Tag Archive for 'NRPE'

Monitoring Apache Cassandra Database Nodes with Nagios XI

As cloud services grow in popularity, so do the networks that provide those cloud services.  Few webserver-based distributed databases are as easy to install and configure as Apache Cassandra.  Apache Cassandra is an open source distributed database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. Cassandra offers robust support for clusters spanning multiple data centers, with asynchronous master-less replication allowing low latency operations for all clients.

Cassandra relies on the Java platform, and as those of you who have tried to configure Java app monitoring most likely know, the experience can be painful.  There are a handful of plugins on the Nagios Exchange that attempt to simplify the configuration.  As these plugins rely on the Apache Cassandra utility “nodetool”, you either need to install Cassandra on the Nagios server (which is not suggested) or use an agent (like NRPE) to run the plugin script directly from the Cassandra server (which should have the nodetool utility).

The Cluster Node Check is designed to verify whether the number of live nodes is less than a specified number, and if so trigger a warning or critical alert within Nagios.

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NRPE 2.15 Released – Now with IPv6 Support

NRPE 2.15 was released earlier today. The primary update in this version of NRPE is full support for IPv6.

The NRPE daemon now has the ability to listen on IPv4 and/or IPv6 addresses. In addition, the check_nrpe plugin now accepts switches that specify whether an IPv4 or IPv6 connection should be made to the NRPE daemon. The NRPE daemon has always had the ability to perform checks using IPv6, assuming the plugin it runs supports it. Thanks to Leo Baltus for the patch that made this possible.

IPv6 communication has been tested on Linux (RHEL/CentOS) and is known to work there. It also known to compile on other Unices that we have access to: Solaris 10, AIX 5.3 and 6.1 and HP-UX 11i v1. Feedback on these and other platforms is welcome. Bugs or enhancements (preferably with patches) can be submitted to http://tracker.nagios.org. Other discussion/questions can be sent to the mailing lists or http://support.nagios.com/forum.