AWS SysOps Associate (SOA-C02) Review Material – EC2

Changing Instance Type
1. Stop the instance
2. Change the instance type
3. Start the instance
Troubleshooting
- #InstanceLimitExceeded
  - Max number of VCPU exceeded in a region
  - Resolution:
    - Request AWS to increase the limit or launch in another region
  - The limit only applies to On-Demand and Spot instances
- #InsufficientInstanceCapacity
  - AWS does not have enough capacity for on-Demand in a particular AZ
  - Resolution:
    - Ask for a different(smaller) instance type
    - Launch in another region
    - Wait for a few minutes to see if AWS will have enough capacity
- #Instance Terminates Immediately
  - Reach EBS limit
  - EBS is corrupted
  - EBS is encrypted but no access to the KMS key
  - AMI used is missing a part
  - Resolution:
    - Check the EC2 console for the reason.