CloudFormation Template to Create a 3 Node Cassandra Cluster

cf_build_cassandra.yaml

AWSTemplateFormatVersion: '2010-09-09'

Metadata:
  License: Apache-2.0

Parameters:
  ClusterTargetVPC:
    Description: "The name of the VPC to host the cluster."
    Type: "String"
  ClusterSubnetCIDRRange:
    Description: "The address range in the VPC for the cluster"s subnet."
    Type: "String"
    MinLength: "9"
    MaxLength: "18"
    AllowedPattern: (\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})
    ConstraintDescription: Must be a valid CIDR range of the form x.x.x.x/x.
  ClusterNodeType:
    Description: "The EC2 instance type of the cluster"s nodes. The instance type dictates the hard provisioned for the nodes in the cluster."
    Type: "String"
    Default: "t2.micro"
    AllowedValues:
      - "t2.nano"
      - "t2.micro"
    ConstraintDescription: "This must be a valid AWS EC2 instance type."
  ClusterNodeAMI:
    Description: "The AMI identifier of the cluster nodes". The AMI dictates the OS deployed to the node."
    Type: "AWS::EC2::Image::Id"
  ClusterSecurityGroupDescription:
    Description: "A description associated with the cluster"s security group."
    Type: "String"
    Default: "Security group granting clients access to the cluster."
  ClusterSecurityGroupPort:
    Description: "The port number Cassandra is configured to accept incoming connections on."
    Type: "Number"
    Default: 9042
    MinValue: 1150
    MaxValue: 65535
  CloseNodeAccessKeyName:
    Description: "The name of an existing EC2 key pair for use accessing the cluster nodes."
    Type: "String"
  ClusterIngressCIDRRange:
    Description: "The address range that can be used to communicate with the cluster."
    Type: "String"
    MinLength: "9"
    MaxLength: "18"
    Default: "0.0.0.0/0"
    AllowedPattern: (\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})
    ConstraintDescription: Must be a valid CIDR range of the form x.x.x.x/x.

Resources:
  ClusterSubnet:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId: !Ref "ClusterTargetVPC"
      CidrBlock: !Select [0, !Ref ClusterSubnetCIDRRange]
  ClusterNode1:
    Type: "AWS::EC2::Instance"
    Properties:
      InstanceType: !Ref "ClusterNodeType"
      ImageId:  !Ref "ClusterNodeAMI"
      KeyName: !Ref "CloseNodeAccessKeyName"
      SubnetId: !Ref "ClusterSubnet"
      InstanceInitiatedShutdownBehavior: "stop"
      SecurityGroups:
        - !Ref "ClusterSecurityGroup"
      NetworkInterfaces:
        - AssociatePublicIpAddress: "true"
          DeviceIndex: "0"
          GroupSet: 
            - Ref: "myVPCEC2SecurityGroup"
          SubnetId: 
            Ref: "PublicSubnet"
      UserData:
        Fn::Base64: |
          #!/bin/bash
          yum update -y
          # Install Java
          yum -y install java
          echo "export JAVA_HOME=$(whereis java | awk '{print $2}')" >> .bash_profile
          # Install Cassandra
          echo "[cassandra]" | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "name=Apache Cassandra"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "baseurl=https://downloads.apache.org/cassandra/redhat/40x/"   | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "gpgcheck=1"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "repo_gpgcheck=1"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "gpgkey=https://downloads.apache.org/cassandra/KEYS"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          yum update
          yum install cassandra
          # Start Cassandra
          service cassandra start
  ClusterNode2:
    Type: "AWS::EC2::Instance"
    Properties:
      InstanceType: !Ref "ClusterNodeType"
      ImageId:  !Ref "ClusterNodeAMI"
      KeyName: !Ref "CloseNodeAccessKeyName"
      SubnetId: !Ref "ClusterSubnet"
      InstanceInitiatedShutdownBehavior: "stop"
      SecurityGroups:
        - !Ref "ClusterSecurityGroup"
      UserData:
        Fn::Base64: |
          #!/bin/bash
          yum update -y
          # Install Java
          yum -y install java
          echo "export JAVA_HOME=$(whereis java | awk '{print $2}')" >> .bash_profile
          # Install Cassandra
          echo "[cassandra]" | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "name=Apache Cassandra"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "baseurl=https://downloads.apache.org/cassandra/redhat/40x/"   | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "gpgcheck=1"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "repo_gpgcheck=1"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "gpgkey=https://downloads.apache.org/cassandra/KEYS"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          yum update
          yum install cassandra
          # Start Cassandra
          service cassandra start
  ClusterNode3:
    Type: "AWS::EC2::Instance"
    Properties:
      InstanceType: !Ref "ClusterNodeType"
      ImageId:  !Ref "ClusterNodeAMI"
      KeyName: !Ref "CloseNodeAccessKeyName"
      SubnetId: !Ref "ClusterSubnet"
      InstanceInitiatedShutdownBehavior: "stop"
      SecurityGroups:
        - !Ref "ClusterSecurityGroup"
      UserData:
        Fn::Base64: |
          #!/bin/bash
          yum update -y
          # Install Java
          yum -y install java
          echo "export JAVA_HOME=$(whereis java | awk '{print $2}')" >> .bash_profile
          # Install Cassandra
          echo "[cassandra]" | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "name=Apache Cassandra"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "baseurl=https://downloads.apache.org/cassandra/redhat/40x/"   | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "gpgcheck=1"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "repo_gpgcheck=1"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          echo "gpgkey=https://downloads.apache.org/cassandra/KEYS"  | sudo tee -a /etc/yum.repos.d/cassandra.repo >> /dev/null
          yum update
          yum install cassandra
          # Start Cassandra
          service cassandra start
  ClusterSecurityGroup:
    Type: "AWS::EC2::SecurityGroup"
    Properties:
      GroupDescription: !Ref "ClusterSecurityGroupDescription"
      SecurityGroupIngress:
        - CidrIp: !Ref "ClusterIngressCIDRRange"
          FromPort: !Ref "ClusterSecurityGroupPort"
          ToPort: !Ref "ClusterSecurityGroupPort"
          IpProtocol: "tcp"

Outputs:
  Node1Identifier:
    Description: "The identifier for node 1."
    Value: !Ref "ClusterNode1"
  Node1DNS:
    Description: "The public domain name for node 1."
    Value: !GetAtt [ClusterNode1, PublicDnsName]
  Node1IP:
    Description: "The public IP address for node 1."
    Value: !GetAtt [ClusterNode1, PublicIp]
  Node2Identifier:
    Description: "The identifier for node 2."
    Value: !Ref "ClusterNode1"
  Node2DNS:
    Description: "The public domain name for node 2."
    Value: !GetAtt [ClusterNode2, PublicDnsName]
  Node2IP:
    Description: "The public IP address for node 2."
    Value: !GetAtt [ClusterNode2, PublicIp]
  Node3Identifier:
    Description: "The identifier for node 3."
    Value: !Ref "ClusterNode3"
  Node3DNS:
    Description: "The public domain name for node 3."
    Value: !GetAtt [ClusterNode3, PublicDnsName]
  Node3IP:
    Description: "The public IP address for node 3."
    Value: !GetAtt [ClusterNode3, PublicIp]