Workflow to Reserve IPs Allocated to TKGm Control Plane and Worker Nodes with NSX-T DHCP Service

Products

• VMware NSX
• VMware Tanzu Kubernetes Grid

Issue/Introduction

TKGm control plane and worker nodes require IPs assigned via DHCP. However, with NSXT DHCP service, there is no built-in mechanism to reserve these allocated IPs. This can lead to IP changes upon reboot, causing potential disruptions.

Environment

VMware NSX-T Data Center
VMware NSX

Resolution

The following workaround involves creating DHCP Static Binding configurations on the NSX Segment that hosts the TKGm nodes. The steps are as follows:

1. Configure DHCP Service on the NSX Segment:

   • Set up DHCP service on the NSX Segment that will be used by the TKGm nodes.

2. Retrieve VM IP and MAC Information:

   • Once the TKGm nodes get a DHCP IP, the VM's IP and MAC can be retrieved and a static DHCP binding entry can be created on the Segment.
   • Using the retrieved IP and MAC information, create DHCP static binding entries on the NSX-T Segment corresponding to each TKGm node.