Initially complicated but well worth the effort.
Use Cases and Deployment Scope
We use OpenNMS to monitor all aspects of our networks, identify issues and to alert us of any problems. The level of detail is great, and we can often spot and deal with potential issues before they actually manifest as a problem. When we do find ourselves with a network critical issue, OpenNMS alerts us within seconds and tells us where to look. Once you have everything running, you will wonder why you didn't do it sooner.
Pros
- Can monitor practically anything. Service availability, performance, latency, network interfaces, routing, hardware, and so on, and via different methods. If you need to monitor something on your network, you almost certainly can with OpenNMS.
- The OpenNMS web-based dashboard is very comprehensive and offers a ton of detail, covering everything you are monitoring. The ability to get a reassuring overview of the entire network is great, and to be able to whittle down the data to specifics, is a game changer.
- OpenNMS has a great online community, with a massive amount of support available via countless forums, blogs, YouTube, etc. If you get stuck on an issue, you'll find someone who's been there, done that, and detailed a resolution.
- Available free and open-source (with paid support and plans available for those who require it).
Cons
- It takes a fair amount of experimentation to fine tune information collection.
- Configuration can be quite cumbersome with a steep learning curve. It would be nice if more of this could be done via the web dashboard.
- The reliance on Java will put some users off. However, in fairness, it does mean it runs on a wide variety of hardware.
Likelihood to Recommend
<div>I would recommend all system administrators use some form of network monitoring if they are not already doing so, and I'd definitely recommend people consider OpenNMS if they're shopping around. Small businesses will benefit from the low-cost of entry (it's free!), whilst getting all the enterprise features. Larger businesses can benefit from paid support plans.</div><div>
</div><div>However, there's no getting around the fact that you will require some advanced networking and sysadmin knowledge to get the most out of OpenNMS, or at least, be prepared for a steep learning curve. If you don't have the resources to devote this time initially, you may struggle.
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