Note:** you should avoid using `:latest` tag when deploying containers in production, because this makes it hard to track which version of the image is running and hard to roll back.
**Note:** You should avoid using `:latest` tag when deploying containers in production, because this makes it hard to track which version of the image is running and hard to roll back.
- To work only with a specific version of an image, you can specify an image with its digest (SHA256). This approach guarantees that the image will never update. For detailed information about working with image digests, see [the Docker documentation](https://docs.docker.com/engine/reference/commandline/pull/#pull-an-image-by-digest-immutable-identifier).
## Using kubectl