What is happening when we try to create stack from template
- Creating Template locally
- Create a stack & we are uploading template
- Templates are stored in S3 Buckets
- The AWS Reads the template and performs IAC
- Refer Here for cloudformation introduction
Start Building From where we left
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "This is my first cf template",
"Parameters": {
"subnet1az": {
"Description": "Enter subnet1 az",
"Type": "String",
"Default": "us-west-2a"
},
"subnet2az": {
"Description": "Enter subnet1 az",
"Type": "String",
"Default": "us-west-2b"
},
"subnet3az": {
"Description": "Enter subnet1 az",
"Type": "String",
"Default": "us-west-2c"
}
},
"Resources": {
"myvpc": {
"Type": "AWS::EC2::VPC",
"Properties": {
"CidrBlock": "10.1.0.0/16",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet1": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet1az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.0.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet2": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet2az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.1.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet3": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet3az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.2.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
}
}
}
- The limitation as of now in the above template is "we allow user to enter free hand text"
- Lets add a paramater with allowed values
"subnet1az": {
"Description": "Enter subnet1 az",
"Type": "String",
"Default": "us-west-2a",
"AllowedValues": ["us-west-2a", "us-west-2b", "us-west-2c"]
}
- The whole template is as follows
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "This is my first cf template",
"Parameters": {
"subnet1az": {
"Description": "Enter subnet1 az",
"Type": "String",
"Default": "us-west-2a",
"AllowedValues": ["us-west-2a", "us-west-2b", "us-west-2c"]
},
"subnet2az": {
"Description": "Enter subnet1 az",
"Type": "String",
"Default": "us-west-2b",
"AllowedValues": ["us-west-2a", "us-west-2b", "us-west-2c"]
},
"subnet3az": {
"Description": "Enter subnet1 az",
"Type": "String",
"Default": "us-west-2c",
"AllowedValues": ["us-west-2a", "us-west-2b", "us-west-2c"]
}
},
"Resources": {
"myvpc": {
"Type": "AWS::EC2::VPC",
"Properties": {
"CidrBlock": "10.1.0.0/16",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet1": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet1az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.0.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet2": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet2az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.1.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet3": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet3az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.2.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
}
}
}
-
While executing template to create stack now user will have a drop down list not a free hand text.
-
Problem is cannot work with other regions apart from oregon
-
What is the solution ?
- One solution is to use interpolation
- Refer Supported AWS-Specific Parameter Types in here
- Lets use the type defined for Availability Zone and relook at our script
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "This is my first cf template",
"Parameters": {
"subnet1az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"subnet2az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"subnet3az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
}
},
"Resources": {
"myvpc": {
"Type": "AWS::EC2::VPC",
"Properties": {
"CidrBlock": "10.1.0.0/16",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet1": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet1az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.0.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet2": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet2az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.1.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet3": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet3az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.2.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
}
}
}
- Lets add internet gateway, route table & route to internet gateway
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "This is my first cf template",
"Parameters": {
"subnet1az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"subnet2az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"subnet3az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
}
},
"Resources": {
"myvpc": {
"Type": "AWS::EC2::VPC",
"Properties": {
"CidrBlock": "10.1.0.0/16",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet1": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet1az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.0.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet2": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet2az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.1.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet3": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet3az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.2.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"myigw": {
"Type": "AWS::EC2::InternetGateway",
"Properties": {
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"AttachGateway": {
"Type": "AWS::EC2::VPCGatewayAttachment",
"Properties": {
"VpcId": {
"Ref": "myvpc"
},
"InternetGatewayId": {
"Ref": "myigw"
}
}
},
"myrt": {
"Type": "AWS::EC2::RouteTable",
"Properties": {
"VpcId": {
"Ref": "myvpc"
},
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"igwroute": {
"Type": "AWS::EC2::Route",
"Properties": {
"RouteTableId": {
"Ref": "myrt"
},
"DestinationCidrBlock": "0.0.0.0/0",
"GatewayId": {
"Ref": "myigw"
}
}
}
}
}
- Lets add route table associations with subnets as mentioned above
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "This is my first cf template",
"Parameters": {
"subnet1az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"subnet2az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"subnet3az": {
"Description": "Enter subnet1 az",
"Type": "AWS::EC2::AvailabilityZone::Name"
}
},
"Resources": {
"myvpc": {
"Type": "AWS::EC2::VPC",
"Properties": {
"CidrBlock": "10.1.0.0/16",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet1": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet1az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.0.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet2": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet2az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.1.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"mysubnet3": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": {
"Ref": "subnet3az"
},
"VpcId": {
"Ref": "myvpc"
},
"CidrBlock": "10.1.2.0/24",
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"myigw": {
"Type": "AWS::EC2::InternetGateway",
"Properties": {
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"AttachGateway": {
"Type": "AWS::EC2::VPCGatewayAttachment",
"Properties": {
"VpcId": {
"Ref": "myvpc"
},
"InternetGatewayId": {
"Ref": "myigw"
}
}
},
"myrt": {
"Type": "AWS::EC2::RouteTable",
"Properties": {
"VpcId": {
"Ref": "myvpc"
},
"Tags": [
{
"Key": "Name",
"Value": "From VsCode"
}
]
}
},
"igwroute": {
"Type": "AWS::EC2::Route",
"Properties": {
"RouteTableId": {
"Ref": "myrt"
},
"DestinationCidrBlock": "0.0.0.0/0",
"GatewayId": {
"Ref": "myigw"
}
}
},
"subnet1rt": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"Properties": {
"SubnetId": {
"Ref": "mysubnet1"
},
"RouteTableId": {
"Ref": "myrt"
}
}
},
"subnet2rt": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"Properties": {
"SubnetId": {
"Ref": "mysubnet2"
},
"RouteTableId": {
"Ref": "myrt"
}
}
},
"mysubnet3rt": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"Properties": {
"SubnetId": {
"Ref": "mysubnet3"
},
"RouteTableId": {
"Ref": "myrt"
}
}
}
}
}
