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chef/cookbooks/heat/templates/suse/loadbalancer.template.erb

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{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "Built in HAProxy server",
  "Parameters" : {
    "KeyName" : {
      "Type" : "String"
    }
  },
  "Resources": {
    "CfnLBUser" : {
      "Type" : "AWS::IAM::User"
    },
    "CfnLBAccessKey" : {
      "Type" : "AWS::IAM::AccessKey",
      "Properties" : {
        "UserName" : {"Ref": "CfnLBUser"}
      }
    },
    "LB_instance": {
      "Type": "AWS::EC2::Instance",
      "Metadata": {
        "AWS::CloudFormation::Init": {
          "config": {
            "packages": {
              "zypper": {
                "cron"           : [],
                "haproxy"        : [],
                "socat"          : [],
                "python-psutil"  : []
              }
            },
            "services": {
              "sysvinit": {
                "cron"     : { "enabled" : "true", "ensureRunning" : "true" }
              }
            },
            "files": {
              "/etc/cfn/cfn-credentials" : {
                "content" : { "Fn::Join" : ["", [
                  "AWSAccessKeyId=", { "Ref" : "CfnLBAccessKey" }, "\n",
                  "AWSSecretKey=", {"Fn::GetAtt": ["CfnLBAccessKey",
                                    "SecretAccessKey"]}, "\n"
                ]]},
                "mode"    : "000400",
                "owner"   : "root",
                "group"   : "root"
              },
              "/etc/cfn/cfn-hup.conf" : {
                "content" : { "Fn::Join" : ["", [
                  "[main]\n",
                  "stack=", { "Ref" : "AWS::StackId" }, "\n",
                  "credential-file=/etc/cfn/cfn-credentials\n",
                  "region=", { "Ref" : "AWS::Region" }, "\n",
                  "interval=60\n"
                ]]},
                "mode"    : "000400",
                "owner"   : "root",
                "group"   : "root"
              },
              "/etc/cfn/hooks.conf" : {
                "content": { "Fn::Join" : ["", [
                  "[cfn-init]\n",
                  "triggers=post.update\n",
                  "path=Resources.LB_instance.Metadata\n",
                  "action=/opt/aws/bin/cfn-init -s ",
                  { "Ref": "AWS::StackId" },
                  "    -r LB_instance ",
                  "    --region ", { "Ref": "AWS::Region" }, "\n",
                  "runas=root\n",
                  "\n",
                  "[reload]\n",
                  "triggers=post.update\n",
                  "path=Resources.LB_instance.Metadata\n",
                  "action=service haproxy restart\n",
                  "runas=root\n"
                ]]},
                "mode"    : "000400",
                "owner"   : "root",
                "group"   : "root"
              },
              "/etc/haproxy/haproxy.cfg": {
                "content": "",
                "mode": "000644",
                "owner": "root",
                "group": "root"
              },
              "/tmp/cfn-hup-crontab.txt" : {
                "content" : { "Fn::Join" : ["", [
                "MAIL=\"\"\n",
                "\n",
                "* * * * * /opt/aws/bin/cfn-hup -f\n",
                "* * * * * /opt/aws/bin/cfn-push-stats ",
                " --haproxy\n"
                ]]},
                "mode"    : "000600",
                "owner"   : "root",
                "group"   : "root"
              }
            }
          }
        }
      },
      "Properties": {
        "ImageId": "SLE11SP3-x86_64-cfntools",
        "InstanceType": "m1.small",
        "KeyName": { "Ref": "KeyName" },
        "UserData": { "Fn::Base64": { "Fn::Join": ["", [
          "#!/bin/bash -v\n",
          "# Helper function\n",
          "function error_exit\n",
          "{\n",
          "  /opt/aws/bin/cfn-signal -e 1 -r \"$1\" '",
          { "Ref" : "WaitHandle" }, "'\n",
          "  exit 1\n",
          "}\n",

          "/opt/aws/bin/cfn-init -s ",
          { "Ref": "AWS::StackId" },
          "    -r LB_instance ",
          "    --region ", { "Ref": "AWS::Region" }, "\n",
          "# install cfn-hup crontab\n",
          "crontab /tmp/cfn-hup-crontab.txt\n",

          "# LB setup completed, signal success\n",
          "/opt/aws/bin/cfn-signal -e 0 -r \"LB server setup complete\" '",
          { "Ref" : "WaitHandle" }, "'\n"

        ]]}}
      }
    },
    "WaitHandle" : {
      "Type" : "AWS::CloudFormation::WaitConditionHandle"
    },

    "WaitCondition" : {
      "Type" : "AWS::CloudFormation::WaitCondition",
      "DependsOn" : "LB_instance",
      "Properties" : {
        "Handle" : {"Ref" : "WaitHandle"},
        "Timeout" : "600"
      }
    }
  },

  "Outputs": {
    "PublicIp": {
      "Value": { "Fn::GetAtt": [ "LB_instance", "PublicIp" ] },
      "Description": "instance IP"
    }
  }
}