Added a nulecule for Apache Cassandra

cassandra-atomicapp/Dockerfile

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+FROM projectatomic/atomicapp:0.4.4
+
+MAINTAINER Varun Joshi <varunj.1011@gmail.com>
+
+LABEL io.projectatomic.nulecule.providers="docker,kubernetes" \
+      io.projectatomic.nuleclue.specversion="0.0.2"
+
+ADD /Nulecule /Dockerfile /application-entity/
+ADD /artifacts /application-entity/artifacts

cassandra-atomicapp/Nulecule

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+---
+specversion: 0.0.2
+id: cassandra-atomicapp
+
+metadata:
+  name: Cassandra App
+  appversion: 0.0.1
+  description: Cassandra Atomic App
+
+graph:
+  - name: cassandra-app
+    params:
+      - name: image
+        description: The cassandra image
+      - name: hostport
+        description: The port where cassandra runs
+        default: 7000
+      - name: listen_address
+        description: This variable is for controlling which IP address to listen for incoming connections on.
+        default: auto
+      - name: broadcast_address
+        description: This variable is for controlling which IP address to advertise to other nodes.
+        default: auto
+      - name: rpc_address
+        description: This variable is for controlling which address to bind the thrift rpc server to.
+        default: 0.0.0.0
+      - name: start_rpc
+        description: This variable is for controlling if the thrift rpc server is started.
+        default: ""
+      - name: seeds
+        description: This variable is the comma-separated list of IP addresses used by gossip for bootstrapping new nodes joining a cluster.
+        default: ""
+      - name: cluster_name
+        description: This variable sets the name of the cluster and must be the same for all nodes in the cluster.
+        default: ""
+      - name: num_tokens
+        description: This variable sets number of tokens for this node.
+        default: ""
+      - name: dc
+        description: This variable sets the datacenter name of this node.
+        default: ""
+      - name: rack
+        description: This variable sets the rack name of this node.
+        default: ""
+      - name: endpoint_snitch
+        description: This variable sets the snitch implementation this node will use.
+        default: ""
+    artifacts:
+      docker:
+        - file://artifacts/docker/cassandra_run
+      kubernetes:
+        - file://artifacts/kubernetes/cassandra-rc.yaml
+        - file://artifacts/kubernetes/cassandra-svc.yaml

cassandra-atomicapp/answers.conf.sample

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+[cassandra-app]
+num_tokens = None
+endpoint_snitch = ""
+broadcast_address = auto
+start_rpc = ""
+image = ""
+hostport = 7000
+dc = ""
+cluster_name = ""
+seeds = ""
+rpc_address = 0.0.0.0
+listen_address = auto
+rack = ""
+[general]
+namespace = default
+provider = docker

cassandra-atomicapp/artifacts/docker/cassandra_run

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+docker run -d -p 7000:$hostport
+    -e CASSANDRA_LISTEN_ADDRESS=$listen_address
+    -e CASSANDRA_BROADCAST_ADDRESS=$broadcast_address
+    -e CASSANDRA_RPC_ADDRESS=$rpc_address
+    -e CASSANDRA_START_RPC=$start_rpc
+    -e CASSANDRA_SEEDS=$seeds
+    -e CASSANDRA_CLUSTER_NAME=$cluster_name
+    -e CASSANDRA_NUM_TOKENS=$num_tokens
+    -e CASSANDRA_DC=$dc
+    -e CASSANDRA_RACK=$rack
+    -e CASSANDRA_ENDPOINT_SNITCH=$endpoint_snitch
+    $image

cassandra-atomicapp/artifacts/kubernetes/cassandra-rc.yaml

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+---
+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: cassandra
+  labels:
+    name: cassandra
+spec:
+  replicas: 1
+  selector:
+    name: cassandra
+  template:
+    metadata:
+      labels:
+        name: cassandra
+    spec:
+      containers:
+        - name: cassandra
+          image: $image
+          ports:
+            - name: cassandra-server
+              containerPort: $hostport
+          env:
+            - name: CASSANDRA_LISTEN_ADDRESS
+              value: $listen_address
+            - name: CASSANDRA_BROADCAST_ADDRESS
+              value: $broadcast_address
+            - name: CASSANDRA_RPC_ADDRESS
+              value: $rpc_address
+            - name: CASSANDRA_START_RPC
+              value: $start_rpc
+            - name: CASSANDRA_SEEDS
+              value: $seeds
+            - name: CASSANDRA_CLUSTER_NAME
+              value: $cluster_name
+            - name: CASSANDRA_NUM_TOKENS
+              value: $num_tokens
+            - name: CASSANDRA_DC
+              value: $dc
+            - name: CASSANDRA_RACK
+              value: $rack
+            - name: CASSANDRA_ENDPOINT_SNITCH
+              value: $endpoint_snitch

cassandra-atomicapp/artifacts/kubernetes/cassandra-svc.yaml

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+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: cassandra-svc
+  labels:
+    name: cassandra-svc
+spec:
+  type: NodePort
+  ports:
+    - port: 7000
+      targetPort: cassandra-server
+  selector:
+    name: cassandra