Alexis Kestler
Monitoring your IT infrastructure is absolutely critical to ensure high availability and prevent issues before they cause costly downtime. But with the complex hybrid environments common today, keeping tabs on your entire stack can be challenging. This is where a robust monitoring solution comes in handy.
As a fellow technology geek, I know how vital comprehensive infrastructure monitoring is for your business. Whether you‘re running a small shop or a Fortune 500 company, you need visibility into the health of your many interdependent components like servers, networks, applications, databases, and more.
The good news is – you don‘t need to break the bank purchasing proprietary monitoring software. There are excellent free and open source options that provide enterprise-grade capabilities.
In this comprehensive guide, we‘ll explore the 12 best open source monitoring and management platforms for keeping a close eye on your infrastructure.
For each tool, I‘ll share key features, use cases, integrations, scalability considerations, and more. My goal is to provide the insights you need to determine which open source solution (or combination of tools) best fits your environment and requirements.
Let‘s dive in!
Why is Infrastructure Monitoring So Important?
Before we look at the monitoring tools themselves, let‘s discuss why comprehensive monitoring is so critical for modern IT environments.
According to research by IDC, the average cost of infrastructure failure totals over $100,000 per hour. And according to Gatepoint Research, the average business experiences 1.6 hours of downtime per week – costing an average of $160,000 annually.
Yikes! Those stats make a compelling case for proper monitoring.
Here are some of the key reasons solid monitoring is a must:
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Prevent bigger problems – By detecting issues early, you can take action before they escalate into major outages.
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Meet SLAs – Monitoring helps ensure you meet service level agreements (SLAs) for uptime and performance.
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Optimized efficiency – With visibility into utilization and performance, you can optimize configurations and resource allocation.
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Faster troubleshooting – When issues do arise, targeted alerts speed up problem diagnosis and remediation.
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Compliance – Strict compliance standards like HIPAA require the ability to monitor and audit infrastructure.
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Business continuity – Monitoring provides the insights needed to keep mission-critical applications available.
Clearly, monitoring is much more than just a nice-to-have. It‘s a fundamental requirement for any organization that values availability, efficiency and compliance.
Key Capabilities of Infrastructure Monitoring Software
Now that we‘ve covered why monitoring matters, let‘s look at the key capabilities you should look for in a monitoring solution:
Data Collection Engine
This is the foundation. The monitoring system should automatically collect performance metrics, events, logs, and other observational data from all infrastructure components – including physical and virtual servers, network devices, applications, containers, cloud services, etc.
Robust data collection provides the raw inputs for all other monitoring capabilities. Leading tools support standard protocols like SNMP, ICMP, SSH, JMX, APIs, etc. to gather observations.
Visualization and Dashboards
All the collected data is useless if it can‘t be analyzed! The monitoring platform should present collected data visually in dashboards, graphs and topology maps to offer visibility into the health and performance of infrastructure.
Interactive visualizations make it possible to spot trends, anomalies, and relationships in the data. This transforms monitoring data into meaningful insights.
Alerting and Notifications
Alerting is one of the primary reasons you implement monitoring. Configurable alert rules allow you to define thresholds and conditions that trigger notifications when there are potential issues.
Alerts should integrate with notification platforms like email, SMS, Slack, PagerDuty and service management tools so problems get routed to the right responders.
Reporting
Reporting takes a historical look back at infrastructure metrics to inform capacity planning, cost management and compliance initiatives. Logs and audit trails are also critical forensic evidence.
Custom reports that analyze availability, utilization, traffic patterns, and other trends over time are extremely useful. Leading tools offer robust reporting capabilities.
Troubleshooting
When issues arise, monitoring data should empower faster troubleshooting and root cause analysis. Features like log search and correlation, topology views, and metric baselines help zero in on problems.
The best platforms integrate disparate data sources to uncover dependencies and patterns that point to the true cause of service disruptions.
Top 12 Infrastructure Monitoring Tools
Now that we‘ve covered the why and what of monitoring, let‘s look at 12 leading open source monitoring platforms:
1. Nagios
Nagios is one of the original and most popular open source infrastructure monitoring platforms, with a community of over 1 million users. It offers comprehensive monitoring of networks, servers, applications, services, cloud infrastructure and more.
Used by major companies like PayPal, Cisco, United Airlines and Vodafone, Nagios handles monitoring for some of the largest IT environments in the world.
Key Features:
- Monitor practically all infrastructure components and protocols
- Highly customizable alerting, reporting and dashboards
- Broad community support and over 5,000 addons
- Available in open source and commercial editions
- Trusted by massive companies, but also very accessible for smaller teams
With its flexibility and breadth of capability, Nagios is a great choice for many use cases. The open source core is free and comes with all the fundamental features. For larger deployments, Nagios XI adds enterprise-grade capabilities.
2. Icinga
Icinga is another popular enterprise open source monitoring system used by major brands like Adobe, DocuSign, AMD and Zalando. It‘s designed for flexibility, scalability and ease of use.
Initially a fork of Nagios, Icinga has evolved into a robust monitoring platform in its own right. It simplifies monitoring of hybrid infrastructure spanning on-prem, cloud, containers and edge environments.
Key Features:
- Monitor entire technology stacks
- Scales to massive environments with clustered deployments
- Customizable dashboards and reporting
- Flexible notification methods and scheduled downtimes
- Extension modules and integrations available
- Open source and commercial editions
Like Nagios, Icinga is accessible for smaller organizations yet can scale up to massive multitenant deployments. Its cluster-aware architecture provides high availability and distributed monitoring capabilities.
3. Zabbix
Zabbix provides high-performing and scalable monitoring for networks, servers, cloud resources and virtually anything with an IP address. Its web-based interface makes it simple to configure monitoring, set alerts and visualize data.
Zabbix offers templated monitoring configurations and integration with notification tools. It captures extensive metrics and events out of the box with auto-discovery of network devices and servers.
Key Features:
- Auto-discovery of network topology and servers
- Powerful alerting engine
- Customizable dashboards and visuals
- Broad monitoring coverage with 400+ templates
- 100% open source software
- MLS-level scalability
Used by major companies like Rackspace, Juniper, HPE, and Docker, Zabbix is one of the most full-featured open source monitoring platforms available today.
4. Prometheus and Grafana
Prometheus and Grafana are wildly popular open source platforms that are tightly integrated to deliver metrics monitoring, alerting and visualization.
Prometheus handles scraping and storing time series metrics data, while Grafana allows visualizing the data in beautiful and configurable dashboards. Together they provide a full-stack monitoring solution.
Key Features:
- Prometheus specializes in gathering metrics data
- Grafana excels at visualizations and dashboards
- Horizontal scalability through Prometheus instances
- Automatic service discovery and relabeling
- Works perfectly for container and cloud monitoring
- Integrates with other data sources like InfluxDB
This combination is the defacto standard for monitoring Kubernetes and cloud-native infrastructure. The Grafana ecosystem also offers Loki for log monitoring and analytics.
5. checkmk
checkmk touts unified data for comprehensive monitoring visibility. It auto-discovers infrastructure components and includes over 2000 plugins to monitor virtually any system or application.
checkmk consolidates monitoring data from different sources into a centralized platform. This eliminates silos and provides a single pane of glass view.
Key Features:
- Unified monitoring data for consolidated visibility
- Automatic discovery of servers, network devices, Docker containers etc.
- Handles complex hybrid infrastructure and microservices
- 200+ integrations with leading enterprise tools
- Open source Raw Edition and commercial Enterprise Edition
checkmk scales from small business needs to the largest enterprise deployments. Its advanced alerting engine offers flexible configuration options and smart notifications.
6. Netdata
Netdata has become massively popular as a real-time metrics monitoring and troubleshooting platform. It excels at gathering metrics at 1-second granularity to enable highly detailed performance visibility.
Netdata runs on Linux servers with zero configuration required. It can monitor thousands of metrics per server out of the box and integrate seamlessly with other tools.
Key Features:
- 1-second granularity for metrics, dashboards and health alarms
- Unparalleled scalability to thousands of nodes
- Anomaly detection using machine learning algorithms
- Hundreds of preconfigured collectors for metrics, logs, APM spans, etc.
- Easy integration with Prometheus, Grafana, OpenTSDB, Kafka etc.
Netdata is purpose-built for container environments like Kubernetes and Docker. Its unique architecture offers true real-time observability not found in other tools.
7. OpenNMS
OpenNMS offers enterprise-grade network infrastructure monitoring and event management. It‘s widely used by major companies like Cox, MIT, Github, Verizon and Under Armour to monitor mission-critical networks.
While OpenNMS specializes in networks, it can monitor servers, applications and custom metrics as well. The open source edition is free and comes with robust capabilities. Paid versions offer additional features, support and certifications.
Key Features:
- Network discovery, topology mapping and visualization
- Monitor network gear, servers, apps, custom metrics
- Integrated event and notification management
- Business service monitoring
- Highly scalable distributed deployment architecture
- Open source community edition available
For organizations looking for a full-featured network management platform, OpenNMS is a leading open source choice.
8. Observium
Observium provides powerful network device and infrastructure monitoring, alerting and reporting. It auto-discovers Cisco, Juniper, Linux servers, VMware devices and more on the network.
Observium presents performance metrics and health status through intuitive web dashboards. It supports digging deeper into issues using drilldown reports and logs.
Key Features:
- Auto-discovery of network infrastructure and servers
- Monitoring with SNMP and common protocols
- Alerting based on flexible thresholds
- Custom reports for availability, bandwidth, utilization etc.
- Open source community edition available
While Observium focuses on network infrastructure, it can monitor server health as well. It scales from small business to large enterprise deployments.
9. Nagios Log Server
Nagios Log Server provides powerful log aggregation, searching, reporting, notifications and analytics. It allows quickly analyzing any log data to identify issues or security threats.
This tool complements Nagios XI with dedicated log management capabilities. It integrates with Nagios‘ network monitoring and event management to provide correlated insight.
Key Features:
- Centralized log aggregation in one secure repository
- Real-time search and reporting
- Intelligent alerts based on log patterns
- Correlates metrics and logs for faster troubleshooting
- Open source and commercial editions available
For deeper monitoring, Logs provide crucial forensic evidence. Nagios Log Server offers log management purpose-built for infrastructure monitoring use cases.
10. Elastic Stack
The Elastic Stack – aka ELK stack – is a collection of popular open source tools for log aggregation, searching, visualizing and monitoring logs and metrics. The core components are:
- Elasticsearch – scalable log and data indexing and search
- Logstash – collecting and transforming log data
- Kibana – visualizations and dashboards
- Beats – lightweight data shippers
Key Features:
- Centralized logging with high-performance search and analytics
- Real-time dashboards and alerts
- Scales to terabytes of log data daily
- Wide protocol support for gathering logs
- Integrates with APM tools like Zipkin and Jaeger
- Extensive library of integrations and plugins
The Elastic Stack provides and end-to-end solution for gathering, analyzing and visualizing virtually any log data at massive scale.
11. Graphite
Graphite is a monitoring tool specialized for collecting, storing and graphing time-series performance data. It is designed to handle fast writes of time-series metrics from thousands of systems in real time.
Graphite consists of these core components:
- Graphite web app – UI for visualizing metrics
- Carbon – metrics collection and storage daemon
- Whisper – time-series database library
Key Features:
- Optimized for handling high-volume numeric time-series data
- Real-time graphing and dashboards
- Data analysis using rendering API
- Integrates with major monitoring tools
- Scalable to over 10,000 metric sources
Graphite lets you build dashboards with real-time graphs of thousands of metrics like application performance, traffic, server health, etc. It‘s commonly used with tools like StatsD, collectd, InfluxDB and Nagios.
12. Graylog
Graylog is a leading open source log management platform that allows streaming, storing, analyzing and alerting on log data. It is fast, scalable and provides deep analytical capabilities.
Graylog handles terabytes of log data daily in large-scale production systems. Its stream processing pipeline allows analyzing log events in real time.
Key Features:
- Collect and analyze terabytes of log data daily
- Intelligent log search, analytics and correlations
- Configure real-time alerts and notifications
- Custom dashboard and visualizations
- Scalable pipeline for stream processing
- Open source and enterprise editions
Graylog gives infrastructure and security teams an indispensable tool for monitoring logs and pinpointing issues rapidly. Its open source edition is free.
Key Considerations When Choosing an Open Source Monitoring Tool
With the wealth of open source monitoring tools available, it can be daunting finding the right platform (or combination of tools) for your needs.
Here are some key factors to consider when evaluating open source monitoring software:
Scalability – Will the tool scale with your growth? Look at metric ingestion rates, data storage, UI performance, etc.
Supported integrations – What adjacent tools like SIEM, CMDB, service desk etc. integrate with the platform?
Visualizations – Do the dashboards, topology maps and graphs allow clear visibility into infrastructure and app health?
Ease of configuration – Is it straightforward to set up monitoring, thresholds, alerts etc. without extensive training?
Community support – Is there an active community and ecosystem of resources around the tool?
Learning curve – How steep is the learning curve for administrators to become productive with the tool?
Feature set – Does the tool cover the breadth of monitoring capabilities needed out-of-the-box?
Commercial offering – Does the vendor offer a commercial version with additional support, features and integrations?
Data collection – Does the tool support collecting metrics, events and logs from all your needed data sources?
By carefully evaluating these aspects, you can zero in on the right monitoring solution for your unique environment and use cases.
Most commonly, organizations combine multiple open source tools to achieve the right coverage and capabilities across metrics, logs and other data sources. For instance, Prometheus for metrics, Elastic for logs and Grafana for visualizations.
Final Thoughts
I hope this guide has provided you a helpful starting point for navigating the wide landscape of open source monitoring tools.
Robust infrastructure monitoring is too critical to skip. Take the time to properly evaluate the various solutions based on the needs of YOUR environment and use cases.
The good news is open source monitoring software has matured tremendously over the years. There are enterprise-grade tools available that can deliver 99.99% uptime backed by a thriving community.
However, even the best software is only part of the equation. You need properly trained staff that can configure alerts, dashboards and integrations to get the most value from your monitoring investment. So empower your teams with training and resources.
If you have any other questions around open source monitoring or best practices, don‘t hesitate to reach out! I‘m always happy to help a fellow technology enthusiast.
