GCP: Create multi-regional Load-Balancer

code.sh

# Google Cloud Multi-Regional Load Balancer Setup for Cloud Run

# Prerequisites:
# - Google Cloud SDK installed and initialized
# - Cloud Run services deployed in desired regions

# Step 1: Define Variables
# Replace these variables with your specific service names, regions, and project details
SERVICE_NAMES=("service1" "service2") # Example service names
REGIONS=("us-central1" "europe-west1") # Example regions
PROJECT_ID="your-project-id"
NEG_NAMES=("neg-us" "neg-eu") # Example NEG names, corresponding to each service and region

# Step 2: Create Serverless Network Endpoint Groups (NEGs) for Each Cloud Run Service
for i in "${!SERVICE_NAMES[@]}"; do
  gcloud compute network-endpoint-groups create "${NEG_NAMES[$i]}" \
    --region="${REGIONS[$i]}" \
    --network-endpoint-type=SERVERLESS \
    --cloud-run-service="${SERVICE_NAMES[$i]}" \
    --project="${PROJECT_ID}"
done

# Step 3: Create a Global Backend Service
BACKEND_SERVICE_NAME="my-backend-service"
gcloud compute backend-services create "${BACKEND_SERVICE_NAME}" \
  --global \
  --project="${PROJECT_ID}"

# Attach NEGs to the Backend Service
for i in "${!REGIONS[@]}"; do
  gcloud compute backend-services add-backend "${BACKEND_SERVICE_NAME}" \
    --global \
    --network-endpoint-group="${NEG_NAMES[$i]}" \
    --network-endpoint-group-region="${REGIONS[$i]}" \
    --project="${PROJECT_ID}"
done

# Step 4: Create a URL Map
URL_MAP_NAME="my-url-map"
gcloud compute url-maps create "${URL_MAP_NAME}" \
  --default-service "${BACKEND_SERVICE_NAME}" \
  --project="${PROJECT_ID}"

# Step 5: Setup HTTP(S) Load Balancing (Choose one)

# Option A: Setup for HTTP
IP_NAME="my-global-ip"
HTTP_PROXY_NAME="my-http-proxy"
FORWARDING_RULE_NAME="my-http-forwarding-rule"

# Reserve a Global IP Address
gcloud compute addresses create "${IP_NAME}" --global --project="${PROJECT_ID}"

# Create an HTTP Proxy and Forwarding Rule
gcloud compute target-http-proxies create "${HTTP_PROXY_NAME}" \
  --url-map="${URL_MAP_NAME}" \
  --project="${PROJECT_ID}"

gcloud compute forwarding-rules create "${FORWARDING_RULE_NAME}" \
  --global \
  --target-http-proxy="${HTTP_PROXY_NAME}" \
  --ports=80 \
  --address="${IP_NAME}" \
  --project="${PROJECT_ID}"

# Option B: Setup for HTTPS (Uncomment and configure if using HTTPS)
# SSL_CERT_NAME="my-ssl-cert"
# HTTPS_PROXY_NAME="my-https-proxy"
# FORWARDING_RULE_NAME="my-https-forwarding-rule"
# 
# # Create an SSL Certificate (Replace with your certificate details)
# gcloud compute ssl-certificates create "${SSL_CERT_NAME}" \
#   --certificate="[CERTIFICATE_FILE]" \
#   --private-key="[PRIVATE_KEY_FILE]" \
#   --project="${PROJECT_ID}"
# 
# # Create an HTTPS Proxy and Forwarding Rule
# gcloud compute target-https-proxies create "${HTTPS_PROXY_NAME}" \
#   --url-map="${URL_MAP_NAME}" \
#   --ssl-certificates="${SSL_CERT_NAME}" \
#   --project="${PROJECT_ID}"
# 
# gcloud compute forwarding-rules create "${FORWARDING_RULE_NAME}" \
#   --global \
#   --target-https-proxy="${HTTPS_PROXY_NAME}" \
#   --ports=443 \
#   --address="${IP_NAME}" \
#   --project="${PROJECT_ID}"

# Step 6: Test Your Setup
# After setup, test by accessing the global IP or configuring a DNS A record pointing to it. Ensure traffic is routed to the closest region and fail-over works.

# Remember to replace placeholders with your actual project and service details. This script is a guideline; adjustments may be required based on your specific setup and requirements.