Jonathan Hoser wrote: % Hi all, % % this is might be only on the sidelines be related to spacewalk, but I % thought I'd try anyhow: % % I'm hunting down a bug which currently causes to instant-crash (for % users, not root!) on boxes that I just kickstarted from Spacewalk based % on the very latest Fedora16 x64 repos. % % Thinking about some package issue with Thunderbird I completely replaced % the relevant binaries /usr/lib64/thunderbird/* with those from a (also % SW-kickstarted) F16 x64 system where TB works. % To no avail. % % Then I went looking at the system-libs in /lib64 and started to % comparing, where I came across the following: % % Yesterday I kickstarted 5 F16 boxes, and I would have expected the % contents of /lib64 to be bit-identical. % But a checksumming (md5, sha, sha256 - all tested to be sure) differed % for *each* file in /lib64 on *each* host. % Do you see that too? Is this to be expected? % If so - why?
Yes, it's expected. The magic behind it is called 'prelink'. See http://en.wikipedia.org/wiki/Prelink Better way to verify whether you binaries and libraries are ok (i.e. they are the ones installed by rpm package) is rpm -Vvf /lib64/libz.so on each of the systems. % If not - ??? % % If the answer is obvious, please say so, but a few hours of googling % around haven't turned up anything useful.... % % The underlying repos might have seen ~3 repo-syncs - but only on % F16-updates repo, and surely not the base-repo (synced once a day). % % Sadly enough I don't have manually - from DVD - installed boxes around % any more to check the behaviour on those; % % Example: % [me@host ~]$ grep -r "libz.so" *_lib64.md5 % 217-111.DOMAIN.de_lib64.md5:e088a34f45b22c64ccf78f2d1b6b1f50 % /lib64/libz.so.1.2.5 % 217-168.DOMAIN.de_lib64.md5:b3e0068f7e74895c2100ed36e84e6799 % /lib64/libz.so.1.2.5 ... % Script to test is stupid easy, relies on nfs drive to collect the data. % hosts="hosta hostb hostc" % for i in $hosts; do echo "Host: ${i}"; ssh ${i} 'md5sum /lib64/* > % /path/to/nfs/${HOSTNAME}_lib64.md5'; done % % I'm really looking forward to answers - % and if it's only to verify I'm not going completely nuts... % % Best % -Jonathan Regards, -- Michael Mráka Satellite Engineering, Red Hat _______________________________________________ Spacewalk-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/spacewalk-list
