NOTE: Although this post references experiences I have had in work, the opinions expressed here are mine and mine alone.

If you follow me on Twitter you may have noticed my anti-RHEL (RedHat Enterprise Linux) outbursts today. I could keep twittering to try make my point, but sometimes 140 characters is just not enough, so I figured I’d blog about it instead and then tweet out the link to the blog post when I’m done.

In work we run two kinds of Linux servers, RedHat Enterprise Linux, and CentOS. We pay for RedHat, we don’t pay for CentOS (because it’s free). CentOS is based off the RedHat code base, but has some of the fancy stuff stripped out. Clearly, you would expect RHEL to give you the better experience since it has more features and you pay for support. Unfortunately, in my experience that’s just not how things are shaping up. CentOS has been completely problem and stress free (as well as financially free), while RHEL has not been such a smooth ride. Sure, most of the time it works just fine, but it definitely generates more stress for me than CentOS does, and that’s paid-for stress!

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I’m pretty sure this is useless on most versions of Linux because the default DHCP plugin that comes with the Nagios Plugins distribution has this functionality and seems to work just fine everywhere except on RedHat-based distros like RHEL, Centos and Fedora Core. On these systems the default plugin does not seem to work and fails to detect any DHCP servers. This plugin is different to the one I gave instructions for before which tests whether a particular DHCP server is answering requests, this plugin finds rogue servers, it will not alert you if any of your actual DHCP servers are down. Hence, you should probably install both. This plugin is not very polished, it is rough and ready but I know it works on RHEL4. If you’re running a different system you may have to do some minor tweaks but this should serve as an excellent starting point none-the-less.

[tags]Nagios, DHCP, RedHat, RHEL, CentOS, Fedora, Linux[/tags]

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