Updated to use Ruby 2.2 on rhel7.4 and added HPA

Dockerfile

@@ -1,9 +1,13 @@
-# start based on a centos image
-FROM rhel7
+# start based on a rhel image using a specific minor version.
+FROM rhel7.4
 
 ENV HOME=/opt/app-root/src \
-  PATH=/opt/app-root/src/bin:/opt/app-root/bin:$PATH \
-  RUBY_VERSION=2.0 \
+  PATH=/opt/rh/rh-ruby22/root/usr/bin:/opt/app-root/src/bin:/opt/app-root/bin${PATH:+:${PATH}} \
+  LD_LIBRARY_PATH=/opt/rh/rh-ruby22/root/usr/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}} \
+  MANPATH=/opt/rh/rh-ruby22/root/usr/share/man:$MANPATH \
+  PKG_CONFIG_PATH=/opt/rh/rh-ruby22/root/usr/lib64/pkgconfig${PKG_CONFIG_PATH:+:${PKG_CONFIG_PATH}} \
+  XDG_DATA_DIRS=/opt/rh/rh-ruby22/root/usr/share${XDG_DATA_DIRS:+:${XDG_DATA_DIRS}} \
+  RUBY_VERSION=2.2 \
   FLUENTD_VERSION=0.12.32 \
   GEM_HOME=/opt/app-root/src \
   DATA_VERSION=1.6.0 \
@@ -31,8 +35,9 @@ LABEL io.k8s.description="Fluentd container for collecting logs from other fluen
 # bc for calculations in run.conf
 RUN yum install -y --disablerepo=\* --enablerepo=rhel-7-server-rpms --enablerepo=rhel-server-rhscl-7-rpms --enablerepo=rhel-7-server-optional-rpms --setopt=tsflags=nodocs \
       gcc-c++ \
-      ruby \
-      ruby-devel \
+      rh-ruby22 \
+      rh-ruby22-rubygems \
+      rh-ruby22-ruby-devel \
       libcurl-devel \
       make \
       bc \

fluentd-forwarder-template.yaml

@@ -145,6 +145,20 @@ objects:
         port ${TARGET_PORT}
         ${ADDITIONAL_OPTS}
       </match>
+- apiVersion: extensions/v1beta1
+  kind: HorizontalPodAutoscaler
+  metadata:
+    name: fluentd-forwarder
+  spec:
+    scaleRef:
+      kind: DeploymentConfig
+      name: fluentd-forwarder
+      apiVersion: v1
+      subresource: scale
+    minReplicas: 1
+    maxReplicas: ${P_AUTOSCALE_MAX_PODS}
+    CPUUtilization:
+      targetPercentage: ${P_AUTOSCALE_TARGET_CPU}
 parameters:
   - name: P_NAMESPACE
     description: Target namespace for image. Used to reference the ImageStream source for the image.
@@ -182,3 +196,9 @@ parameters:
   - name: P_KEY_PATH
     description: Path to the key that should be used for the server PKI. Defaults the the path outlined for secret mount.
     value: /secrets/tls.key
+  - name: P_AUTOSCALE_MAX_PODS
+    description: Maximum number of pods that fluentd-forwarder should scale up to.
+    value: "4"
+  - name: P_AUTOSCALE_TARGET_CPU
+    description: Target CPU Utilization for the HPA.
+    value: "80"