Yum corrupted on CentOS 6.2, Problem importing one the python modules.
 

Hello Guys,

After a sudden power outage on a server where CentOS 6.2 is installed i can no longer use Yum.

Whenever i run Yum i get the following:

I have google the error but had no luck.
Have anyone faced a similar problem before?
I'd appreciate any clues to help me dig deeper.
Thanks.

you are aware that 6.2 is not supported any longer
and that the centos "update" repo was moved to the historical "vault"

CentOS is currently only supporting 6.3 and the much older and current 5.8


it is recommended to upgrade
but yum is normally used

depending and that is a VERY big depending

depending on just when you last ran
you might have the very last updates installed
if so

you can try a force reinstall of that from the historical vault

but before you try you must make 100% sure that the last update is what you have installed

run this
You are running a 32 bit OS ( the "/lib/libldap" part )
http://vault.centos.org/6.2/updates/i386/Packages/

python-2.6.6-29.el6_2.2.i686.rpm
and ldap is in
http://vault.centos.org/6.2/os/i386/Packages/
python-ldap-2.3.10-1.el6.i686.rpm

IF those match the output of the what is installed ( the above rpm grep commands )

then force a reinstall
download the two
then
the
"python-2.6.6-29.el6_2.2.i686.rpm" may or may not need to be reinstalled


then you might want to upgrade to 6.3
this is a copy of the README "place-holder" in the 6.2 repo directory on the servers

Hello John,

Thank you very much for the detailed reply, i wasn't aware that version 6.2 is not supported anymore.
Also last time i ran yum update, if i did, would be months ago.

That said, there also seems to be a problem with rpm and its database.
I ran rpm -qa | grep python it didn't return anything, then i ran rpm -qa and instead of listing the packages it returned:

Then i downloaded couple of rpm's to try to install and i got:

I googled a little and tried rebuilding and initiating the rpm database i stil got the same result.

I tried a force install on an irrelevant package just to try and i got:

I hope it's not unrepairable, what do you think?

?"openldap-ltb-2.4.33-1.el6.i686.rpm "

that is not the one in the 6.2 vault , nor the 6.3 os repo

so you had installed openldap

that "key" error is you do not have the security key to check it

also from where did you get that rpm ?
the version in the centos 6.2 vault is "openldap-2.4.23-20.el6.i686.rpm"

if that different version IS what was installed
then you might want to read the rpm man page and the help page
you do not need to be root to read the two but you will need to be to install something

and use the "--nosignature" option
that dose not check if that rpm's security signature matches the the one on file on your computer

but the file you are trying to force install MUSTbe the exact same that was installed



if that dose not work you "can" ( last resort )
copy/paste the "libldap-2.4.so.2" after you extract it from the rpm

file-roller will extract the rpm format archive
you will get ( in the same folder )
a /lib folder

but you must be root to copy/paste it into /lib

Hello John,

Thanks again for your reply.
I downloaded the package openldap-2.4.23-20.el6.i686.rpm from the vault and i had to use --signature and --nodigest to overcome the signing problem.
But i got into another problem the dependencies as you can see below:

Aslo downloaded file-roller and had the same issue:

Now the weird thing is that the files it is complaining about DO exist but it seem like RPM is not able to see them.

What do you think?

# 5
Just guessing : Your OS is 64bits. Hence the missing 32bits packages.
I.e. use "x86_64" packages instead.

Verifying the architecture : $ uname -a

Hi Knudfl,

That's a 32-bit right?

That's 32bit alright ... you can try
which checks all files against the rpm db.
It'll tell you how bad the problem is I guess.

The first 2 or 3 items in each problem list are pretty fundamental files. If it can't them them you're pretty stuffed... :(

Is the system still doing its normal job ie is it just yum/rpm that can't see those files, or do normal operations also have the same problem?

Have you checked the perms & ownerships against a known good system?
The rpm cmd above should tell you a lot.
If you do need to fix perms/ownerships, see this http://www.cyberciti.biz/tips/reset-...ermission.html

Hello Chris,

Thanks for your reply.
rpm -Va doesn't return anything.

The server is operating normally besides rpm/yum, it runs a backup application and its still running fine. I found out about the problem when i wanted to install sendmail via yum and it gave me the initial error, then tried to use rpm and it wasn't working either.
I tried rebuilding and reinitiating the rpm database with no luck.

Also i seem to have a signature/Hash problem as any package i download fail...

Seems like rpm and yum don't know where the location of the file they need to run...

Hmm; I take it you didn't interrupt that cmd? Normally it'll flag at least a few files due to custom edits etc.
If it thinks ALL files are fine, but can't actually install/update anything, that's REALLY weird.

What about my qn re perms/ownerships; any way to check; did you read that link, it may help?

Theoretically anything is fixable, but I'd at least start thinking about forcing an OS upgrade to 6.3.
I hope it can backup itself...
Speaking of which, check a very recent backup ie since the problem started; they may or may not be valid...

Anything interesting in /var/log/yum.log?

Well i can't use rpm in any way since the simplest is rpm -qa that i supposed to list the packages and it returns:

What do you think about using fsck?

How can i force an upgrade to 6.3 when i can't use yum or rpm?

Unfortunately i don't have system backup.

Thanks,
Wassim.

there are two different instructions for that
one ( and i think you did this )
has you run "rm" on the rpm database file -- i never liked that
------------
cd /var/lib
rm __db*
-------------
my normal is ( using yum also )
if so there is no database to read

what happens if you run this

in an emergency ( and the procedure MIGHT kill the install so.....)
and you need to reboot


but this might kill the install if it is a mismatch

then reboot
cross your fingers

Hello John,

Yum is not working so when i issue yum clean all i get:

if i rebuild nothing happens:


What packages need replacement? rpm and yum and python?

/lib/libldap-2.4.so.2: undefined symbol: ber_sockbuf_io_udp