terraform-iaas-api-basic-ha-vrrp/README.md

Basic High Availability (HA) Setup Using VRRP

This guide provides step-by-step instructions for setting up a basic active/passive Virtual Router Redundancy Protocol (VRRP) high availability (HA) cluster using the STACKIT CLI. This configuration ensures one virtual machine (VM) acts as the active primary node while the other remains on standby as a failover.

All operations below are performed using the STACKIT CLI.

Overview of Core Components

• Two virtual machines in an active/passive configuration.
• VRRP synchronization between the nodes.
• Security group rules for VRRP and ICMP traffic.
• A dedicated internal virtual IP (vIP) bound to a shared NIC port.
• Public IP binding for external access to HA endpoint.

Diagrams:

• HA Traffic Flow:

  

• vIP Binding Concept: