CloudFormation to demo etcd-aws-cluster

gistfile1.json

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "An etcd cluster based off an auto scaling group",
  "Mappings" : {
      "RegionMap" : {
          "eu-central-1" : {
              "AMI" : "ami-840a0899"
          },
          "ap-northeast-1" : {
              "AMI" : "ami-6c5ac56c"
          },
          "us-gov-west-1" : {
          	  "AMI" : "ami-796a085a"
          },
          "sa-east-1" : {
              "AMI" : "ami-3396012e"
          },
          "ap-southeast-2" : {
              "AMI" : "ami-f5ace5cf"
          },
          "ap-southeast-1" : {
              "AMI" : "ami-46819614"
          },
          "us-east-1" : {
              "AMI" : "ami-05783d60"
          },
          "us-west-2" : {
              "AMI" : "ami-ed8b90dd"
          },
          "us-west-1" : {
              "AMI" : "ami-2b29ee6f"
          },
          "eu-west-1" : {
              "AMI" : "ami-eb97bc9c"
          }
      }
  },
  "Parameters": {
    "InstanceType" : {
      "Description" : "EC2 HVM instance type (m3.medium, etc).",
      "Type" : "String",
      "Default" : "t2.micro",
      "ConstraintDescription" : "Must be a valid EC2 HVM instance type."
    },
    "ClusterSize": {
      "Default": "3",
      "MinValue": "3",
      "MaxValue": "9",
      "Description": "Number of nodes in cluster (3-9).",
      "Type": "Number"
    },
    "ProxyClusterSize": {
      "Default": "1",
      "MinValue": "0",
      "MaxValue": "9",
      "Description": "Number of nodes in cluster (0-9).",
      "Type": "Number"
    },
    "AdvertisedIPAddress": {
      "Description": "Use 'private' if your etcd cluster is within one region or 'public' if it spans regions or cloud providers.",
      "Default": "private",
      "AllowedValues": ["private", "public"],
      "Type": "String"
    },
    "AllowSSHFrom": {
      "Description": "The net block (CIDR) that SSH is available to.",
      "Default": "0.0.0.0/0",
      "Type": "String"
    },
    "KeyPair" : {
      "Description" : "The name of an EC2 Key Pair to allow SSH access to the instance.",
      "Type" : "String"
    }
  },
  "Resources": {
    "CoreOSSecurityGroup": {
      "Type": "AWS::EC2::SecurityGroup",
      "Properties": {
        "GroupDescription": "CoreOS SecurityGroup",
        "SecurityGroupIngress": [
          {"IpProtocol": "tcp", "FromPort": "22", "ToPort": "22", "CidrIp": {"Ref": "AllowSSHFrom"}}
        ]
      }
    },
    "Ingress2379": {
      "Type": "AWS::EC2::SecurityGroupIngress",
      "Properties": {
        "GroupName": {"Ref": "CoreOSSecurityGroup"}, "IpProtocol": "tcp", "FromPort": "2379", "ToPort": "2379", "SourceSecurityGroupId": {
          "Fn::GetAtt" : [ "CoreOSSecurityGroup", "GroupId" ]
        }
      }
    },
    "Ingress2380": {
      "Type": "AWS::EC2::SecurityGroupIngress",
      "Properties": {
        "GroupName": {"Ref": "CoreOSSecurityGroup"}, "IpProtocol": "tcp", "FromPort": "2380", "ToPort": "2380", "SourceSecurityGroupId": {
          "Fn::GetAtt" : [ "CoreOSSecurityGroup", "GroupId" ]
        }
      }
    },
    "cliROrole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "ec2.amazonaws.com"
                ]
              },
              "Action": [
                "sts:AssumeRole"
              ]
            }
          ]
        },
        "Policies": [
          {
            "PolicyName": "CLIROAccess",
            "PolicyDocument": {
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": [
                    "ec2:Describe*"
                  ],
                  "Resource": "*"
                },
                {
                  "Effect": "Allow",
                  "Action": [
                    "autoscaling:Describe*"
                  ],
                  "Resource": "*"
                }
              ]
            }
          }
        ],
        "Path": "/"
      }
    },
    "CLIROAccessProfile": {
      "Type": "AWS::IAM::InstanceProfile",
      "Properties": {
        "Path": "/",
        "Roles": [
          {
            "Ref": "cliROrole"
          }
        ]
      }
    },
    "CoreOSServerAutoScale": {
      "Type": "AWS::AutoScaling::AutoScalingGroup",
      "Properties": {
        "AvailabilityZones": {"Fn::GetAZs": ""},
        "LaunchConfigurationName": {"Ref": "CoreOSServerLaunchConfig"},
        "MinSize": "3",
        "MaxSize": "9",
        "DesiredCapacity": {"Ref": "ClusterSize"},
        "Tags": [
            {"Key": "Name", "Value": { "Ref" : "AWS::StackName" }, "PropagateAtLaunch": true}
        ]
      }
    },
    "CoreOSServerLaunchConfig": {
      "Type": "AWS::AutoScaling::LaunchConfiguration",
      "Properties": {
        "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
        "InstanceType": {"Ref": "InstanceType"},
        "KeyName": {"Ref": "KeyPair"},
        "SecurityGroups": [{"Ref": "CoreOSSecurityGroup"}],
        "IamInstanceProfile": {"Ref": "CLIROAccessProfile"},
        "UserData" : { "Fn::Base64":
          { "Fn::Join": [ "", [
            "#cloud-config\n\n",
            "coreos:\n",
            "  etcd2:\n",
			"    advertise-client-urls: http://$", { "Ref": "AdvertisedIPAddress" }, "_ipv4:2379\n",
			"    initial-advertise-peer-urls: http://$", { "Ref": "AdvertisedIPAddress" }, "_ipv4:2380\n",
			"    listen-client-urls: http://0.0.0.0:2379\n",
			"    listen-peer-urls: http://$", { "Ref": "AdvertisedIPAddress" }, "_ipv4:2380\n",
            "  units:\n",
            "    - name: etcd2.service\n",
            "      command: stop\n",
            "    - name: etcd-peers.service\n",
			"      command: start\n",
      		"      content: |\n",
      		"        [Unit]\n",
      		"        Description=Write a file with the etcd peers that we should bootstrap to\n",
      		"        [Service]\n",
      		"        Restart=on-failure\n",
      		"        RestartSec=10\n",
      		"        ExecStartPre=/usr/bin/docker pull monsantoco/etcd-aws-cluster:latest\n",
      		"        ExecStartPre=/usr/bin/docker run --rm=true -v /etc/sysconfig/:/etc/sysconfig/ monsantoco/etcd-aws-cluster:latest\n",
      		"        ExecStart=/usr/bin/systemctl start etcd2\n",
            "    - name: fleet.service\n",
            "      command: start\n",
            "write_files:\n",
            "  - path: /etc/systemd/system/etcd2.service.d/30-etcd_peers.conf\n",
			"    permissions: 0644\n",
			"    content: |\n",
			"      [Service]\n",
			"      # Load the other hosts in the etcd leader autoscaling group from file\n",
			"      EnvironmentFile=/etc/sysconfig/etcd-peers\n"
            ] ]
          }
        }
      }
    },
        "CoreOSProxyAutoScale": {
      "Type": "AWS::AutoScaling::AutoScalingGroup",
      "Properties": {
        "AvailabilityZones": {"Fn::GetAZs": ""},
        "LaunchConfigurationName": {"Ref": "CoreOSProxyLaunchConfig"},
        "MinSize": "0",
        "MaxSize": "9",
        "DesiredCapacity": {"Ref": "ProxyClusterSize"},
        "Tags": [
            {"Key": "Name", "Value": { "Ref" : "AWS::StackName" }, "PropagateAtLaunch": true}
        ]
      }
    },
    "CoreOSProxyLaunchConfig": {
      "Type": "AWS::AutoScaling::LaunchConfiguration",
      "Properties": {
        "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
        "InstanceType": {"Ref": "InstanceType"},
        "KeyName": {"Ref": "KeyPair"},
        "SecurityGroups": [{"Ref": "CoreOSSecurityGroup"}],
        "IamInstanceProfile": {"Ref": "CLIROAccessProfile"},
        "UserData" : { "Fn::Base64":
          { "Fn::Join": [ "", [
            "#cloud-config\n\n",
            "coreos:\n",
            "  etcd2:\n",
			"    advertise-client-urls: http://$", { "Ref": "AdvertisedIPAddress" }, "_ipv4:2379\n",
			"    initial-advertise-peer-urls: http://$", { "Ref": "AdvertisedIPAddress" }, "_ipv4:2380\n",
			"    listen-client-urls: http://0.0.0.0:2379\n",
			"    listen-peer-urls: http://$", { "Ref": "AdvertisedIPAddress" }, "_ipv4:2380\n",
            "  units:\n",
            "    - name: etcd2.service\n",
            "      command: stop\n",
            "    - name: etcd-peers.service\n",
			"      command: start\n",
      		"      content: |\n",
      		"        [Unit]\n",
      		"        Description=Write a file with the etcd peers that we should bootstrap to\n",
      		"        [Service]\n",
      		"        Restart=on-failure\n",
      		"        RestartSec=10\n",
      		"        ExecStartPre=/usr/bin/docker pull monsantoco/etcd-aws-cluster:latest\n",
      		"        ExecStartPre=/usr/bin/docker run -e PROXY_ASG=", { "Ref": "CoreOSServerAutoScale" } ," --rm=true -v /etc/sysconfig/:/etc/sysconfig/ monsantoco/etcd-aws-cluster:latest\n",
      		"        ExecStart=/usr/bin/systemctl start etcd2\n",
            "    - name: fleet.service\n",
            "      command: start\n",
            "write_files:\n",
            "  - path: /etc/systemd/system/etcd2.service.d/30-etcd_peers.conf\n",
			"    permissions: 0644\n",
			"    content: |\n",
			"      [Service]\n",
			"      # Load the other hosts in the etcd leader autoscaling group from file\n",
			"      EnvironmentFile=/etc/sysconfig/etcd-peers\n"
            ] ]
          }
        }
      }
    }
  }
}