irahulgulati / blue-green-deployment

AWS blue green deployment strategy using Terraform, Packer and Ansible

A fully automated pipeline which provisions the infrastructure and deploy the applications

Contributed by irahulgulati

Technologies Used

1. Packer
2. Ansible
3. AWS
4. Terraform
5. Bash Script
6. Nginx
7. Make

Setup

1. Install Packer via this link.
2. Install Terraform via this link.
3. (Needed by Packer)Set your aws credentials via environment variable with following keynames:
   • ACCESS_KEY
   • SECRET_KEY
4. (Optional)Install Make via this link or use repository for *nix operating system.
5. Change the current directory to packer and run following commands:
   • packer validate nginx_web_server.json
   • packer validate app_server.json
6. Next step is to build the AMI if the validation is successful
   • packer build nginx_web_server.json
   • packer build app_server.json Note: This process will take time as it will provision a temporary EC2 instance, install Ansible on it, use Ansible to configure the image and then tag that image and store it in AWS.
7. (Needed by Terraform) Make sure that your aws cli is installed and is configured with the credentials using "aws configure" command.
8. Change the directory to respective deployment and run following commands, usually the order should be like below for first time.
   • common-blue-green
   • blue(for live production infrastructure)
   • green(for the latest updated version of app and/or infrastructure, when needed)
9. Change your directory to terraform and run below command to initiate the terraform:
   • terraform init
10. Run below command to plan your infrastructure:
    • terraform plan
11. After planning is successful, run the below command to provision the infrastructre: - terraform apply
12. If you want to delete all the provisioned infrastructure run below command:
    • terraform destroy

Note: This terraform configuration saves the terraform state to a remote s3 bucket. Make sure to change the name of bucket in ~/terraform/main.tf file and as well as make sure that you have IAM policy assigned to access the S3/bucket or cross check the bucket policies.

Alternatively if you have installed Make you can run below command in the root folder:

-   make build
Note: Given that you have installed Packer, Terraform and configured the environment keys as well as aws cli.

System Design for whole provisioned infrastructure