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I'm trying to upgrade CentOS 7.2 to 7.3 and I don't want to upgrade it to 7.4. How can I achieve this? Any hints are quite welcome.

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You could use the mirror at vault.centos.org which provide snapshots of the releases. Also view the readme.txt on that site.

To make use of this mirror, you have to disable the default mirrors in /etc/yum.repos.d by adding enabled=0 to the specific repo configuration. Or move the configuration files to .disabled and recreate a new configuration file for the 7.3 repositories.

A sample repo configuration placed e.g. at /etc/yum.repos.d/CentOS-7.3.repo would like as follows.

[base-7.3]
name=CentOS-7.3 - Base
baseurl=http://vault.centos.org/centos/7.3.1611/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[updates-7.3]
name=CentOS-7.3 - Updates
baseurl=http://vault.centos.org/centos/7.3.1611/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Depending on your needs you might want to add different or additional repositories. To see which repositories are active you can enter

yum repolist

After changing your repository configuration you should clean up the yum cache.

yum clean all
rm -rf /var/cache/yum

Now when you update your system with yum update the RPMs at the 7.3 repository should be picked up.

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