AWS07: Cloudformation (Provision subnets linked to VPC stack)

Tutorial:

We will set up 2 subnets on provisioned VPC exactly same way of previous post.

In below template, "NetworkStackNameParameter" is defined as we can specify provisioned VPC stack "cf-vpc-igw" during subnets stack creation.
Public route is added to "Subnet01" as we need to communicate bastion server via ssh.
On outputs, 2 subnets value are exported as we will refer them another stacks we will create later.

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description" : "Subnets.",

    "Parameters" : {
        "NetworkStackNameParameter": {
            "Type" : "String"
        }  
    },

    "Resources" : {
      "Subnet01" : {
        "Type" : "AWS::EC2::Subnet",
        "DeletionPolicy" : "Delete",
        "Properties" : {
          "VpcId" : { "Fn::ImportValue" : {"Fn::Sub": "${NetworkStackNameParameter}-VPCID" } },
          "CidrBlock" : "10.0.0.0/25",
          "AvailabilityZone" : "ap-northeast-1a",
          "Tags" : [{ "Key" : "Name", "Value" : "Subnet-01" }]
        }
      },

      "Subnet02" : {
        "Type" : "AWS::EC2::Subnet",
        "DeletionPolicy" : "Delete",
        "Properties" : {
          "VpcId" : { "Fn::ImportValue" : {"Fn::Sub": "${NetworkStackNameParameter}-VPCID" } },
          "CidrBlock" : "10.0.0.128/25",
          "AvailabilityZone" : "ap-northeast-1c",
          "Tags" : [{ "Key" : "Name", "Value" : "Subnet-02" }]
        }
      },
    
      "PublicRouteTable" : {
        "Type" : "AWS::EC2::RouteTable",
        "Properties" : {
          "VpcId" : { "Fn::ImportValue" : {"Fn::Sub": "${NetworkStackNameParameter}-VPCID" } } 
        }
      },
      "PublicRoute" : {
        "Type" : "AWS::EC2::Route",
        "Properties" : {
          "RouteTableId" : { "Ref" : "PublicRouteTable" },
          "DestinationCidrBlock" : "0.0.0.0/0",
          "GatewayId" : { "Fn::ImportValue" : {"Fn::Sub": "${NetworkStackNameParameter}-InternetGateway" } } 
        }
      },
      "PublicSubnetRouteTableAssociation" : {
        "Type" : "AWS::EC2::SubnetRouteTableAssociation",
        "Properties" : {
          "SubnetId" : { "Ref" : "Subnet01" },
          "RouteTableId" : { "Ref" : "PublicRouteTable" }
        }
      }
    },
    
    "Outputs" : {
      "Subnet01" : {
        "Description" : "The subnet ID to use for public web servers",
        "Value" :  { "Ref" : "Subnet01" },
        "Export" : { "Name" : {"Fn::Sub": "${AWS::StackName}-Subnet01" }}
      },
      "Subnet02" : {
        "Description" : "The subnet ID to use for public web servers",
        "Value" :  { "Ref" : "Subnet02" },
        "Export" : { "Name" : {"Fn::Sub": "${AWS::StackName}-Subnet02" }}
      }
    }
    
}

See more detailed information of each element on here.

Here's a video tutorial for this.