Update for issue #15

Author: npalm

README.md

@@ -29,6 +29,22 @@ export AWS_ACCESS_KEY_ID=...
 export AWS_SECRET_ACCESS_KEY=...
 ```
 
+### Service linked roles
+Currently the ec2 instance role does not allow creation of service linked roles. The runner instances is depended on the following two service linked roles:
+- AWSServiceRoleForAutoScaling
+- AWSServiceRoleForEC2Spot
+
+You can create them manually or via terraform.
+
+```
+resource "aws_iam_service_linked_role" "spot" {
+  aws_service_name = "spot.amazonaws.com"
+}
+
+resource "aws_iam_service_linked_role" "autoscaling" {
+  aws_service_name = "autoscaling.amazonaws.com"
+}
+```
 
 ### Configuration GitLab runner token
 Currently register a new runner is a manual process. See the GitLab Runner [documentation](https://docs.gitlab.com/runner/register/index.html#docker) for more details.