Posts Tagged “mongosniff”

Lately I’ve worked with mongoDB which is a great NoSQL database. A tool which can come in handy is mongosniff, which comes with mongodb binaries. Mongosniff is something like tcpdump for TCP/IP.

On my Fedora 16 x86_64 System I’m running mongodb binaries available from mongodb, this allows me to easily run the version I want. But mongosniff didn’t worked right out the box for it. When starting mongosniff I got following error: mongosniff: error while loading shared libraries: libpcap.so.0.9: cannot open shared object file: No such file or directory.  So this mostly means that libpcap isn’t installed, but this wasn’t the case as you can see in a minute.

My first try was to install libpcap for my system but this didn’t solve the problem. A lookup with ldd showed that indeed libpcap.so.0.9 was missing for it:

       linux-vdso.so.1 =>  (0x00007fffa30d2000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003ef0400000)
        libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003655a00000)
        libpcap.so.0.9 => not found
        libm.so.6 => /lib64/libm.so.6 (0x0000003ef1000000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003654600000)
        libc.so.6 => /lib64/libc.so.6 (0x0000003ef0000000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003eefc00000)

A check if any libpcap module was available showed that a too new version was installed and that a symlink as libpcap.so.0.9 was missing:

ls /usr/lib64/libpcap*
/usr/lib64/libpcapnav.so        /usr/lib64/libpcapnav.so.0
/usr/lib64/libpcap.so.1         /usr/lib64/libpcapnav.so.0.0.0
/usr/lib64/libpcap.so.1.1.1     /usr/lib64/libpcap.so

So creating a symlink for libpcap.so.0.9 solved the startup problem: ln -s /usr/lib64/libpcap.so.1.1.1 /usr/lib64/libpcap.so.0.9. If you’re running a 32bit mongodb version you may check your /usr/lib to see if the required libpcap is missing. Don’t know if this problem still exists if you’re running mongodb from the offical repositoy.

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Tags: 64bit, fedora 16, libpcap, mongosniff

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