CHECK_NRPE: Error – Could not complete SSL handshake nagios
The nrpe uses the port no. 5666 to communicate . The same port no. must be opened in nagios server as well as in nagios client.
Usually we see the error “CHECK_NRPE: Error – Could not complete SSL handshake” .It is because nrpe works with ssl and this error tells that nrpe is not able to communicate because there is some SSL issue.
For resolving this issue. Install the ssl in both side nagios server and nagios client. Use the below given command to install openssl package
In CentOS or Red Hat
yum install openssl
In Debian or Ubuntu
sudo apt-get install openssl
Restart the nrpe in both system (nagios server and nagios client)
now check with check_nrpe .
Get the location where check_nrpe is there.
find / -name check_nrpe
You will find where the check_nrpe is located
Use the absolute path of check_nrpe and hit the below command.
In my system the path was /usr/lib/nagios/plugins/check_nrpe, hence I am using same.
/usr/lib/nagios/plugins/check_nrpe -H remote_server_ip
It will show the nrpe version. like this in below given command.
Remote server IP is 192.168.122.94
[root@localhost ~]# /usr/lib/nagios/plugins/check_nrpe -H 192.168.122.94