wikiv3:mirror

Repositório local CentOS

Repositório local CentOS

Software necessários e configuração inicial

# yum install httpd createrepo rsync policycoreutils-python

# chkconfig httpd on
# service httpd start

# iptables -I INPUT 5 -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
# service iptables save

Repotitórios disponíveis Para encontra uma lista de repositórios rsync acesse o site http://www.centos.org/download/mirrors/. Checando a estrutura de diretório do repositório escolhido.

Lendo os repositórios

# rsync rsync://centos.ufms.br/CentOS
# rsync rsync://centos.ufms.br/CentOS/7/

Script CentOS 6

mirror_centos6.sh

# cat /srv/scripts/mirror_centos6.sh 
#!/bin/bash
SOURCE1="rsync://centos.ufms.br/CentOS/6"
SOURCE2="rsync://centos.ufms.br/CentOS/6.7"
TARGET="/var/www/html/centos"
CREATE="createrepo_centos6.sh"
LOGS="/var/log/mirror"
LOGOFILE="/var/log/mirror/centos_6.log"
MAILNOTIFY="gean@rascunhos.wiki.br"
DEBUGFILE="/var/log/mirror/centos_6.debug"
MAILSUBJECT="ERRO Repositorio CentOS 6"
LOCKFILE="/var/log/mirror/centos_6.lock"
 
# funcao para registrar os logs
function log()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    LOG:" $1 | tee -a ${LOGFILE}
}
 
# Cria o diretorio mirror se ele nao existir
if [ ! -d ${LOGS} ] ; then
  log "Diretorio de logs criado."
  mkdir -p ${LOGS}
fi
 
# funcao para registrar os erros
function error()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | tee -a ${LOGFILE}
  if [ -n "${MAILNOTIFY}" ] ; then
    echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | mail -s "${MAILSUBJECT}" ${MAILNOTIFY}
  fi
}
 
# funcao para registrar o status
function status()
{
  case "$1" in
    0)
      log "Synchronization completed."
      ;;
    1)
      error "RSYNC: Syntax or usage error."
      ;;
    2)
      error "RSYNC: Protocol incompatibility."
      ;;
    3)
      error "RSYNC: Errors selecting input/output files, dirs."
      ;;
    4)
      error "RSYNC: Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an option was specified that is supported by the client and not by the server."
      ;;
    5)
      error "RSYNC: Error starting client-server protocol."
      ;;
    6)
      error "RSYNC: Daemon unable to append to log-file."
      ;;
    10)
      error "RSYNC: Error in socket I/O."
      ;;
    11)
      error "RSYNC: Error in file I/O."
      ;;
    12)
      error "RSYNC: Error in rsync protocol data stream."
      ;;
    13)
      error "RSYNC: Errors with program diagnostics."
      ;;
    14)
      error "RSYNC: Error in IPC code."
      ;;
    20)
      error "RSYNC: Received SIGUSR1 or SIGINT."
      ;;
    21)
      error "RSYNC: Some error returned by waitpid()."
      ;;
    22)
      error "RSYNC: Error allocating core memory buffers."
      ;;
    23)
      error "RSYNC: Partial transfer due to error."
      ;;
    24)
      error "RSYNC: Partial transfer due to vanished source files."
      ;;
    25)
      error "RSYNC: The --max-delete limit stopped deletions."
      ;;
    30)
      error "RSYNC: Timeout in data send/receive."
      ;;
    *)
      error "RSYNC: Unknown error $1."
      ;;
  esac
}
 
if [ -f ${LOCKFILE} ] ; then
  kill -0 $(cat ${LOCKFILE}) >/dev/null 2>&1
  if [ $? -eq 0 ] ; then
    error "Previous process still running."
    exit 1
  else
    log "Deprecated lock file found. Remove lock file."
    rm -f ${LOCKFILE}
  fi
fi
 
echo $$ >${LOCKFILE}
 
# Create local mirror directories if not exists
if [ ! -d ${TARGET} ] ; then
  log "Diretorio do repositorio criado."
  mkdir -p ${TARGET}
fi
 
#Comando rsync
log "Iniciando o download do repositorio CentOS 6." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
rsync -av --bwlimit=4096 --exclude=repodata --exclude=debug --exclude=isos ${SOURCE1} ${TARGET} >> ${DEBUGFILE} 2>&1
rsync -av --bwlimit=4096 --exclude=repodata --exclude=debug --exclude=isos ${SOURCE2} ${TARGET} >> ${DEBUGFILE} 2>&1
status $?
 
#usa o cat para esvaziar o arquivo $CRIAR.
cat /dev/null > $CREATE
 
# cria o script para executar pos download 
cat << EOF > $CREATE
#!/bin/bash
#Esse script executa o comando createrepo em todos os diretórios com arquivos .rpm.
# Criado em: `date`
EOF
 
# aqui buscamos os arquivos das arquiteturar x86_64 e i386 para rodarmos o createrepo
# isso evita erro no clientes
find /var/www/html/centos/6/ -name "x86_64" >> $CREATE
find /var/www/html/centos/6/ -name "i386" >> $CREATE
 
# colocando o createrepo ates do var 
# na primeira execucao atere createrepo --update para createrepo
sed -i "s/\/var/createrepo --update \/var/g" $CREATE
 
# Alterando as permissoes e executando
chmod 750 $CREATE
 
log "Iniciando a criacao da base de dados." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
/bin/bash $CREATE
status $?
 
rm -f ${LOCKFILE}
 
exit 0

# tail -f /var/log/mirror/centos_6.debug

Script CentOS 7

mirror_centos7.sh

# cat /srv/scripts/mirror_centos7.sh 
#!/bin/bash
SOURCE1="rsync://centos.ufms.br/CentOS/7"
SOURCE2="rsync://centos.ufms.br/CentOS/7.1.1503"
TARGET="/var/www/html/centos"
CREATE="createrepo_centos7.sh"
LOGS="/var/log/mirror"
LOGOFILE="/var/log/mirror/centos_7.log"
MAILNOTIFY="gean@rascunhos.wiki.br"
DEBUGFILE="/var/log/mirror/centos_7.debug"
MAILSUBJECT="ERRO Repositorio CentOS 7"
LOCKFILE="/var/log/mirror/centos_7.lock"
 
# funcao para registrar os logs
function log()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    LOG:" $1 | tee -a ${LOGFILE}
}
 
# Cria o diretorio mirror se ele nao existir
if [ ! -d ${LOGS} ] ; then
  log "Diretorio de logs criado."
  mkdir -p ${LOGS}
fi
 
# funcao para registrar os erros
function error()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | tee -a ${LOGFILE}
  if [ -n "${MAILNOTIFY}" ] ; then
    echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | mail -s "${MAILSUBJECT}" ${MAILNOTIFY}
  fi
}
 
# funcao para registrar o status
function status()
{
  case "$1" in
    0)
      log "Synchronization completed."
      ;;
    1)
      error "RSYNC: Syntax or usage error."
      ;;
    2)
      error "RSYNC: Protocol incompatibility."
      ;;
    3)
      error "RSYNC: Errors selecting input/output files, dirs."
      ;;
    4)
      error "RSYNC: Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an option was specified that is supported by the client and not by the server."
      ;;
    5)
      error "RSYNC: Error starting client-server protocol."
      ;;
    6)
      error "RSYNC: Daemon unable to append to log-file."
      ;;
    10)
      error "RSYNC: Error in socket I/O."
      ;;
    11)
      error "RSYNC: Error in file I/O."
      ;;
    12)
      error "RSYNC: Error in rsync protocol data stream."
      ;;
    13)
      error "RSYNC: Errors with program diagnostics."
      ;;
    14)
      error "RSYNC: Error in IPC code."
      ;;
    20)
      error "RSYNC: Received SIGUSR1 or SIGINT."
      ;;
    21)
      error "RSYNC: Some error returned by waitpid()."
      ;;
    22)
      error "RSYNC: Error allocating core memory buffers."
      ;;
    23)
      error "RSYNC: Partial transfer due to error."
      ;;
    24)
      error "RSYNC: Partial transfer due to vanished source files."
      ;;
    25)
      error "RSYNC: The --max-delete limit stopped deletions."
      ;;
    30)
      error "RSYNC: Timeout in data send/receive."
      ;;
    *)
      error "RSYNC: Unknown error $1."
      ;;
  esac
}
 
if [ -f ${LOCKFILE} ] ; then
  kill -0 $(cat ${LOCKFILE}) >/dev/null 2>&1
  if [ $? -eq 0 ] ; then
    error "Previous process still running."
    exit 1
  else
    log "Deprecated lock file found. Remove lock file."
    rm -f ${LOCKFILE}
  fi
fi
 
echo $$ >${LOCKFILE}
 
# Create local mirror directories if not exists
if [ ! -d ${TARGET} ] ; then
  log "Diretorio do repositorio criado."
  mkdir -p ${TARGET}
fi
 
#Comando rsync
log "Iniciando o download do repositorio CentOS 7." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
rsync -av --bwlimit=4096 --exclude=repodata --exclude=debug --exclude=isos ${SOURCE1} ${TARGET} >> ${DEBUGFILE} 2>&1
rsync -av --bwlimit=4096 --exclude=repodata --exclude=debug --exclude=isos ${SOURCE2} ${TARGET} >> ${DEBUGFILE} 2>&1
status $?
 
#usa o cat para esvaziar o arquivo $CRIAR.
cat /dev/null > $CREATE
 
# cria o script para executar pos download 
cat << EOF > $CREATE
#!/bin/bash
#Esse script executa o comando createrepo em todos os diretórios com arquivos .rpm.
# Criado em: `date`
EOF
 
# aqui buscamos os arquivos das arquiteturar x86_64 para rodarmos o createrepo
# isso evita erro no clientes
find /var/www/html/centos/7/ -name "x86_64" >> $CREATE
 
# colocando o createrepo ates do var 
# na primeira execucao atere createrepo --update para createrepo
sed -i "s/\/var/createrepo --update \/var/g" $CREATE
 
# Alterando as permissoes e executando
chmod 750 $CREATE
 
log "Iniciando a criacao da base de dados." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
/bin/bash $CREATE
status $?
 
rm -f ${LOCKFILE}
 
exit 0

# tail -f /var/log/mirror/centos_7.debug

Script epel CentOS 6

mirror_epel6.sh

# cat /srv/scripts/mirror_epel6.sh 
#!/bin/bash
SOURCE="rsync://mirrors.rit.edu/epel/6"
TARGET="/var/www/html/epel"
CREATE="createrepoepel6.sh"
LOGS="/var/log/mirror"
LOGOFILE="/var/log/mirror/epel_6.log"
MAILNOTIFY="gean@rascunhos.wiki.br"
DEBUGFILE="/var/log/mirror/epel_6.debug"
MAILSUBJECT="ERRO Repositorio epel CentOS 6"
LOCKFILE="/var/log/mirror/epel_6.lock"
 
# funcao para registrar os logs
function log()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    LOG:" $1 | tee -a ${LOGFILE}
}
 
# Cria o diretorio mirror se ele nao existir
if [ ! -d ${LOGS} ] ; then
  log "Diretorio de logs criado."
  mkdir -p ${LOGS}
fi
 
# funcao para registrar os erros
function error()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | tee -a ${LOGFILE}
  if [ -n "${MAILNOTIFY}" ] ; then
    echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | mail -s "${MAILSUBJECT}" ${MAILNOTIFY}
  fi
}
 
# funcao para registrar o status
function status()
{
  case "$1" in
    0)
      log "Synchronization completed."
      ;;
    1)
      error "RSYNC: Syntax or usage error."
      ;;
    2)
      error "RSYNC: Protocol incompatibility."
      ;;
    3)
      error "RSYNC: Errors selecting input/output files, dirs."
      ;;
    4)
      error "RSYNC: Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an option was specified that is supported by the client and not by the server."
      ;;
    5)
      error "RSYNC: Error starting client-server protocol."
      ;;
    6)
      error "RSYNC: Daemon unable to append to log-file."
      ;;
    10)
      error "RSYNC: Error in socket I/O."
      ;;
    11)
      error "RSYNC: Error in file I/O."
      ;;
    12)
      error "RSYNC: Error in rsync protocol data stream."
      ;;
    13)
      error "RSYNC: Errors with program diagnostics."
      ;;
    14)
      error "RSYNC: Error in IPC code."
      ;;
    20)
      error "RSYNC: Received SIGUSR1 or SIGINT."
      ;;
    21)
      error "RSYNC: Some error returned by waitpid()."
      ;;
    22)
      error "RSYNC: Error allocating core memory buffers."
      ;;
    23)
      error "RSYNC: Partial transfer due to error."
      ;;
    24)
      error "RSYNC: Partial transfer due to vanished source files."
      ;;
    25)
      error "RSYNC: The --max-delete limit stopped deletions."
      ;;
    30)
      error "RSYNC: Timeout in data send/receive."
      ;;
    *)
      error "RSYNC: Unknown error $1."
      ;;
  esac
}
 
if [ -f ${LOCKFILE} ] ; then
  kill -0 $(cat ${LOCKFILE}) >/dev/null 2>&1
  if [ $? -eq 0 ] ; then
    error "Previous process still running."
    exit 1
  else
    log "Deprecated lock file found. Remove lock file."
    rm -f ${LOCKFILE}
  fi
fi
 
echo $$ >${LOCKFILE}
 
# Create local mirror directories if not exists
if [ ! -d ${TARGET} ] ; then
  log "Diretorio do repositorio criado."
  mkdir -p ${TARGET}
fi
 
#Comando rsync
log "Iniciando o download do repositorio epel CentOS 6." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
rsync -av --bwlimit=4096 --exclude=SRPMS --exclude=ppc64 ${SOURCE} ${TARGET} >> ${DEBUGFILE} 2>&1
 
status $?
 
#usa o cat para esvaziar o arquivo $CRIAR.
cat /dev/null > $CREATE
 
# cria o script para executar pos download 
cat << EOF > $CREATE
#!/bin/bash
#Esse script executa o comando createrepo em todos os diretórios com arquivos .rpm.
# Criado em: `date`
EOF
 
# aqui buscamos os arquivos das arquiteturar x86_64 e i386 para rodarmos o createrepo
# isso evita erro no clientes
find /var/www/html/epel/6/ -name "x86_64" >> $CREATE
find /var/www/html/epel/6/ -name "i386" >> $CREATE
 
# colocando o createrepo ates do var 
# na primeira execucao atere createrepo --update para createrepo
sed -i "s/\/var/createrepo --update \/var/g" $CREATE
 
# Alterando as permissoes e executando
chmod 750 $CREATE
 
log "Iniciando a criacao da base de dados." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
/bin/bash $CREATE
status $?
 
rm -f ${LOCKFILE}
 
exit 0

# tail -f /var/log/mirror/epel_6.debug

Srcipt epel CentOS 7

mirror_epel7.sh

# cat /srv/scripts/mirror_epel7.sh 
#!/bin/bash
SOURCE="rsync://mirrors.rit.edu/epel/7"
TARGET="/var/www/html/epel"
CREATE="createrepo_epel7.sh"
LOGS="/var/log/mirror"
LOGOFILE="/var/log/mirror/epel_7.log"
MAILNOTIFY="gean@rascunhos.wiki.br"
DEBUGFILE="/var/log/mirror/epel_7.debug"
MAILSUBJECT="ERRO Repositorio epel CentOS 7"
LOCKFILE="/var/log/mirror/epel_7.lock"
 
# funcao para registrar os logs
function log()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    LOG:" $1 | tee -a ${LOGFILE}
}
 
# Cria o diretorio mirror se ele nao existir
if [ ! -d ${LOGS} ] ; then
  log "Diretorio de logs criado."
  mkdir -p ${LOGS}
fi
 
# funcao para registrar os erros
function error()
{
  echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | tee -a ${LOGFILE}
  if [ -n "${MAILNOTIFY}" ] ; then
    echo `date +%d.%m.%Y%t%H:%M:%S` "    ERROR:" $1 | mail -s "${MAILSUBJECT}" ${MAILNOTIFY}
  fi
}
 
# funcao para registrar o status
function status()
{
  case "$1" in
    0)
      log "Synchronization completed."
      ;;
    1)
      error "RSYNC: Syntax or usage error."
      ;;
    2)
      error "RSYNC: Protocol incompatibility."
      ;;
    3)
      error "RSYNC: Errors selecting input/output files, dirs."
      ;;
    4)
      error "RSYNC: Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an option was specified that is supported by the client and not by the server."
      ;;
    5)
      error "RSYNC: Error starting client-server protocol."
      ;;
    6)
      error "RSYNC: Daemon unable to append to log-file."
      ;;
    10)
      error "RSYNC: Error in socket I/O."
      ;;
    11)
      error "RSYNC: Error in file I/O."
      ;;
    12)
      error "RSYNC: Error in rsync protocol data stream."
      ;;
    13)
      error "RSYNC: Errors with program diagnostics."
      ;;
    14)
      error "RSYNC: Error in IPC code."
      ;;
    20)
      error "RSYNC: Received SIGUSR1 or SIGINT."
      ;;
    21)
      error "RSYNC: Some error returned by waitpid()."
      ;;
    22)
      error "RSYNC: Error allocating core memory buffers."
      ;;
    23)
      error "RSYNC: Partial transfer due to error."
      ;;
    24)
      error "RSYNC: Partial transfer due to vanished source files."
      ;;
    25)
      error "RSYNC: The --max-delete limit stopped deletions."
      ;;
    30)
      error "RSYNC: Timeout in data send/receive."
      ;;
    *)
      error "RSYNC: Unknown error $1."
      ;;
  esac
}
 
if [ -f ${LOCKFILE} ] ; then
  kill -0 $(cat ${LOCKFILE}) >/dev/null 2>&1
  if [ $? -eq 0 ] ; then
    error "Previous process still running."
    exit 1
  else
    log "Deprecated lock file found. Remove lock file."
    rm -f ${LOCKFILE}
  fi
fi
 
echo $$ >${LOCKFILE}
 
# Create local mirror directories if not exists
if [ ! -d ${TARGET} ] ; then
  log "Diretorio do repositorio criado."
  mkdir -p ${TARGET}
fi
 
#Comando rsync
log "Iniciando o download do repositorio epel CentOS 7." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
rsync -av --bwlimit=4096 --exclude=SRPMS --exclude=ppc64 ${SOURCE} ${TARGET} >> ${DEBUGFILE} 2>&1
status $?
 
#usa o cat para esvaziar o arquivo $CRIAR.
cat /dev/null > $CREATE
 
# cria o script para executar pos download 
cat << EOF > $CREATE
#!/bin/bash
#Esse script executa o comando createrepo em todos os diretórios com arquivos .rpm.
# Criado em: `date`
EOF
 
# aqui buscamos os arquivos das arquiteturar x86_64 para rodarmos o createrepo
# isso evita erro no clientes
find /var/www/html/epel/7/ -name "x86_64" >> $CREATE
 
# colocando o createrepo ates do var 
# na primeira execucao atere createrepo --update para createrepo
sed -i "s/\/var/createrepo --update \/var/g" $CREATE
 
# Alterando as permissoes e executando
chmod 750 $CREATE
 
log "Iniciando a criacao da base de dados." >> ${DEBUGFILE} 2>&1
echo ">>>>>" `date +%d.%m.%Y%t%H:%M:%S` "<<<<<" >>${DEBUGFILE}
/bin/bash $CREATE
status $?
 
rm -f ${LOCKFILE}
 
exit 0

# tail -f /var/log/mirror/epel_7.debug

Rotação dos logs

# cat /etc/logrotate.d/mirror
/var/log/mirror/*log {
    monthly
    rotate 3
    compress
    delaycompress
    missingok
    notifempty
}

# chcon -u system_u /etc/logrotate.d/mirror

VirtualHosts

# cat /etc/httpd/conf.d/mirror.conf
NameVirtualHost *:80
 
<VirtualHost *:80>
        ServerAdmin gean@laboratorio.com.br
        ServerName www.mirror.laboratorio.com.br
        ServerAlias mirror.mba.laboratorio.com.br
   	DocumentRoot "/var/www/html/centos"
 
   <Directory "/var/www/html/centos">
      	Options +Indexes +FollowSymLinks
      	AllowOverride None
      	Order allow,deny
      	Allow from all
   </Directory>
 
   <LocationMatch "\.(xml|xml\.gz|xml\.asc|sqlite)$">
      	Header set Cache-Control "must-revalidate"
      	ExpiresActive On
      	ExpiresDefault "now"
   </LocationMatch>
 
   	LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" %I %O \"%{User-Agent}i\"" combined
</VirtualHost>

# cat /etc/httpd/conf.d/epel.conf 
NameVirtualHost *:80
 
<VirtualHost *:80>
   	ServerAdmin gean@laboratorio.com.br
        ServerName www.epel.laboratorio.com.br
        ServerAlias epel.laboratorio.com.br
        DocumentRoot "/var/www/html/epel"
 
   <Directory "/var/www/html/epel">
      	Options +Indexes +FollowSymLinks
      	AllowOverride None
      	Order allow,deny
      	Allow from all
   </Directory>
 
   <LocationMatch "\.(xml|xml\.gz|xml\.asc|sqlite)$">
      	Header set Cache-Control "must-revalidate"
      	ExpiresActive On
      	ExpiresDefault "now"
   </LocationMatch>
 
   	LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" %I %O \"%{User-Agent}i\"" combined
</VirtualHost>

# cd /var/www/html
# chown -R apache:apache .*
# semanage fcontext -a -t httpd_sys_content_t "/centos(/.*)?"
# semanage fcontext -a -t httpd_sys_content_t "/epel(/.*)?"
# restorecon -R -v centos
# restorecon -R -v epel

Agendamento do scripts

# crontab -e
# crontab -l
00 00 * * * /srv/script/mirror_centos6.sh
00 02 * * * /srv/script/mirror_centos7.sh
00 04 * * * /srv/script/mirror_epel6.sh
00 06 * * * /srv/script/mirror_epel7.sh

Configuração no clientes

Repositório base

sed -i "s/http\:\/\/mirror.centos.org\/centos/http\:\/\/mirror.laboratorio.com.br/g" /etc/yum.repos.d/CentOS-Base.repo
sed -i "s/enabled=0/enabled=1/g" /etc/yum.repos.d/CentOS-Base.repo
sed -i "s/mirrorlist/#mirrorlist/g" /etc/yum.repos.d/CentOS-Base.repo
sed -i "s/#baseurl/baseurl/g" /etc/yum.repos.d/CentOS-Base.repo

Epel

sed -i "s/http\:\/\/download.fedoraproject.org\/pub\/epel/http\:\/\/epel.laboratorio.com.br/g" /etc/yum.repos.d/epel.repo
sed -i "s/mirrorlist/#mirrorlist/g" /etc/yum.repos.d/epel.repo
sed -i "s/#baseurl/baseurl/g" /etc/yum.repos.d/epel.repo

Para limpar os pacotes do cache:

# yum clean packages

Para limpar os cabeçalhos do cache:

# yum clean headers

Para limpar todo o cache:

# yum clean all

Para reconstruir o cache:

# yum makecache

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