Esta semana liberamos para uso público un plugin de gran utilidad. check_unix_open_fds permite comprobar el número de descriptores de fichero abiertos por una aplicación.

El objetivo de conocer este valor es evitar un problema vinculado a la apertura de gran número de ficheros que se manifiesta por el error de sistema "Too many open files". Este error aparece usualmente por ataques contra servidores web y provoca un fallo por denegación de servicio (DoS).

El plugin, programado en Perl y compatible con Nagios 3.x, va acompañado de un archivo README con información detallada sobre sus requerimientos. Como siempre el plugin se puede descargar desde nuestra web o a través de Nagios Exchange.

New weekly free plugin for checking memory usage in unix-like systems: check_unix_mem_usage.

The fact to known the system memory usage plays a crucial role to prevent shortages in a system fundamental resource. Key benefits are, comparing this plugin with previous related plugins:

• It can check not only the overall memory consumption, but also the application memory consumption, the cache consumption and the swap consumption. Nowadays operating systems tend to use the max available memory over disk cache, for this reason, even when the system needs few resources, the memory usage percentages are close to 100%. This is the reason why we consider the total memory consumption a poor indicator.
• It allows checkings based on percentage of total, Bytes, Kibibytes, Mebibytes, Gibibytes and Tebibytes. Units based on IEEE 1541 standard.
• It support checks based on thresholds or ranges.

Plugin is Nagios 3.x (ePN) compatible. Attached README file includes plugin related information. It can be downloaded from our website or from Nagios Exchange.

This week we publish the first version change in one of our plugins. Thanks to the community of users who have trusted in our developments for their Nagios system we could get a bug in the plugin to check the memory status on Unix system, the check_unix_mem_usage.

As soon as we have received notice of the error we got down to work and we have corrected this bug and and two more that we have found in way. So, if you seemed functional the plugin, you will now be safer.

Thank you for trusting us. And, you can find the update both our downloads section and in the Nagios Exchange.

Our sincere thanks to José Renato Attab Braga.