Docs: https://xcp-ng.org/docs/

Downloads: https://xcp-ng.org/download/

XenAdmin: https://github.com/xcp-ng/xenadmin/releases

Update: https://xcp-ng.org/docs/updates.html

Upgrade: https://xcp-ng.org/docs/upgrade.html

Tools: XenServer Tools

Forums: https://xcp-ng.org/forum/

XCP is basically a completely open-source version of Citrix XenServer.

Update using yum update. It's much better than the 'old days'! Many, if not most updates require a reboot.

Reboot the pool master first!

yum update

reboot

Upgrade the pool master first!

Upgrades are best done by booting from the new ISO.

Updates are performed using yum. Major upgrades are not.

Remote upgrades are possible:

https://github.com/xcp-ng/xcp/wiki/Upgrade-from-XenServer#alternate-method-remote-upgrade