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Update command used to retrieve image digest when image is not pushed to a registry #5958

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merged 2 commits into from
Sep 10, 2023
Merged

Update command used to retrieve image digest when image is not pushed to a registry #5958

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848c54c
Fix command to get docker image digest
gamedevsam Jun 22, 2023
5c2bb44
docs: clarify when to use a particular method to retrieve the sha256 …
josegonzalez Sep 10, 2023
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11 changes: 11 additions & 0 deletions docs/deployment/methods/git.md
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Expand Up @@ -142,7 +142,12 @@ If the specified image already exists on the Dokku host, it will not be pulled a
Triggering a build with the same arguments multiple times will result in Dokku exiting `0` early as there will be no changes detected. If the image tag is reused but the underlying image is different, it is recommended to use the image digest instead of the tag. This can be retrieved via the following command:

```shell
# for images pushed to a remote registry
docker inspect --format='{{index .RepoDigests 0}}' $IMAGE_NAME

# for images built locally and not pushed to a registry
# use when the previous command output is empty
docker images --no-trunc --quiet $IMAGE_NAME
```

The resulting `git:from-image` call would then be:
Expand Down Expand Up @@ -232,7 +237,13 @@ FROM dokku/node-js-getting-started:latest
When deploying an app via `git:load-image`, it is highly recommended to use a unique image tag when building the image. Not doing so will result in Dokku exiting `0` early as there will be no changes detected. If the image tag is reused but the underlying image is different, it is recommended to use the image digest instead of the tag. This can be retrieved via the following command:

```shell

# for images pushed to a remote registry
docker inspect --format='{{index .RepoDigests 0}}' $IMAGE_NAME

# for images built locally and not pushed to a registry
# use when the previous command output is empty
docker images --no-trunc --quiet $IMAGE_NAME
```

The resulting `git:load-image` call would then be:
Expand Down