Daily Post March 12 2026
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osquery
Originally developed by the security team at Facebook and released to the open-source community in 2014, osquery allows users to write SQL queries to explore operating system data. This approach abstracts the underlying complexity of different kernels and system APIs, providing a unified interface for querying everything from running processes and network connections to kernel modules and hardware events. Using the familiarity of SQL, osquery democratizes access to low-level system telemetry, making it as easy to audit servers as it is to query a local database.
Mechanics
It works by exposing the operating system’s state through a series of "tables." For example, if a user wants to see all active listening ports on a machine, they do not need to parse the output of a command like netstat or lsof. Instead, they can run a query against the listening_ports table. The osquery engine handles the heavy lifting of interacting with the system’s native APIs whether on Linux, macOS, Windows, or FreeBSD and presents the results in a standardized tabular format.
The tool consists of two primary components osqueryi and osqueryd. osqueryi is an interactive shell that allows for ad-hoc exploration of a single machine, which is valuable for incident response and debugging. osqueryd is a daemon designed for scheduled execution and continuous monitoring. When running as a daemon, osquery can execute queries at specific intervals and log only the changes in results, a feature known as differential logging. This reduces the volume of data sent to central logging servers, as it only reports when a new process starts or a specific configuration file is modified, rather than re-sending the entire state of the machine every few minutes.
Licensing
The project is licensed under the Apache License 2.0. This is a permissive free software license that allows users to use the software for any purpose, distribute it, modify it, and distribute modified versions of the software under the terms of the license. This choice of licensing has been a major driver of the tool’s adoption, as it provides the legal certainty required by large enterprises and the freedom valued by the open-source community.
osquery is a project under the Linux Foundation. This transition from a corporate-backed project to a foundation-governed one ensures that the development of the tool remains vendor-neutral and community-driven. It protects the ecosystem from a single corporate entity and ensures that the roadmap is influenced by the collective needs of the users.
Self-Hosted
A common question regarding osquery is whether it is a self-hosted solution. The answer is that osquery itself is an agent, not a centralized platform. However, it is designed to be the foundational layer of a completely self-hosted security and compliance infrastructure. Because osquery outputs data in standard formats like JSON, it can be piped into a variety of self-managed backends. Organizations can choose to send their osquery logs to a self-hosted ELK stack (Elasticsearch, Logstash, Kibana), a Graylog instance, or osquery fleet managers.
Solutions such as FleetDM or Zercurity provide a centralized web interface to manage thousands of osquery agents, allowing teams to schedule queries, manage configurations, and visualize results across the entire organization. Pairing osquery with these types of managers on private infrastructure, an organization can maintain full control over its telemetry data. This "sovereign" approach to endpoint monitoring is particularly good for orgs that havestrict data residency requirements or those who wish to avoid the escalating costs and privacy concerns associated with third-party SaaS security platforms.
Value
Its primary benefit is the consolidation of tooling. Before osquery, a security team might have needed separate tools for file integrity monitoring, vulnerability management, and incident response. Osquery can perform all of these functions through its various tables. For instance, the file_events table can track unauthorized modifications to critical system files, while the packages table can be queried to identify systems running outdated or vulnerable versions of software.
It allows for the automated auditing of hardware and software assets, ensuring that every device in the fleet meets the company’s baseline standards. For a Managed Service Provider or an internal IT department, this means the ability to generate real-time reports on disk encryption status, firewall configurations, or even the presence of specific hardware components without needing to manually touch each machine.
Integration
Its telemetry can be fed into an IDS or a SIEM system to provide the host-level context that network-level tools often lack. For example, if a network monitor detects a suspicious connection, osquery can be used to instantly identify which specific process on the host initiated that connection and which user was running that process.
The extensibility of the tool also allows for custom tables to be written in C++ or through a Python-based extension interface. This means that if an organization has a unique proprietary application or a specific hardware setup that needs monitoring, they can extend osquery to treat that specific data source as just another SQL table. This flexibility ensures that the tool can grow alongside the complexity of the enterprise it protects.
Check it out here: https://github.com/osquery/osquery