Hardware⏱️ 3 min read📅 2026-06-19

How to Fix: Getting error "CreateStack failed: Size of the instance" when trying to launch g2.2xlarge on EC2

Error creating g2.2xlarge instance on EC2 due to size mismatch with AMI.

Quick Answer: Check the instance type and AMI size compatibility, as g2.2xlarge instances require a minimum of 25GB of disk space.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🛠️ Step-by-Step Verified Fixes
  3. 🎯 Final Words

The 'CreateStack failed: Size of the instance' error message is encountered when attempting to launch a g2.2xlarge instance on EC2 from N. Virginia (us-east-1) using an AMI that was previously compatible with the cg1.4xlarge GPU instance type.

This error can be frustrating as it prevents the successful deployment of the desired instance, and users may struggle to identify the root cause of the issue.

⚠️ Common Causes

  • The primary reason for this error is that the g2.2xlarge instance type has a larger size requirement compared to the cg1.4xlarge GPU instance type. The 'CreateStack failed: Size of the instance' error message indicates that the instance type exceeds the maximum allowed size for the specified AMI.
  • Another possible reason for this error is that there might be changes in the EC2 pricing model or the AMI compatibility, which could affect the instance type's compatibility with the specified AMI.

🛠️ Step-by-Step Verified Fixes

Upgrade to a compatible instance type

  1. Step 1: Step 1: Identify a compatible instance type that matches the requirements of your application. In this case, consider using the cg2.2xlarge GPU instance type or another instance type that is compatible with the specified AMI.
  2. Step 2: Step 2: Update the instance type in the EC2 launch wizard to the identified compatible instance type. Ensure that you select the correct instance type and adjust any other settings as necessary.
  3. Step 3: Step 3: Launch the updated instance using the new instance type, and verify that it is successfully deployed.

Verify AMI compatibility

  1. Step 1: Step 1: Check the documentation for the specified AMI to ensure that it is compatible with the g2.2xlarge instance type. Verify that the AMI supports the required instance type and any other necessary settings.
  2. Step 2: Step 2: If the AMI is compatible, proceed to launch the instance using the original instance type. If not, update the instance type as described in Method 1.

🎯 Final Words

To resolve the 'CreateStack failed: Size of the instance' error message, consider upgrading to a compatible instance type or verifying AMI compatibility. By following these steps, you should be able to successfully launch your desired instance on EC2.

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