Pin CentOS repository to 6.7 to prevent yum update goes to 6.8

pin_centos6.7.txt

1. disable Base repo
sed -i.bak '/^gpgcheck=1/ a enabled=0 ' /etc/yum.repos.d/CentOS-Base.repo

2. append Vault repo with CentOS 6.7
#-----------------

[C6.7-base]
name=CentOS-6.7 - Base
baseurl=http://vault.centos.org/6.7/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#enabled=0

[C6.7-updates]
name=CentOS-6.7 - Updates
baseurl=http://vault.centos.org/6.7/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#enabled=0

[C6.7-extras]
name=CentOS-6.7 - Extras
baseurl=http://vault.centos.org/6.7/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#enabled=0

[C6.7-contrib]
name=CentOS-6.7 - Contrib
baseurl=http://vault.centos.org/6.7/contrib/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#enabled=0

[C6.7-centosplus]
name=CentOS-6.7 - CentOSPlus
baseurl=http://vault.centos.org/6.7/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#enabled=0

3. yum update yum -y

4. yum update -y