Deploying FortiGate-VM HA with external and internal LB (web console)

Deploying FortiGates in a high availability (HA) cluster eliminates having a single point of failure and elevates Google Compute SLA to 99.98%. HA in a load balancer (LB) sandwich design features two FortiGate instances in an active-passive (A-P) cluster between a pair of GCP LBs (“LB sandwich” pattern) for fast and stateful failover.

This guide describes manually deploying the cluster. Fortinet publishes Terraform and deployment manager modules in its GitHub repositories. Consult documentation and examples in individual modules for automated deployments.