If you are using nagios in your hosting environment and need to install nrpe on your XenServer servers, here’s a good way to do it.
I’m using XenServer 6.1 (latest version).
First, install the epel repo and disable it by default:
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wget http://dl.fedoraproject.org/pub/epel/5/$(uname -i)/epel-release-5-4.noarch.rpm rpm -Uvh epel-release-*.rpm sed -i 's/enabled=1/enabled=0/g' /etc/yum.repos.d/epel.repo |
Next, install nrpe:
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yum install --enablerepo=epel nrpe |
If you get an error like this:
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Could not retrieve mirrorlist http://updates.vmd.citrix.com/XenServer/6.2.0/domain0/mirrorlist error was [Errno 14] HTTP Error 404: Not Found Cannot find a valid baseurl for repo: citrix |
Then disable the Citrix repo by changing ‘enabled=1’ to ‘enabled=0’ in /etc/yum.repos.d/Citrix.repo and try again.
Set it to start automagically on boot:
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chkconfig nrpe on |
Install Nagios plugins – these are some that we use..
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yum install --enablerepo=epel nagios-plugins-users nagios-plugins-disk nagios-plugins-swap nagios-plugins-procs nagios-plugins-load |
Next, add the following line to the iptables config just before the REJECT line at the bottom:
(Found here: /etc/sysconfig/iptables – this will allow your nagios server to connect to your XenServer)
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-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5666 -j ACCEPT |
Next, restart the firewall:
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service iptables restart |
Start nrpe:
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service nrpe start |
Edit the nrpe config file (/etc/nagios/nrpe.cfg) and take a look at the check commands at the bottom. If you have any questions about how to get it set up further feel free to comment on this post!
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Yes! Man, you are on a roll! I’ve been missing my alerts, and this post came right on time. Thank you so much for these no-muss, no fuss directions. I’m pretty new to server maintenance and I swear some of so-called “Easy to Follow” instructions that I find are written for rocket scientists.
Thanks for that. A very detailed and thorough explanation. I will give it a try using your guide and if I have any issues I wil post here for your help if you don’t mind. Very kind of you to offer to help anyone having trouble.