curl -sS -o repo-install.sh https://mirror.midix.ch/repo-install.sh && \
chmod +x repo-install.sh && \
./repo-install.sh && \
rm -f repo-install.sh
Paste that in a CentOS Terminal prompt.
The script makes sure your CentOS machine only gets packages from this mirror.
For this, it deactivates all existing repos on your machine. Fear not,
the script creates a backup in /etc/yum.repos.d before doing so.