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Step-01: Introduction

  • Implement HTTP Header based routing
  • Header Name and values
  • appname: myapp1 -> Route to myapp1
  • appname: myapp2 -> Route to myapp2
  • appname: myapp5 -> Route to default which is myapp1

Step-02: COPY OF 18-Regional-HTTP-LB-HOST-Routing

  • COPY OF 18-Regional-HTTP-LB-HOST-Routing

Step-03: c7-01-loadbalancer.tf

  • URL Map with host based routing 
    # Resource: Regional URL Map
resource "google_compute_region_url_map" "mylb" {
name            = "${local.name}-mylb-url-map"
  default_service = google_compute_region_backend_service.myapp1.id

  host_rule {
    hosts        = ["*"]
    path_matcher = "my-path-routing-1"
  }

  path_matcher {
    name            = "my-path-routing-1"
    # App1: No appname, routes to default which is myapp1
    default_service = google_compute_region_backend_service.myapp1.id
    # App2 - Route based on Header
    route_rules {
      priority = 1
      service = google_compute_region_backend_service.myapp2.id
      match_rules {
        prefix_match = "/"
        ignore_case = true
        header_matches {
          header_name = "appname"
          exact_match = "myapp2"
        }
      }
    }
  }
}

Step-04: Execute Terraform Commands

# Terraform Initialize
terraform init

# Terraform Validate
terraform validate

# Terraform Plan
terraform plan

# Terraform Apply
terraform apply

Step-05: Verify Resources

  1. Load Balancer
  2. MIG
  3. VM Instnaces
  4. Test using 
    # Curl Test
curl http://<LOAD-BALANCER-IP>
Observation:
1. Should get default backend which is myapp1

# Test Header Routing using 
URL: https://reqbin.com/
LB IP Address: http://<LOAD-BALANCER-IP>
appname: myapp1 -> Route to myapp1
appname: myapp2 -> Route to myapp2
appname: myapp5 -> Route to default which is myapp1

Step-06: Clean-Up

# Terraform Destroy
terraform destroy -auto-approve

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