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Docs: Fix instructions for enabling Docker Buildkit

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Docker Buildkit must be enabled via `/etc/default/dokku`. It cannot be enabled via `dokku config` because those variables are not made available during the `build` phase of Docker containers for security reasons (see https://dokku.com/docs/deployment/builders/dockerfiles/#build-time-configuration-variables).

See: https://github.com/dokku/dokku/pull/4723#issuecomment-927381185
This commit is contained in:
Finn Woelm
2021-09-28 21:11:09 +02:00
committed by GitHub
parent 597fb7d219
commit eadf9f1f8e
1 changed files with 2 additions and 6 deletions
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8
docs/deployment/builders/dockerfiles.md
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@@ -148,12 +148,8 @@ RUN echo $NODE_ENV
If your Dockerfile is using Docker engine's [buildkit](https://docs.docker.com/develop/develop-images/build_enhancements/) (not to be confused with buildpacks), then the `DOCKER_BUILDKIT=1` environment variable needs to be set. Additionally, complete build log output can be forced via `BUILDKIT_PROGRESS=plain`. Both of these environment variables can be set as follows:
```shell
# via config:set
dokku config:set --global DOCKER_BUILDKIT=1 BUILDKIT_PROGRESS=plain
# on the /etc/default/dokku file
echo DOCKER_BUILDKIT=1 | sudo tee -a /etc/default/dokku
echo BUILDKIT_PROGRESS=plain | sudo tee -a /etc/default/dokku
echo "export DOCKER_BUILDKIT=1" | sudo tee -a /etc/default/dokku
echo "export BUILDKIT_PROGRESS=plain" | sudo tee -a /etc/default/dokku
```
#### Buildkit directory caching