Added example json

docs/aws.md

@@ -10,10 +10,42 @@ The next step is to make sure the hostnames in your `inventory` file are identic
 You can now create your cluster!
 
 ### Dynamic Inventory ###
-There is also a dynamic inventory script for AWS that can be used if desired. However, be aware that it makes some certain assumptions about how you'll create your inventory. 
+There is also a dynamic inventory script for AWS that can be used if desired. However, be aware that it makes some certain assumptions about how you'll create your inventory. It also does not handle all use cases and groups that we may use as part of more advanced deployments. Additions welcome.
+
+This will produce an inventory that is passed into Ansible that looks like the following:
+```
+{
+  "_meta": {
+    "hostvars": {
+      "ip-172-31-3-xxx.us-east-2.compute.internal": {
+        "ansible_ssh_host": "172.31.3.xxx"
+      },
+      "ip-172-31-8-xxx.us-east-2.compute.internal": {
+        "ansible_ssh_host": "172.31.8.xxx"
+      }
+    }
+  },
+  "etcd": [
+    "ip-172-31-3-xxx.us-east-2.compute.internal"
+  ],
+  "k8s-cluster": {
+    "children": [
+      "kube-master",
+      "kube-node"
+    ]
+  },
+  "kube-master": [
+    "ip-172-31-3-xxx.us-east-2.compute.internal"
+  ],
+  "kube-node": [
+    "ip-172-31-8-xxx.us-east-2.compute.internal"
+  ]
+}
+```
+
 Guide:
 - Create instances in AWS as needed.
-- Add tags to the instances with a key of `kargo-role` and a value of `kube-master`, `etcd`, or `kube-node`. You can also share roles like `kube-master, etcd`
+- Either during or after creation, add tags to the instances with a key of `kargo-role` and a value of `kube-master`, `etcd`, or `kube-node`. You can also share roles like `kube-master, etcd`
 - Copy the `kargo-aws-inventory.py` script from `kargo/contrib/aws_inventory` to the `kargo/inventory` directory.
 - Set the following AWS credentials and info as environment variables in your terminal:
 ```
@@ -21,4 +53,4 @@ export AWS_ACCESS_KEY_ID="xxxxx"
 export AWS_SECRET_ACCESS_KEY="yyyyy"
 export REGION="us-east-2"
 ```
-- We will now create our cluster. There will be either one or two small changes. The first is that we will specify `-i inventory/kargo-aws-inventory.py` as our inventory script. The other is conditional. If your AWS instances are public facing, you can set the VPC_VISIBILITY variable to public and that will result in public IP and DNS names being passed into the inventory. This causes your cluster.yml command to look like `VPC_VISIBILITY="public" ansible-playbook ... cluster.yml`
+- We will now create our cluster. There will be either one or two small changes. The first is that we will specify `-i inventory/kargo-aws-inventory.py` as our inventory script. The other is conditional. If your AWS instances are public facing, you can set the `VPC_VISIBILITY` variable to `public` and that will result in public IP and DNS names being passed into the inventory. This causes your cluster.yml command to look like `VPC_VISIBILITY="public" ansible-playbook ... cluster.yml`