1Z0-1123-25 Question 90
Select 2You are tasked with migrating a customer-facing microservices application running on containerized Docker hosts in an on-premises environment to Oracle Cloud Infrastructure (OCI). The goal is to minimize downtime and ensure a smooth cutover to OCI Container Engine for Kubernetes (OKE). Which two actions should you take to accomplish this with minimal service interruption?
- A
Build your container images locally, push them to Oracle Container Registry (OCIR), and perform rolling or canary deployments in OKE to gracefully shift traffic from on-premises to OCI.
- B
Shut down all on-prem Docker hosts immediately, re-build your images directly within the OKE nodes, and restart the containers manually for a clean environment.
- C
Implement an Oracle DevOps CI/CD pipeline to automate building and testing container images, push them to OCIR, and deploy to OKE using rolling updates for minimal downtime.
- D
Copy the Docker runtime files from on-premises hosts directly onto your OKE worker nodes via SSH, bypassing container registry usage to speed up the migration.
Show answer and explanation
Correct answers: A, C
Explanation
To minimize downtime when migrating containerized applications to OCI, you should adopt a safe, incremental approach. Oracle recommends pushing container images to Oracle Container Registry (OCIR) and leveraging rolling or canary deployments in OKE so that users experience minimal disruption. Oracle DevOps CI/CD pipeline can automate the build, test, and deployment process. Refer to the official OCI Container Engine for Kubernetes documentation for comprehensive guidance on using OCIR, rolling deployments, and best practices for container migration.
- A. Correct.
Correct. Building container images locally and pushing them to OCIR is a standard best practice. Rolling or canary deployments in OKE allow you to gradually shift traffic to the new pods, minimizing disruptions as you migrate from on-premises to OCI.
- B. Incorrect.
Incorrect. Shutting down all on-prem Docker hosts immediately could cause unnecessary downtime. Additionally, re-building images directly on OKE nodes without using a registry increases complexity and risk of misconfiguration.
- C. Correct.
Correct. Using Oracle DevOps to automate building and testing ensures consistent, repeatable deployments. Pushing built images to OCIR and deploying with a rolling update strategy ensures minimal downtime by updating clusters incrementally.
- D. Incorrect.
Incorrect. Manually copying runtime files to OKE nodes bypasses OCI� built-in container registry capabilities and can lead to version mismatches and complex troubleshooting. Using OCIR streamlines image distribution, security, and lifecycle management.