make logging configurable via helm (#46)

helm/templates/log-configmap.yaml

@@ -0,0 +1,22 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "schema-registry.fullname" . }}-log-configmap
+  labels:
+    {{- include "schema-registry.labels.standard" . | nindent 4 }}
+data:
+  log4j.properties: |-
+    log4j.rootLogger={{ .Values.logging.level }}, stdout
+
+    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+    log4j.appender.stdout.layout.ConversionPattern=[%d] [%p] [%t] [%c] - %m%n
+
+    log4j.logger.kafka=ERROR, stdout
+    log4j.additivity.kafka=false
+    {{- if .Values.logging.extraLogConfig }}
+    {{- range $key,$value := .Values.logging.extraLogConfig }}
+    log4j.logger.{{ $value.name }}={{ $value.level }}, stdout
+    log4j.additivity.{{ $value.name }}=false
+    {{- end }}
+    {{- end }}

helm/templates/statefulset.yaml

@@ -44,6 +44,10 @@ spec:
             {{- toYaml .Values.readinessProbe | nindent 12 }}
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
+          volumeMounts:
+            - name: log-config
+              mountPath: /opt/schema-registry/etc/schema-registry/log4j.properties
+              subPath: "log4j.properties"
           env:
             - name: SCHEMA_REGISTRY_HOST_NAME
               valueFrom:
@@ -107,6 +111,9 @@ spec:
       terminationGracePeriodSeconds: {{ .Values.terminationGracePeriodSeconds }}
       {{- if .Values.prometheus.jmx.enabled }}
       volumes:
+        - name: log-config
+          configMap:
+            name: {{ template "schema-registry.fullname" . }}-log-configmap
         - name: jmx-config
           configMap:
             name: {{ template "schema-registry.fullname" . }}-jmx-configmap

helm/values.yaml

@@ -145,3 +145,13 @@ servicemonitor:
   interval: 15s
   secure: false
   tlsConfig: {}
+
+logging:
+  level: WARN
+  extraLogConfig:
+    kafka:
+      name: org.apache.kafka
+      level: ERROR
+    zookeeper:
+      name: org.apache.zookeeper
+      level: ERROR