yum install kernel
livna                     100% |=========================| 2.1 kB    00:00     
fedora                    100% |=========================| 2.1 kB    00:00     
ftp://fedora.glug-nith.org/linux/updates/8/i386/repodata/repomd.xml: [Errno 4] IOError: [Errno ftp error] 421 There are too many connected users, please try later.
Trying other mirror.
updates                   100% |=========================| 2.3 kB    00:00     
Setting up Install Process
Parsing package install arguments
Package kernel - 2.6.23.1-42.fc8.i586 is already installed.
Resolving Dependencies
--> Running transaction check
---> Package kernel.i586 0:2.6.23.15-137.fc8 set to be updated
---> Package kernel.i686 0:2.6.23.1-42.fc8 set to be updated
--> Finished Dependency Resolution
--> Running transaction check
---> Package kernel.i586 0:2.6.23.1-42.fc8 set to be erased
---> Package kernel.i586 0:2.6.23.15-137.fc8 set to be installed
---> Package kernel.i686 0:2.6.23.1-42.fc8 set to be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size 
=============================================================================
Installing:
 kernel                  i586       2.6.23.15-137.fc8  updates            16 M
 kernel                  i686       2.6.23.1-42.fc8  InstallMedia       16 M
Removing:
 kernel                  i586       2.6.23.1-42.fc8  installed          45 M

Transaction Summary
=============================================================================
Install      2 Package(s)         
Update       0 Package(s)         
Remove       1 Package(s)         

Total download size: 32 M