K8s DNS stack by Kubespray
For K8s cluster nodes, Kubespray configures a Kubernetes DNS
cluster add-on
to serve as an authoritative DNS server for a given dns_domain and its
svc, default.svc default subdomains (a total of ndots: 5 max levels).
Other nodes in the inventory, like external storage nodes or a separate etcd cluster node group, considered non-cluster and left up to the user to configure DNS resolve.
DNS variables
There are several global variables which can be used to modify DNS settings:
ndots
ndots value to be used in /etc/resolv.conf
It is important to note that multiple search domains combined with high ndots
values lead to poor performance of DNS stack, so please choose it wisely.
searchdomains
Custom search domains to be added in addition to the cluster search domains (default.svc.{{ dns_domain }}, svc.{{ dns_domain }}).