Rancher Suite K8S Adventure - Chapter 004 - Rancher RKE2 IP Addressing and DNS
A travelogue of converting from OpenStack to Suse's Rancher Suite for K8S including RKE2, Harvester, kubectl, helm.
Each machine in the cluster needs an ip address, so I added them in Netbox (Its a web-based IPAM system) and physically labeled each machine.
rancher1.cedar.mulhollon.com = 10.10.20.71
rancher2.cedar.mulhollon.com = 10.10.20.72
rancher3.cedar.mulhollon.com = 10.10.20.73
Ansible does my DNS configuration in Active Directory as seen at this URL:
The cluster overall needs an entry where rancher.cedar.mulhollon.com points to all the load balancers in the cluster. This results in several problems:
I've never really found "the right way" to store a DNS entry like that in Netbox. Then again, its not using an ip address, so does it really "need" to be stored in Netbox?
The other problem is Samba round robin DNS is not supported LOL.
https://wiki.samba.org/index.php/Samba_Internal_DNS_Back_End#Limitations
So, that's annoying. It'll always return the same answer in the same order. I think this will be "OK" for access when/if the first host crashes, but it will be very suboptimal for load balancing because essentially all incoming traffic will go to only one cluster machine.
In the long run I've been considering setting up a "nice" load balancer on the large Harvester cluster to do proper load balancing for the small cluster and vice versa, or something like that.
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