Learn how to create a Bastion server in CloudFormation

To create a Bastion server the use of AWS CloudFormation, you wish to have to outline the important sources in a CloudFormation template. Right here’s an instance of the way you’ll create a Bastion server the use of CloudFormation:

AWSTemplateFormatVersion: "2010-09-09"
Assets:
  BastionSecurityGroup:
    Kind: AWS::EC2::SecurityGroup
    Homes:
      GroupDescription: Bastion Safety Crew
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: 0.0.0.0/0
      VpcId: "your-vpc-id"
  BastionInstance:
    Kind: AWS::EC2::Example
    Homes:
      ImageId: "your-ami-id"
      InstanceType: "t2.micro"  # Replace with the required example kind
      SecurityGroupIds:
        - !Ref BastionSecurityGroup
      KeyName: "your-key-pair-name"
      UserData:
        Fn::Base64: !Sub |
          #!/bin/bash
          echo "AllowTcpForwarding sure" >> /and many others/ssh/sshd_config
          provider sshd restart
          iptables -t nat -A PREROUTING -p tcp --dport 22 -j REDIRECT --to-port 2222
          iptables-save > /and many others/sysconfig/iptables
          systemctl permit iptables
          systemctl restart iptables
  BastionEIP:
    Kind: AWS::EC2::EIP
    Homes:
      InstanceId: !Ref BastionInstance

Within the CloudFormation template:

1. The BastionSecurityGroup useful resource creates a safety team permitting SSH get admission to on port 22 from any IP cope with (0.0.0.0/0). Be sure you substitute "your-vpc-id" with the ID of your VPC.
2. The BastionInstance useful resource creates an EC2 example the use of the required Amazon Gadget Symbol (AMI) and example kind. Replace "your-ami-id" with the ID of the required AMI, and "your-key-pair-name" with the call of your EC2 key pair.
3. The UserData assets runs a chain of instructions at the Bastion example to permit SSH forwarding, redirect SSH visitors from port 22 to 2222 (helpful when you’ve got different products and services already the use of port 22), and restart the important products and services.
4. The BastionEIP useful resource pals an Elastic IP (EIP) with the Bastion example, offering it with a static public IP cope with.

Remember to have the important permissions to create EC2 circumstances, safety teams, and EIPs to your AWS account ahead of deploying this CloudFormation template. Regulate the template in line with your particular necessities.