Specify Nodes DNS Servers

This topic describes how to define network profiles for Kubernetes clusters provisioned with VMware Tanzu Kubernetes Grid Integrated Edition on vSphere with NSX-T.

DNS Configuration for Kubernetes Clusters

You can specify multiple DNS entries in a Network Profile to override the Nodes DNS parameter configured in the TKGI tile. In a multi-tenant environment, for example, each tenant can have a different set of DNS servers to do a DNS lookup.

Using a network profile, you can define one or more DNS servers for use with Kubernetes clusters. Elements in the nodes_dns field of a network profile override the DNS server that is configured in the Networking section of the Tanzu Kubernetes Grid Integrated Edition tile. For more information, see Networking.

The nodes_dns field accepts an array with up to three elements. Each element must be a valid IP address of a DNS server. If you are deploying Tanzu Kubernetes Grid Integrated Edition in a multi-tenant environment with multiple Tier-0 routers and a single TKGI foundation (installation) shared across all the tenants, or if you have shared services that can be accessed by all Kubernetes clusters deployed across multiple Tier-0 routers, the first DNS server entered should be a shared DNS server. Subsequent DNS entries in the Network Profile can be specific to the tenant.

Note: TKGI allocates IP Addresses from the start of the floating IP pool range. To avoid conflicts with internal TKGI functions, always use IP addresses from the end of the floating IP pool.

The following example network profile, nodes-dns.json, demonstrates the configuration of the nodes_dns parameter with 3 DNS servers. Each entry is the IP address of a DNS server, with the first entry being a public DNS server.

nodes-dns.json
{
	"description": "Overwrite Nodes DNS Entry",
	"name": "nodes_dns_multiple",
	"parameters": {
		"nodes_dns": [
			"8.8.8.8", "192.168.115.1", "192.168.116.1"
		]
	}
}