Add UBI image and modify CI for this image

Author: chaitanyaphalak

.circleci/build_and_push_to_dockerhub.sh

@@ -3,6 +3,9 @@ set -e
 FLUENTD_HEC_GEM_VERSION=`cat docker/FLUENTD_HEC_GEM_VERSION`
 echo "Building docker image..."
 cp /tmp/pkg/fluent-plugin-kubernetes-metrics-*.gem docker
+echo "Copying licenses to be included in the docker image..."
+mkdir licenses
+cp -rp LICENSE licenses/
 VERSION=`cat VERSION`
 docker build --build-arg VERSION=$FLUENTD_HEC_GEM_VERSION --no-cache -t splunk/fluent-plugin-kubernetes-metrics:ci ./docker
 docker tag splunk/fluent-plugin-kubernetes-metrics:ci splunk/${DOCKERHUB_REPO_NAME}:${VERSION}

docker/Dockerfile

@@ -1,52 +1,38 @@
-FROM alpine:3.8
+FROM registry.access.redhat.com/ubi8/ruby-25
 
-LABEL maintainer="Splunk Inc. <[email protected]>"
-LABEL Description="Splunk Connect for Kubernetes docker image" Vendor="Splunk Inc."
+MAINTAINER DataEdge [email protected]
+
+LABEL name="Splunk Connect for Kubernetes Metrics container" \
+      maintainer="[email protected]" \
+      vendor="Splunk Inc." \
+      version="1.1.3" \
+      release="1.1.3" \
+      summary="Splunk Connect for Kubernetes Metrics container" \
+      description="Splunk Connect for Kubernetes Metrics container"
 
 ARG VERSION
 ENV VERSION=${VERSION}
+ENV FLUENT_USER fluent
 
-ENV DUMB_INIT_VERSION=1.2.1
-ENV SU_EXEC_VERSION=0.2
+USER root
 
 COPY *.gem /tmp/
-
-ARG DEBIAN_FRONTEND=noninteractive
-# Do not split this into multiple RUN!
-# Docker creates a layer for every RUN-Statement
-# therefore an 'apk delete' has no effect
-RUN apk update \
- && apk upgrade \
- && apk add --no-cache \
-        ca-certificates \
- && update-ca-certificates \
- && apk add --no-cache \
-        ruby ruby-irb ruby-etc ruby-webrick ruby-json \
-        su-exec==${SU_EXEC_VERSION}-r0 \
-        dumb-init==${DUMB_INIT_VERSION}-r0 \
- && apk add --no-cache --virtual .build-deps \
-        build-base \
-        ruby-dev wget gnupg \
- && echo 'gem: --no-document' >> /etc/gemrc \
- && gem install -N \
-         fluentd:1.4.0 \
-         fluent-plugin-record-modifier:2.0.1 \
-         fluent-plugin-splunk-hec:${VERSION} \
-         oj:3.7.9 \
-         multi_json:1.13.1 \
-         bigdecimal:1.4.3 \
-         kubeclient:4.3.0 \
- && gem install -N /tmp/*.gem \
- && apk del .build-deps \
- && rm -rf /var/cache/apk/* \
- && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem
-
-ENV LD_PRELOAD="" \
-    FLUENTD_CONF="fluent.conf" \
-    FLUENTD_OPT="" \
-    DUMB_INIT_SETSID=0
-
-COPY entrypoint.sh /bin/entrypoint.sh
-ENTRYPOINT ["/bin/entrypoint.sh"]
-
-CMD exec fluentd -c /fluentd/etc/${FLUENTD_CONF} -p /fluentd/plugins $FLUENTD_OPT
+COPY licenses /licenses
+
+RUN gem install -N fluentd:1.4.0 \
+       fluent-plugin-prometheus:1.3.0 \
+       fluent-plugin-record-modifier:2.0.1 \
+       fluent-plugin-splunk-hec:${VERSION} \
+       oj:3.7.9 \
+       multi_json:1.13.1 \
+       bigdecimal:1.4.3 \
+       kubeclient:4.3.0 && \
+    gem install -N /tmp/*.gem
+
+RUN groupadd -r $FLUENT_USER && \
+  useradd -r -g $FLUENT_USER $FLUENT_USER && \
+  mkdir -p /fluentd/log fluentd/etc /fluentd/plugins &&\
+  chown -R $FLUENT_USER /fluentd && chgrp -R $FLUENT_USER /fluentd
+
+USER $FLUENT_USER
+CMD exec fluentd -c /fluentd/etc/fluent.conf