openUBMC is an open-source BMC project that provides production-ready BMC software for server management. Built on open standards, it addresses the needs of today's rapidly growing AI infrastructure. Through open-source collaboration, openUBMC aims to deliver an accessible and powerful development platform, driving innovation and growth across the server management ecosystem.

What is BMC? ​

A BMC (Baseboard Management Controller) is a dedicated hardware component that offers an independent management interface for a computer system.

An "Out-of-Band Management Core" Independent of the Host System ​

The BMC has its own processor, memory, network interface, and power supply (sometimes shared with the mainboard but always independent of the host power control). It operates completely separately from the main CPU, operating system, and memory.

• Even if the host has no OS installed, the OS has crashed, or the CPU has failed, the BMC remains fully functional. Administrators can still monitor hardware status and perform essential tasks like restarting the server.
• During initial deployment, there's no need to boot the host system—administrators can configure hardware, update firmware, and even install the OS remotely via the BMC, significantly speeding up setup.

The "Bridge" Between Administrators and Hardware ​

Traditional server management often requires physical access, which is inefficient and location-dependent. The BMC changes this by providing a dedicated network port for remote access, acting as a bridge between administrators and the physical hardware:

• Administrators can manage the server remotely using a web interface, CLI tools, or integrated management platforms—no on-site visits needed.
• In large data centers, BMCs enable centralized oversight of hundreds or thousands of servers. From a single console, teams can monitor health, apply batch updates, and perform coordinated operations, greatly improving efficiency.

The "Guardian" of Hardware Reliability ​

Hardware failures can disrupt service availability. The BMC serves as a proactive guardian through continuous monitoring, alerting, and automated responses:

• It watches key hardware metrics in real time, spotting early warning signs (e.g., slowing fans or impending drive failures) and alerting administrators to prevent issues from escalating.
• Advanced BMCs can even take automatic corrective actions, such as boosting remaining fans to compensate for a failed one or switching to a backup power supply, helping maintain uninterrupted operation.

Supporting the Full Hardware Lifecycle ​

The BMC plays a role throughout a server's entire lifespan—from factory to retirement:

• Factory Stage: Manufacturers use the BMC for final testing and pre-loading firmware, ensuring devices ship in good condition with compliant software.
• Deployment Stage: Administrators configure settings, update firmware, and install OSes remotely for fast rollout.
• Operational Stage: Continuous monitoring, logging, alerting, and remote maintenance keep the server running smoothly.
• Decommissioning Stage: The BMC allows secure wiping of configurations and sensitive data to meet compliance and security requirements.

What is openUBMC? ​

openUBMC delivers a production-ready BMC solution built on a modern architecture. It provides comprehensive server management capabilities and integrates seamlessly with existing data center management systems.

Modern Micro-Component Architecture ​

openUBMC features an advanced micro-component architecture, where individual components—commonly referred to as "apps"—communicate over D-Bus. This design supports multiple extension mechanisms (full apps, plugins, and declarative configurations), allowing a single codebase to adapt efficiently across diverse computing platforms while accelerating development and shortening delivery cycles.

Leveraging standardized D-Bus interfaces, openUBMC decomposes complex management functions into small, independent, yet collaborative units. Developers can freely combine apps to create tailored BMC solutions, with plugins and configurations enabling rapid customization for specific hardware or use cases—delivering production-ready systems right away.

Community-Driven and Developer-Friendly ​

openUBMC is built with the community in mind, offering a comprehensive standard SDK and full D-Bus compatibility that make developing and integrating new components straightforward and fast. It provides an end-to-end development platform covering everything from design and coding to simulation, testing, and release—delivering a smooth, DevOps-inspired experience that lets developers get up and running quickly.

Whether you're adding new interfaces, supporting additional hardware, or extending management capabilities, openUBMC supplies open APIs, robust toolchains, and ready-to-use resources to accelerate your work. This enables rapid customization, seamless collaboration, and joint innovation within the community.

With complete toolchains and well-defined engineering practices, openUBMC significantly lowers the barrier to BMC development. The community also offers strong automated testing support to help maintain high quality standards across all contributions.

True Commitment to Open Standards ​

openUBMC actively embraces a wide range of industry standards and protocols while working hand-in-hand with the community to advance standardization efforts and ensure their practical implementation.

The community is deeply engaged in shaping both southbound and northbound specifications: from defining standardized interfaces for hardware component management (southbound) to driving the evolution and adoption of northbound protocols such as Redfish and IPMI. Through collaborative contributions, openUBMC helps establish robust, interoperable norms that benefit the entire server management ecosystem.

Beyond community-driven initiatives, openUBMC maintains ongoing partnerships with leading standards bodies including GCC, DMTF and OCP. These collaborations foster a co-built, win-win ecosystem for standards development, aligning efforts across the industry to accelerate innovation and promote broader adoption of open management solutions.

Begin Your openUBMC Journey ​

openUBMC development requires a properly configured environment. Follow the step-by-step guide in "Environment Preparation".

To understand the core design principles and start building your own BMC, check out "Build Your Own BMC".

Ready for a deeper dive? ​

• The "Development Guide" provides detailed, scenario-based documentation—read only the parts relevant to your use case.
• The "Design Reference" dives deep into feature design rationale and advanced usage, ideal for experienced developers looking to maximize the platform.
• The "Tool Guide" covers how to use the community-provided tools.
• The "API Documentation" includes comprehensive internal API references.
• The "Testing Guide" outlines testing best practices and test case design.
• The "FAQ" answers the most frequently asked community questions.