Drop run.sh and use distroless as base image for CA

cluster-autoscaler/Dockerfile

@@ -11,15 +11,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-ARG BASEIMAGE=k8s.gcr.io/debian-base-amd64:v1.0.0
+ARG BASEIMAGE=gcr.io/distroless/static:latest
 FROM $BASEIMAGE
 LABEL maintainer="Marcin Wielgus <mwielgus@google.com>"
 
-ENV DEBIAN_FRONTEND noninteractive
-RUN clean-install ca-certificates tzdata
-
-ADD cluster-autoscaler cluster-autoscaler
-ADD run.sh run.sh
-
-CMD ./run.sh
+COPY cluster-autoscaler /
+CMD ["/cluster-autoscaler"]

cluster-autoscaler/run.sh

@@ -1,33 +0,0 @@
-#!/bin/sh
-
-# Copyright 2017 The Kubernetes Authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# A wrapper script trapping SIGTERM (docker stop) and passing the signal to
-# cluster-autoscaler binary.
-
-if [ -z "$LOG_OUTPUT" ]; then
-  LOG_OUTPUT="/var/log/cluster_autoscaler.log"
-fi
-
-./cluster-autoscaler $@ 1>>$LOG_OUTPUT 2>&1 &
-pid="$!"
-trap "kill -15 $pid" 15
-
-# We need a loop here, because receiving signal breaks out of wait.
-# kill -0 doesn't send any signal, but it still checks if the process is running.
-while kill -0 $pid > /dev/null 2>&1; do
-  wait $pid
-done
-exit "$?"