NRPE Agent

[matson-itops]

Can someone kindly point me to documentation ?
I would like a like of NRPE agents compatiable with NagiosXI 5.8.1

I have a nagiosxi 5.8.1 on redhat 8 and am running into issues talking to a box with nrpe v2.15
The error I get is "CHECK_NRPE: (ssl_err != 5) Error - Could not complete SSL handshake".

I have no problems talking to another box with INRPE v3.2.1

[benjaminsmith]

Hi @matson-itops,

That's a common issue, and we have a kb article to help troubleshoot it.

NRPE - CHECK_NRPE: Error - Could Not Complete SSL Handshake

Check the allowed hosts setting in nrpe.cfg first and then make sure you have SSL compiled. Let us know if you're able to resolve it.

Benjamin

[matson-itops]

We gave up and upgraded the nagios agent.

But now have a new issue
we're installing version 4.0.2 install is failing on redhat 7.9 boxes for A-subcomponents / nagiosplugins
when using Nagios Linux Agent Installer Script v2.1.1 from you guys we get the following error :

Making install in plugins
make[1]: Entering directory `/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins'
/bin/sh ../libtool --tag=CC --mode=link gcc -DNP_VERSION='"2.3.3"' -g -O2 -L. -L/usr/local/lib -o check_http check_http.o libnpcommon.a ../lib/libnagiosplug.a ../gl/libgnu.a -lssl -lcrypto libnpcommon.a ../lib/libnagiosplug.a ../gl/libgnu.a -lssl -lcrypto -lnsl -lresolv -lpthread -ldl
libtool: link: gcc -DNP_VERSION=\"2.3.3\" -g -O2 -o check_http check_http.o -L. -L/usr/local/lib libnpcommon.a ../lib/libnagiosplug.a ../gl/libgnu.a -lssl -lcrypto -lnsl -lresolv -lpthread -ldl
libnpcommon.a(sslutils.o): In function `np_net_ssl_init_with_hostname_version_and_cert':
/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins/sslutils.c:150: undefined reference to `TLS_client_method'
/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins/sslutils.c:176: undefined reference to `SSL_CTX_set_options'
/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins/sslutils.c:107: undefined reference to `TLS_client_method'
/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins/sslutils.c:154: undefined reference to `OPENSSL_init_ssl'
/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins/sslutils.c:155: undefined reference to `OPENSSL_init_ssl'
/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins/sslutils.c:156: undefined reference to `OPENSSL_init_crypto'
libnpcommon.a(sslutils.o): In function `np_net_ssl_check_cert_real':
/tmp/linux-nrpe-agent/subcomponents/nagiosplugins/nagios-plugins-2.3.3/plugins/sslutils.c:282: undefined reference to `X509_getm_notAfter'
collect2: error: ld returned 1 exit status

[ssax]

Do you have openssl-devel installed? If not, try installing it first and then run it again:

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yum install openssl-devel

If it is already installed, send the output of this command on the remote system:

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rpm -qa | grep openssl

Thank you!

[matson-itops]

tis already installed

[dummy@xxx ~]$ rpm -qa | grep openssl
openssl-libs-1.0.2k-21.el7_9.x86_64
openssl-devel-1.0.2k-21.el7_9.x86_64
openssl-1.0.2k-21.el7_9.x86_64

[vtrac]

Hi,
I think you might have TWO openssl installed.

you should be using the "-I/usr/include" and "-L/usr/lib" not "-I/usr/local/include" and "-l/usr/local/lib" during the make.

Can you please check:

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ls -l /usr/local/include/ssl.h

ls -l /usr/include/ssl.h

Also, please do:

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ls -l /usr/local/lib/

I'm thinking those under "/usr/local/include" and "/usr/local/lib" should be removed since they might belong to some python modules.

One thing you could try, if you don't want to remove those two folders is to rename them temporary:

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mv -f /usr/local/include /usr/local/include_keep

mf -f /usr/local/lib/ /usr/local/lib_keep

Now, re-run the install with new "./configure" to pull in correct "/usr/include" and "/usr/lib" path.
So, let clean up the old "linux-nrpe-agent" under "/tmp":

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cd /tmp

rm -rf linux-nrpe-agent

wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz

tar xzf linux-nrpe-agent.tar.gz

cd linux-nrpe-agent

./fullinstall

Please upload the install.log when completed, only if there is issue!!


Regards,
Vinh