The Problem: Security Monitoring Is Expensive and Complex

Customers ask us every week: “How do we monitor our servers for intrusions, vulnerabilities, and audit without spending thousands on a SIEM platform?” It’s a fair question. Enterprise security tools like Splunk, SentinelOne, or CrowdStrike start at thousands of dollars per year and require dedicated teams to manage. Small and medium businesses — the teams running five, fifty, or even two hundred servers — get priced out of the conversation entirely.

The result? Most SMBs operate blind. They might have basic server monitoring (CPU, disk, uptime), but nothing that tells them who accessed a sensitive file, whether a known vulnerability affects their stack, or what happened during a security incident six hours ago. Logs pile up on individual servers, nobody reads them, and the first sign of trouble is often a ransom note or a customer complaint.

What these businesses need is a unified security platform that collects logs from every server, detects intrusions in real time, tracks file changes, scans for vulnerabilities, and maps everything to audit frameworks — all without the enterprise licensing costs. Enter Wazuh.

What Is Wazuh?

Wazuh is a free and open-source security platform that combines SIEM (Security Information and Event Management) and XDR (Extended Detection and Response) capabilities into a single stack. Think of it as an open-source alternative to Splunk with built-in intrusion detection, file integrity monitoring, and vulnerability scanning — all in one package.

Originally forked from OSSEC in 2015, Wazuh has grown into the most widely deployed open-source security platform, with over 15,400 GitHub stars and active development by a dedicated team. It’s licensed under GPLv2 (manager and agent components) and Apache 2.0 (indexer and dashboard), meaning there are zero licensing costs no matter how many agents you deploy.

The platform has three core functions:

  • Log collection and analysis — Every log from every server, centralized in one searchable dashboard
  • Threat detection — Real-time correlation that spots intrusions, malware, and policy violations as they happen
  • Security posture assessment — Continuous vulnerability scanning, file integrity checks, and CIS benchmark audit reporting

Wazuh is also a CVE Numbering Authority (CNA), meaning it maintains its own vulnerability database and can assign CVE identifiers — a level of security commitment you’d normally expect from a paid vendor.

How Wazuh Works

Wazuh uses a three-component architecture that separates data collection from analysis and visualization:

1. Wazuh Agent

A lightweight endpoint agent installed on each server you want to monitor. Available for Linux, Windows, macOS, Solaris, AIX, and HP-UX. The agent collects logs, monitors file changes, checks running processes, and reports software inventories to the central server. Overhead is minimal — typically under 1% CPU idle and 50–200 MB RAM on Linux systems.

2. Wazuh Server (Manager)

The central brain that manages agents, processes incoming data through its rule engine, and generates real-time alerts. The server includes a built-in decoder system that parses hundreds of application and system log formats out of the box — Apache, Nginx, MySQL, PostgreSQL, SSH, sudo, Docker, and many more. Alerts are enriched with MITRE ATT&CK framework mappings, severity classifications, and remediation recommendations.

3. Wazuh Indexer and Dashboard

Built on OpenSearch (the open-source fork of Elasticsearch), the indexer stores all security data for fast searching and historical analysis. The Wazuh Dashboard provides the visual interface — interactive dashboards for security events, vulnerability reports, audit scoring, and file integrity changes. Searches that would take minutes in a raw log system complete in seconds.

Data flows like this: Agents send security data to the server ? the server analyses and correlates events ? alerts get sent to the indexer ? you view everything in the dashboard. The whole stack can run on a single server for smaller deployments or scale across multiple servers as you grow.

When You Need Wazuh — and When You Don’t

Wazuh is an excellent fit for:

  • Businesses running 5–500 servers who need centralized security monitoring but can’t justify enterprise SIEM licensing
  • Organizations with audit requirements — internal security audit, HIPAA, and CIS benchmarks all have pre-built controls and dashboards in Wazuh
  • Managed service providers (MSPs) monitoring multiple client environments from a single console
  • Teams that want vulnerability management without paying per-asset for commercial scanners
  • Any server operator who wants file integrity monitoring — detecting when configuration files, binaries, or sensitive data change unexpectedly

You probably don’t need Wazuh if:

  • You run one or two servers and basic log checking with journalctl and grep is sufficient
  • You already have a managed SIEM service from a provider that handles all the collection, analysis, and alerting
  • Your audit requirements demand a specific certified platform — some regulated industries require vendor-specific tooling

Practical Example: What Wazuh Catches That Basic Monitoring Misses

Let’s walk through a real scenario. You run a WordPress hosting business with 20 client sites on a single VPS. Your server monitoring tells you CPU, memory, and disk are all fine. But one afternoon, a client calls — their site is redirecting visitors to a phishing page.

Without Wazuh, you’d SSH into the server, check Apache access logs, search wp-content for suspicious files, and try to piece together what happened from half a dozen separate log files. It might take hours.

With Wazuh, here’s what happens automatically:

  1. File Integrity Monitoring detects that wp-content/themes/your-theme/functions.php was modified at 2:14 AM — an unauthorized change
  2. Log Analysis reveals the attacker gained access via a known plugin vulnerability — the relevant HTTP request is captured and correlated
  3. Vulnerability Detection flags that your WordPress installation has the unpatched plugin version installed — this CVE was published three days ago
  4. Alert fires to your Slack channel with full context: what file changed, what user made the change (or what process), the relevant CVE, and a remediation recommendation

What would have taken hours becomes a five-minute investigation. And because Wazuh stores all historical data in its OpenSearch indexer, you can pivot from today’s alert to examine the attacker’s entire activity trail going back weeks — something traditional monitoring tools simply can’t do.

Ops Note: SIEM Is Useful Only When Someone Reviews It

Security monitoring creates value when alerts feed a real response loop. In CWH operations, the practical pattern is to start with a small set of high-signal checks: SSH login changes, package updates, unexpected listening ports, webshell-like file changes, and disk growth. Add more rules only after the team knows who owns the alert and what the first action should be.

Getting Started with Wazuh on Your CWH VPS

Wazuh’s minimum requirements are modest: 4 vCPU, 8 GB RAM, and 100 GB SSD for monitoring up to 100 agents. This fits comfortably on a Canadian Web Hosting Cloud VPS in the VPS-4 tier or above. All our VPS plans include full root access and SSD storage, giving you complete control over your security stack.

The quickest way to get started is the assisted all-in-one installation:

# Download the current Wazuh installation assistantncurl -sO https://packages.wazuh.com/4.x/wazuh-install.shncurl -sO https://packages.wazuh.com/4.x/config.ymlnn# Edit config.yml first for production deployments.n# For a lab-sized all-in-one install, follow the current Wazuh quickstart:nsudo bash ./wazuh-install.sh -a

After installation, you’ll get a dashboard URL and admin credentials. From there, install agents on your servers with a single command and start collecting security data within minutes.

Not comfortable managing your own security platform? CWH offers Managed Support — our team handles installation, configuration, and ongoing maintenance so you can focus on your business.

Beyond the Basics: What’s Next

Wazuh is part of a broader security ecosystem. If you’re building out your security stack, you’ll also want to consider:

  • Intrusion prevention at the network layer — hardening your VPS with firewall rules and automated blocking via tools like Fail2ban or CrowdSec
  • Centralized logging foundations — Wazuh replaces the need for a separate logging stack, but if you need deeper log analysis, our logging platform comparison covers the alternatives
  • Authentication and access control — pairing Wazuh with a self-hosted SSO solution like Authentik gives you full visibility into who accessed what, integrated with your identity provider
  • Server-level intrusion prevention — Fail2ban vs CrowdSec helps you choose the right tool to block brute-force attacks before they reach your applications

Sources and Version Notes

This Wazuh overview was refreshed in May 2026 against current Wazuh documentation. The quickstart command is useful for evaluation, but production deployments should review the Wazuh installation guide, server sizing, agent rollout, TLS/certificate handling, and retention needs before installing.

Conclusion

Looking for a broader overview of which security tools every VPS actually needs? Our roundup 9 Essential Security Tools for Your VPS covers the full stack from UFW and Fail2Ban through to Wazuh and security headers — ranked by priority so you know what to install first.

If you suspect your server may already be compromised, don’t wait for a SIEM alert. Our incident response guide walks you through the immediate steps to contain, investigate, and recover from a breach.

Security monitoring shouldn’t be a luxury reserved for enterprises with six-figure budgets. Wazuh brings SIEM-level visibility, intrusion detection, vulnerability management, and audit monitoring to any organization — regardless of size. And because it runs on your own infrastructure, your security data stays in Canadian data centres where you control access.

Ready to get started? A CWH Cloud VPS gives you the performance and control to run Wazuh for up to 100 agents starting at an accessible monthly price. Read our WAF comparison for application-layer protection, and browse our VPS plans or contact our support team if you’d like help setting it up.