Configuration using an external DNS server
In this approach, all DNS records including A records for individual nodes and the cluster virtual host name are managed on your organization's external DNS server. Clients and infrastructure components reference this server for name resolution.
When using an external DNS server, all DNS configurations including A records for individual nodes and the cluster virtual host name must be created and managed on that server. The Cohesity cluster, infrastructure components, and clients will all reference this DNS server for name resolution.
The following diagram illustrates a typical VIP configuration using an external DNS server:
To achieve the above configuration, DNS entries are required as follows:
Table:
Record type | Host name | IP address |
|---|---|---|
A | cohesity-n1.acme.com | 10.x.x.50 |
A | cohesity-n2.acme.com | 10.x.x.51 |
A | cohesity-n3.acme.com | 10.x.x.52 |
A | cohesity-n4.acme.com | 10.x.x.53 |
A | cohesity.acme.com | 10.x.x.30 |
A | cohesity.acme.com | 10.x.x.31 |
A | cohesity.acme.com | 10.x.x.32 |
A | cohesity.acme.com | 10.x.x.33 |
The round-robin policy on the DNS server ensures that requests to cohesity.acme.com are distributed across the available VIPs.
Once the DNS records are in place, the VIPs can be configured during the initial cluster setup. In the Cohesity UI, navigate to: Settings > Networking > VIPs tab.
Here, you can view and manage the assigned VIPs, ensuring that they align with the DNS entries.