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Sep 29, 2021
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Added a comment about Dockerfile deployment #4808

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A comment about Dockerfile deployment.
francipvb Sep 29, 2021
44a43cb
docs: update note to clarify how port mapping works for Dockerfile apps
josegonzalez Sep 29, 2021
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19 changes: 19 additions & 0 deletions docs/getting-started/troubleshooting.md
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Expand Up @@ -64,6 +64,25 @@ Save the file and try stopping nginx and starting it again:
## * Starting nginx nginx [ OK ]
```

---

Using the `EXPOSE` directive in a Dockerfile may be another reason why you might see the default site. When the `EXPOSE` directive is in use and a proxy plugin is enabled (the default), the proxy plugin will listen to requests on the ports specified in the `EXPOSE` stanza.

For example, if you have an `EXPOSE` directive like so:

```Dockerfile
EXPOSE 8000
```

The proxy port mapping will be `http:8000:8000`.

To avoid this issue, either of the following can be done:

- Remove `EXPOSE` directive: This will require respecting the `$PORT` environment variable (automatically set by Dokku). Once that change is deployed, the port mapping should be cleared via the `dokku proxy:ports-clear $APP` command (where `$APP` is your app name).
- Update the port mapping: Updating the port mapping to redirect port `80` to your app's exposed port via `dokku proxy:ports-set $APP http:80:$EXPOSED_PORT` can also fix the issue. This will also allow certificate management and the letsencrypt plugin to work correctly.

See the [port management documentation](/docs/networking/port-management.md) for more information on how Dokku exposes ports for applications and how you can configure these for your app.

### I want to deploy my app, but while pushing I get the following error

The following error may be emitted from a deploy:
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