Attach the EC2 role to all EC2 instances

1. Search and click on EC2 from AWS navigation menu.
2. In the left navigation pane, click on Instances under Instances drop down menu.
3. Click on a running instance, click Actions drop down menu > Instance Settings > Attach/Replace IAM role.

   

4. Click on the IAM role drop down menu, and select the EC2 role created earlier.
5. Click Apply to finish attaching the EC2 role.
6. Repeat steps 3-5 above to attach the EC2 role to the rest of the running EC2 instances.