Build container images for ARM32v7 and ARM64v8

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

.circleci/config.yml

@@ -85,11 +85,11 @@ jobs:
     - image: circleci/golang
     steps:
     - checkout
-    - setup_remote_docker
+    - setup_remote_docker:
+        version: 18.06.0-ce
+    - run: docker run --privileged linuxkit/binfmt:v0.6
     - attach_workspace:
         at: .
-    - run: ln -s .build/linux-amd64/alertmanager alertmanager
-    - run: ln -s .build/linux-amd64/amtool amtool
     - run: make docker
     - run: make docker DOCKER_REPO=quay.io/prometheus
     - run: docker images
@@ -97,13 +97,17 @@ jobs:
     - run: docker login -u $QUAY_LOGIN -p $QUAY_PASSWORD quay.io
     - run: make docker-publish
     - run: make docker-publish DOCKER_REPO=quay.io/prometheus
+    - run: make docker-manifest
+    - run: make docker-manifest DOCKER_REPO=quay.io/prometheus
 
   docker_hub_release_tags:
     docker:
     - image: circleci/golang
     steps:
     - checkout
-    - setup_remote_docker
+    - setup_remote_docker:
+        version: 18.06.0-ce
+    - run: docker run --privileged linuxkit/binfmt:v0.6
     - run: mkdir -v -p ${HOME}/bin
     - run: curl -L 'https://github.com/aktau/github-release/releases/download/v0.7.2/linux-amd64-github-release.tar.bz2' | tar xvjf - --strip-components 3 -C ${HOME}/bin
     - run: echo 'export PATH=${HOME}/bin:${PATH}' >> ${BASH_ENV}
@@ -116,19 +120,23 @@ jobs:
     - store_artifacts:
         path: .tarballs
         destination: releases
-    - run: ln -s .build/linux-amd64/alertmanager alertmanager
-    - run: ln -s .build/linux-amd64/amtool amtool
     - run: make docker DOCKER_IMAGE_TAG=$CIRCLE_TAG
     - run: make docker DOCKER_IMAGE_TAG=$CIRCLE_TAG DOCKER_REPO=quay.io/prometheus
     - run: docker login -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
     - run: docker login -u $QUAY_LOGIN -p $QUAY_PASSWORD quay.io
+    - run: make docker-publish DOCKER_IMAGE_TAG="$CIRCLE_TAG"
+    - run: make docker-publish DOCKER_IMAGE_TAG="$CIRCLE_TAG" DOCKER_REPO=quay.io/prometheus
+    - run: make docker-manifest DOCKER_IMAGE_TAG="$CIRCLE_TAG"
+    - run: make docker-manifest DOCKER_IMAGE_TAG="$CIRCLE_TAG" DOCKER_REPO=quay.io/prometheus
     - run: |
         if [[ "$CIRCLE_TAG" =~ ^v[0-9]+(\.[0-9]+){2}$ ]]; then
           make docker-tag-latest DOCKER_IMAGE_TAG="$CIRCLE_TAG"
           make docker-tag-latest DOCKER_IMAGE_TAG="$CIRCLE_TAG" DOCKER_REPO=quay.io/prometheus
+          make docker-publish DOCKER_IMAGE_TAG="latest"
+          make docker-publish DOCKER_IMAGE_TAG="latest" DOCKER_REPO=quay.io/prometheus
+          make docker-manifest DOCKER_IMAGE_TAG="latest"
+          make docker-manifest DOCKER_IMAGE_TAG="latest" DOCKER_REPO=quay.io/prometheus
         fi
-    - run: make docker-publish
-    - run: make docker-publish DOCKER_REPO=quay.io/prometheus
 
 workflows:
   version: 2

Dockerfile

@@ -1,8 +1,12 @@
-FROM        prom/busybox:latest
+ARG ARCH="amd64"
+ARG OS="linux"
+FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
 LABEL maintainer="The Prometheus Authors <prometheus-developers@googlegroups.com>"
 
-COPY amtool                       /bin/amtool
-COPY alertmanager                 /bin/alertmanager
+ARG ARCH="amd64"
+ARG OS="linux"
+COPY .build/${OS}-${ARCH}/amtool       /bin/amtool
+COPY .build/${OS}-${ARCH}/alertmanager /bin/alertmanager
 COPY examples/ha/alertmanager.yml      /etc/alertmanager/alertmanager.yml
 
 RUN mkdir -p /alertmanager && \

Makefile

@@ -11,6 +11,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Needs to be defined before including Makefile.common to auto-generate targets
+DOCKER_ARCHS ?= amd64 armv7 arm64
+
 include Makefile.common
 
 FRONTEND_DIR             = $(BIN_DIR)/ui/app