packer_ansible_terraform_goss

This repository is an example of packer + ansible + terraform + goss.

It's using Goss tool to do some unit tests on services running, like iptables and ssh

Ansible instals the iptables and configure it to being accessible on port 22.

Terraform uses the custom AMI created by searching for it using aws_ami resource. It's creating also the key pair to access the instance.

When terraform finishes to create the resources it prints out the NLB domain that can be used to access the instance.

The final architecture is an NLB in front with an instance in private subnet running in an autoscalig group.

Structure

1. ansible
   1. bastion.yaml - ansible code to configure the AMI, install iptables and configure it and reconfigure the ssh with some basic security statements.
   2. goss.yaml - goss checks to be performed in the instance on build time.
2. scripts
   1. bootstrap.sh - botstrap script to instanle ansible. It should have a minimal set of commands as the responsible fo the job should be the ansible.
3. terraform
   1. I wont describe all files as I think they are self explanatory and I tried to have a minimal separation by terraform resources(maybe too much separation for this small case).
4. packer-build.json - packer definition to build the AMI

How to use

1. If you have aws_access_key and aws_secret_key please change them in packer-build.json file accordingly. If you're using some sort of autoconfigured environment with roles then don't need to specify them.
2. Change region (aws region) accordingly in packer-build.json
3. vpc_id and subnet_id are temporary resources to build the AMI. Change them with your own ID's. I recommend to use public subnet for this step.
4. Execute packer build -machine-readable packer-build.json
5. cd ./terraform
6. vpc_id, public_subnet_id and private_subnet_id from vars.tf change to your existing VPC and the subnet ID should be private as this is a bastion server with NLB in front
7. terraform init
8. terraform plan
9. terraform apply
10. The terraform will create a local key file named example.pem to access the bastion.
11. In the end of terraform apply it will output the DNS name of NLB that was assigned to the instance and to access it execute this:
    1. ssh <DNS_NAME> -l ec2-user -i example.pem