Break cloudformation file into smaller scripts

Question

I have large cloudformation json file which I used to create new vpc, subnets, ec2 instance. Basically looking into breaking file into multiple small file for easy maintenance.

How do I create a) create_vpc.json and vpc_param.json file. b) how do I get list of vpc from aws cli and pass vpc name/id to create_subnet.json and define subnet_param.json. c) get list of subnet for a vpc using aws cli and pass that as arguments to create_routetable.json and routetable_param.json

Similarly want to create other scripts for ec2/elb/other stuffs.

aws cloudformation create-stack --stackname startmyinstance  --template-body file:///some/local/path/templates/startmyinstance.json --parameters file:///some/local/path/params/startmyinstance-parameters.json

my current file is :

 {
   "AWSTemplateFormatVersion": "2010-09-09",
   "Description": " Tempalte to launch Custom VPC with two availablilty zones. **WARNING** This template might create one or more Amazon EC2 instances. You will be billed for the AWS resources used if you create a stack from this template.",
   "Parameters": {
      "KeyName": {
         "Description": "Name of an existing EC2 KeyPair to enable SSH access to the instances",
         "Type": "String",
         "MinLength": "1",
         "MaxLength": "64",
         "AllowedPattern": "[-_ a-zA-Z0-9]*",
         "Default": "Helix-PROD",
         "ConstraintDescription": "can contain only alphanumeric characters, spaces, dashes and underscores."
      },
      "VpcCidr": {
         "Description": "CIDR address for the VPC to be created.",
         "Type": "String",
         "Default": "10.206.36.0/22"
      },
      "SUB1": {
         "Description": "subnet1.",
         "Type": "String",
         "Default": "10.206.36.0/27"
      },
      "SUB2": {
         "Description": "subnet2",
         "Type": "String",
         "Default": "10.206.36.32/27"
      },

      "AvailabilityZone1": {
         "Description": "First AZ to use for Public1/private1 subnets.",
         "Type": "AWS::EC2::AvailabilityZone::Name",
         "Default": "eu-west-1a"
      },
      "AvailabilityZone2": {
         "Description": "First AZ to use for Public2/private2 subnets.",
         "Type": "AWS::EC2::AvailabilityZone::Name",
         "Default": "eu-west-1b"
      },
   },
   "Mappings": {
      "RegionMap": {

         "eu-west-1": {
            "64": "ami-70edb016"
         }
      }

   },

   "Resources": {
      "VPC": {
         "Type": "AWS::EC2::VPC",
         "Properties": {
            "CidrBlock": {
               "Ref": "VpcCidr"
            },
            "Tags": [{
               "Key": "Network",
               "Value": "Public"
            }]
         }
      },
      "Sub1": {
         "Type": "AWS::EC2::Subnet",
         "Properties": {
            "VpcId": {
               "Ref": "VPC"
            },
            "AvailabilityZone": {
               "Ref": "AvailabilityZone1"
            },
            "CidrBlock": {
               "Ref": "subnet1"
            },
            "Tags": [{
               "Key": "Network",
               "Value": "Private"
            }, {
               "Key": "Name",
               "Value": "Sub1"
            }]
         }
      },
      "Sub2": {
         "Type": "AWS::EC2::Subnet",
         "Properties": {
            "VpcId": {
               "Ref": "VPC"
            },
            "AvailabilityZone": {
               "Ref": "AvailabilityZone2"
            },
            "CidrBlock": {
               "Ref": "subnet2"
            },
            "Tags": [{
               "Key": "Network",
               "Value": "Private"
            }, {
               "Key": "Name",
               "Value": "Sub2"
            }]
         }
      },
   }
}

Eugene Manuilov Eugene Manuilov · Accepted Answer · 2019-01-05T20:34:02

You can use cfpack.js for this. It allows you to use multiple smaller templates that will be built into one bigger template and deployed to your CloudFormation stack.

Break cloudformation file into smaller scripts

2 Answers