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Monthly Archives / November 2016

  • Nov 24 / 2016
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Linux

NRPE – Enable command args (Jessie, …)

With recent versions of NRPE server, the possibility to enable command args has been disabled.

For example, on a Debian Jessie, you can get this kind of error on console:

and in logs:

!WARNING! This change can lead to security issue, this is why it has been disabled by default. You have to double check your servers can’t be reached from anywhere with NRPE commands (to avoid execution of unwanted or malicious code).

Once you’re sure there’s no security breach in your infra, you can go on with the installation of source:

Then, you’ll have to change the rules defined in the rules file:

You must add this line –enable-command-args after –libdir=/usr/lib/nagios.
You should so get something like

Finally, you can compile your new configuration and install it:

Ensure you set the value for dont_blame_nrpe in /etc/nagios/nrpe.cfg (this is the default path, it can be different depending on your installation).

And here you go, you can now restart your NRPE server and send any nrpe commands.

  • Nov 21 / 2016
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Linux

Apache – mod_auth compatibility for 2.2 and 2.4

Since Apache 2.4, mod_auth changed and some directive like

that have been replaced with

If you want to automatically handle same configuration for multiple servers where different versions of Apache are installed, you can use this trick:

Thanks to that change, your configuration will be working whatever version of Apache you’re using.

  • Nov 07 / 2016
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Database

PostgreSQL – Check value is in array

With PostgreSQL, if you have a field containing an Array and you want to get all the results containing this value in the array, you can use the following command.

Here, we are looking for all the results in the table my_table containing my_value in the field my_array.

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