Add confd support

Author: mixja

Dockerfile

@@ -3,10 +3,11 @@ MAINTAINER Justin Menga <[email protected]>
 LABEL application=microtrader
 
 # Install system dependencies
-RUN apk add --update --no-cache bash curl
+RUN echo "@testing http://nl.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories && \
+    apk add --update --no-cache bash curl confd@testing
 
 # Create vertx user
-RUN mkdir /app && \
+RUN mkdir -p /app/conf && \
     addgroup -g 1000 vertx && \
     adduser -u 1000 -G vertx -D vertx && \
     chown -R vertx:vertx /app
@@ -15,8 +16,10 @@ RUN mkdir /app && \
 USER vertx
 WORKDIR /app
 
+# Copy common confd templates
+COPY etc/confd /etc/confd
+
 # Set entrypoint and default command arguments
-COPY cluster.xml /app/conf/cluster.xml
 COPY entrypoint.sh /app/entrypoint.sh
 ENTRYPOINT ["/app/entrypoint.sh"]
 CMD ["java", "-jar", "/app/app.jar", "-server", "-cluster", "-Dvertx.hazelcast.config=/app/conf/cluster.xml"]

entrypoint.sh

@@ -2,6 +2,7 @@
 set -e
 
 # Add initialisation logic here
+confd -onetime -backend env
 
 # Run application
 exec "$@"

etc/confd/conf.d/cluster.xml.toml

@@ -0,0 +1,12 @@
+[template]
+src  = "cluster.xml.tmpl"
+dest = "/app/conf/cluster.xml"
+keys = [
+  "/cluster/group/name",
+  "/cluster/group/password",
+  "/cluster/aws/enabled",
+  "/cluster/aws/region",
+  "/cluster/aws/iam/role",
+  "/cluster/aws/tag/key",
+  "/cluster/aws/tag/value",
+]

cluster.xml etc/confd/templates/cluster.xml.tmplcluster.xml renamed to etc/confd/templates/cluster.xml.tmpl

@@ -11,13 +11,13 @@
   </properties>
 
   <group>
-    <name>microtrader</name>
-    <password>password</password>
+    <name>{{getv "/cluster/group/name" "microtrader"}}</name>
+    <password>{{getv "/cluster/group/password" "password"}}</password>
   </group>
 
   <management-center enabled="false">http://localhost:8080/mancenter</management-center>
   <network>
-    <port auto-increment="true" port-count="10">5701</port>
+    <port auto-increment="true" port-count="10000">5701</port>
     <outbound-ports>
       <!--
       Allowed port range when connecting to other nodes.
@@ -26,10 +26,21 @@
       <ports>0</ports>
     </outbound-ports>
     <join>
+      {{- if eq (toLower (getv "/cluster/aws/enabled" "false")) "true" }}
+      <multicast enabled="false"/>
+      <tcp-ip enabled="false"/>
+      <aws enabled="true">
+        <region>{{getv "/cluster/aws/region" "us-west-2"}}</region>
+        <iam-role>{{getv "/cluster/aws/iam/role" "DEFAULT"}}</iam-role>
+        <tag-key>{{getv "/cluster/aws/tag/key" "hazelcast:group"}}</tag-key>
+        <tag-value>{{getv "/cluster/aws/tag/value" "microtrader"}}</tag-value>
+      </aws>
+      {{- else }}
       <multicast enabled="true"/>
       <tcp-ip enabled="false">
           <interface>127.0.0.1</interface>
       </tcp-ip>
+      {{- end }}
     </join>
     <interfaces enabled="false">
       <interface>10.10.1.*</interface>