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K8s DNS stack by Kargo
Here is an approximate picture of how DNS things working and being configured by Kargo ansible playbooks:
Note that an additional dnsmasq daemon set is installed by Kargo
by default. Kubelet will configure DNS base of all pods to use that
dnsmasq cluster IP. You can disable it with the skip_dnsmasq
var. This may be the case, if you're fine with Linux limit of max 3
nameservers in the /etc/resolv.conf. When skipped and bypassed
directly to Kubedns's dnsmasq cluster IP, it greatly simplifies things
by the price of limited nameservers though.
Nameservers are configured in the hosts' /etc/resolv.conf files
from the nameservers (see also searchdomains) vars. While the
upstream_dns_servers will define additional DNS servers for the
dnsmasq daemon set running on all hosts (unless bypassed with
skip_dnsmasq).