A ver.. Ellos usan Fedora para generar paquetes de RHEL / CentOS en vez de usar a CentOS :D. En Fedora te basta el repo rpmfusion..

De esta manera se ha hecho siempre :D.. Como?

[b]Instalas (en Fedora):[/b]

sudo rpm -ivh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm \

http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm

sudo yum install mock.noarch \
   mock-rpmfusion-free.noarch mock-rpmfusion-nonfree.noarch \
   fedora-packager.noarch

[b]Preparas el entorno:[/b]

MOCKCFGDIR="/etc/mock"
MOCKDIR="/export/mock"
MOCKBASEDIR="${MOCKDIR}/base"
MOCKCACHEDIR="${MOCKDIR}/cache"
REPOBASEDIR="${MOCKDIR}/repo"

MYMOCKUSER=peter

FTPSERVER="ftp1.mirepo.cz"
FTPSERVERSSH="22"
FTPBASEDIR="/var/ftp/pub/mirepo"
FTPSERVERMIRRORS="ftp2.mirepo.cz ftp3.mirepo.cz"

sudo useradd -m -G mock $MYMOCKUSER

su - $MYMOCKUSER

sudo chown -R :mock ${MOCKCFGDIR}
sudo chmod -R g+w ${MOCKCFGDIR}

if [ ! -d "$REPOBASEDIR" ] ; then
   sudo mkdir -p "$REPOBASEDIR"
fi

for dist in fedora ; do
   for distnr in 20 21 ; do
      for repotype in os updates testing ; do
         sudo mkdir -p ${REPOBASEDIR}/${dist}/${distnr}/${repotype}/{i386/RPMS,x86_64/RPMS,SRPMS}
      done
   done
done

for dist in centos ; do
   for distnr in 6 7 ; do
      for repotype in os updates testing ; do
         sudo mkdir -p ${REPOBASEDIR}/${dist}/${distnr}/${repotype}/{i386/RPMS,x86_64/RPMS,SRPMS}
      done
   done
done

sudo chgrp -R mock ${REPOBASEDIR}
sudo chmod -R g+w ${REPOBASEDIR}

cp ${MOCKCFGDIR}/site-defaults.cfg ${MOCKCFGDIR}/site-defaults.cfg-orig

sed -e "s@# config_opts\['basedir'\] = '/var/lib/mock/'@config_opts['basedir'] = '${MOCKBASEDIR}'@" \
    -e "s@# config_opts\['cache_topdir'\] = '/var/cache/mock'@config_opts['cache_topdir'] = '${MOCKCACHEDIR}'@" \
   ${MOCKCFGDIR}/site-defaults.cfg-orig > ${MOCKCFGDIR}/site-defaults.cfg

sudo mkdir -p ${MOCKBASEDIR} ${MOCKCACHEDIR}
sudo chgrp mock ${MOCKBASEDIR} ${MOCKCACHEDIR}
sudo chmod -R g+rws ${MOCKBASEDIR} ${MOCKCACHEDIR}

sudo rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-*

mock -r fedora-20-i386 init
mock -r fedora-20-x86_64 init
mock -r fedora-21-i386 init
mock -r fedora-21-x86_64 init

mock -r epel-6-i386 init
mock -r epel-6-x86_64 init
mock -r epel-7-i386 init
mock -r epel-7-x86_64 init

mock -r mirepo-epel-6-i386 init
mock -r mirepo-epel-6-x86_64 init
mock -r mirepo-epel-7-i386 init
mock -r mirepo-epel-7-x86_64 init

[b]Creacion de paquetes:[/b]

cd ~/rpmbuild/SPECS

vim mod_auth_pgsql.spec

rpmbuild-md5 -ba mod_auth_pgsql.spec

rpmbuild-md5 --nodeps -bs mod_auth_pgsql.spec

mock rebuild -r epel-7-i386 /usr/src/redhat/SRPMS/mod_auth_pgsql-2.0.3-2.f20.src.rpm

srcrpmpath=~/rpmbuild/SRPMS/mod_auth_pgsql-2.0.3-2.f20.src.rpm
for dist in fedora-20-i386 fedora-20-x86_64 ; do
   mock rebuild -r $dist $srcrpmpath &
done

srcrpmpath=~/rpmbuild/SRPMS/mod_auth_pgsql-2.0.3-2.f20.src.rpm
for dist in epel-6-i386 epel-6-x86_64 epel-7-i386 epel-7-x86_64 ; do
   mock rebuild -r $dist $srcrpmpath &
done

srcrpmpath=~/rpmbuild/SRPMS/mod_auth_pgsql-2.0.3-2.f20.src.rpm
for dist in mirepo-epel-6-i386 mirepo-epel-6-x86_64 mirepo-epel-7-i386 mirepo-epel-7-x86_64 ; do
   mock rebuild -r $dist $srcrpmpath &
done

sudo yum -y install multitail

multitail ${MOCKBASEDIR}/epel-6-*/result/*.log
multitail ${MOCKBASEDIR}/epel-7-*/result/*.log

[b]Actualizas los repos:[/b]

REPONAMEPATTERN="epel"
REPONAMEPATTERN="epel-6"
REPONAMEPATTERN="epel-7"
REPONAMEPATTERN="mirepo-epel"
REPONAMEPATTERN="mirepo-epel-6"
REPONAMEPATTERN="mirepo-epel-7"

[b]Firmas los paquetes:[/b]

RPMS_TO_SIGN=$(find ${MOCKBASEDIR}/${REPONAMEPATTERN}*/result/ -name '*.rpm' | tr '\n' ' ' )
rpmsign --addsign $RPMS_TO_SIGN

[b]Transportas los paquetes a un repo local:[/b]

unset REPONAMEPATTERN
REPONAMEPATTERN="fedora"
REPONAMEPATTERN="centos"
REPONAMEPATTERN="epel"
REPONAMEPATTERN="mirepo-epel"

BUILDTYPE="os"
BUILDTYPE="updates"
BUILDTYPE="testing"

pushd ${MOCKBASEDIR}

for mockchroot in $(/bin/ls -d ${REPONAMEPATTERN}*) ; do
   if [ "${mockchroot%%-*}" == "fedora" ] ; then
      repodist=fedora
   else
      repodist=centos
   fi
   distnr="$(echo $mockchroot | sed -e 's/.*-\([^-]\+\)-\([^-]\+\)$/\1/')"
   arch="$(echo $mockchroot | sed -e 's/.*-\([^-]\+\)-\([^-]\+\)$/\2/')"

   mv ${MOCKBASEDIR}/$(basename ${mockchroot})/result/*.src.rpm ${REPOBASEDIR}/${repodist}/${distnr}/${BUILDTYPE}/SRPMS
   mv ${MOCKBASEDIR}/$(basename ${mockchroot})/result/*.rpm ${REPOBASEDIR}/${repodist}/${distnr}/${BUILDTYPE}/${arch}/RPMS
done

popd

[b]Creas el repo y lo subes al ftp:[/b]

[b]Para CentOS:[/b]

Ejecutas createrepo en un servidor CentOS

unset DRYRUN

DRYRUN="-n"

if [ -n "${REPOBASEDIR}" -a -n "${FTPSERVER}" -a -n "${FTPBASEDIR}" ] ; then
   rsync -av --delete -e "ssh -l root -p ${FTPSERVERSSH}" ${REPOBASEDIR}/centos/ ${FTPSERVER}:/${FTPBASEDIR}/centos/ \
   --exclude headers/ --exclude repodata/ --exclude /kickstarts/ \
   ${DRYRUN}
else
fi

ssh -l root -p ${FTPSERVERSSH} ${FTPSERVER} "
for distnr in 6 7 ; do
   for type in $BUILDTYPE ; do
      for arch in i386 x86_64 SRPMS ; do
         workingdir=${FTPBASEDIR}/centos/\${distnr}/\${type}/\${arch}
         if [ -d \${workingdir} ] ; then
            createrepo \${workingdir}
         fi
      done
   done
done
"

ssh -l root -p ${FTPSERVERSSH} ${FTPSERVER} "
for distnr in 6 7 ; do
   for type in os updates testing ; do
      for arch in i386 x86_64 SRPMS ; do
         workingdir=${FTPBASEDIR}/centos/\${distnr}/\${type}/\${arch}
         if [ -d \${workingdir} ] ; then
            createrepo \${workingdir}
         fi
      done
   done
done
"

ssh -l root -p ${FTPSERVERSSH} ${FTPSERVER} "for FTPSERVERMIRROR in ${FTPSERVERMIRRORS} ; do /usr/bin/rsync -av -e 'ssh -p ${FTPSERVERSSH}' --delete ${FTPBASEDIR}/ \${FTPSERVERMIRROR}:${FTPBASEDIR}/ ; done"

[b]Para Fedora:[/b]

for distnr in 20 21 ; do
   for type in $BUILDTYPE ; do
      for arch in i386 x86_64 SRPMS ; do
         workingdir=${REPOBASEDIR}/fedora/${distnr}/${type}/${arch}
         if [ -d ${workingdir} ] ; then
            createrepo ${workingdir}
         fi
      done
   done
done

for distnr in 20 21 ; do
   for type in os updates testing ; do
      for arch in i386 x86_64 SRPMS ; do
         workingdir=${REPOBASEDIR}/fedora/${distnr}/${type}/${arch}
         if [ -d ${workingdir} ] ; then
            createrepo ${workingdir}
         fi
      done
   done
done

unset DRYRUN
DRYRUN="-n"

if [ -n "${REPOBASEDIR}" -a -n "${FTPSERVER}" -a -n "${FTPBASEDIR}" ] ; then
   rsync -av --delete -e "ssh -l root -p ${FTPSERVERSSH}" ${REPOBASEDIR}/fedora/ ${FTPSERVER}:/${FTPBASEDIR}/fedora/ \
   ${DRYRUN}
else
   echo "Nastav promenne: REPOBASEDIR, FTPSERVER a FTPBASEDIR"
fi

[b]Y listo[/b] :D