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--- linux:centos:nagios [27.07.2016 15:58]
vm vytvořeno
+++ linux:centos:nagios [02.08.2016 17:45]
vm
@@ Řádek 2: / Řádek 2: @@
 ===== NRPE =====
+==== Installation ====
 Add sources containing nagios packages:
@@ Řádek 25: / Řádek 26: @@
 Nagios plugins are located at ''/usr/lib64/nagios/plugins/'' folder.
-==== Source ====
+=== Source ===
   - [[https://kb.op5.com/pages/viewpage.action?pageId=17074187]]
+==== Problems ====
+=== CHECK_NRPE: Error - Could not complete SSL handshake. ===
+If you are recieving error like
+  CHECK_NRPE: Error - Could not complete SSL handshake.
+there are multiple reasons that can cause this error as this message is kind of generic error.
+Typical problems:
+  * Server from you are accessing NRPE is not listed in ''allowed_hosts'' directive on NRPE server.
+One of the tricky reasons that can cause this error is ''/etc/hosts.allow'' file. Even if you add server's IP in allowed_hosts, server cannot connect because this IP also needs to be listed in ''/etc/hosts.allow'' file by adding line:
+  nrpe: 10.10.10.10   monitoring-server.my-company.com
+There is no need to restart nrpe server.
+This is required as NRPE server on centos is compiled using ''tcp_wrappers'' library which parses this file.
+=== 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.
+  /usr/lib64/nagios/plugins/check_disk -w 10% -c 5% -X configfs -X cgroup -X tmpfs -X selinuxfs -X sysfs -X proc -X mqueue -X binfmt_misc -X devtmpfs
+Source:
+  * [[https://bugzilla.redhat.com/show_bug.cgi?id=1255948]]
+  * [[http://edvoncken.net/2012/01/workaround-for-nagios-check_disk-failure-in-rhel-centos-6-2/]]

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