Nagios CentOS install
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[root@merkur tmp]# <input>yum update</input>
[root@merkur tmp]# <input>rpm -Uhv http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm</input>
[root@merkur tmp]# <input>yum clean all</input>
[root@merkur tmp]# <input>yum install nagios nagios-plugins nagios-plugins-nrpe nagios-devel</input>