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--- gitlab-ci-multiplatform [2021/01/08 08:04] – [Create buildx image to use] baumi
+++ gitlab-ci-multiplatform [2021/01/09 10:07] (current) – [Enable Emulators] baumi
@@ Line 1: / Line 1: @@
 ====== Gitlab CI MultiPlatform Build ======
-===== Enable Emulators =====
+===== Enable binary formats =====
-<code>
+<code bash>
-# docker run -it --rm --privileged tonistiigi/binfmt --install all
+$ docker run --rm --privileged tonistiigi/binfmt --install all
 {
   "supported": [
@@ Line 24: / Line 24: @@
 }
 </code>
+===== Create buildx enabled docker image for builds =====
-===== Create buildx image to use =====
 <file bash Dockerfile>
 ARG BUILDX_VERSION=0.4.2
@@ Line 46: / Line 45: @@
 COPY --from=fetcher /docker-buildx /usr/lib/docker/cli-plugins/docker-buildx
 </file>
-===== Configure gitlab-runner =====
-===== Utilize own buildx image and switch to buildx in .gitlab-ci.yml =====
+Credits to [[https://github.com/jdrouet|Jérémie Drouet]]
+==== Build & push image ====
+<code bash>
+$ docker build --pull -t registry/docker-with-buildx .
+$ docker push registry/docker-with-buildx
+</code>
+===== Switch to buildx in .gitlab-ci.yml =====
+Define CI_PLATFORMS variable in Settings / CI/CD:
+CI_PLATFORMS = linux/amd64,linux/arm/v7,...
+<file bash .gitlab-ci.yml>
+image: registry/docker-with-buildx
+services:
+  - docker:dind
+build:
+  stage: build
+  script:
+    - docker login -u $CI_USER -p $CI_TOKEN $CI_REGISTRY
+    - docker buildx create --use
+    - docker buildx build --platform $CI_PLATFORMS --push --pull -t $CI_REGISTRY_IMAGE .
+</file>
+{{tag>kb git}}