From eadf9f1f8eae7c1bb2a90508d5018f2243136ad8 Mon Sep 17 00:00:00 2001
From: Finn Woelm <7606194+FinnWoelm@users.noreply.github.com>
Date: Tue, 28 Sep 2021 21:11:09 +0200
Subject: [PATCH] Docs: Fix instructions for enabling Docker Buildkit

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
---
 docs/deployment/builders/dockerfiles.md | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/docs/deployment/builders/dockerfiles.md b/docs/deployment/builders/dockerfiles.md
index 3bb77431a..841e79e2a 100644
--- a/docs/deployment/builders/dockerfiles.md
+++ b/docs/deployment/builders/dockerfiles.md
@@ -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