i have installed centos6.4, after have yum update i cannot yum update again, there are some trouble as follows:

Traceback (most recent call last):
File "/usr/bin/yum", line 4, in <module>
import yum
File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 46, in <module>
import tempfile
File "/usr/lib/python2.6/tempfile.py", line 34, in <module>
from random import Random as _Random
File "/usr/lib/python2.6/random.py", line 873, in <module>
_inst = Random()
File "/usr/lib/python2.6/random.py", line 96, in __init__
self.seed(x)
File "/usr/lib/python2.6/random.py", line 110, in seed
a = long(_hexlify(_urandom(16)), 16)
OSError: [Errno 2] No such file or directory: '/dev/urandom'

can someone tell how to resolve this problem?
thanks

The problem reported is the /dev/urandom is not available on your system. Since that device is a kernel psudo-device, its absence suggests that you installation was not done correctly.

As superuser ("root"), try the command mknod -m 644 /dev/urandom c 1 9 to create the (psudo) device. (See man random for details.)

That might clear up your current problem, but I strongly suspect that you'll have additional problems until you re-install your system.

thank you for your advice, after following your advice, i try the command mknod -m 644 /dev/urandom c 1 9, then yum update again , there is not new error prompt.
i have installed centos 6.4 in my PC with DVD1 completely,but not DVD2, i have not met this kind of problem in previous veriosn.

now no error occurs with yum update.

thank you for your suggestion.

i met another question after calibrated the yum update error
when i fdisk -l, there showed the following prompt:


cannot open /proc/partitions

what's wrong with this?

when i enter in the /proc directory, there is nothing in it.

the dvd2 is normally not needed
it has src.rpms on it
for 99.999% of installs it is not needed

when you installed 6.4
did you use the "minimal" install ( no gui) as in no gnome desktop

or
the STD install installing Gnome

or

did you use a "custom" install and pick and chose what to install
This last is known to have possible problems
if you did this

reinstall with the default programs

then after you update
remove what you really do not need
( that should only be a very few things )

I think PTrenholme's last comment is likely correct..
Backup any important data and re-install is probably going to be quicker/simpler.