This shell script for Nagios to check free memory on your Linux machines, this can support to CentOS, Fedora, Ubuntu Families and etc.

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This post describes to install and configure Nagios Client on Ubuntu system, You need to updates necessary packages, install libtool, openssl, libssl dev.

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If you may receiving the following errors from the nagios alert, Return code of 255 is out of bounds.

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I hope you know to install Nagios monitoring server on CentOS, this post describes to configure the Nagios client in Ubuntu machine. very simple steps to install,

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We have already described Nagios installation, Client configuration in the last post, this is explain to service group configure in Nagios server.

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If you may get an error cannot find SSL libraries, while configuring NRPE for Nagios

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-e or --expect option is monitoring http response code, at least one of them is expected in the first line of server response httpd 1.x.

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