Jan 12
With the likes of cloud computing and virtualisation starting to become staples for today’s business, IT environments are continuing to grow in complexity. Furthermore, there is growing pressure on many organisations to reduce the environmental impact of their IT systems.
In response to these developments, organisations need to change the way they manage and therefore monitor their IT infrastructure. For example, with the advent of virtualisation, organisations now have a fundamentally different infrastructure platform from which they are running business systems. This in turn requires a different monitoring approach. Continue reading »
Tagged with: cloud monitoring • Green IT • Nagios • Opsview • Virtualization
Dec 12
Apache Solr is an open source enterprise search service from the Lucene project. Solr is written in Java and runs as a standalone full-text search server within a servlet container such as Tomcat.
Like any service or component in your architecture, you’ll want to monitor it to ensure that it’s available and gather performance data to help with tuning.
In this post, we’ll look at how we can monitor Solr, what performance metrics we might want to gather and how we can easily achieve this with Opsview.
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Tagged with: agentless checks • apache solr • JMX • Lucene • Nagios • nrpe • Opsview
Sep 19
Alerts happen. They are the reason why monitoring applications were created: to alert us when servers need attention. The difference between an effective network monitoring system and an annoying one is a fine line between information and noise. Alerts should be descriptive and prompt an administrative action, not elicit a huff of frustration. Here are a few ways to keep your Opsview installation (and you) effective and relevant in your company. Continue reading »
Tagged with: android • Apache • distributed monitoring • Host groups • Linux • mobile • monitoring alerts • Nagios • service groups • system administrators • Windows
Sep 06
By tcallway Forked software, Frameworks, MSPs, Nagios, Opsview, SNMP, System Management, api, business systems, icinga, multi-tenancy, security
Freeware IT monitoring tools are used by thousands of organisation worldwide however using them to monitor complex network, server and application installations can be quite a challenge. This blog post takes the basic capabilities of one such tool, Nagios® Core, and shows how you can scale it with Opsview for use in enterprise environments.
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Tagged with: Nagios • network monitoring • open source monitoring
Aug 30
Many freeware IT monitoring tools are great but using them to manage complex systems can be a real challenge. It can also be unforgiving on anyone less than expert in configuring the system with mistakes being punished by a complete stop in monitoring activity.
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Tagged with: Nagios • network monitoring • open source monitoring
Jan 25
Opsview Community 3.11 - Free distributed monitoring
One of Opsview’s great features is distributed monitoring, which we’ve had for over 5 years now. From the web user interface, you can assign hosts to a slave system and Opsview will take care of all the configuration work for you: from the slave configuration files, to the slave results sent to the master, to the master configuration with freshness checking.
We do all the system integration work, so you don’t have to.
Continue reading »
Tagged with: distributed monitoring • Nagios • Opsview
Jan 11
We’ve just fixed a bug in Nagios® which an Opsview user had raised to us. A change made to Nagios in version 3.2.2 caused an issue where service alerts were being raised in the nagios.log file for every result that came back from a host that was down. This had the impact of adding lots of extra alerts that were overwhelming Opsview’s event views.
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Tagged with: bug • continuous integration • fix • Hudson • Nagios
Dec 07
The JNRPE server provides an open source Java implementation of the Nagios Remote Plugin Executor (NRPE). This is much more efficient for performing JMX checks than regular NRPE as you only need to start one JVM rather than a JVM instantiation per check (as performed by check_jmx invoking java -jar JMXQuery.jar).
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Tagged with: java • JMX • Nagios • Opsview
Aug 05
NRPE is great for getting plugin information from a remote host. We wanted to use it to get passive data regarding events, such as syslog entries that SEC had highlighted. This meant we needed two things: multi-line support and larger amounts of output.
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Tagged with: Nagios • nrpe • Opsview
Jan 08
In our continual task to try and speed up Opsview, we found a bug in NSCA’s handling of aggregate writes when run in –single mode.
The specific failure scenario is this:
- NSCA and Nagios are told to start up
- A send_nsca request is received by NSCA before Nagios has created the nagios.cmd command pipe
- NSCA tries to write to open the command file, but sees it is not there
- NSCA opens the alternate dump file instead
Now when Nagios does create the nagios.cmd file, NSCA uses that … unless aggregate mode is on and daemon mode is –single. In this case, it continues to use the alternate dump file, thus Nagios doesn’t see the results from the slaves.
Here’s the patch, which we’ve also added into our source for Opsview.
As we are very keen on good testing, we’ve managed to recreate the failing behaviour in a test script. You also need a test configuration file and a patch to the test framework. If you run this test, it will show the error and then after the patch is applied, the test should pass.
Tagged with: distributed • nagconf • Nagios • NSCA • Opsview
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