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kubespray/docs/dns-stack.md

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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:

Image

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).