Virtualization

A DevOps professional tasked with managing virtualization using technologies like KVM (Kernel-based Virtual Machine) and QEMU (Quick EMUlator) should be adept in several areas to handle the responsibilities that come with it. 

1. Understanding of Virtualization Technology:

• Understand how KVM and QEMU work, their architecture, and functionalities.
• Grasp the principles of virtualization including CPU, memory, disk, and network virtualization.
• Understand the role of hypervisors and the difference between Type 1 and Type 2 hypervisors.

2. Linux System Administration:

• Be adept at configuring Linux systems for optimal performance and security.
• Understand how to effectively manage system resources (CPU, memory, storage, etc.).
• Be skilled in using system monitoring tools to monitor the health of the systems.

3. Networking:

• Manage virtual networks and bridges and understand network interface handling within VMs.
• Ensure the secure configuration of networks and understand VPNs, firewalls, and intrusion detection/prevention systems.
• Be proficient in diagnosing and resolving network issues within the virtualized environment.

4. Storage Management:

• Understand different storage types (e.g., NFS, iSCSI) and manage storage for VMs.
• Implement and manage backup and recovery solutions for virtual environments.
• Optimize storage performance and understand the nuances of storage in a virtualized context.

5. Cluster Management:

• Ensure VMs are configured for high availability and disaster recovery.
• Implement and manage load balancing across virtualized environments.
• Manage and scale resources in accordance to the load and requirements.

6. Troubleshooting:

• Optimize VMs for performance, identify and resolve bottlenecks.
• Quickly identify and resolve issues that arise within the virtualized environment.
• Analyze logs to diagnose issues and understand system operation.