1Z0-1109-25 Oracle Cloud Infrastructure 2025 DevOps Professional Practice Questions

This approach addresses all requirements comprehensively. OCI Resource Manager with Terraform provides a declarative, version-controllable method for provisioning the entire infrastructure (VCN, OKE clusters, etc.), ensuring consistency and repeatability. Helm charts are the industry standard for packaging and managing Kubernetes applications, allowing for templating, versioning, and dependency management. Integrating Helm deployments into an OCI DevOps pipeline automates the application lifecycle on the provisioned infrastructure, creating a full-stack, declarative solution.

OCI Bastion is a fully managed service that provides secure access to private resources. For accessing a private Kubernetes API endpoint, the 'Port Forwarding' session type is ideal. It creates a secure tunnel from the developer's local machine to the Bastion service, which then forwards the connection to the specified private IP and port of the OKE API endpoint. This allows the developer to configure their kubeconfig to point to localhost on the forwarded port, enabling kubectl commands to work seamlessly and securely without exposing the cluster.

The OCI DevOps service has a specific artifact type named 'Kubernetes manifest'. This type is designed to point to a YAML file or a directory of YAML files (packaged as a .zip or .tar.gz) stored in the OCI Artifact Registry. When configuring a 'Deploy to OKE' stage in a deployment pipeline, you select an artifact of this type, and the pipeline will use its contents to execute a kubectl apply against the target cluster.

OCI Managed Build runners execute commands within a specific working directory, typically /workspace/ . The non-root user running the build has write permissions within this directory. A 'permission denied' error during file operations strongly suggests the script is trying to write to a system-level directory (e.g., /tmp, /opt) where the user does not have the necessary permissions. The solution is to ensure all temporary files and build outputs are written to paths relative to the working directory.

OCI DevOps Code Repositories have a built-in 'Mirroring' feature that allows them to automatically sync with an external Git repository, such as one on GitHub or Bitbucket. By configuring the OCI repository as a mirror of the GitHub repository, any commits pushed to the source (GitHub) will be automatically fetched and updated in the OCI mirror, enabling the use of OCI-native CI/CD triggers and workflows.

The 'Drift Detection' feature in OCI Resource Manager is specifically designed for this purpose. It compares the current state of the resources defined in the stack's Terraform configuration with the actual deployed resources in OCI. It then generates a report detailing any discrepancies (or 'drift'), such as the manual change made to the network security group via the console. This allows teams to identify and remediate out-of-band changes to maintain the integrity of their Infrastructure as Code.

This combination provides a complete solution.

1. Taints are applied to the GPU nodes (e.g., gpu=true:NoSchedule). This prevents any pod without a matching toleration from being scheduled there.
2. Tolerations are added to the video processing pods, allowing them to be scheduled on the tainted GPU nodes.
3. Node Selector or Node Affinity is added to the video processing pods to explicitly request scheduling on nodes with a specific label (e.g., a label indicating they have a GPU). This ensures they are not just allowed on GPU nodes but are actively scheduled there. This two-part mechanism both reserves the specialized nodes and directs the appropriate workloads to them.

The OCI DevOps Deployment Pipeline includes a dedicated 'Traffic Shift' stage for managing blue-green and canary deployments on OKE. This stage is the most effective and automated method as it natively handles the controlled redirection of traffic between backend sets (representing the blue and green deployments) associated with a Kubernetes Service of type LoadBalancer. It provides fine-grained control and integrates seamlessly with validation and rollback stages. Using shell scripts or CLI commands introduces manual scripting overhead and is less robust than the purpose-built stage. Redeploying the service manifest is a valid but less controlled approach compared to the Traffic Shift stage.

OCI Service Mesh provides deep observability into traffic between microservices. It automatically collects metrics, logs, and distributed traces, allowing teams to monitor and debug communication without instrumenting the application code itself.

A core feature of OCI Service Mesh is enhancing security by automatically encrypting all traffic between services within the mesh using mutual TLS (mTLS). This enforces a zero-trust security model at the network layer.

For secure access to on-premises resources, the correct approach is to use a private build runner. This runner, hosted on an OCI compute instance within your VCN, can leverage the existing FastConnect circuit. By placing it in a private subnet with appropriate route table entries pointing to the DRG, it can communicate directly and securely with the on-premises Maven repository without any public internet exposure. Oracle-managed runners operate outside your VCN and cannot access private on-premises endpoints.