MattSurabian · March 29, 2016 13:24 · Mar 29, 2016
diff --git a/aws-tags-with-ansible-and-terraform.md b/aws-tags-with-ansible-and-terraform.md
@@ -0,0 +1,52 @@
+
+### Setting Tags in Terraform
+Determine some sensible tags to pass non-critical information to Ansible or other CM solutions:
+
+```
+resource "aws_instance" "main" {
+...
+  tags {
+  ...
+    "some_tag" = "waka"
+  }
+}
+```
+
+### Limiting Playbooks via AWS Tags
+Make sure the dynamic inventory config file (`ec2.ini`) has at least the `group_by_tag_keys` option commented out
+
+```
+...
+# The EC2 inventory output can become very large. To manage its size,
+# configure which groups should be created.
+# group_by_key_pair = True
+group_by_tag_keys = True
+```
+
+**At command runtime:**
+```
+ansible-playbook ... --limit tag_some_tag_Waka
+```
+
+
+**In the playbook:**
+```
+- hosts: tag_some_tag_Waka
+```
+
+### Using EC2 Facts in a playbook with dynamic inventory
+
+```
+{{ec2_tag_some_tag}}
+```
+
+### Using "EC2 Facts" in a playbook without dynamic inventory
+For this to work the instance must have the AWS CLI installed and have an IAM role assigned with the necessary permissions.
+
+```
+    - name: get instance tags
+      shell: aws ec2 describe-tags --filters="Name=resource-id,Values=$(ec2metadata --instance-id)"
+      environment:
+        AWS_DEFAULT_REGION: us-east-1
+      register: instance_data
+```