ec2_approval_template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'A sample AWS Cloudformation template to demonstrate a provisioning of EC2 Linux Instance from defined list of instance types. 
              This template has a wait condition which can be used to trigger a approval workflow. This template depends on a stack to import values 
              that are required to lookup a linux ami id and also trigger approval workflow'
Metadata:
  LICENSE: >-
    MIT No Attribution
    
    Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
    
    Permission is hereby granted, free of charge, to any person obtaining a copy of this
    software and associated documentation files (the "Software"), to deal in the Software
    without restriction, including without limitation the rights to use, copy, modify,
    merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so.
    
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
    INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Parameters:
  BusinessEntity:
    Type: String
    AllowedValues:
      - business_entity_1
      - business_entity_2
      - business_entity_3
      - business_entity_4
    ConstraintDescription: must be the name of the business entity
    Description: Name of the Business Entity
    Default: business_entity_1
  InstanceType:
    AllowedValues:
    - t2.nano
    - t2.micro
    - t2.small
    - t2.medium
    - t2.large
    - t2.xlarge
    - m4.large
    - m4.xlarge
    - m4.2xlarge
    - m4.4xlarge
    - m4.10xlarge
    - c4.large
    - c4.xlarge
    - c4.2xlarge
    - c4.4xlarge
    - c4.8xlarge
    - r3.large
    - r3.xlarge
    - r3.2xlarge
    - r3.4xlarge
    - r3.8xlarge
    - i2.xlarge
    - i2.2xlarge
    - i2.4xlarge
    - i2.8xlarge
    - d2.xlarge
    - d2.2xlarge
    - d2.4xlarge
    - d2.8xlarge
    ConstraintDescription: must be a valid EC2 instance type.
    Default: t2.small
    Description: EC2 instance type
    Type: String
  KeyName:
    ConstraintDescription: must be the name of an existing EC2 KeyPair.
    Description: Name of an existing EC2 KeyPair to enable SSH access to the instances
    Type: AWS::EC2::KeyPair::KeyName
  SSHLocation:
    AllowedPattern: (\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})
    ConstraintDescription: must be a valid IP CIDR range of the form x.x.x.x/x.
    Default: 0.0.0.0/0
    Description: The IP address range that can be used to SSH to the EC2 instances
    MaxLength: '18'
    MinLength: '9'
    Type: String
  UserEmail:
    AllowedPattern: '[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}'
    ConstraintDescription: This is not a valid email id.
    Default: "abc.xyz@email.com"
    Description: Enter your Email ID. You will be contacted by approver for more information.
    MaxLength: '64'
    MinLength: '1'
    Type: String
Mappings:
  AWSInstanceType2Arch:
    t2.micro:
      Arch: HVM64
    t2.small:
      Arch: HVM64
    t2.medium:
      Arch: HVM64
    t2.nano:
      Arch: HVM64
    t2.xlarge:
      Arch: HVM64
    t2.large:
      Arch: HVM64
    t2.2xlarge:
      Arch: HVM64
    m4.large:
      Arch: HVM64
    m4.xlarge:
      Arch: HVM64
    m4.2xlarge:
      Arch: HVM64
    m4.4xlarge:
      Arch: HVM64
    m4.10xlarge:
      Arch: HVM64
    c4.large:
      Arch: HVM64
    c4.xlarge:
      Arch: HVM64
    c4.2xlarge:
      Arch: HVM64
    c4.4xlarge:
      Arch: HVM64
    c4.8xlarge:
      Arch: HVM64
    r3.large:
      Arch: HVM64
    r3.xlarge:
      Arch: HVM64
    r3.2xlarge:
      Arch: HVM64
    r3.4xlarge:
      Arch: HVM64
    r3.8xlarge:
      Arch: HVM64
    i2.xlarge:
      Arch: HVM64
    i2.2xlarge:
      Arch: HVM64
    i2.4xlarge:
      Arch: HVM64
    i2.8xlarge:
      Arch: HVM64
    d2.xlarge:
      Arch: HVM64
    d2.2xlarge:
      Arch: HVM64
    d2.4xlarge:
      Arch: HVM64
    d2.8xlarge:
      Arch: HVM64
Resources:
  WaitHandle:
    Type: 'AWS::CloudFormation::WaitConditionHandle'
  WaitCondition:
    Type: 'AWS::CloudFormation::WaitCondition'
    Properties:
      Handle:
        Ref: 'WaitHandle'
      Timeout: '43200'
  SaveRequestFunction:
    Type: Custom::SaveRequestFunction
    Properties:
      ServiceToken: 
        !ImportValue "<name-of-stack-deployed-in-step-1>-SaveRequestLambda" # Replace with output of CloudFormation template deployed in Step 1
      WaitUrl: !Ref WaitHandle
      EmailID: !Ref UserEmail
      ImageId: !GetAtt GetAMIInfo.Id
      InstanceType: !Ref InstanceType
      ProductName: EC2-LINUX
      BusinessEntity: !Ref BusinessEntity
      StackName: !Ref AWS::StackName
      EC2Pricing: !GetAtt GetEC2PricingInfo.Pricing
  GetAMIInfo:
    Type: Custom::GetAMIInfo
    Properties:
      ServiceToken: 
        !ImportValue "<name-of-stack-deployed-in-step-1>-LinuxAMILookupLambda" # Replace with output of CloudFormation template deployed in Step 1
      Architecture: !FindInMap [AWSInstanceType2Arch, !Ref InstanceType, Arch]
  GetEC2PricingInfo:
    Type: Custom::GetEC2PricingInfo
    Properties:
      ServiceToken: 
        !ImportValue "<name-of-stack-deployed-in-step-1>-EC2PricingLambda" # Replace with output of CloudFormation template deployed in Step 1
      InstanceType: !Ref InstanceType
      OperatingSystem: Linux
      TermType: OnDemand
  LinuxEC2Instance:
    Type: AWS::EC2::Instance
    DependsOn: 'WaitCondition'
    Properties:
      ImageId: !GetAtt GetAMIInfo.Id
      InstanceType:
        Ref: InstanceType
      KeyName:
        Ref: KeyName
      SecurityGroups:
        - Ref: LinuxEC2SecurityGroup
      Tags:
        - Key: business-entity
          Value: !Ref BusinessEntity
  LinuxEC2SecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Metadata:
        cfn_nag:
          rules_to_suppress:
            - id: W40
              reason: 'this is a sample template demonstrating ec2 in public subnet'
    DependsOn: 'WaitCondition'
    Properties:
      GroupDescription: "Enable ssh access via port 22 to specified CIDR"
      SecurityGroupEgress:
        - IpProtocol: -1
          Description: 'allow outbound traffic'
      SecurityGroupIngress:
        - CidrIp: !Ref SSHLocation
          Description: 'allow ssh access'
          FromPort: '22'
          IpProtocol: tcp
          ToPort: '22'
Outputs:
  EC2PublicIP:
    Description: Requested EC2 public IP
    Value: !GetAtt LinuxEC2Instance.PublicIp