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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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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In my previous article, I demonstrated how easy it is to passively monitor Linux machines with Nagios Remote Data Sender (NRDS) and Nagios XI. In today’s article, I will cover passive monitoring of Windows machines via NRDS.
Monitoring Windows machines via NRDS is no different than monitoring Linux boxes. You need to follow the same three steps:
- Adding Configuration
- Client Installation
- Configuring the host and its services
Step 1 – Adding Configuration
Go to Admin -> Monitoring Config -> NRDS Config Manager, click on Create Config, select Windows (32- or 64-bit) from the Operating System drop-down menu, and click on the Next button. You will see the Edit NRDS Config page. Most of the config options will already be populated for you with the default options. All you will need to do is type a config name, select a token from the drop-down menu, and click on the Apply button. For this example, we will be creating a config called “Win7x64”.
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If you are currently using both Nagios XI and Nagios Network Analyzer, the release of Nagios XI 2014 has made it very easy to add Nagios Network Analyzer reports in XI. All you need to do is to configure the Network Analyzer Component in Nagios XI. Here’s how you do it:
- From the Nagios XI Web interface, click on the Admin menu, then click on the Manage Components menu.
- Find the Nagios Network Analyzer Component and click on the Edit Settings button.
- Click the Add a Server button.
- Enter the required information, and click Apply Settings.
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