Yum update from specific repository

To run your yum packages updates from a specific yum repo you need to list your installed repo IDs by issuing this command:

# yum repolist
Which generates the example output below (obviously depends on what repos you have installed):

repo id                        repo name  
base                           CentOS-5 - Base
epel                           Extra Packages for Enterprise Linux 5 - x86_64  
extras                         CentOS-5 - Extras  
ius                            IUS Community Packages for Enterprise Linux 5 - x86_64  
rpmforge                       RHEL 5 - RPMforge.net - dag  
updates                        CentOS-5 - Updates      

Then you can force yum to ignore all repos except the one you need (the IUS repo in this example) to list its available packages by issuing the following:

yum --disablerepo="*" --enablerepo="ius" list available


Which returns available packages that are only in that particular repo

 Loaded plugins: fastestmirror, replace, security  
 Loading mirror speeds from cached hostfile  
  * ius: archive.linux.duke.edu  
 Excluding Packages in global exclude list  
 Finished  
 Available Packages  
 autoconf26x.noarch                                      2.63-4.ius.el5                               ius  
 mysql50.x86_64                                        5.0.96-2.ius.el5                              ius  
 mysql50-bench.x86_64                                     5.0.96-2.ius.el5                              ius  
 mysql50-debuginfo.x86_64                                   5.0.96-2.ius.el5                              ius  
 mysql50-devel.x86_64                                     5.0.96-2.ius.el5                              ius  
 mysql50-server.x86_64                                     5.0.96-2.ius.el5                              ius  
 mysql51.x86_64                                        5.1.63-1.ius.el5                              ius  
 mysql51-bench.x86_64                                     5.1.63-1.ius.el5                              ius  
 mysql51-debuginfo.x86_64                                   5.1.63-1.ius.el5                              ius  
 mysql51-devel.x86_64                                     5.1.63-1.ius.el5                              ius  
 mysql51-embedded.x86_64                                    5.1.63-1.ius.el5                              ius  

You can replace the yum option "list available" used above by any of yum's command options like  update, install etc..

For example, installing the rsyslog package from the IUS repo:

 yum --disablerepo="*" --enablerepo="ius" install rsyslog4  
 Loaded plugins: fastestmirror, replace, security  
 Loading mirror speeds from cached hostfile  
  * ius: archive.linux.duke.edu  
 Excluding Packages in global exclude list  
 Finished  
 Setting up Install Process  
 Resolving Dependencies  
 --> Running transaction check  
 ---> Package rsyslog4.x86_64 0:4.8.0-1.ius.el5 set to be updated  
 --> Finished Dependency Resolution  
 Dependencies Resolved  
 ============================================================================================================================================================================  
  Package                 Arch                  Version                     Repository              Size  
 ============================================================================================================================================================================  
 Installing:  
  rsyslog4                 x86_64                 4.8.0-1.ius.el5                 ius                 446 k  
 Transaction Summary  
 ============================================================================================================================================================================  
 Install    1 Package(s)  
 Upgrade    0 Package(s)  
 Total download size: 446 k