pkg/cadvisor

Signed-off-by: Marco Mariani <marco.mariani@alterway.fr>

pkg/cadvisor/Dockerfile

@@ -0,0 +1,40 @@
+FROM linuxkit/alpine:07f7d136e427dc68154cd5edbb2b9576f9ac5213 as build
+
+RUN apk add --no-cache bash go git musl-dev linux-headers make
+
+ENV GOPATH=/go PATH=$PATH:/go/bin
+ENV GITREPO=github.com/google/cadvisor
+ENV COMMIT=v0.28.1
+
+ADD /static.patch /tmp/
+
+RUN go get -d ${GITREPO} \
+    && cd /go/src/${GITREPO} \
+    && git checkout ${COMMIT} \
+    && patch -p1 build/build.sh </tmp/static.patch \
+    && make build \
+    && mv cadvisor /usr/bin/
+
+
+FROM linuxkit/alpine:07f7d136e427dc68154cd5edbb2b9576f9ac5213 AS mirror
+
+RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
+RUN apk add --no-cache --initdb -p /out \
+    alpine-baselayout \
+    busybox \
+    curl
+
+# Remove apk residuals
+RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache
+
+
+FROM scratch
+ENTRYPOINT []
+CMD []
+WORKDIR /
+COPY --from=mirror /out/ /
+COPY --from=build /usr/bin/cadvisor /usr/bin/cadvisor
+COPY /waitfordocker.sh /usr/bin/waitfordocker.sh
+
+ENTRYPOINT ["/usr/bin/waitfordocker.sh", "/usr/bin/cadvisor", "-logtostderr", "--disable_metrics=disk,tcp,udp"]
+LABEL org.mobyproject.config='{"pid": "host", "binds": ["/var/lib/docker:/var/lib/docker:ro", "/var/run:/var/run", "/sys:/sys:ro", "/etc/resolv.conf:/etc/resolv.conf:ro"], "capabilities": ["all"]}'

pkg/cadvisor/build.yml

@@ -0,0 +1,2 @@
+image: cadvisor
+network: true

pkg/cadvisor/static.patch

@@ -0,0 +1,10 @@
+--- build/build.sh.orig	2017-11-16 16:29:18.281342577 +0000
++++ build/build.sh	2017-11-16 16:29:55.534787421 +0000
+@@ -44,6 +44,7 @@
+   -X ${repo_path}/version.BuildDate${ldseparator}${BUILD_DATE}
+   -X ${repo_path}/version.GoVersion${ldseparator}${go_version}"
+ 
++ldflags="$ldflags -extldflags \"-static\""
+ echo ">> building cadvisor"
+ 
+ if [ -n "$VERBOSE" ]; then

pkg/cadvisor/waitfordocker.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+# copied from projects/compose, with fixes for shellcheck
+# shellcheck disable=SC2039
+set -e
+
+#########
+#
+# wait for docker socket to be ready, then run the rest of the command
+#
+########
+RETRIES=${RETRIES:-"-1"}
+WAIT=${WAIT:=10}
+[ -n "$DEBUG" ] && set -x
+
+# keep retrying until docker is ready or we hit our limit
+retry_or_fail() {
+  local retry_count=0
+  local success=1
+  local cmd=$1
+  local retryMax=$2
+  local retrySleep=$3
+  local message=$4
+  until [ "$retry_count" -ge "$retryMax" ] && [ "$retryMax" -ne -1 ]; do
+    echo "trying to $message"
+    set +e
+    $cmd
+    success=$?
+    set -e
+    [ $success -eq 0 ] && break
+    retry_count=$(( retry_count+1 )) || true
+    echo "attempt number $retry_count failed to $message, sleeping $retrySleep seconds..."
+    sleep "$retrySleep"
+  done
+  # did we succeed?
+  if [ $success -ne 0 ]; then
+    echo "failed to $message after $retryMax tries. Exiting..." >&2
+    exit 1
+  fi
+}
+
+connect_to_docker() {
+  [ -S /var/run/docker.sock ] || return 1
+  curl --unix-socket /var/run/docker.sock http://localhost/containers/json >/dev/null 2>&1 || return 1
+}
+# try to connect to docker
+retry_or_fail connect_to_docker "$RETRIES" "$WAIT" "connect to docker"
+
+# if we got here, we succeeded
+exec "$@"