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docs: explain sha256 image digest alternative when reusing docker image tags for git:from-image deployments

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Jose Diaz-Gonzalez
2021-10-05 13:48:12 -04:00
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commit 92524c2da0
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13
docs/deployment/methods/git.md
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@@ -135,7 +135,18 @@ In the above example, Dokku will build the app as if the repository contained _o
FROM dokku/node-js-getting-started:latest
```
Triggering a build with the same arguments multiple times will result in Dokku exiting `0` early as there will be no changes detected.
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
docker inspect --format='{{index .RepoDigests 0}}' $IMAGE_NAME
```
The resulting `git:from-image` call would then be:
```shell
# where the image sha is: sha256:9d187c3025d03c033dcc71e3a284fee53be88cc4c0356a19242758bc80cab673
dokku git:from-image node-js-app dokku/node-js-getting-started:@sha256:9d187c3025d03c033dcc71e3a284fee53be88cc4c0356a19242758bc80cab673
```
The `git:from-image` command can optionally take a git `user.name` and `user.email` argument (in that order) to customize the author. If the arguments are left empty, they will fallback to `Dokku` and `automated@dokku.sh`, respectively.