use of "ldd" in live production server

Amrita@3086 · 03-29-2007, 01:09 AM

Hi,
I am new to solaris.
Can we use ldd command on live production server
please help me out.

vermaden · 03-29-2007, 01:13 AM

Yes, why not?

ldd just tells You which libraries are needed for specific binary:

Code:

% ldd `which fluxbox`
/usr/local/bin/fluxbox:
        libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x2819c000)
        libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x281a6000)
        libiconv.so.3 => /usr/local/lib/libiconv.so.3 (0x281c0000)
        libXft.so.2 => /usr/X11R6/lib/libXft.so.2 (0x282b0000)
        libfontconfig.so.1 => /usr/X11R6/lib/libfontconfig.so.1 (0x282c9000)
        libexpat.so.6 => /usr/local/lib/libexpat.so.6 (0x282f7000)
        libXrender.so.1 => /usr/X11R6/lib/libXrender.so.1 (0x2831a000)
        libXpm.so.4 => /usr/X11R6/lib/libXpm.so.4 (0x28324000)
        libImlib2.so.4 => /usr/local/lib/libImlib2.so.4 (0x2833a000)
        libfreetype.so.9 => /usr/local/lib/libfreetype.so.9 (0x283b4000)
        libz.so.3 => /lib/libz.so.3 (0x28437000)
        libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x28448000)
        libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x2852d000)
        libXrandr.so.2 => /usr/X11R6/lib/libXrandr.so.2 (0x2853d000)
        libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x28541000)
        libm.so.4 => /lib/libm.so.4 (0x28617000)
        libc.so.6 => /lib/libc.so.6 (0x2862d000)

It is VERY useful in server environment to check for example which libraries are needed by apache to copy them to chroot environment to make it work correctly.

Amrita@3086 · 03-29-2007, 01:32 AM

Thanks Vermaden,

$ ldd bin/engine
libCNTI.so => /opt/CommerceLink/clnkvisa/lib/libCNTI.so
libopenssl.so => /opt/CommerceLink/clnkvisa/lib/libopenssl.so
libcssl.so => /opt/CommerceLink/clnkvisa/lib/libcssl.so
libiodbc.so.2 => /usr/local/lib/libiodbc.so.2
libsocket.so.1 => /usr/lib/libsocket.so.1
libnsl.so.1 => /usr/lib/libnsl.so.1
libdl.so.1 => /usr/lib/libdl.so.1
libstdc++.so.2.8.1.1 => /usr/lib/libstdc++.so.2.8.1.1
libm.so.1 => /usr/lib/libm.so.1
libc.so.1 => /usr/lib/libc.so.1
libmp.so.2 => /usr/lib/libmp.so.2
/usr/platform/SUNW,Ultra-4/lib/libc_psr.so.1

here libCNTI.so is pointing to /opt/CommerceLink/clnkvisa/lib/libCNTI.so
but according to our application it should point to some other object
like libCNTIbbk.bm.so

is it possible that ldd is not pointing to correct .so file
can you please help me out ?

jlliagre · 03-29-2007, 02:13 AM

If it points to an unexpected library, then the reason could be a messed LD_LIBRARY_PATH, however, libCNTI.so cannot point to a library with a different name, like libCNTIbbk.bm.so.

Amrita@3086 · 03-29-2007, 02:33 AM

hi,
bin/engine is suppose to use
libCNTIbbk.bm.so, but

after running
$ldd bin/engine
It is showing that is using libCNTI.so

Is there any way to find ?"libCNTIbbk.bm.so" library is used
by which executable

Thans in advance.

vermaden · 03-29-2007, 05:09 AM

Quote:

Originally Posted by Amrita@3086

here libCNTI.so is pointing to /opt/CommerceLink/clnkvisa/lib/libCNTI.so
but according to our application it should point to some other object like libCNTIbbk.bm.so

is it possible that ldd is not pointing to correct .so file
can you please help me out ?

check Your /etc/ld.so.conf for libCNTIbbk.bm.so and libCNTI.so:

Code:

% grep 'libCNTIbbk.bm.so\|libCNTI.so' /etc/ld.so.conf

also check if libCNTI.so is not only a symlink:

Code:

% ls -l /opt/CommerceLink/clnkvisa/lib/libCNTI.so

vermaden · 03-29-2007, 05:16 AM

Quote:

Originally Posted by Amrita@3086

Is there any way to find ?"libCNTIbbk.bm.so" library is used by which executable

like that for example:

Code:

% for binary in /bin/* /sbin/* /usr/local/bin/* /usr/local/sbin/* /put/other/path/here/bin/* ;do if [ ! $(ldd `which ${binary}` | grep -q libCNTIbbk.bm.so) ]; then echo ${binary} ;fi ;done

bathory · 03-29-2007, 05:56 AM

[QUOTE=vermaden]check Your /etc/ld.so.conf for libCNTIbbk.bm.so and libCNTI.so:

Code:

% grep 'libCNTIbbk.bm.so\|libCNTI.so' /etc/ld.so.conf

Unlike linux there is no /etc/ld.so.conf in solaris. There is

Code:

crle

to view and set the path to the various libraries

Regards

vermaden · 03-29-2007, 06:40 AM

Quote:

Originally Posted by bathory

Unlike linux there is no /etc/ld.so.conf in solaris. There is

Code:

crle

to view and set the path to the various libraries

Good to know, I do not use Linux either, maybe sometimes under /usr/compat/linux