NetWorker: httpd -v returns "error while loading shared libraries: cannot open shared object file"

On a Linux NetWorker Management Console (NMC) server, the NMC httpd -V is used to show the Apache version used by the NMC's httpd process. 

The httpd -V command returns an error stating: 

./httpd: error while loading shared libraries: libaprutil-1.so.0: cannot open shared object file: No such file or directory

Example:

[root@lnx-srvr02 bin]# cd /opt/lgtonmc/apache/bin
[root@lnx-srvr02 bin]# ./httpd -v -f /opt/lgtonmc/apache/conf/httpd.conf
./httpd: error while loading shared libraries: libaprutil-1.so.0: cannot open shared object file: No such file or directory
[root@lnx-srvr02 bin]#

The NMC installation includes its own library files under /opt/lgtonmc/apache/lib/; however, httpd is only checking the operating system library files. For example: /lib64 or /usr/lib64

When using the ldd command, the missing library files can be identified along with what library path is used for the available library files:

ldd /opt/lgtonmc/apache/bin/httpd

For Example:

[root@lnx-srvr02 bin]# ldd /opt/lgtonmc/apache/bin/httpd
        linux-vdso.so.1 (0x00007fffbd3fb000)
        libpcre.so.1 => /lib64/libpcre.so.1 (0x00007ff78375a000)
        libaprutil-1.so.0 => not found
        libexpat.so.0 => not found
        libapr-1.so.0 => not found
        libuuid.so.1 => /lib64/libuuid.so.1 (0x00007ff783552000)
        librt.so.1 => /lib64/librt.so.1 (0x00007ff78334a000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007ff783121000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ff782f01000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007ff782cfd000)
        libc.so.6 => /lib64/libc.so.6 (0x00007ff782927000)
        /lib64/ld-linux-x86-64.so.2 (0x00007ff7839cb000)

Temporary:

Set the LD_LIBRARY_PATH environment variable to include the /opt/lgtonmc/apache/lib path. Example:

[root@lnx-srvr02 ~]# LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/lgtonmc/apache/lib
[root@lnx-srvr02 ~]# export LD_LIBRARY_PATH
[root@lnx-srvr02 ~]#
[root@lnx-srvr02 ~]# ldd /opt/lgtonmc/apache/bin/httpd
        linux-vdso.so.1 (0x00007fffd2b37000)
        libpcre.so.1 => /opt/lgtonmc/apache/lib/libpcre.so.1 (0x00007ff74acb6000)
        libaprutil-1.so.0 => /opt/lgtonmc/apache/lib/libaprutil-1.so.0 (0x00007ff74aa8f000)
        libexpat.so.0 => /opt/lgtonmc/apache/lib/libexpat.so.0 (0x00007ff74a86d000)
        libapr-1.so.0 => /opt/lgtonmc/apache/lib/libapr-1.so.0 (0x00007ff74a636000)
        libuuid.so.1 => /lib64/libuuid.so.1 (0x00007ff74a42e000)
        librt.so.1 => /lib64/librt.so.1 (0x00007ff74a226000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007ff749ffd000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ff749ddd000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007ff749bd9000)
        libc.so.6 => /lib64/libc.so.6 (0x00007ff749803000)
        /lib64/ld-linux-x86-64.so.2 (0x00007ff74aed3000)
[root@lnx-srvr02 ~]#
[root@lnx-srvr02 ~]# /opt/lgtonmc/apache/bin/httpd -v -f /opt/lgtonmc/apache/conf/httpd.conf
Server version: Apache/2.4.55 (Unix)
Server built:   Mar 27 2023 23:41:51
[root@lnx-srvr02 ~]#

Once the session is closed, these settings are removed. 

Permanent:

One of the following methods can be used. The method used is preferential. 

1. Copy the missing library files from /opt/lgtonmc/apache/lib to the operating system library location. For example:

[root@lnx-srvr02 ~]# cp /opt/lgtonmc/apache/lib/libaprutil-1.so.0 /lib64/libaprutil-1.so.0
[root@lnx-srvr02 ~]# cp /opt/lgtonmc/apache/lib/libexpat.so.0 /lib64/libexpat.so.0
[root@lnx-srvr02 ~]# cp /opt/lgtonmc/apache/lib/libapr-1.so.0 /lib64/libapr-1.so.0
[root@lnx-srvr02 ~]#
[root@lnx-srvr02 ~]# ldd /opt/lgtonmc/apache/bin/httpd
        linux-vdso.so.1 (0x00007ffe64f98000)
        libpcre.so.1 => /lib64/libpcre.so.1 (0x00007ffa85e24000)
        libaprutil-1.so.0 => /lib64/libaprutil-1.so.0 (0x00007ffa85bfd000)
        libexpat.so.0 => /lib64/libexpat.so.0 (0x00007ffa859db000)
        libapr-1.so.0 => /lib64/libapr-1.so.0 (0x00007ffa857a4000)
        libuuid.so.1 => /lib64/libuuid.so.1 (0x00007ffa8559c000)
        librt.so.1 => /lib64/librt.so.1 (0x00007ffa85394000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007ffa8516b000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ffa84f4b000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007ffa84d47000)
        libc.so.6 => /lib64/libc.so.6 (0x00007ffa84971000)
        /lib64/ld-linux-x86-64.so.2 (0x00007ffa86095000)
[root@lnx-srvr02 ~]#
[root@lnx-srvr02 ~]# /opt/lgtonmc/apache/bin/httpd -v -f /opt/lgtonmc/apache/conf/httpd.conf
Server version: Apache/2.4.55 (Unix)
Server built:   Mar 27 2023 23:41:51
[root@lnx-srvr02 ~]#

2. Create a symbolic link for the library file pointing to the /opt/lgtonmc/apache/lib path. For example:

[root@lnx-srvr02 ~]# ln -s /opt/lgtonmc/apache/lib/libaprutil-1.so.0 /lib64/libaprutil-1.so.0
[root@lnx-srvr02 ~]# ln -s /opt/lgtonmc/apache/lib/libexpat.so.0 /lib64/libexpat.so.0
[root@lnx-srvr02 ~]# ln -s /opt/lgtonmc/apache/lib/libapr-1.so.0 /lib64/libapr-1.so.0
[root@lnx-srvr02 ~]#
[root@lnx-srvr02 ~]# ls -l /lib64/libaprutil-1.so.0
lrwxrwxrwx 1 root root 41 Oct 30 15:23 /lib64/libaprutil-1.so.0 -> /opt/lgtonmc/apache/lib/libaprutil-1.so.0
[root@lnx-srvr02 ~]# ls -l /lib64/libexpat.so.0
lrwxrwxrwx 1 root root 37 Oct 30 15:23 /lib64/libexpat.so.0 -> /opt/lgtonmc/apache/lib/libexpat.so.0
[root@lnx-srvr02 ~]# ls -l /lib64/libapr-1.so.0
lrwxrwxrwx 1 root root 37 Oct 30 15:23 /lib64/libapr-1.so.0 -> /opt/lgtonmc/apache/lib/libapr-1.so.0
[root@lnx-srvr02 ~]#
[root@lnx-srvr02 ~]# ldd /opt/lgtonmc/apache/bin/httpd
        linux-vdso.so.1 (0x00007fffd85c7000)
        libpcre.so.1 => /lib64/libpcre.so.1 (0x00007fca31576000)
        libaprutil-1.so.0 => /lib64/libaprutil-1.so.0 (0x00007fca3134f000)
        libexpat.so.0 => /lib64/libexpat.so.0 (0x00007fca3112d000)
        libapr-1.so.0 => /lib64/libapr-1.so.0 (0x00007fca30ef6000)
        libuuid.so.1 => /lib64/libuuid.so.1 (0x00007fca30cee000)
        librt.so.1 => /lib64/librt.so.1 (0x00007fca30ae6000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fca308bd000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fca3069d000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007fca30499000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fca300c3000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fca317e7000)
[root@lnx-srvr02 ~]#
[root@lnx-srvr02 ~]# /opt/lgtonmc/apache/bin/httpd -v -f /opt/lgtonmc/apache/conf/httpd.conf
Server version: Apache/2.4.55 (Unix)
Server built:   Mar 27 2023 23:41:51

NetWorker Linux: Unable to Launch NMC. Cannot connect to NMC server 9000 port