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README.md

AWS Basics Using CloudFormation (Reference Demo)

This project covers the basics of AWS's VPC, EC2 and ELB through the use of a CloudFormation template.

This project does the following, all within a the template:

  • Sets up a new VPC, a NAT instance, one public, and one private subnet.
  • Creates 2 Apache instances running Amazon Linux behind an ELB.
  • Using user data, all 3 instances (including the NAT instance) are updated, and rebooted.
  • Also through user data, the 2 Apache instances have Apache installed on them, and their server ID is written to an index file.

The end result of this is that one can simply run curl on the ELB IP and get a round-robin output of the server names.

Required Tools

awscli needs to be installed and properly configured with an IAM key and secret. For more info, see https://github.com/aws/aws-cli.

The CloudFormation template has all the AMIs and RegionMap entries necessary to run this template in either of the 3 US regions (us-east-1, us-west-1, and us-west-2).

Running This Project

To run this project yourself, just download the repo and run:

aws cloudformation create-stack --stack-name vcts-lab-stack \
  --template-body file:///full/path/to/project/cfn-stack.json
  --parameters ParameterKey=KeyPair,ParameterValue=KEYPAIRNAME \
  ParameterKey=SSHAllowIPAddress,ParameterValue=IPADDR/32

aws cloudformation expects the template file:// URL to be a absolute path. Also, SSHAllowIPAddress expects IPADDR/32. The explicit nature of the constraint both serves to explain security group ACL syntax, and to reinforce that this is a single-host entry.

The template can also be downloaded and uploaded through the CloudFormation UI. Parameters will be prompted during the upload process.

Author

Chris Marchesi chrism@vancluevertech.com

License

This work is licensed under the Creative Commons Attribution 4.0 International License, which can be found at:

http://creativecommons.org/licenses/by/4.0/legalcode

A full copy can also be found in the LICENSE file.

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