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Nagios in CentOS
NRPE
Installation
Add sources containing nagios packages:
yum install epel-release
Install NRPE and the plugins that is required to add the services via the function „Add UNIX client services“ when adding a new host in the configuration UI in op5 Monitor
yum install nrpe nagios-plugins-users nagios-plugins-load nagios-plugins-swap nagios-plugins-disk nagios-plugins-procs
Create custom configuration as .cnf file at /etc/nrpe.d/
allowed_hosts=127.0.0.1,10.0.0.10
Restart the nrpe agent on the host, and make sure that nrpe is started at boot: CentOS/RHEL 6:
service nrpe restart chkconfig nrpe on
CentOS/RHEL 7:
systemctl restart nrpe systemctl enable nrpe
Nagios plugins are located at /usr/lib64/nagios/plugins/
folder.
Source
Problems
Nagios check_disk failure in RHEL / CentOS 6.2
If NRPE is responding with
DISK UNKNOWN - free space:|
on CentOS 6 or with
DISK CRITICAL - /sys/kernel/config is not accessible: Permission denied
CentOS 7, there is issue with SElinux policy.
There are also related entries in /var/log/audit/audit.log
.
Since version 6.2, the Nagios check_disk
plugin is not working with Permission denied
errors. This problem is related to the SElinux policy.
Fortunately, there is a simple workaround while we wait for an updated selinux-policy package. As root, do the following:
chcon -t nagios_unconfined_plugin_exec_t /usr/lib64/nagios/plugins/check_disk
If you do not want change SElinux policy, another workaround is to exclude offending file systems using -X flags in check definition.
- X configfs -X cgroup -X tmpfs -X selinuxfs -X sysfs -X proc -X mqueue -X binfmt_misc -X devtmpfs
Source: