OpenVZ explained

OpenVZ: A Secure Virtualization Solution for InfoSec

4 min read ยท Dec. 6, 2023
Table of contents

Virtualization technology has revolutionized the way we utilize computing resources, enabling efficient resource allocation, improved scalability, and enhanced security. In the realm of InfoSec and cybersecurity, OpenVZ stands as a powerful open-source virtualization solution that offers robust isolation capabilities and flexibility. In this article, we will explore OpenVZ in detail, delving into its origins, features, use cases, and its relevance in the industry.

What is OpenVZ?

OpenVZ is an operating system-level virtualization solution that allows multiple virtual environments, known as containers, to run on a single physical host. Unlike traditional hypervisor-based virtualization, OpenVZ operates at the operating system (OS) level, sharing the host's kernel between containers. Each container is isolated and operates as an independent entity, providing a lightweight and efficient virtualization mechanism.

Origins and History

OpenVZ traces its roots back to the Virtuozzo virtualization technology developed by Parallels. Virtuozzo was initially released in 2001 as a commercial virtualization platform. In 2005, Parallels released an open-source version of Virtuozzo, known as OpenVZ, under the GNU General Public License (GPL). This move allowed the community to contribute to its development and fostered widespread adoption.

How OpenVZ Works

OpenVZ utilizes the Linux kernel's functionality, specifically the concept of namespaces and control groups (cgroups), to provide containerization. Namespaces isolate various resources, such as process IDS, network interfaces, and mount points, ensuring each container operates in its own virtual environment. On the other hand, cgroups enable resource management by limiting CPU, memory, disk, and network usage for each container.

The OpenVZ kernel patch implements these features, allowing the creation and management of containers. Each container shares the same kernel as the host but runs its own instance of the user space, including applications, libraries, and configuration files. This approach significantly reduces overhead, as there is no need for separate OS installations for each container.

Features and Benefits

1. Resource Efficiency:

OpenVZ minimizes resource duplication by sharing the host's kernel among containers. This approach results in a lightweight virtualization solution that allows for efficient resource utilization and improved scalability.

2. Isolation:

Each OpenVZ container operates in an isolated environment, ensuring that processes and resources within one container do not interfere with others. This isolation prevents security breaches and enhances overall system stability.

3. Performance:

Due to its low overhead, OpenVZ provides near-native performance, allowing containers to run at speeds comparable to running applications directly on the host system. This feature is particularly advantageous for high-performance computing and resource-intensive applications.

4. Fast Container Startup:

OpenVZ containers can start quickly, often within seconds. This rapid startup time enables efficient resource provisioning and scaling, making OpenVZ suitable for dynamic workloads that require rapid deployment.

5. Live Container Migration:

OpenVZ supports live migration of containers between physical hosts without disrupting running applications. This feature enhances system availability, facilitates load balancing, and enables seamless maintenance activities.

Use Cases

OpenVZ finds application in various scenarios, particularly in the realm of InfoSec and cybersecurity. Some notable use cases include:

1. Server Consolidation:

OpenVZ allows multiple applications and services to run on a single physical server, reducing hardware costs and simplifying management. By leveraging the isolation provided by OpenVZ containers, organizations can consolidate their infrastructure while maintaining security boundaries between different services.

2. Software Testing and Development:

OpenVZ facilitates the creation of isolated testing and development environments. Each container can be dedicated to a specific application or development stack, ensuring that changes or issues within one container do not affect others. This capability enables efficient software testing, debugging, and Prototyping.

3. Secure Web Hosting:

OpenVZ provides a secure hosting environment by isolating websites and applications within separate containers. This isolation prevents unauthorized access and limits the impact of potential security breaches. Additionally, OpenVZ's resource efficiency allows hosting providers to optimize resource allocation and offer cost-effective hosting solutions.

4. Penetration Testing and Forensics:

OpenVZ containers can be utilized to isolate potentially malicious activities during penetration testing or forensic investigations. By running suspicious applications or tools within a container, the impact on the host system can be limited, ensuring the overall security of the testing environment.

Career Aspects and Relevance

OpenVZ offers several career opportunities for individuals with expertise in virtualization, system administration, and cybersecurity. Organizations that utilize OpenVZ require professionals who can effectively manage and secure containerized environments. Skills in container orchestration platforms, such as Kubernetes, along with a deep understanding of containerization technologies, are highly sought after in the industry.

Professionals specializing in OpenVZ can find employment opportunities as:

  • Virtualization Administrators: Responsible for managing and maintaining OpenVZ environments, including container provisioning, Monitoring, and troubleshooting.
  • Security Engineers: Focus on securing OpenVZ containers, implementing access controls, and ensuring Compliance with industry standards and best practices.
  • Penetration Testers: Utilize OpenVZ containers to perform secure penetration tests and identify Vulnerabilities in containerized environments.
  • DevOps Engineers: Leverage OpenVZ for efficient software development, testing, and deployment, working alongside development teams to optimize containerized workflows.


OpenVZ stands as a powerful operating system-level virtualization solution with robust security features and resource efficiency. Its ability to provide isolation, near-native performance, and rapid container startup makes it a valuable tool in the InfoSec and cybersecurity landscape. By leveraging OpenVZ, organizations can achieve efficient resource utilization, enhanced security, and streamlined management of containerized environments.

To learn more about OpenVZ, refer to the official documentation available at Additionally, the OpenVZ community provides extensive resources and support through their mailing lists and forums.

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