docs: cleanup deployment-tasks.md and plugins.md
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Sometimes you need to run a command on deployment time, but before an app is completely deployed. Common use cases include:
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* Checking a database is initialized
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* Running database migrations
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* Any commands required to set up the server (e.g. something like a Django `collectstatic`)
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- Checking a database is initialized
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- Running database migrations
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- Any commands required to set up the server (e.g. something like a Django `collectstatic`)
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To support this, Dokku provides support for a special `release` command within your app's `Procfile`, as well as a special `scripts.dokku` key inside of your app's `app.json` file. Be aware that all commands are run within the context of the built docker image - no commands affect the host unless there are volume mounts attached to your app.
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Each "phase" has different expectations and limitations:
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- `app.json`: `scripts.dokku.predeploy`
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- When to use: This should be used if your app does not support arbitrary build commands and you need to make changes to the built image.
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- Are changes committed to the image at this phase: Yes
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- Example use-cases
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- Bundling assets in a slightly different way
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- Installing a custom package from source or copying a binary into place
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- When to use: This should be used if your app does not support arbitrary build commands and you need to make changes to the built image.
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- Are changes committed to the image at this phase: Yes
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- Example use-cases
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- Bundling assets in a slightly different way
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- Installing a custom package from source or copying a binary into place
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- `app.json`: `scripts.dokku.postdeploy`
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- When to use: This should be used in conjunction with external systems to signal the completion of your deploy.
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- Are changes committed to the image at this phase: No
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- Example use-cases
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- Notifying slack that your app is deployed
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- Coordinating traffic routing with a central load balancer
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- When to use: This should be used in conjunction with external systems to signal the completion of your deploy.
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- Are changes committed to the image at this phase: No
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- Example use-cases
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- Notifying slack that your app is deployed
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- Coordinating traffic routing with a central load balancer
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- `app.json`: `scripts.postdeploy`
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- When to use: This should be used when you wish to run a command _once_, after the app is created and not on subsequent deploys to the app.
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- Are changes committed to the image at this phase: No
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- Example use-cases
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- Setting up OAuth clients and DNS
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- Loading seed/test data into the app’s test database
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- When to use: This should be used when you wish to run a command _once_, after the app is created and not on subsequent deploys to the app.
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- Are changes committed to the image at this phase: No
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- Example use-cases
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- Setting up OAuth clients and DNS
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- Loading seed/test data into the app’s test database
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- `Procfile`: `release`
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- When to use: This should be used in conjunction with external systems to signal the completion of your app image build.
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- Are changes committed to the image at this phase: No
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- Example use-cases
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- Sending CSS, JS, and other assets from your app’s slug to a CDN or S3 bucket
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- Priming or invalidating cache stores
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- Running database migrations
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- When to use: This should be used in conjunction with external systems to signal the completion of your app image build.
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- Are changes committed to the image at this phase: No
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- Example use-cases
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- Sending CSS, JS, and other assets from your app’s slug to a CDN or S3 bucket
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- Priming or invalidating cache stores
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- Running database migrations
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Additionally, if using a Dockerfile with an `ENTRYPOINT`, the deployment task is passed to that entrypoint as is. The exceptions are if the entrypoint is one of the following:
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@@ -54,8 +54,8 @@ Please keep the above in mind when utilizing deployment tasks.
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Dokku provides limited support for the `app.json` manifest from Heroku (documentation available [here](https://devcenter.heroku.com/articles/app-json-schema)). The keys available for use with Deployment Tasks are:
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- `scripts.dokku.predeploy`: This is run _after_ an app's docker image is built, but _before_ any containers are scheduled. Changes made to your image are committed at this phase.
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- `scripts.dokku.postdeploy`: This is run _after_ an app's containers are scheduled. Changes made to your image are *not* committed at this phase.
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- `scripts.postdeploy`: This is run _after_ an app's containers are scheduled. Changes made to your image are *not* committed at this phase.
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- `scripts.dokku.postdeploy`: This is run _after_ an app's containers are scheduled. Changes made to your image are _not_ committed at this phase.
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- `scripts.postdeploy`: This is run _after_ an app's containers are scheduled. Changes made to your image are _not_ committed at this phase.
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For buildpack-based deployments, the location of the `app.json` file should be at the root of your repository. Dockerfile-based app deploys should have the `app.json` in the configured `WORKDIR` directory; otherwise Dokku defaults to the buildpack app behavior of looking in `/app`.
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@@ -87,6 +87,6 @@ To use the `release` command, simply add a `release` stanza to your Procfile.
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release: curl https://some.external.api.service.com/deployment?state=built
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```
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Unlike the `scripts.dokku.predeploy` command, changes made during by the `release` command are *not* persisted to disk.
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Unlike the `scripts.dokku.predeploy` command, changes made during by the `release` command are _not_ persisted to disk.
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> Warning: scaling the release command up will likely result in unspecified issues within your deployment, and is highly discouraged.
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