Applications developed in the C programming language can use dynamic libraries (.so files) to reuse common functions and symbols in the binary. When the library changes its soname in a major version, the binaries normally need to be rebuilt for the new system. Some libraries have not changed their soname between CentOS 6 and CentOS 7 so it could be possible to reuse third party applications which use only these libraries without rebuilding.

You can find the list of the unchanged dynamic libraries and their package names in the following file: [link:./kickstart/NoSonameBumpLibs]

If it is not clear what libraries the third party binary or RPM uses, it is possible to use the ldd utility for the C binary, or run the "rpm -q --whatrequires SONAME" command for the whole RPM package. No problems are expected to occur if there are only .so files listed in the NoSonameBumpLibs file and unversioned shared libraries.