How to: Store data with foreign sources

If you use Provisiond to populate all or part of your node database, you may want to define how data is stored so that it remains in the same directory even if a nodeID changes. Mark Mahacek, Senior Application Support Engineer at The OpenNMS Group, shares how to do this in Storing data with foreign sources [...]

By |2021-08-05T20:59:18+00:00August 5th, 2021|

How to: Troubleshoot Minion Connectivity and Functions

The OpenNMS Minion includes useful, built-in commands to verify configuration and debug access to management agents. In this Discourse article, Ronny Trommer, Community/Product Manager at The OpenNMS Group, shows how to test connectivity with the Minion, perform a health check, execute a remote ping to arbitrary FQDNs or IP addresses, execute remote DNS lookups, run SNMP [...]

By |2023-01-11T20:59:24+00:00July 22nd, 2021|

New docs: Where to find them, why they’re better, and how to contribute

If you look at the OpenNMS documentation, you’ll notice a change. Yes, it has a more polished appearance thanks to our new corporate branding, but it also has improved content and functionality as a result of our recent migration from AsciiDoctor to Antora for building the documentation. Migrating the documentation was a huge undertaking (we’ll [...]

By |2023-01-11T17:20:03+00:00June 10th, 2021|

Not Your Dad’s OpenNMS

OpenNMS is an “old school open source project” in many ways. We’ve been around for 20 years, spent most of that time hacking on code, and our community feels like family. Typical of early open source projects, marketing and branding haven’t always been a top priority at OpenNMS. We’ve always had a logo (a logotype, if [...]

By |2021-05-12T05:17:46+00:00May 12th, 2021|

How to: Set up Distributed Monitoring with OpenNMS

Large, distributed networks can be difficult to reach and monitor from a central location, with challenges like firewalls, network address translation (NAT) traversal, overlapping IP address ranges, and locked-down environments. The OpenNMS Minion component extends the reach of Horizon/Meridian, so you can monitor systems and networks that would otherwise be inaccessible, for optimal visibility into every [...]

By |2023-01-11T16:21:05+00:00April 14th, 2021|

How to: Sizing Cassandra or Scylla for Newts

When you want to store large amounts of non-aggregated data (such as performance metrics), the round robin database (RRDtool) in OpenNMS may not be enough. OpenNMS provides a time-series data store (Newts) that works with Apache Cassandra or ScyllaDB to group metrics for more efficient storage and retrieval. It removes aggregation as a bottleneck to storage, [...]

By |2021-04-01T17:41:09+00:00April 1st, 2021|

CVE-2021-3396: Full Security Disclosure

OpenNMS Security Issue Requires Immediate Upgrade The OpenNMS Group recently learned about and fixed a security vulnerability that allowed local and remote code execution as an authenticated user via a custom, targeted JEXL expression. Thank you to Artem Smotrakov for notifying us of this issue. CVE-2021-3396 applies to the following: Meridian-2016.1.0 - Meridian-2016.1.24 Meridian-2017.1.0 - Meridian-2017.1.26 [...]

By |2022-11-17T18:43:04+00:00February 16th, 2021|

CVE-2021-3396: OpenNMS Security Vulnerability (Please Update)

We recently learned about a security issue with OpenNMS. Please refer to CVE-2021-3396 for more information. To protect everyone using OpenNMS from an exploitation of this vulnerability, the CVE will not provide full details of the vulnerability until Tuesday, February 16, 2021. This should provide time to upgrade your system before full public disclosure. This issue [...]

By |2022-11-17T18:43:24+00:00February 10th, 2021|

Coming October 2020: Meridian 2020!

Based on Horizon 26.1.3, here’s a preview of some of the features we’re excited to bring to Meridian 2020: Enriched Flows, Better Messaging with Kafka Configure flows to include node metadata before forwarding to Kafka so that you can aggregate flow data or integrate it with your own custom database to persist all flows. New Kafka [...]

By |2020-09-03T18:23:44+00:00September 3rd, 2020|
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