Yum not working

Yum should work out of the box: but it doesn't. On CentOS (Linux) you may see the following:

[root@yourservername etc]# yum update apcupsd
Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Could not find update match for apcupsd
No Packages marked for Update/Obsoletion


Add these to "/etc/yum.repos.d/CentOS-Base.repo":

[extras2]
name=Fedora Extras - $releasever - $basearch
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/6/$basearch/
gpgcheck=0
gpgkey=http://download.fedora.redhat.com/pub/fedora/linux/extras/RPM-GPG-KEY-Fedora-Extras


NOW, try it again:

[root@servername etc]# yum install apcupsd
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
extras2 100% |=========================| 1.1 kB 00:00
Reading repository metadata in from local files
primary.xml.gz 100% |=========================| 1.7 MB 00:11
################################################## 5211/5211
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for apcupsd to pack into transaction set.
apcupsd-3.12.4-5.fc6.i386 100% |=========================| 15 kB 00:00
---> Package apcupsd.i386 0:3.12.4-5.fc6 set to be updated
--> Running transaction check

Dependencies Resolved

=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
apcupsd i386 3.12.4-5.fc6 extras2 405 k

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

Total download size: 405 k
Is this ok [y/N]: y
Downloading Packages:
(1/1): apcupsd-3.12.4-5.f 100% |=========================| 405 kB 00:02
Running Transaction Test
warning: apcupsd-3.12.4-5.fc6: Header V3 DSA signature: NOKEY, key ID 1ac70ce6
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing: apcupsd ######################### [1/1]

Installed: apcupsd.i386 0:3.12.4-5.fc6
Complete!