If you get an error like the following one:
ERROR with rpm_check_debug vs depsolve:
yum-plugin-fastestmirror is needed by yum-3.2.29-60.el6.centos.noarch
** Found 1 pre-existing rpmdb problem(s), ‘yum check’ output follows:
yum-3.2.29-40.el6.centos.noarch has missing requires of yum-plugin-fastestmirror
Your transaction was saved, rerun it with: yum load-transaction /tmp/yum_save_tx-2015-06-19-01-55B6BTlV.yumtx
yum install yum-plugin-fastestmirror
and that’s it!