Instance Limit Exceeded
- Instance Limit Exceeded error comes if launching a new instance or restarting a stopped instance.
- It is shown if reached the limit on the number of instances that you can launch in a region.
- Request an instance limit increase on a per-region basis.
Insufficient Instance Capacity
- InsufficientInstanceCapacity error comes if launching a new instance or restarting a stopped instance.
- AWS does not currently have enough available On-Demand capacity to service the request.
- Resolve by - Resubmit after waiting a few minutes
 - Submit request with a reduced number of instances.
 - submit a new request without specifying an Availability Zone.
 - submit a new request using a different instance type
 - Try creating an On-Demand Capacity Reservation,
 - Try purchasing Reserved Instances
 
Instance Terminates Immediately –
- Your instance goes from the pending state to the terminated state immediately after restarting it.
- Reasons - Reached EBS volume limit.
 - An EBS snapshot is corrupt.
 - The root EBS volume is encrypted and do not have permissions to access the KMS key for decryption.
 
- Solution – use the Amazon EC2 console as - Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
 - In the navigation pane, choose Instances, and select the instance.
 - In the Description tab, note the reason next to the State transition reason label.
 
