blog-08-setup.sh

#!/bin/bash
set -e

#variables
INSTANCE_NAME=ps-media
ZONE=europe-west3-c
MEDIA_SERVER_NAME=cdn.example.com

# create the proxy-vm
gcloud compute instances create-with-container $INSTANCE_NAME-vm \
    --container-image gcr.io/cloud-marketplace/google/nginx1:1.15 \
    --machine-type f1-micro \
    --tags $INSTANCE_NAME-http \
    --zone $ZONE

gcloud compute instances add-metadata $INSTANCE_NAME-vm \
    --metadata-from-file user-data=vm-cloud-init.yaml \
    --zone $ZONE

gcloud compute instances update-container $INSTANCE_NAME-vm \
    --container-mount-host-path host-path=/var/nginx.conf,mount-path=/etc/nginx/nginx.conf,mode=ro \
    --zone $ZONE

# add firewall rule to allow loadbalancer and health-check to access this instance 
gcloud compute firewall-rules create $INSTANCE_NAME-allow-health-check \
    --allow tcp:80 \
    --source-ranges 130.211.0.0/22,35.191.0.0/16 \
    --target-tags $INSTANCE_NAME-http

# create the unmanaged instance group
gcloud compute instance-groups unmanaged create $INSTANCE_NAME-instance-group \
    --zone $ZONE

# add instance to this instance group 
gcloud compute instance-groups unmanaged add-instances $INSTANCE_NAME-instance-group \
      --instances $INSTANCE_NAME-vm \
      --zone $ZONE

# create the health check 
gcloud compute health-checks create http $INSTANCE_NAME-health-check \
  --request-path / \
  --port 80 \
  --check-interval 60 \
  --unhealthy-threshold 3 \
  --healthy-threshold 2 \
  --timeout 5 \
  --host $MEDIA_SERVER_NAME

# create the load balancer 

# create a backend service
gcloud compute backend-services create $INSTANCE_NAME-lb-backend \
  --http-health-checks $INSTANCE_NAME-health-check \
  --port-name http \
  --global \
  --enable-cdn \
  --connection-draining-timeout 300

# add the instance group to the backend
gcloud compute backend-services add-backend $INSTANCE_NAME-lb-backend \
  --instance-group $INSTANCE_NAME-instance-group \
  --instance-group-zone $ZONE \
  --balancing-mode UTILIZATION \
  --max-rate-per-instance 100 \
  --capacity-scaler 1.0 \
  --global

# create the url-map
gcloud compute url-maps create $INSTANCE_NAME-url-map \
  --default-service $INSTANCE_NAME-lb-backend

# create the http proxy
gcloud compute target-http-proxies create $INSTANCE_NAME-http-proxy \
  --url-map $INSTANCE_NAME-url-map

# create a global forwarding rule
gcloud compute forwarding-rules create $INSTANCE_NAME-forwarding-rule \
  --global \
  --ports 80 \
  --target-http-proxy $INSTANCE_NAME-http-proxy