Weblogic is a popular Java-based application server that acts as a middleware between the application and the Java environment. It provides a framework for developing traits such as reliability (recovering from failures), scalability (dynamic service scaling) and security (unified security system for apps). Nagios XI has the ability to monitor various aspects of Weblogic using wlsagent as outlined in our document Monitoring WebLogic With Nagios XI. In this post I will expand upon some of those metrics, such as what they mean and why they are important. Links to further reading will be provided where relevant.
Continue reading ‘Monitoring Weblogic Metrics 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.
Continue reading ‘Monitoring Apache Cassandra Database Nodes with Nagios XI’
The latest Nagios XI – Amazon EC2 cloud images have been pushed out to the following additional location:
The Nagios XI cloud images are an excellent opportunity to try Nagios XI without having the upfront expense of dedicated hardware and can be upgraded with virtually zero downtime.
Continue reading ‘Nagios Cloud Monitoring Now Available in Sydney Australia’
Anyone who rents or owns a domain knows that its registration will expire unless it is renewed. An expired domain can cause loads of issues for groups who rely on the accessibility of said domain whether they are large or small. One major issue that can stem from an expired domain in which you may have forgotten to renew is that a “squatter” could potentially register that domain under their own name and grab your valuable traffic for themselves. With the new Domain Expiration Wizard you can monitor down to the day of when your domain will expire. This is done by checking against the registrar to determine the time remaining so that you can renew your registration before it becomes too late. This is only one of the new wizards included in our latest release of Nagios XI 2014.
The Domain Expiration wizard can be ran in a few easy steps:
- First, Enter the address of your domain:
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