Required external access

For non-disruptive cluster operation, the cluster must have network access to the following resources:

Destination port	Address	Purpose
TCP 80, 443	repo.virtuozzo.com	Product repository
TCP 80, 443	docker.io	Product repository
TCP 80, 443	discovery.etcd.io	Product repository
TCP 80, 443	registry-1.docker.io	Product repository
TCP 5224	ka.virtuozzo.com	Licensing server
TCP 22	sftpe.virtuozzo.com	Support server
UDP 123 (optional)	*.pool.ntp.org	NTP