Example Java Cluster

example-java-cluster.yaml

# this Apache Brooklyn blueprint will deploy an example Java service cluster

brooklyn.catalog:
  version: 1.1.0-PREVIEW.20150818
  
  items:
  - id: host
    item:
      type: brooklyn.entity.basic.VanillaSoftwareProcess
      name: Host

      # TODO validate this early on
      download.url: $brooklyn:config("app.download.url")

      provisioning.properties:
        osFamily: ubuntu

      launch.command: |
        # install java if necessary, at least java 8
        sudo -E -n -S -- sudo apt-get install oracle-java8-set-default || echo "WARN: could not install Java, may fail subsequently"

        # create the start script
        cat > start.sh << EOF
          . ~/bin/java-use-v8 || echo "Extra script to install Java 8 is not available here"
          nohup java -jar ${JAR_FILE:-*.jar} &
          echo \$! > "$PID_FILE"
          sleep 5
        EOF

        chmod +x start.sh
        # best-effort install to restart on reboot
        sudo -E -n -S -- cp start.sh /etc/rc.local || echo "WARN: could not install to /etc/rc.local, will not restart on machine reboot"

        ./start.sh

      shell.env:
        # TODO this should only apply to launch
        JAR_FILE: $brooklyn:config("jar.filename")
        PEERS: $brooklyn:config("peers.urls")
        SUBNET_ADDRESS: $brooklyn:attributeWhenReady("host.subnet.address")
        APP_PORT: $brooklyn:config("app.port")

      brooklyn.config:
        peers.urls: ""
        app.port: 8000
        jar.filename: ""

      brooklyn.enrichers:
      - type: brooklyn.enricher.basic.Transformer
        brooklyn.config:
          uniqueTag: url-generator
          # TODO if not up or any not available, then set null
          enricher.sourceSensor: $brooklyn:sensor("service.isUp")
          enricher.targetSensor: $brooklyn:sensor("app.url")
          enricher.targetValue: $brooklyn:formatString("http://%s:%s/",
            $brooklyn:attributeWhenReady("host.subnet.hostname"),
            $brooklyn:config("app.port"))
      - type: brooklyn.enricher.basic.Propagator
        brooklyn.config:
          uniqueTag: propagate-main-uri
          sensorMapping:
            $brooklyn:sensor("app.url"): $brooklyn:sensor("brooklyn.entity.basic.Attributes", "main.uri")
      - type: brooklyn.enricher.basic.Propagator
        brooklyn.config:
          uniqueTag: propagate-datastore-url
          sensorMapping:
            $brooklyn:sensor("app.url"): $brooklyn:sensor("org.apache.brooklyn.entity.database.DatastoreMixins", "datastore.url")

  - id: app-cluster
    item:
      type: brooklyn.entity.group.DynamicCluster
      name: Cluster
      id: app-cluster
      firstMemberSpec:
        $brooklyn:entitySpec:
          type: host
          name: First Host
      memberSpec:
        $brooklyn:entitySpec:
          type: host
          brooklyn.config:
            peers.urls: $brooklyn:entity("app-cluster").attributeWhenReady("app.peers.urls.comma_separated.max_3")
      brooklyn.enrichers:
      - type: brooklyn.enricher.basic.Aggregator
        brooklyn.config:
          uniqueTag: url-aggregator
          enricher.aggregator.excludeBlank: true
          enricher.aggregating.fromMembers: true
          enricher.sourceSensor: $brooklyn:sensor("app.url")
          enricher.targetSensor: $brooklyn:sensor("app.peers.urls.list")
      - type: brooklyn.enricher.basic.Joiner
        brooklyn.config:
          uniqueTag: url-joiner
          enricher.sourceSensor: $brooklyn:sensor("app.peers.urls.list")
          enricher.targetSensor: $brooklyn:sensor("app.peers.urls.comma_separated.max_3")
          separator: ","
          maximum: 3
      - type: brooklyn.enricher.basic.Joiner
        brooklyn.config:
          uniqueTag: url-main
          enricher.sourceSensor: $brooklyn:sensor("app.peers.urls.list")
          enricher.targetSensor: $brooklyn:sensor("brooklyn.entity.basic.Attributes", "main.uri")
          quote: false
          maximum: 1

  - id: app-cluster-example
    itemType: template
    item:
      name: My App Cluster
      services:
      - type: app-cluster
        location:
          jclouds:softlayer:
            region: sjc01
            # identity and credential must be set unless they are specified in your brooklyn.properties
            # identity: XXX
            # credential: XXX
        brooklyn.config:
          cluster.initial.size: 3
          app.download.url: http://hostname:port/path/to/target/with-dependencies.jar