1Z0-1123-25 Question 57
Single answerYou are migrating several critical AWS EC2 instances running custom Linux AMIs to Oracle Cloud Infrastructure (OCI). The instances have important application data on their boot volumes, and you must preserve the OS configuration and installed software. Which approach provides a reliable way to migrate these EC2 instances to OCI with minimal changes?
- A
Create new OCI instances using the same Linux distribution from OCI Marketplace and reinstall all applications manually.
- B
Perform a block-level copy of each running EC2 instance directly into OCI� Block Volume service without shutting down the instance.
- C
Export each EC2 instance as an image (e.g., VMDK or OVA), upload it to OCI Object Storage, and then import it as a custom image to launch new instances in OCI.
- D
Stop each EC2 instance and recreate the machine images in OCI by copying the EC2 root file system over SSH to a live OCI instance.
Show answer and explanation
Correct answer: C
Explanation
The recommended method for migrating AWS EC2 instances to Oracle Cloud Infrastructure is to export the EC2 instances in a supported image format and then import them as custom images in OCI. This process captures the entire OS, application stack, and data, reducing manual reconfiguration. Refer to the official Oracle documentation on 'Importing Custom Images from Third-Party Clouds' for a detailed, step-by-step procedure.
- A. Incorrect.
Option 1: Incorrect. While you can spin up new OCI instances from a base image, you would need to manually recreate all configurations and reinstall applications. This can be time-consuming and prone to errors, especially for complex workloads.
- B. Incorrect.
Option 2: Incorrect. There is no native feature allowing a block-level copy of a running Amazon EC2 instance directly into OCI Block Volume. You typically must export the image or snapshot and then import it to OCI.
- C. Correct.
Option 3: Correct. Exporting the EC2 image (in a supported format like OVA or VMDK), uploading it to OCI Object Storage, and then importing it as a custom image preserves the operating system, installed packages, and configurations in one process.
- D. Incorrect.
Option 4: Incorrect. Manually copying the root file system via SSH to a live OCI instance is error-prone, does not guarantee a consistent filesystem state, and can lead to data corruption or missing configurations.