At Fri, 24 Sep 2010 09:15:58 -0700 CentOS mailing list centos@centos.org wrote:

Is there a way to identify if an rpm package is unused, or how much it is used?

I would like to reduce my load time by removing unused packages in my kickstart, but do not want to cause problems for users on active systems by guessing which ones are not necessary (I load everything with kickstart now). If I could find the packages are not used I could start by excluding them from a load and be fairly certain my users would not be impacted.

rpm -q --whatrequires will show what packages depend on a given package:

sauron.deepsoft.com% rpm -q --whatrequires gcc gcc-c++-4.1.2-48.el5 gcc-java-4.1.2-48.el5 gcc-gfortran-4.1.2-48.el5 apr-devel-1.2.7-11.el5_5.2 apr-devel-1.2.7-11.el5_5.2 sauron.deepsoft.com% rpm -q --whatrequires gcc-c++ no package requires gcc-c++ sauron.deepsoft.com% rpm -q --whatrequires gcc-gfortran

I *could* remove gcc-c++, expect that I frequently compile C++ programs...

Unless you ask your users, you won't know what packages/programs they are actually using...

Presumably, you should have some idea of this already: are your users office workers or computer programmers? If office workers what sorts of office productivity stuff do they do (write text documents, create bar charts, create presentations, etc.)? If computer programmers, which programming languages do they use? Do they use an IDE or make? Automake, autoconf, etc.? Debuggers?

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Is there documentation on creating a netinstall image? I need to create a netinstall image that will work with an original RedHat distribution (I would prefer to work in CentOS too, but I have been asked to use RedHat).