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===How can I get yum to keep package "foo" at a certain version in a fashion similar to pinning provided by apt?===

There are several ways you can do this.

*One is to exclude it from your updates list. See man yum.conf for more details. 
*Another way to pin package "foo" to a certain version is to use the versionlock plugin. 

'''If you are using the latest Fedora ( version >= 12)'''

then the plugin can be installed using:

 yum install yum-plugin-versionlock

To add files that you want version locked, use the following yum command:

 yum versionlock <package-name>

you can also use wildcards:

 yum versionlock <package-name>-*

This command line will add lines to:

 /etc/yum/pluginconf.d/versionlock.list

The config file uses the following format: EPOCH:NAME-VERSION-RELEASE.ARCH which can be obtained using:

 rpm -q <nowiki><package name> --queryformat "%{EPOCH}:%{NAME}-%{VERSION}-%{RELEASE}\n "</nowiki>

If no EPOCH is specified in the package, then the number will be 0.

'''Alternatively if you are using Redhat 5/CentOS 5 or another OS that does not yet have the latest yum available'''

you can use:

 yum install yum-versionlock

This older version of the plug-in does not extend command line flags that you can pass to yum and the lock list must be edited manually.

For a manual install the source can be obtained from the current git repository for yum which is http://yum.baseurl.org/gitweb The files you need will be found in the yum-utils/plugins/versionlock part of the git tree. Copy <path>versionlock.py</path> to <path>/usr/lib/yum-plugins/versionlock.py</path> Copy versionlock.conf to /etc/yum/pluginconf.d/versionlock.conf Create <path>/etc/yum/pluginconf.d/versionlock.list</path> All files should be root.root with 644 permissions.