This is designed to be used as a module.
It creates a scalable palo alto configuration in an azure availability set.
Call the module with the variables specified in 01-inputs-required.tf The module outputs a variable with the ip address of the loadbalancer
A UDR added to the subnets is required to force the traffic through the loadbalancer ip address - hitting the palo alto firewalls.
A single nic firewall guarantees that the return traffic will go via the same firewall: https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-ha-ports-overview
+------------------+
+--------+ | Subnet-A |
| | | |
| Palo | +-------+ +-------+ UDR |
| +<------+ | v +------------------+
+--------+ | Azure | LB
| LB | IP
+--------+ | | ^ +------------------+
| +<------+ | +--------+UDR |
| Palo | +-------+ | |
| | | Subnet-B |
+--------+ +------------------+
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