Added a custom entrypoint to set the max-old-size as this is a low memory nodejs environment

Author: Stono

Dockerfile

@@ -10,6 +10,9 @@ RUN ./node_modules/.bin/grunt test
 RUN ./node_modules/.bin/grunt build
 
 FROM mhart/alpine-node:${NODEJS_VERSION} as deploy
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+ENTRYPOINT [ "/usr/local/bin/entrypoint.sh" ]
+
 WORKDIR /app
 RUN addgroup nonroot && \
     adduser -D nonroot -G nonroot && \

docker-compose.yml

@@ -6,7 +6,7 @@ services:
       context: '.'
       args:
         NODEJS_VERSION: 14.4.0
-    command: 'node lib/apps/controller/index.js'
+    command: 'controller'
     environment:
       PORT: '80' # Run on port 80 locally in docker-compose to replicate kubernetes service object port magenting
     hostname: 'controller'
@@ -25,7 +25,7 @@ services:
 
   agent:
     image: stono/kconmon:${VERSION:-latest}
-    command: 'node lib/apps/agent/index.js'
+    command: 'agent'
     environment:
       PORT: '80' # Run on port 80 locally in docker-compose to replicate kubernetes service object port magenting
     hostname: 'agent'

entrypoint.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e
+
+if [ ! -z "$CONTAINER_RESOURCE_REQUEST_MEMORY" ]; then
+  export MAX_OLD_SPACE=$(/usr/bin/original_node -pe 'Math.round(process.env.CONTAINER_RESOURCE_REQUEST_MEMORY / 1024 / 1024 / 100 * 75)')
+  ADDITIONAL_ARGS="--max_old_space_size=$MAX_OLD_SPACE"
+fi
+
+if [ "$1" = "agent" ]; then
+  TARGET_APP="/app/lib/apps/agent/index.js"
+elif [ "$1" = "controller" ]; then
+  TARGET_APP="/app/lib/apps/controller/index.js"
+else
+  echo "Unknown command: $1"
+  exit 1
+fi
+
+# Pass through to the original node script
+exec /usr/bin/node $ADDITIONAL_ARGS $TARGET_APP

helmfile/charts/kconmon/templates/agent/daemonset.yaml

@@ -74,8 +74,8 @@ spec:
         image: "{{ required "Please specify the docker image" .Values.docker.image }}:{{ .Values.docker.tag | default .Chart.Version }}"
         imagePullPolicy: IfNotPresent
         args:
-        - node
-        - lib/apps/agent/index.js
+        - /usr/local/bin/entrypoint.sh
+        - agent
         env:
         - name: CONTAINER_RESOURCE_REQUEST_MEMORY
           valueFrom:

helmfile/charts/kconmon/templates/controller/deployment.yaml

@@ -39,8 +39,8 @@ spec:
         image: "{{ required "Please specify the docker image" .Values.docker.image }}:{{ .Values.docker.tag | default .Chart.Version }}"
         imagePullPolicy: IfNotPresent
         args:
-        - node
-        - lib/apps/controller/index.js
+        - /usr/local/bin/entrypoint.sh
+        - controller
         env:
         - name: CONTAINER_RESOURCE_REQUEST_MEMORY
           valueFrom: