EBS snapshot failures.

EBS snapshot failures can occur due to various reasons. Addressing these issues promptly is crucial for data protection and disaster recovery. Here are common causes and steps to address EBS snapshot failures:

1. Insufficient Permissions:
   • Cause: The IAM user or role attempting to create the snapshot lacks the necessary permissions (ec2:CreateSnapshot and ec2:CreateTags).
   • Solution:
     • Verify that the IAM entity has the required permissions and update the policy if necessary.
2. Insufficient Disk Space:
   • Cause: There may not be enough free space on the EBS volume to create a snapshot.
   • Solution:
     • Ensure there is enough free space on the volume or consider resizing the volume if needed.
3. Resource Limit Exceeded:
   • Cause: You may have reached the limit for the number of snapshots in your AWS account or the limit for the number of snapshots per volume.
   • Solution:
     • Request a limit increase from AWS Support or consider cleaning up old or unused snapshots.
4. EBS Volume in the Wrong State:
   • Cause: The EBS volume might be in a state that prevents snapshots, such as being detached or in an error state.
   • Solution:
     • Ensure that the EBS volume is in a healthy state and attached to a running EC2 instance.
5. Rate Limit Exceeded:
   • Cause: You may be attempting to create snapshots too quickly, exceeding AWS API rate limits.
   • Solution:
     • Slow down the rate at which you're creating snapshots, or contact AWS Support for a rate limit increase.
6. Network Connectivity Issues:
   • Cause: If there are network issues between your EC2 instance and the EBS service, it can prevent snapshot creation.
   • Solution:
     • Check your VPC, subnet, security groups, and route table configurations to ensure proper network connectivity.
7. Invalid Parameters:
   • Cause: Incorrect or invalid parameters were provided when trying to create the snapshot.
   • Solution:
     • Double-check the parameters provided in the snapshot creation command or script.
8. Insufficient IAM Role Permissions:
   • Cause: If you're trying to create a snapshot using an EC2 instance with an associated IAM role, ensure that the role has the necessary permissions for snapshot creation.
   • Solution:
     • Check the IAM role policy associated with the EC2 instance and ensure it includes the required permissions.
9. EBS Volume Encryption:
   • Cause: If the EBS volume is encrypted, ensure that the KMS key policy allows the necessary actions for snapshot creation.
   • Solution:
     • Review and adjust the KMS key policy if needed.
10. Service Outage or Issues:
    • Cause: AWS service issues can sometimes lead to snapshot failures.
    • Solution:
      • Monitor the AWS Service Health Dashboard for any reported issues.

Remember to monitor your snapshots, set up automated backup schedules, and regularly test your backups to ensure they can be successfully restored in case of a failure.