CloudFormation / WaitCondition / WaitConditionHandler example

gistfile1.txt

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Mappings" : {
        "RegionMap" : {
            "us-east-1" : {
                "AMI" : "ami-76f0061f"
            },
            "us-west-1" : {
                "AMI" : "ami-655a0a20"
            },
            "eu-west-1" : {
                "AMI" : "ami-7fd4e10b"
            },
            "ap-northeast-1" : {
                "AMI" : "ami-8e08a38f"
            },
            "ap-southeast-1" : {
                "AMI" : "ami-72621c20"
            },
            "ap-southeast-2" : {
                "AMI" : "ami-db704cb8"
            }
        }
    },
    "Resources" : {
        "SSHServerSecurityGroup" : {
          "Type" : "AWS::EC2::SecurityGroup",
          "Properties" : {
            "VpcId" : "vpc-fdcfd098",
            "GroupDescription" : "Allow SSH access",
            "SecurityGroupIngress" : [
              {"IpProtocol" : "tcp", "FromPort" : "22", "ToPort" : "22", "CidrIp" : "<REDACTED>"}
            ]
          }
        },
        "Ec2Instance" : {
            "Type" : "AWS::EC2::Instance",
            "Properties" : {
                "UserData" : { "Fn::Base64" : {"Ref" : "myWaitHandle"}},
                "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
                "KeyName" : "SHTestKey",
                "InstanceType" : "t2.micro",
                "NetworkInterfaces" : [ {
                  "AssociatePublicIpAddress" : "true",
                  "DeviceIndex" : "0",
                  "GroupSet" : [ {"Ref" : "SSHServerSecurityGroup"} ],
                  "SubnetId" : "subnet-eccc6988"
                } ],
            }
        },
        "myWaitHandle" : {
            "Type" : "AWS::CloudFormation::WaitConditionHandle",
            "Properties" : {
            }
        },
        "myWaitCondition" : {
            "Type" : "AWS::CloudFormation::WaitCondition",
            "DependsOn" : "Ec2Instance",
            "Properties" : {
                "Handle" : { "Ref" : "myWaitHandle" },
                "Timeout" : "4500"
            }
        },
        "Ec2Instance2" : {
            "Type" : "AWS::EC2::Instance",
            "DependsOn": "myWaitCondition",
            "Properties" : {
                "UserData" : { "Fn::Base64" : { "Fn::GetAtt" : [ "myWaitCondition", "Data" ] }},
                "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
                "KeyName" : "SHTestKey",
                "InstanceType" : "t2.micro",
                "NetworkInterfaces" : [ {
                  "AssociatePublicIpAddress" : "true",
                  "DeviceIndex" : "0",
                  "GroupSet" : [ {"Ref" : "SSHServerSecurityGroup"} ],
                  "SubnetId" : "subnet-eccc6988"
                } ],
            }
        }
    },
    "Outputs" : {
        "ApplicationData" : {
            "Value" : { "Fn::GetAtt" : [ "myWaitCondition", "Data" ]},
            "Description" : "The data passed back as part of signalling the WaitCondition."
        }
    }
}