I want to make sure my kubernetes cluster doesnt talk to a specific domain name (*.domain.tld). How can I blacklist it?
Thanks
You should be looking into Network Policies but I think only IP's can be blocked not domains.
I think this might be achievable with istio and policy enforcement, this is explained at Denials and White/Black Listing.
You can also check out this Stack question IP Blacklisting in Istio.