Some notes I kept when I was learning how to use
Installing a package that has been excluded
/etc/yum.conf may contain an 'excludes' line that will disallow updates of any of packages listed. To bypass this, you can comment out those packages in
/etc/yum.conf, or you can one-off it like this:
yum --disableexcludes all install gcc
Finding which repo has the file you need
yum provides '*apxs*'
You may need to add '--disableexcludes all' too.
Listing the files in a package
repoquery --list apache
Using a specific repo
yum --disablerepo='*' --enablerepo='reponame' list available