FleetDM Unleashed: The Open-Source Platform That’s Making Legacy MDM & EDR Tools Obsolete + Video

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Introduction:

In the evolving landscape of enterprise IT, visibility and control over every endpoint—from cloud servers to employee laptops—define modern security posture. FleetDM emerges as a potent, open-source Unified Endpoint Management (UEM) platform that consolidates device management, vulnerability reporting, compliance auditing, and security orchestration into a single pane of glass, challenging the cost and complexity of traditional proprietary stacks.

Learning Objectives:

  • Understand FleetDM’s core architecture and how it unifies endpoint visibility across Linux, Windows, macOS, and cloud infrastructure.
  • Learn to deploy FleetDM and execute osquery-based security queries for real-time asset inventory and threat detection.
  • Implement CIS Benchmark policies and automate compliance reporting using FleetDM’s native integrations and GitOps workflows.

You Should Know:

  1. Core Architecture & Deployment: Unifying On-Prem and Cloud Endpoints
    FleetDM operates on a client-server model where lightweight osquery agents are installed on endpoints, communicating with the Fleet server which provides the web UI and API. It doesn’t replace existing EDR or MDM but aggregates their data, adhering to a “play well with others” philosophy.

Step‑by‑step guide:

1. Server Deployment (Linux):

 Download the latest Fleet binary
wget https://github.com/fleetdm/fleet/releases/latest/download/fleet_latest.zip
unzip fleet_latest.zip
sudo cp fleet /usr/local/bin/

2. Initialize Database & Config:

 Prepare MySQL (or use provided Docker Compose)
sudo apt-get install mysql-server
mysql -u root -p -e "CREATE DATABASE fleet;"

3. Launch Fleet Server:

fleet serve --mysql_address=127.0.0.1:3306 --mysql_database=fleet --mysql_username=root --mysql_password=YOUR_PASSWORD --redis_address=127.0.0.1:6379 --server_cert=./server.cert --server_key=./server.key

4. Enroll Your First Linux Host:

 On the endpoint, install osquery and enroll with Fleet's generated command
curl -L https://github.com/fleetdm/fleet/releases/latest/download/fleet_latest.zip -o fleet.zip
sudo fleetctl package --type=deb --fleet-url=https://your-fleet-server.com --enroll-secret=YOUR_SECRET
sudo dpkg -i fleet.deb
  1. Mastery of Osquery: The Power Behind Real-Time Security Queries
    FleetDM leverages osquery, which exposes the operating system as a high-performance relational database. This allows you to run SQL queries to investigate anything from running processes to kernel modules.

Step‑by‑step guide:

  1. Access Fleet UI (`https://your-fleet-server.com`) and navigate to Queries.
  2. Create a New Query to detect potentially malicious binaries: 
    -- Find executables in /tmp or /dev/shm (common adversary locations)
SELECT  FROM file
WHERE (directory = '/tmp/' OR directory = '/dev/shm/')
AND mode LIKE '%EXEC%';
  3. Save & Run this query across a label (e.g., “All Linux Hosts”). Results populate in real-time.
  4. Schedule a Query to run hourly and alert via webhook if results are found, turning detection into automated response.

3. Implementing CIS Benchmarks and Automated Compliance

FleetDM includes pre-built policy packs for CIS Benchmarks, automatically scoring endpoints against hardening standards.

Step‑by‑step guide:

  1. In the Policies section, click Add Policy and select CIS Benchmarks for your OS.
  2. Review Failing Policies. For example, a Windows policy check: “Ensure ‘Audit Process Creation’ is set to ‘Success’.”

3. Remediate using Fleet’s Script Integration:

For a failing macOS policy (e.g., “Gatekeeper enabled”), you can deploy a shell script via Fleet:

!/bin/bash
 Enable Gatekeeper
sudo spctl --master-enable

Upload this script in the Scripts section and assign it to hosts failing that specific policy.
4. Export Reports to CSV or automate tickets via Jira/Splunk integration for continuous compliance.

4. Advanced Integration: EDR Validation and SOAR Workflows

A key use case is verifying the health of other security tools. Fleet can query for the presence and status of agents like CrowdStrike or SentinelOne.

Step‑by‑step guide:

1. Create an EDR Health Check Query:

-- Check for CrowdStrike Falcon sensor status on Windows
SELECT name, status FROM services WHERE name LIKE '%Falcon%';
-- On Linux
SELECT  FROM processes WHERE name LIKE '%falcon%';

2. Set up a Webhook Destination (Settings -> Integrations). Configure a URL to your SIEM (e.g., Splunk HTTP Event Collector) or ticketing system (Jira).
3. Create a Policy that fails if the EDR process is not found. Configure the policy to trigger the webhook, creating an alert in your SOC’s primary workflow automatically.

  1. Software Asset & License Management: Cutting Costs and Risk
    FleetDM maintains a live software inventory, allowing you to track installed applications and versions across 100,000+ endpoints to identify unused or unlicensed software.

Step‑by‑step guide:

  1. Run a packaged query like `apps` or `programs` to list all software.
  2. Use the Fleet API to extract this data for analysis: 
    Get all software from hosts using Fleet's API
curl -X GET https://your-fleet-server.com/api/v1/fleet/software \
-H "Authorization: Bearer $API_TOKEN" | jq .
  3. Filter and Report: Pipe this data into a Python script or BI tool to identify software installed on less than 5% of hosts, flagging potential for license reclamation.

What Undercode Say:

  • Key Takeaway 1: FleetDM is not just a tool but a force multiplier for existing security investments. By providing a unified query layer, it validates and enhances EDR, MDM, and SIEM platforms, closing the visibility gaps that adversaries exploit.
  • Key Takeaway 2: The shift towards open-source, API-first platforms like FleetDM represents the core of modern SecOps. It enables scalable, infrastructure-as-code security management, where policies are defined in YAML, deployed via Git, and monitored through immutable, audit-friendly logs.

Prediction:

Within three years, the traditional, siloed approach to endpoint management and security will be largely unsustainable for cost and efficacy reasons. Platforms like FleetDM that offer unified visibility, born from the osquery ecosystem, will become the foundational layer for Zero Trust architectures. We will see a convergence of MDM, EDR, and vulnerability management capabilities into single, open-source projects, forcing legacy vendors to radically adapt or be replaced. The era of agent consolidation, driven by economic pressure and the need for real-time, queryable security data, has definitively begun.

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