10 Virtualization Technology Interview Questions and Answers for devops engineers

flat art illustration of a devops engineer

1. What virtualization technologies are you proficient with?

As an experienced virtualization engineer, I am proficient with a variety of virtualization technologies. Some of the most notable ones are:

  1. VMware vSphere - I have an excellent understanding of how to manage large scale infrastructures with vSphere. A specific example of my proficiency was when I worked with a company where I reduced their hardware costs by 50% by combining their workload on fewer servers utilizing VMware vSphere technology.
  2. Microsoft Hyper-V - I have strong expertise in Microsoft Hyper-V. In my previous role, I designed several Hyper-V infrastructures with System Center Virtual Machine Manager, created automated workflows using PowerShell, which saved the team more than 15 hours per week.
  3. OpenStack - I have experience in building and managing cloud environments using OpenStack. At my previous company, I migrated 100% of our production workload to OpenStack infrastructure, which resulted in significant cost reduction and an increase in overall performance by 25%.
  4. Docker - As a containerisation technology, I have experience managing Docker with Docker Swarm & Kubernetes for container orchestration. In my previous role, I led a migration to a micro-services architecture and I Dockerized more than 20% of their production workload, which resulted in a 30% decrease in infrastructure costs, better release cadence and improved application uptime.

In summary, I am an experienced virtualization engineer who is proficient in a variety of virtualization technologies and have demonstrated tangible results in cost reduction, increased performance and automation.

2. What advantages do you see in virtualization technology over traditional approaches?

Virtualization technology presents numerous advantages when compared with traditional approaches for many reasons, including:

  1. Cost savings: Virtualization technology reduces the need for physical hardware, which in turn reduces operational expenses associated with the hardware's maintenance, power, cooling, storage, backup, and replacement.
  2. Scalability: Virtualization technology enables scaling up or down of IT environments with ease, as needed. It also allows for rapid deployment of new applications and services without the usual complex provisioning and setup.
  3. Flexibility: Virtualization technology enables the creation of several virtual machines from a single physical machine, allowing for more tasks to be carried out concurrently on the same hardware. Additionally, virtual machines can be moved across different hardware, data centers, or cloud providers with ease, creating endless possibilities for flexibility.
  4. Improved disaster recovery: Virtualization technology creates an image of the entire server or application, which can be easily backed up, cloned or restored, thus enhancing disaster recovery and ensuring business continuity in the event of data loss. Several virtual machines can also be placed on a single physical machine, creating a redundancy of resources which contributes to disaster recovery.
  5. Increased security: Virtualization technology allows for the creation of a sandbox for apps or services that may be suspicious of other software or malware, without risking contamination of other systems. Additionally, virtual machines can be isolated from host machines, reducing the potential for malware attacks on the host system.

Overall, adopting virtualization technology presents several benefits for businesses and organizations of different types and sizes, ranging from cost savings to increased security, scalability, flexibility, and improved disaster recovery, making it an ideal approach for modern IT infrastructure.

3. How do you manage resource allocation in virtualized environments?

At my previous job, I managed resource allocation in virtualized environments by leveraging a Resource Pooling system. This allowed me to control the allocation of resources such as CPU, memory, and storage among different Virtual Machines (VMs). By creating Resource Pools, I could pool together resources from different physical hosts and allocate those resources to specific VMs as required.

I monitored resource usage of each individual VM through performance charts in vSphere, our virtualization management platform. This helped me identify which VMs were consuming too many resources and which were being underutilized. Based on this data, I could adjust the static allocation of resources within the Resource Pools to ensure they were being utilized optimally.

I also implemented an Elastic Resource Pool, which allowed for dynamic allocation of resources based on workload demands. This meant that resources could be automatically adjusted based on the demands of the VMs within the Resource Pool, ensuring that none of our VMs were starved of resources and VMs with heavy workloads were given the necessary resources to perform optimally

As a result of these resource allocation strategies, we saw a significant improvement in performance, with a 15% increase in productivity across our organization. Our systems were also more stable, with fewer incidents of downtime or application errors due to resource constraints.

  1. Implemented Resource Pools to control allocation of resources between Virtual Machines
  2. Monitored resource usage of individual VMs through performance charts in vSphere
  3. Adjusted resource allocations within Resource Pools to ensure optimal utilization
  4. Implemented Elastic Resource Pool for automatic dynamic allocation of resources based on workload demands
  5. 15% increase in productivity across organization
  6. Less downtime and application errors

4. How do you ensure high availability in a virtualized infrastructure?

Ensuring high availability in a virtualized infrastructure is crucial for maintaining business continuity. To achieve this, I make use of various techniques such as:

  1. Redundant hardware: I deploy virtual machines across multiple physical servers to ensure that in case of a failure, the workload can be seamlessly migrated to another server.
  2. Load balancing: I use load balancing tools to distribute workloads evenly across multiple servers. This helps in preventing any single point of failure and ensures that the virtualized infrastructure can handle high traffic.
  3. Automated failover: I set up automated failover mechanisms to ensure that if a physical server goes down, the virtual machine workloads can be instantly moved to another physical server without any disruption to end-users.
  4. Virtual machine replication: I regularly replicate virtual machines across multiple physical servers to ensure that in case of a hardware failure, the replicated virtual machine can take over without any loss of data.
  5. Regular backups: I ensure that regular backups of virtual machines and their associated data are taken to avoid any data loss in case of a system failure.

Implementing the above techniques has resulted in a highly available virtualized infrastructure. In my previous role, the virtualized environment had an uptime of over 99.9%, leading to a highly satisfied end-user community, increased business productivity and fewer support requests.

5. What strategies do you prefer to monitor and manage virtual machines?

My preferred strategy for monitoring and managing virtual machines involve a combination of tools such as Nagios, SolarWinds Virtualization Manager, and VMware's vRealize Operations.

  1. Nagios: I use Nagios for monitoring the virtual infrastructure's performance and availability, along with various metrics such as CPU utilization, memory usage, network bandwidth, and storage utilization. During my past experience using Nagios, I was able to monitor over 1000 virtual machines running in a large data center, ensuring that any performance or availability issues were quickly identified and resolved.
  2. SolarWinds Virtualization Manager: SolarWinds Virtualization Manager provides me with critical insights into the virtual environment's performance, growth, capacity planning, and cost optimization. By utilizing SolarWinds, I have been able to optimize the virtual infrastructure to ensure that it operates efficiently and cost-effectively.
  3. VMware's vRealize Operations: vRealize Operations helps me to maximize the efficiency and performance of my virtual machines by identifying and resolving any performance issues. Furthermore, it helps me to enhance the VM's configuration and capacity management, reducing the risk of downtime and increasing business continuity.

By combining these monitoring and management tools, I have been able to optimize virtual infrastructure performance, ensure high availability, and optimize cost savings. As an example, across multiple clients in 2022, I was able to reduce the virtual machine problem resolutions by 60% and increase uptime by 25%. The combination of these tools and strategies enabled me to provide reliable and high performing virtual environments, which resulted in increased employee productivity and smoother business operations for my clients.

6. Can you explain your experience with cloud virtualization platforms?

Throughout my career, I have gained extensive experience in working with different cloud virtualization platforms. My expertise includes working with both public and private clouds, such as AWS, Azure, VMware, and OpenStack.

  1. At my previous company, I led the migration of their on-premises infrastructure to AWS. I was responsible for designing and implementing the architecture that would allow the company to move to the cloud smoothly. As a result, downtime decreased by 75% and overall infrastructure costs dropped by 60%.
  2. In another project, I was responsible for implementing a highly available architecture using VMware vSphere. I designed virtual machines that would automatically fail-over in case of downtime, and by implementing this system, I was able to achieve a 99.99% uptime for the system.
  3. Using Azure, I collaborated with a team of developers to create virtual machines that would allow the testing and deployment of new code without affecting the production environment. This resulted in a 50% increase in developer productivity, and it allowed the company to launch new products faster than ever before.
  4. Additionally, I have been working with OpenStack to implement private cloud solutions for clients. Using OpenStack, I have created a scalable infrastructure that allows for easy cloning of virtual machines and automatic scaling based on demand.

Overall, my experience with cloud virtualization platforms has allowed me to gain a deep understanding of the intricacies involved in implementing a virtualized infrastructure. My goal is to continue improving my skills in virtualization technology and contribute to projects that require expertise in this area.

7. How have you handled storage and network issues within a virtualized environment?

Throughout my experience as a virtualization technology expert, I have encountered numerous storage and network issues across various virtualized environments. One of the most crucial steps to mitigating these issues is to perform an in-depth diagnosis of the root cause. I have found that this approach helps me to identify the specific issue causing the problem and the appropriate corrective measures.

In one instance, I was working with a client whose virtual environment had a network congestion issue, which was causing slow network connectivity. To fix this, I conducted an analysis and found out that the network wasn't optimized for the amount of traffic it was receiving. After evaluating the network infrastructure, I discovered that some of the network protocols were outdated, and the hardware wasn't compatible with the latest network requirements. I addressed the issue by upgrading the outdated protocols and replacing the hardware, which in turn improved the network traffic by over 30%.

Another instance of handling storage issue was when working with a healthcare organization that had a virtualized environment with issues regarding storage capacity. I conducted an analysis and discovered that the organization had not properly managed their storage capacity, and some of their data was outdated, causing storage inefficiencies. By working with their IT team, we implemented a storage management strategy and cleared out outdated data, which restored ample storage capacity and increased the performance of the virtualized environment by over 70%.

By diagnosing the root cause, implementing a corrective measure, and managing the virtualized environment, I have had various breakthroughs across different organizations and industries to ensure that their virtualized environments are highly efficient and capable of delivering optimal performance.

8. How do you design disaster recovery and backup solutions for virtual machines in your environment?

Designing disaster recovery and backup solutions for virtual machines is imperative to ensure business continuity. In my previous role as a virtualization engineer, I designed a disaster recovery plan that consisted of both local and off-site backups.

  1. Local backups:

    • We utilized snapshotting technology at the hypervisor level to take daily backups of all virtual machines.
    • These backups were then replicated to a secondary storage array in a separate data center.
    • We also had a backup appliance on-site that took incremental backups every hour and created a ready-to-boot virtual machine image.
  2. Off-site backups:

    • We used a cloud backup service that replicated our backups off-site in real-time.
    • This allowed us to quickly restore virtual machines on cloud infrastructure in the event of a disaster.
  3. Disaster recovery testing:

    • We conducted regular disaster recovery testing to ensure the integrity and effectiveness of our backups.
    • During these tests, we identified and resolved potential issues before they could cause a disruption.

As a result of these measures, we were able to recover from a severe storage array failure within four hours, with minimal data loss. Our disaster recovery plan had a 100% success rate during all tested scenarios, proving the effectiveness of our backup solution.

9. What security considerations do you make for virtualized environments?

When it comes to virtualized environments, security is of utmost importance. Here are some security considerations I make:

  1. Securing the virtualization host server: This is the first line of defense against attacks. I ensure that the host server is protected with robust antivirus software and firewalls.

  2. Implementing strong authentication mechanisms: I ensure that all virtualization-related authentication mechanisms, such as passwords, are strong and changed regularly. I also implement two-factor authentication wherever possible.

  3. Encrypting sensitive data: I ensure that all sensitive data, such as customer information or financial records, are always encrypted both at rest and in-transit. This way, even if an attacker gains access to the data, they won't be able to read or use it.

  4. Isolating virtual machines: I make sure that each virtual machine has its own isolated space, which is protected from other machines. This ensures that, even if one machine is compromised, it won't affect the others.

  5. Monitoring for threats: I use advanced monitoring tools to detect threats in real-time. This allows me to take immediate action before an attack can do any damage.

Using these security measures, I helped my previous employer reduce security incidents in their virtualization environment by 30% over the course of one year.

10. Can you discuss a particularly challenging issue you faced in a virtualized environment, and how you resolved it?

During my time working in a virtualized environment, I faced a particularly challenging issue involving a company's database server. The server was experiencing slow response times, which was affecting the productivity of the entire team. After investigating the issue, I found that the virtual machine was competing for resources with other virtual machines running on the same physical server.

To resolve the problem, I first communicated with the team to ensure that the server was being utilized efficiently. I then determined which virtual machines were consuming the majority of the resources and analyzed their resource needs. Based on this analysis, I carried out some resource allocation modifications, assigning more RAM and CPUs to the database server virtual machine.

After several tests, the server response time improved by up to 50% and the team was able to work efficiently without any lag in network performance. This experience taught me the importance of benchmarking and optimizing virtual machines based on current workload demand.


If you are aiming to pursue a career in virtualization technology and have just read our interview questions and answers, you are ready to take the next step. Writing a cover letter may be a daunting task, but it is the gateway to land your dream job in virtualization technology. To help you out, we've created a guide on writing an impressive cover letter–one that will surely make you stand out from the crowd. Another important step in your job search is to have an impressive CV. Impress potential employers with our guide on writing a great CV for DevOps Engineers. Finally, if you are on the lookout for a remote devops engineering job, our website has you covered. With our job board for remote devops engineer jobs, you can browse through a wide range of openings from top-tier companies worldwide. We wish you the best in your virtualization technology job search!

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