Overview

This contains HashiCorp code to do the following:

1. Packer template to build an Ubuntu 18.04 image consisting of 'HashiStack', which is Consul, Nomad and Vault
2. Terraform code to provision the HashiStack in 2-3 separate AWS regions with peering
3. Automated cluster formation of Consul and Nomad in each region
4. Automated cluster formation of Vault in each region
5. Automated WAN joining of Consul and Nomad
6. Automated replication configuration of Vault clusters in each region

Assumptions

• Packer and Terraform are available on local machine
• Vault Enterprise linux binary available locally (Consul Enterprise and Nomad Enterpise are optional)
• User possesses AWS account and credentials

Packer Usage

1. Download Consul, Nomad, and Vault binaries locally (Vault enterprise required, Consul and Nomad Enterprise )
2. Copy packer/vars.json.example to packer/vars.json
3. Configure variables local path to those binaries in packer/vars.json
4. Ensure AWS credentials are exposed as environment variables
5. Expose AWS environment variables to avoid AMI copy timeouts. export AWS_MAX_ATTEMPTS=60 && export AWS_POLL_DELAY_SECONDS=60
6. Execute Packer build

cd packer
# CentOS 7(default)
packer build -var-file=vars.json -only=amazon-ebs-centos-7 packer.json   
# RHEL 7.5 - Additional licensing costs
packer build -var-file=vars.json -only=amazon-ebs-rhel-7.5-systemd packer.json   

Terraform usage

Configure Terraform variables

cp terraform.tfvars.example terraform.tfvars
# edit terraform.tfvars

Initialize Terraform

cd terraform
terraform init

Terraform plan execution with summary of changes

terraform plan

Terraform apply to create infrastructure

terraform apply 

# apply execution without prompt
# terraform apply -auto-approve

Tear down infrastructure using Terraform destroy

terraform destroy -force