Check nrpe don't work with libssl.so.10 problem

[davide.bonicelli]

Hi, i have a Nagios Core installed on a Centos 7.6.1810 x64, when i try to use nrpe check i have this error:

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/usr/local/nagios/libexec/check_nrpe: error while loading shared libraries: libssl.so.10: cannot open shared object file: No such file or directory

I already tried to reinstall plugin, to reinstall plugin from source, to make some link i have found on others forum but nothing..and this is a very big problem for me

also openssl is installed

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[root@nagios nagios]# which openssl
/usr/bin/openssl

any idea?

[scottwilkerson]

Was this check_nrpe compiled on this server or did you move it from a different server?
do you have openssl-libs installed?

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yum install openssl-libs

[davide.bonicelli]

I have compiled check_nrpe from source and yes, the lib is installed

[scottwilkerson]

I have compiled check_nrpe from source and yes, the lib is installed

but did you compile it on the server it is erroring on?

[davide.bonicelli]

Yes, i compiled It on the nagios server which It Is the same server that report me the error when i launch
/usr/local/nagios/libexec/check_nrpe

[scottwilkerson]

lets run the following to see where it thinks the file is supposed to be

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ldd /usr/local/nagios/libexec/check_nrpe

And where the file actually exists

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find / -name libssl.so.10

[davide.bonicelli]

here is the response, thanks

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[root@nagios ~]# ldd /usr/local/nagios/libexec/check_nrpe
        linux-gate.so.1 =>  (0xf773e000)
        libssl.so.10 => not found
        libcrypto.so.10 => not found
        libnsl.so.1 => /lib/libnsl.so.1 (0xf7718000)
        libc.so.6 => /lib/libc.so.6 (0xf754d000)
        /lib/ld-linux.so.2 (0xf773f000)
[root@nagios ~]# find / -name libssl.so.10
/usr/lib64/libssl.so.10
[root@nagios ~]# yum install openssl-libs
Plugin abilitati:fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.prometeus.net
 * epel: pkg.adfinis-sygroup.ch
 * extras: mirrors.prometeus.net
 * updates: mirrors.prometeus.net
Il pacchetto 1:openssl-libs-1.0.2k-16.el7_6.1.x86_64 è già installato e aggiornato all'ultima versione

and if i do a

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ln -sf /usr/lib64/libssl.so.10 /usr/lib/

the error is this
libexec/check_nrpe: error while loading shared libraries: libssl.so.10: wrong ELF class: ELFCLASS64

[davide.bonicelli]

ps
i followed this guide to compile the plugins:
https://support.nagios.com/kb/article.php?id=515

[scottwilkerson]

ps
i followed this guide to compile the plugins:
https://support.nagios.com/kb/article.php?id=515

I would suggest re-compiling for some reason your server cannot find several linked libraries that were found when it was compiled in the beginning.

Be sure you have all these before you start

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yum install -y gcc glibc glibc-common openssl openssl-devel perl wget

[davide.bonicelli]

Hi Scott, i already have all library installed and i already tried to recompile the plugins more than one time (or 2, or 3..) without luck..but!
now i copied the file check_nrpe from another nagios installation on a 64bit centos and..it works!