You should inform in advance end users that the platform will be stopped. It can be done through mass mail engine and with a side-wide banner.
Check for upgrade
As root, run:
yum check-update tuleap\*
You should always read the deployment guide instructions before upgrading.
Run as root:
# Stop service systemctl stop tuleap nginx httpd # Upgrade packages yum update # Deploy site configurations, run database migration & co tuleap-cfg site-deploy # Restart service systemctl start tuleap nginx httpd
Enjoy all your new features!