Document dev environment.

README.md

@@ -1,19 +1,53 @@
-A Terraform script to create k8s nodes. This script has modules for creating the
+A terraform script that will setup VMs via AWS or KVM/QEMU (libvirt).
-nodes on a KVM/QEMU (libvirt) hypervisor or creating the nodes via AWS.
 
 The modules allow you create N VMs of a specific type. So you could create 1
 master node and 3 worker nodes or you could create 3 Ubuntu VMs and 5 CentOS
 VMs, or whatever fits your needs.
 
+This script creates the VMs and then uses Cloud-init for initial configuration
+of the VMs.
+
+libvirt vs. AWS
+----------------------------------------
+
+This script allows VMs to be created libvirt or AWS. You can choose either one,
+however, running both at the same time has not been tested. Therefore, when
+using one, you should comment out all code pertaining to the other provider.
+
 Cloud-Init
 ----------------------------------------
 
 Both the libvirt and aws modules use cloud-init for initial configuration of the
-VMs.
+VMs. Cloud-init is used to create the admin user and add the mss-admin keys.
+Cloud-init is also used to install some initial packages. The goal is to get
+these VMs setup enough so that they can be configured via Ansible.
+
+Environment Setup
+----------------------------------------
+
+1. From within the nodes-terraform directory run `terraform init`. You will a
+   see bunch if output as terraform grabs the dependencies it needs.
+
+2. Copy the shared `terraform.tfvars` from S3.
+   ```shell
+   aws s3 cp s3://mss-terraform-state/global/s3/terraform.tfvars .
+   ```
+   For instructions on getting AWS CLI to work correctly see `aws-api-setup.md`
+   in the `doc-ops` repo.
+
+   Take care to copy your `terraform.tfvars` back to the S3 bucket whenever you
+   make a change to it.
+
+3. Verify that you branch and variables match whats deployed by running
+   `terraform plan`. If everything is in sync you should see `No changes. Your
+   infrastructure matches the configuration.` _IF_ you do not see this message
+   make sure to sync with the other admins before continuing.
+
 
 Dependencies
 ----------------------------------------
 
+_UNFINISHED_
 TODO REM add libvirt provider
 libvirt provider depends on mkisofs