Blog Category: How To
In the wake of the CircleCI breach, we have been reviewing policies and updating keys and tokens used in our automation for anything that could potentially be affected. While we have no evidence of any of specific credentials being leaked, we've needed to document procedures for rotating keys anyway, so now was the perfect time to [...]
Monitoring processes that don't provide network services is a default use case in network monitoring. Because they aren't providing network services, black box testing won't work- you need an agent on your system providing an inside view of your operating system. The Net-SNMP agent is easy to install and configure on Linux or Unix. It's compatible [...]
Submitting issues, fixing bugs, contributing features, enhancements, and extensions, writing documentation, or reporting security issues are all valuable ways that our community helps make OpenNMS a better monitoring platform. OpenNMS uses Jira to manage issue tracking and development. Once you have a Jira account and have signed the OpenNMS Contribution Agreement (OCA), you can start [...]
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 [...]
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 [...]
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 [...]
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, [...]
Find out more about how using metadata in OpenNMS can streamline configuration.
The content of this post was accurate at the time it was published, but some of this information may have been superseded by later versions. Please see the currently maintained document on our wsman integration instead. WSMAN support has been present in OpenNMS for a while. The main motivator for adding support of this [...]
Running a Minion with Docker is relatively easy, you just need to have Docker installed. It makes also updating the Minion very easy cause you can follow the tags latest for latest stable version or trying a bleeding snapshot. You can configure everything through environment variables. At a bare minimum you need something like this: docker run --rm -d \ [...]
