As your organization grows, so does the number of servers, devices, and services you depend on.
The term “system” covers all of the computing resources of your organization. Each element in the system infrastructure relies on underlying services or provides services to components that are closer to the user.
In networking, it is typical to think of a system as a layered stack. User software sits at the top of the stack and system applications and services on the next layer down. Beneath the services and applications, you will encounter operating systems and firmware. The performance of software elements needs to be monitored as an application stack.
Here is our list of the best system monitoring software & tools:
- SolarWinds Server & Application Monitor EDITOR’S CHOICE Comprehensive monitoring system that includes a drill-down view of all of the resources and services that support each application. Start a 30-day free trial.
- Atera (FREE TRIAL) An IT infrastructure monitoring and management system that is delivered from the cloud and intended for use by MSPs.
- SuperOps RMM (FREE TRIAL) A SaaS platform that provides remote monitoring and management tools for MSPs to supervise the networks of their clients.
- ManageEngine Applications Manager (FREE TRIAL) Monitors on-premises applications, virtual infrastructure, and cloud systems with live performance tracking and root cause analysis functions. Available for Windows Server and Linux.
- NinjaOne (FREE TRIAL) – formerly NinjaRMM – a SaaS platform that bundles tools for the remote monitoring of hardware and software and can manage the systems of multiple businesses simultaneously.
- Paessler PRTG Network Monitor (FREE TRIAL) – Covers networks, bandwidth usage, servers, and applications. This tool is free for up to 100 sensors.
- N-able RMM (FREE TRIAL) A remote monitoring and management tool that enables central IT departments to manage IT resources on several remote sites.
- Site24x7 Server Monitoring (FREE TRIAL) Cloud-based monitoring service that tracks the performance of networks, servers, applications and Websites.
- Datadog Infrastructure Monitoring (FREE TRIAL) This system monitoring tool covers all IT hardware in a typical business including network devices and servers.
- Nagios XI and Nagios Core – Nagios XI is a paid monitor and Nagios Core is free. Both can be extended by thousands of add-ons that are available from the user community forum.
Users will notice performance problems with the software that they use, but those problems rarely arise within that software. All layers of the application stack need to be examined to find the root cause of performance issues. You need to head off problems with real-time status monitoring before they occur. Monitoring tools help you spot errors and service failures before they start to impact users.
The system stack continues on below the software. Hardware issues can be prevented through hardware monitoring. You will need to monitor servers, network devices, interface performance, and network link capacity. You need to monitor many different types of interacting system elements to keep your IT services running smoothly. Here we’ll look at six sophisticated system monitoring packages for Windows and Linux.
Why do system performance monitoring?
Knowing whether a computer has issues is fairly straightforward when the computer is right in front of you. (Knowing what’s causing the problem? That’s harder.)
But a computer sitting by itself is not as useful as it could be. Even the smallest small-office/home-office network has multiple nodes: laptops, desktops, tablets, WiFi access points, internet gateway, smartphones, file servers and/or media servers, printers, and so on. That means you are in charge of “infrastructure” rather than just “equipment.” Any component might start misbehaving and could cause issues for the others.
You most likely rely on off-premises servers and services, too. Even a personal website raises the nagging question, “Is my site still up?” And when your ISP has problems, your local network’s usefulness suffers. You need an activity monitor. Organizations rely more and more on servers and services hosted in the cloud: SaaS applications (email, office apps, business packages, etc); file storage; cloud hosting for your own databases and apps; and so on. This requires sophisticated monitoring capabilities that can handle hybrid environments.
Bandwidth monitoring tools and NetFlow and sFlow based traffic analyzers help you stay aware of the activity, capacity, and health of your network. They allow you to watch traffic as it flows through routers and switches, or arrives at and leaves hosts.
But what of the hosts on your network, their hardware, and the services and applications running there? Monitoring the activity, capacity, and health of hosts and applications is the focus of system monitoring.
System monitoring software essentials
In order to keep your system fit for purpose, your monitoring activities need to cover the following priorities:
- Acceptable delivery speeds
- Constant availability
- Preventative maintenance
- Software version monitoring and patching
- Intrusion detection
- Data integrity
- Security monitoring
- Attack mitigation
- Virus prevention and detection
Lack of funding may cause you to compromise on monitoring completeness. The expense of monitoring can be justified because of it:
- reduces user/customer support costs
- prevents loss of income caused by system outages or attack vulnerability
- prevents data leakage leading to litigation
- prevents hardware damage and loss of business-critical data
Expense on system monitoring reduces costs in other areas of the IT budget.
Read more: How to CPU Benchmark Test
Some basic system monitoring software tools
Anyone who’s curious about their workstation or laptop’s performance has likely encountered Windows Task Manager or Linux’s ps and top. (The more experienced know of Sysinternals on Windows and htop, atop, pgrep, and pstree on Linux.)
Task Manager is a good example of the basic activity monitoring information you can learn about a host, starting with what processes are running and which currently consume the most resources.
Climb up a level and it will show you current and recent utilization for key resources like CPU, memory, disk, and network connections. Other tabs will show you more details on running processes, operating system services, and other key data.
Unix and Linux have analogous tools, like top.
Task Manager and top provide a continuously updating display of utilization. These simple real-time monitoring utilities are good for basic ad hoc monitoring of a single machine, to see what’s running and what’s consuming the system’s resources.
Minimum system monitoring software capabilities
A more sophisticated system monitoring package provides a much broader range of capabilities, such as:
- Monitoring multiple servers. Handling servers from various vendors running various operating systems. Monitoring servers at multiple sites and in cloud environments.
- Monitoring a range of server metrics: availability, CPU usage, memory usage, disk space, response time, and upload/download rates. Monitoring CPU temperature and power supply voltages.
- Monitoring applications. Using deep knowledge of common applications and services to monitor key server processes, including web servers, database servers, and application stacks.
- Automatically alerting you of problems, such as servers or network devices that are overloaded or down, or worrisome trends. Customized alerts that can use multiple methods to contact you – email, SMS text messages, pager, etc.
- Triggering actions in response to alerts, to handle certain classes of problems automatically.
- Collecting historical data about server and device health and behavior.
- Displaying data. Crunching the data and analyzing trends to display illuminating visualizations of the data.
- Reports. Besides displays, generating useful predefined reports that help with tasks like forecasting capacity, optimizing resource usage, and predicting needs for maintenance and upgrades.
- Customizable reporting. A facility to help you create custom reports.
- Easy configurability, using methods like auto-discovery and knowledge of server and application types.
- Non-intrusive: imposing a low overhead on your production machines and services. Making smart use of agents to offload monitoring where appropriate.
- Scalability: Able to grow with your business, from a small or medium business (SMB) to a large enterprise.
The best system monitoring software & tools
What are the key criteria to have in mind when choosing system monitoring tools?
We reviewed the market for system monitoring software and analyzed the options based on the following criteria:
- A package that combines network server, and application monitoring
- Options for remote system monitoring
- Nice to have utilities that can be used by managed service provider technicians as well as inhouse IT departments
- Options to monitor cloud resources and internet-based assets, such as websites
- Network discovery and automated software inventory compilation
- A free trial for a cost-free assessment period or a money-back guarantee
- A good price for a full set of tools that provide all monitoring needs
- Ease of installation and use, including the availability of documentation, community forums, and support
- Commitment to continual updates, improvements, and ongoing maintenance.
- Real-world problem-solving applicability and a robust feature set.
The SolarWinds Server & Application Monitor (SAM) is part of the for-cost Orion suite of network monitoring and system management tools; we looked at components of the Orion suite in our article on the best sFlow traffic analyzers. Where the Server Health Monitor can meet the needs of a small shop, SAM can cover small businesses to large enterprises. SolarWinds offers a 30-day free trial of SAM.
- Monitors servers and applications
- Supervises virtual infrastructure as well as physical servers
- Alerts for resource shortages
As the name suggests, SAM monitors the system health and performance of server hardware and virtual servers from multiple vendors, as well as doing deep monitoring of many hundreds of applications. It can monitor multiple sites and cloud environments like Azure and AWS.
The SolarWinds Orion suite will auto-discover hosts and devices on your network. Then you can start to monitor them.
Once a server is identified and monitoring has been running, look under Node Details to see SAM’s display of the node’s performance and health data.
The server status data is displayed both graphically and in tables.
A second discovery scan is required so SAM can detect the applications running on the nodes previously discovered.
You can configure the application discovery scan to specify which applications SAM should look for. Then you provided the credentials SAM needs to access the information on the various nodes.
One SAM has detected applications and begun its regular scan, the Application Summary will show top-level status for applications running on your servers.
The summary includes application alerts and events, top 10 nodes by CPU load, by physical memory, virtual memory, I/O operations, etc.
SAM, working with the SolarWinds suite of network monitoring and management tools, provides a full range of features for customizable dashboards, analysis, alerting, reporting, etc.
SAM and the SolarWinds suite are enterprise-grade packages, so they are not cheap and call for considerable resources on the server hosting them. Most components tack on an additional charge. But if your network is large or growing, the SolarWinds suite with SAM is worth exploring.
- Designed with large and enterprise networks in mind
- Supports auto-discovery that builds network topology maps and inventory lists in real-time based on devices that enter the network
- Can map applications, networks, and infrastructure as well as highlight bottlenecks and dependencies
- Supports geographic location data to map and monitor global assets
- Uses drag and drop widgets to customize the look and feel of the dashboard
- Robust reporting system with pre-configured compliance templates
- SolarWinds SAM is a feature-rich enterprise tool that can take time to fully explore
MORE INFORMATION ON THE OFFICIAL SOLARWINDS SITE:
SolarWinds Server & Application Monitor is our top pick for system monitoring tool because it is able to detect and monitor all of the infrastructure that supports your user-facing software. That includes the operating system and the server resources, whether those servers are your own or cloud platforms. The Server & Applications monitor explores all of your applications and composes a dependency map that goes through to the network interfaces of the hosts. This record of a service stack makes identifying the root cause of performance problems easy and the Monitor will alert you when issues start to emerge so you can deal with them before the users notice.
Official Site: solarwinds.com/server-application-monitor/registration
OS: Windows Server
Atera is a remote monitoring and management system (RMM) designed for use by managed service providers (MSPs). The tool goes beyond system monitoring because it includes a large number of system administration utilities, such as a patch manager.
The Atera service enables the MSP technician to monitor the IT infrastructure of a client through the installation of agent software on that remote site. Once the service begins for a new client, the Atera system searches through the client network and logs all attached devices. This creates an equipment inventory and starts the monitoring process for each device.
Atera also searches all endpoints and servers to record what software is installed on the site. This search feeds through to license management functions in the system. Both the equipment search and the software log present opportunities for the MSP to adjust contracts to reflect exactly what infrastructure the service will monitor – many clients don’t know exactly what equipment and software they have on-site before the MSP contract begins.
- Designed for managed service providers
- Can monitor multiple sites simultaneously
- Includes server, network, and application monitoring
- Alerts for system problems
The monitoring system includes the supervision of networks, servers, and applications. The server monitor checks on all of the standard performance issues of a server. These include CPU, memory, and disk capacity and utilization.
The performance of applications is closely linked to the statuses of the servers that host them. This is particularly true in the case of virtualizations. Atera can monitor a wide range of applications including web and email servers, databases, virtualizations, and communication services.
The Atera system includes monitoring modules for in-house use by the MSP. These include contracts management, client management, and team management.
Beyond monitoring processes, Atera includes Help Desk management software that includes remote access and chat facilities for use by the technicians manning the Help Desk.
- Minimalistic interface makes it easy to view the metrics that matter most
- Flexible pricing plans
- Includes multiple PSA features, great for helpdesk teams and growing MSPs
- Can track SLAs and includes a time tracking option for maintenance tasks
- Designed for MSPs and enterprises – smaller businesses may not use all features available
Atera is a cloud-based service, so the MSP doesn’t need to install any software to use it. All access to the dashboards of the service is made through a standard web browser. The service is charged for on a subscription basis with fees levied per technician per month. There is also a yearly tariff available, which works out cheaper. Atera is available for testing on a free trial.
SuperOps RMM is a cloud package of tools that support MSPs in their task of watching over the systems of clients. This bundle includes functions to monitor networks and endpoints and also supplies system management utilities.
- SaaS platform
- Designed for managed service providers
- Monitors networks, servers, and applications
The monitoring features of SuperOps RMM offer automated network and endpoint status and performance tracking. It places thresholds of expected performance that trigger alerts if resource usage rises above an acceptable level. These alerts allow technicians to get on with other tasks, knowing that they will be drawn back to the monitoring console in time to take action should problems arise.
The RMM service includes a discovery module that polls an enrolled network for connected devices. This compiles an asset inventory and repeats in order to spot any system changes. The discovery service also logs operating system versions and installed software packages. This software inventory forms the basis for a patch management service.
An accompanying PSA package includes Service Desk features with a tasks routing system that can also be used to schedule technician time for maintenance jobs. The time that MSP staff spend on monitoring and management tasks for each client can be automatic ally fed through to a billing system.
All activity is logged, including those actions implemented manually and by automated processes. Many maintenance functions can be set up on schedules and it is possible to nominate a calendar of maintenance windows that can be used by automated processes, such as the Patch Management module to ensure that system management tasks don’t interfere with system availability.
- Operates as a lightweight SaaS tool – great for businesses poised for growth
- Offers numerous multi-tenant options, ideal for MSPs
- Offers asset management, endpoint management, and patching under one roof
- Features automation that can complete routines and tasks on a scheduled basis
- Would like to see a longer 30-day trial
The combination of RMM and PSA functions in a typical SuperOps plan means that the MSP gets all of the software it needs from this SaaS platform. There are four plans available and three of them include the system monitoring functions of the RMM bundle. You can access any of the plans on a 21-day free trial.
ManageEngine produces a suite of system monitoring tools and its Applications Manager tracks the performance of a range of system resources from on-premises software, to Web services, cloud infrastructure, and virtual systems.
- Monitors applications and servers
- Creates a dependency map
- Monitors physical and virtual infrastructure
The on-site applications monitoring service is able to trace application dependencies, creating an application dependency map. This is a very useful service that enables the system to track through supporting services and identify the root cause of any performance issues that appear in user-facing software. The type of services that are included in this monitoring system are databases, mail servers, and Web servers.
The Applications Manager has a section of website performance monitoring services, which include availability and response time monitoring and synthetic monitoring, which runs tests on the interactive elements in Web pages.
Other functions in the Applications Manager allow the monitoring of virtualization systems. It is able to monitor VMWare, Hyper-V, Citrix, Red Hat Virtualization, and Kernel-based Virtual Machine. The system also has processes for monitoring container services, such as Docker. This service will show live statuses of servers and VMs and also recent activity.
All of the monitoring services in the Applications Manager include performance thresholds and if these get crossed, the system generates alerts. Those alerts can be set up to forward notifications to technicians by email or SMS message.
- Offers on-premise and cloud deployment options, giving companies more choices for install
- Can highlight interdependencies between applications to map out how performance issues can impact businesses operations
- Offers log monitoring to track metrics like memory usage, disk IO, and cache status, providing a holistic view into your database health
- Can automatically detect databases, server hardware, and devices for real-time asset management
- Can take time to fully explore all features and options available
ManageEngine Applications Manager is implemented as on-premises software that installs on Windows Server or Linux. It is packaged in three editions: Free, Professional, and Enterprise. The Free edition is limited to five running monitors. The Professional edition includes most of the infrastructure monitors of the tool with a few specialist services, such as distributed tracing, reserved for the enterprise edition. You can get a 30-day free trial of Applications Manager.
NinjaOne – formerly NinjaRMM – is a SaaS package that offers a bundle of remote monitoring and management services. This is a product that was designed for managed service providers (MSPs) so it can monitor multiple sites and multiple business systems simultaneously. The service enables the complete separation of client system information. While it is a good tool for MSPs, the system can also be used by IT Operations departments that have multiple sites to manage.
- Produced for managed service providers
- Multi-tenanted architecture
- Monitors networks, servers, and applications
The service will scan the network of an enrolled system and log all connected devices. It then installs agents on endpoints and scans for software. The package includes network, endpoint, and software monitoring services. Tools within the service facilitate manual tasks but most of the system aims for completely automated monitoring and management processes. The advantage of NinjaOne is that it can squeeze as much value as possible out of each qualified technician working for the MSP.
An unusual feature of this RMM package is that it includes a ticketing system. This is a service that is usually included in professional services automation (PSA) bundles rather than RMMs. The ticketing system is a classic utility for Help Desk services. However, the NinjaRMM ticketing system can be used to manage the entire technician team.
An example of how the ticketing system operates lies with the performance alerting system that is built into the monitoring service. When a performance issue arises, the alert is channeled through the ticketing system for the attention of a suitably experienced technician. This system maintenance work can be threaded in with Help Desk tasks, making maximum use of the technician pool’s abilities.
The dashboards of NinjaOne are available in formats for technicians and for team managers. All of the console for this service is delivered from the cloud, so it isn’t linked to your own hardware and can be accessed from anywhere through any standard Web browser. This gives you the option of running a support team that is scattered geographically.
- Supports over 120 integrations – great for ITSM/PSA integrations
- The interface can be customized to both monitor clients as well as manage device inventory
- Builtin remote access with remote commands allow technicians to troubleshoot without initiating a session
- Supports custom scripts that can be deployed to multiple clients
- Could benefit from a longer trial period
- Caters to MSPs – not the best option for smaller networks
The Paessler PRTG Network Monitor is a “batteries included” solution that monitors your servers and devices, network traffic, and more. PRTG can use NetFlow and sFlow, and we covered it in some detail in our exploration of free NetFlow traffic analyzers.
- A customizable package
- Monitors for networks, servers, and applications
- Network device autodiscovery
The PRTG Network Monitor runs on Windows. It monitors mail servers, web servers, database servers, file servers, and virtual servers. PRTG can monitor multiple sites and cloud services. It uses SNMP, WMI, NetFlow, sFlow, ping, ssh, REST APIs, and packet sniffing.
Setting up the tool is a bit complex but a setup wizard and how-to video lead you through the steps. The tool will find many devices and servers via auto-discovery.
In the user interface, a primary view is the device tree showing the devices (including servers) in your network, and the sensors monitoring each.
On the server hardware side, its sensors can monitor CPU load, memory, disk, server room environment, etc. On the applications side, it comes with more than 200 sensor types for common network services, including HTTP, SMTP/POP3 (email), FTP, etc.
You can specify thresholds for alerts, and PRTG can send notifications of detected issues via several methods, including email and SMS. It provides a range of predefined reports and facilities for designing custom reports. Reports can also be scheduled.
- Customizable sensors for virtually any application, server, or service
- Integrates well into the PRTG ecosystem
- Flexible pricing based on the number of sensors in use make it applicable for small and large scale networks
- Live network maps enable technicians to visualize complex network infrastructure
- Dozens of integrations into other ticketing systems and messaging applications
- Designed for IP professionals, sensor setup and integrations require technical knowledge
The free version is limited to 100 sensors after a 30-day trial which you can download here. Because a sensor is an individual data stream, each server and device will typically require several sensors.
The free version of PRTG Network Monitor provides a well-stocked toolbox for monitoring a small network.
N-able RMM is a cloud-based remote monitoring and management software system. It can monitor networks, endpoints, mobile devices, servers, and applications. This service is not only a monitoring system. It can also automate many routine maintenance tasks and implement automated responses to status alerts or malicious activity.
- A package for managed service provider technicians
- Includes service desk system
- Monitors networks, servers, and applications
As this system is resident in the cloud, it doesn’t matter where the monitored resources are physically located. They don’t have to be on the same site as the IT support team. The service is also able to include cloud resources into the monitoring system.
The endpoint and server monitoring functions of the system keep constant checks on the capacity and utilization of CPU, memory, and disk space on each machine. Other server monitoring functions include the management of virtualizations and the availability of patches and updates for services and software.
Network management services focus on the capabilities of the Simple Network Management Protocol (SNMP). The N-able RMM system acts as an SNMP Manager, gathering status reports from device agents. Agent responses are interpreted into system data, which is shown live on the screens of the dashboard. SNMP also provides a system discovery function that will automatically document all network equipment.
The SNMP system includes an alerting mechanism. This means that technicians can work on other tasks and assume everything is OK with the network unless otherwise notified. The system alerts appear on the dashboard and can also be forwarded to key staff members via email or SMS message.
The dashboard offers summary screens for just about every category of equipment or service in the system. Each entry in a summary screen provides a link through to a details screen. Screens contain tables of data and also illustrative graphs and charts.
The system dashboard can be accessed from anywhere through a standard web browser or a special mobile app.
- Excellent monitoring dashboard, great for MSPs or any size NOC teams
- Scalable cloud-based deployment
- Monitor from anywhere via a web browser
- Automatic asset discovery makes inventory management easy, even on busy networks
- Wide variety of automated remote administration options make it a solid choice for helpdesk support
- Only available as a cloud SaaS
N-able RMM is charged for by subscription with no setup fees. This makes the service appealing for startups because there are no upfront costs involved in starting to monitor remote systems with N-able RMM. N-able offers a 30-day free trial for those who are interested in trying out the service
Site24x7 covers all of the aspects of system monitoring, giving you visibility on network, server, and application performance. This combination of competences is great for those who run virtualizations. The tool can monitor Microsoft Hyper-V and VMware and it’s also able to track the activities of Docker containers.
- SaaS platform
- A customizable package
- Also includes network, application, and Web service monitoring
As a cloud-based system, Site24x7 is location-neutral. Your entire infrastructure management team does not need to be physically located in the same building as the facilities being managed. The dashboard is accessed through a browser and there is also an app to gain access through mobile devices.
Server monitoring gives you constant updates on statuses that include CPU, memory, disk, network interface, software operating system, port, and file system checks. In total, the tool covers more than 30 different server performance factors.
The application monitoring screens in the tool give a constant live view of all activity on your network. It seeks out the causes of detected errors, down to analyzing lines of code.
Monitoring is not limited to one particular site. The Site24x7 package is able to reach across the network to check on multi-site systems and remote systems. If you don’t run your own servers, but use cloud resources, you can still deploy the Site24x7 monitor to get visibility on your network performance. The tool can monitor AWS and Microsoft Azure servers.
On-premises, Site24x7 can oversee devices running Windows, Windows Server, Linux, FreeBSD Unix, and OS X. The tool can give detailed activity data for each switch on your network and is also able to monitor wireless networks.
Site24x7 is offered in packages to suit website-driven businesses and MSPs as well as regular bricks and mortar companies. The service is charged for on a subscription basis and there is a restricted Free Edition that can monitor up to five servers.
- Cloud-based service minimizes startup costs for new MSPs
- Supports multiple alert channels including push notifications to Android and iPhone
- Monthly plans are designed to fit small new businesses as well as established enterprises
- Excellent root cause analysis for faster ticket resolution
- Would like to see a longer trial period for testing
You can get a 30-day free trial of the system. If you choose not to buy at the end of the trial period, you get switched over to the Free edition.
The Datadog Infrastructure monitoring system uses an alerting mechanism to spot status problems with IT equipment before they develop into major disasters.
- Monitors networks, servers, services, applications, and Web assets
- SaaS platform
- Traces component dependencies
The alert monitors don’t just look out for hardware failure, they also check that service level objectives (SLOs) are being met. This means that not only does it ensure that the system is working, it watches for signs that performance levels might become impaired to unacceptable levels.
The Datadog system is composed of a series of modules, so the hardware monitoring of the Infrastructure monitor is not the only option available. The Application Performance Monitor unit of Datadog also adds insights that are vital for system monitoring.
Combining modules creates enhanced monitoring options. For example, Application Performance Monitoring includes root-cause analysis features that link through to the Infrastructure module. This will identify performance problems with an application that is really a hardware capacity issue.
Adding on the Network Performance Monitoring module also allows the identification of traffic flows, which might be the real cause of slow delivery of applications.
All Datadog services operate from the cloud and can integrate the management of local, remote, and cloud-based resources. The monitored system all need to have an agent program installed on them so that the remote monitor can gather system statistics. The user of the monitor is then able to access the console through any browser from anywhere.
The Infrastructure module is offered in three plan levels: Free, Pro, and Enterprise. As the name suggests, the basic package costs nothing to use. The top plan, Enterprise, includes machine learning processes to set alerts to spot performance falling below acceptable levels.
- Great interface, easy to use, and highly customizable
- Can monitor both internally and externally
- Supports auto-discovery that builds network topology maps on the fly
- Prebuilt widgets allow users to create detailed dataflows in just a few clicks
- Flexible pricing plans make DataDog a great choice for any size network
- Would like to see a longer trial period for testing
The Network Performance Monitor and Application Performance Monitor are each available in one plan level. There is also an App Analytical add-on available for the APM. All modules are charged for by subscription with a monthly rate and a cheaper annual fee. Whichever payment period is chosen, each term has to be paid for in advance. Datadog offers a 15-day free trial of each of its modules.
Nagios is an enduring standard in network monitoring. Nagios Core is the open-source free version, and Nagios XI is the commercial for-cost variant with additional features and automated assistance for configuration. Nagios has a reputation for being powerful, reliable, scalable, and extremely customizable – and being complex to configure.
- Monitors networks, servers, and applications
- Extensible by thousands of free plug-ins
- Nagios Core is free forever
The free version has a learning curve but also an active community. It monitors servers, services and applications, just like the commercial version. It includes reporting by email and SMS, a basic user interface (including the network map), and basic reports.
Nagios Core lacks auto-discovery, and you must learn to set up and maintain complex configuration. On the plus side, it does give you a lot of flexibility to customize and extend the tool. Community-developed addons can perform discovery and help you get started with configuration.
You can use the free 60-day trial to evaluate the for-cost version and, if you elect to go with the free one, save the auto-generated config files from /usr/local/nagios/etc before uninstalling your eval copy. You can then use those files as your starting point for your new install’s configuration.
The commercial version Nagios XI has a richer range of features, including automated support for discovering your devices and hosts, automatically configuring the tool, and commercially-supported addons. It has a much more sophisticated user interface and more advanced reporting that covers trends, capacity planning assistance, etc.
Nagios XI is built to run on Red Hat Linux and CentOS. For Windows, use a VM appliance with Hyper-V or VMware. It includes an auto-discovery tool and a configuration management wizard for adding a new device, host, or application).
Once Nagios XI is installed and monitoring, the Operations Screen gives you a high-level view of the current state of the network, and the Operations Center lets you drill down to the items mentioned.
The Host Status page shows a summary of metrics for the monitored hosts. You can drill down to an individual host to see details including performance graphs, capacity planning info, alarms, etc.
The Service Status page summarizes the state of the monitored services.
Nagios is a well-regarded solution for network monitoring. As with other tools that offer a fully-free vs commercial version tradeoff, you must decide whether you have (or will develop) the expertise and time to use the free tool, or whether it would be more cost-effective to pay for the automation and support of the commercial version.
- Offers both an open-source free option as well as a paid plan
- Simple, yet informative interface
- Robust API backend makes it a great option for developers who want to integrate their own custom applications
- The open-source version lacks paid support – is likely not the best choice for larger companies
Choosing a System Monitoring Tool
Besides the tooling to monitor your systems, you need a protocol in place for solving problems and responding to incidents. Best practices for system monitoring call for forethought and attention to design.
Free tools are tempting, particularly if you are on a tight budget. The free versions of paid software are usually limited in their capacity so that they can only support small networks. Some freeware has worked its way into the toolkits of seasoned network administrators mainly out of familiarity. However, these underfunded tools are usually under-supported and glitch-laden.
Planning is a key stage when buying new monitoring software. You need to look for suites of monitoring tools that cover the whole system stack. Remember that spending on monitoring saves you money in other areas of the IT department and prevents loss of income to the business due to system failure.
System Monitoring Software FAQs
Where can I find device monitoring templates?
If your system monitoring tool operates on a template model per device type, they will probably have been shipped with the software bundle for that monitoring system. If you can’t find them, ask the Help Desk of the software provider for them. Another place to look for templates is on user forums for that tool.
Who in my organization is best to perform system monitoring?
The System Administrator in the IT department is responsible for system monitoring. In small businesses, the System Administrator IS the IT department. In larger organizations, different staff members will have responsibility for monitoring different services, for example, the DBA will be responsible for monitoring databases and the Network Manager or Network Administrator will be responsible for monitoring the network.
Where can I get a system monitoring training from?
The larger monitoring tool providers offer system monitoring training, which is usually geared towards the use of their products. For example, SolarWinds is the leading provider of IT resource monitoring tools and it also offers system monitoring training and certification through the SolarWinds Academy.