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Showing content from http://cloud.google.com/compute/docs/tutorials/globally-autoscaling-a-web-service-on-compute-engine below:

Globally autoscaling a web service on Compute Engine | Compute Engine Documentation

The application includes the following Compute Engine components:

1. Instance template: A template used to create each instance in the instance groups.
2. Instance groups: Multiple instance groups that autoscale based on incoming traffic.
3. Load balancer: An HTTP load balancer that distributes traffic among the instance groups.
4. Instances: Multiple testing instances to generate test traffic from different parts of the globe.

1. Create a network for the instance groups.

   1. In the Google Cloud console, go to the VPC networks page.

      Go to VPC networks

   2. Click Create VPC Network.

   3. Set the Name to fortressnet.

   4. Set Subnet creation mode to Automatic.

   5. Click Create at the bottom of the page.

2. Create a firewall rule for the network. This rule will allow all HTTP requests sent to your instances.

   1. In the Google Cloud console, go to the Firewall rules page.

      Go to Firewall rules

   2. Click Create Firewall Rule.

   3. Set the Name to fortressnet-allow-http.

   4. For Network select fortressnet.

   5. For Targets select All instances in the network.

   6. Set Source IPv4 ranges to 0.0.0.0/0.

   7. For Protocols and ports, choose Specified protocols and ports and then select the tcp checkbox and enter 80.

   8. Click Create.

3. Create an instance template. Include a startup script that starts up a simple Apache web server on each instance.

   1. In the Google Cloud console, go to the Instance templates page.

      Go to Instance templates

   2. Click Create instance template.

   3. Set the Name to fort-template.

   4. For Machine configuration, select e2-micro (2 vCPU, 1 GB memory).

   5. In the Advanced options section, expand Networking, and then do the following:

      1. In the Network interfaces section, expand the network interface to edit it.
      2. For Network, select fortressnet.

   6. In the Management section, for Automation enter the following Startup script:

      apt update && apt -y install apache2
      

   7. Click Create.

4. Create multiple regional managed instance groups using the instance template. Configure autoscaling for each instance group.

   1. In the Google Cloud console, go to the Instance groups page.

      Go to Instance groups

   2. Click Create instance group to create a new managed instance group.

   3. Select New managed instance group (stateless).

   4. Set the Name to us-central1-pool.

   5. For Instance template, select fort-template.

   6. For Location, select Multiple zones.

   7. For Region, select us-central1. For Zones, leave the predefined values selected.

   8. For Autoscaling mode, select On: add and remove instances to the group.

   9. Set Minimum number of instances to 1.

   10. Set Maximum number of instances to 5.

   11. For Autoscaling signals, edit the default selection (CPU utilization) and set the Signal type to HTTP load balancing utilization.

   12. Set Target HTTP load balancing utilization to 80.

   13. Click Done.

   14. Click Create. A dialog displays the message that you must also assign the instance group to a backend service of an HTTP load balancer.

   15. In the confirmation dialog, click Confirm. You can configure the load balancer after you create all the instance groups.

   16. Repeat these steps to create two more instance groups with the following changes:

       • Create a group with Name as europe-west1-pool and Region as europe-west1.
       • Create a group with Name as asia-east1-pool and Region as asia-east1.
   Note: Autoscaling of instance groups can be based on different criteria. Because your web service employs a Load Balancer, your autoscalers should be configured to scale based on load balancing usage. For more information, see Scaling based on load balancing serving capacity.

5. (Optional) Verify the instances are healthy and serving HTTP traffic. Test the external IP address of one or more instances. You might need to wait a minute for the instances to finish the startup process.

   1. In the Google Cloud console, go to the VM instances page.

      Go to VM instances

   2. Verify that each running instance has a green checkmark in the Status column next to the name of your instance group.

   3. Copy an instance's External IP and paste it into a web browser.

   You should see the 'Apache2 Debian Default Page' web page.

   If it doesn't seem to work, try waiting a few moments.

1. Create a network for the instance groups.

   gcloud compute networks create fortressnet --subnet-mode auto
   

2. Create a firewall rule for the network. This rule will allow all HTTP requests sent to your instances.

   gcloud compute firewall-rules create fortressnet-allow-http \
       --network fortressnet \
       --allow tcp:80
   

3. Create an instance template. Include a startup script that starts up a simple Apache web server on each instance.

   gcloud compute instance-templates create fort-template \
       --machine-type e2-micro \
       --network fortressnet \
       --metadata startup-script='apt update && apt -y install apache2'
   

4. Create multiple regional managed instance groups using the instance template. Configure autoscaling for each instance group.

   gcloud compute instance-groups managed create us-central1-pool \
       --region us-central1 \
       --template fort-template \
       --size 1
   gcloud compute instance-groups managed set-autoscaling us-central1-pool \
       --region us-central1 \
       --min-num-replicas 1 \
       --max-num-replicas 5 \
       --scale-based-on-load-balancing \
       --target-load-balancing-utilization .8
   

   gcloud compute instance-groups managed create europe-west1-pool \
       --region europe-west1 \
       --template fort-template \
       --size 1
   gcloud compute instance-groups managed set-autoscaling europe-west1-pool \
       --region europe-west1 \
       --min-num-replicas 1 \
       --max-num-replicas 5 \
       --scale-based-on-load-balancing \
       --target-load-balancing-utilization .8
   

   gcloud compute instance-groups managed create asia-east1-pool \
       --region asia-east1 \
       --template fort-template \
       --size 1
   gcloud compute instance-groups managed set-autoscaling asia-east1-pool \
       --region asia-east1 \
       --min-num-replicas 1 \
       --max-num-replicas 5 \
       --scale-based-on-load-balancing \
       --target-load-balancing-utilization .8
   

   Note: Autoscaling of instance groups can be based on different criteria. Because your web service employs a Load Balancer, your autoscalers should be configured to scale based on load balancing usage. For more information, see Scaling based on load balancing serving capacity.

5. (Optional) Verify the instances are healthy and serving HTTP traffic. Test the external IP address of one or more instances. You might need to wait a minute for the instances to finish the startup process.

   1. List your instances.

      gcloud compute instances list
      

   2. Verify under the STATUS column that the instances are RUNNING.

   3. Check an instance by querying it's IP address under the EXTERNAL_IP column.

      curl http://EXTERNAL_IP | head
      

   You should see some HTML text, including the line <title>Apache2 Debian Default Page: It works</title>.

   If it doesn't seem to work, try waiting a few moments.

The load balancer will distribute client requests among your multiple backends.

1. In the Google Cloud console, go to the Load balancing page.

   Go to Load balancing

2. Click Create load balancer.
3. For Type of load balancer, select Application Load Balancer (HTTP/HTTPS) and click Next.
4. For Public facing or internal, select Public facing (external) and click Next.
5. For Global or single region deployment, select Best for global workloads and click Next.
6. For Load balancer generation, select Global external Application Load Balancer and click Next.
7. Click Configure.

1. Set the Load balancer name as fortressnet-balancer.

1. On the Create global external Application Load Balancer page, click Backend configuration.
2. In the Create or select backend services & backend buckets pull-down menu, select Backend services, then Create a backend service. You should see the Create Backend Service dialog box.
3. Set the Name of the backend service to fortressnet-backend-service.
4. Under the New backend dialog box, set Instance group to asia-east1-pool.
5. For Balancing mode select Rate.
6. Set Maximum RPS to 100 RPS per instance.
7. Click Done.
8. Click Add backend.
9. Under the New backend dialog box, set Instance group to europe-west1-pool.
10. For Balancing mode select Rate.
11. Set Maximum RPS to 100 RPS per instance.
12. Click Done.
13. Click Add backend.
14. Under the New backend dialog box, set Instance group to us-central1-pool.
15. For Balancing mode select Rate.
16. Set Maximum RPS to 100 RPS per instance.
17. Click Done.
18. Under Health check, select Create a health check.
19. Set the Name to http-basic-check.
20. For Protocol select HTTP.
21. Set Port to 80.
22. Click Save and continue.
23. Click Create.

1. On the left panel of the Create global external Application Load Balancer page, click Host and path rules.
   For this example, we don't need to configure any host or path rules since all traffic will go to the default rule. So, we can accept the pre-populated default values.

1. On the left panel of the Create global external Application Load Balancer page, click Frontend configuration.
2. Set Name to fortressnet-http-rule.
3. For IP version select IPv4.
4. For IP address select Create IP address.
5. In the Reserve a new static IP dialog box, set Name to fortressnet-ip.
6. Click Reserve and wait a few moments.
7. Click Done at the bottom of the New Frontend IP and port dialog box.
8. Click Add frontend IP and port.
9. Set Name to fortressnet-http-ipv6-rule.
10. For IP version select IPv6.
11. For IP address select Create IP address.
12. In the dialog box, set Name to fortressnet-ipv6.
13. Click Reserve and wait a few moments.
14. Click Done at the bottom of the New Frontend IP and port dialog box.

1. On the left panel of the Create global external Application Load Balancer page, click Review and finalize.
2. Compare your settings to what you intended to create.
3. If the settings are correct, click Create at the bottom of the left panel. You are returned to the Load balancing screen. After the load balancer is created, a green check mark next to it indicates that it is running.

1. Create a basic health check. This will check whether a load balancer backend is responding to HTTP requests.

   gcloud compute health-checks create http http-basic-check
   

2. Create a global backend service. This backend service will receive HTTP traffic from the load balancer.

   gcloud compute backend-services create fortressnet-backend-service \
       --protocol HTTP \
       --health-checks http-basic-check \
       --global
   

3. Add the instance groups as regional backends of the backend service. This configuration will distribute traffic among the backends based on a maximum number of requests per second (RPS) per instance.

   gcloud compute backend-services add-backend fortressnet-backend-service \
       --balancing-mode RATE \
       --max-rate-per-instance 100 \
       --instance-group us-central1-pool \
       --instance-group-region us-central1 \
       --global
   gcloud compute backend-services add-backend fortressnet-backend-service \
       --balancing-mode RATE \
       --max-rate-per-instance 100 \
       --instance-group europe-west1-pool \
       --instance-group-region europe-west1 \
       --global
   gcloud compute backend-services add-backend fortressnet-backend-service \
       --balancing-mode RATE \
       --max-rate-per-instance 100 \
       --instance-group asia-east1-pool \
       --instance-group-region asia-east1 \
       --global
   

1. Define a URL map. URL maps route different URLs to different backend services. Since we only have one backend service, we'll simply set that backend service as the default service for all URLs.

   gcloud compute url-maps create fortressnet-balancer \
       --default-service fortressnet-backend-service
   

2. Create an HTTP proxy route. HTTP proxy routes accept HTTP requests and route them according to your URL map. In this case, it will send all requests to your single backend service.

   gcloud compute target-http-proxies create fortressnet-http-proxy \
       --url-map fortressnet-balancer
   

1. Create two global static external IP addresses: one for IPv4 and one for IPv6. These will be the global external IP addresses of the load balancer.

   gcloud compute addresses create fortressnet-ip \
       --ip-version IPV4 \
       --network-tier=PREMIUM \
       --global
   gcloud compute addresses create fortressnet-ipv6 \
       --ip-version IPV6 \
       --network-tier=PREMIUM \
       --global
   

2. Lookup the external IP addresses of the load balancer.

   gcloud compute addresses list
   

3. Create global forwarding rules for the external IP addresses. This will forward both IPv4 and IPv6 HTTP requests to your HTTP proxy.

   gcloud compute forwarding-rules create fortressnet-http-rule \
       --load-balancing-scheme=EXTERNAL \
       --network-tier=PREMIUM \
       --global \
       --target-http-proxy fortressnet-http-proxy \
       --ports 80 \
       --address LOAD_BALANCER_IP_ADDRESS
   

   gcloud compute forwarding-rules create fortressnet-http-ipv6-rule \
       --load-balancing-scheme=EXTERNAL \
       --network-tier=PREMIUM \
       --global \
       --target-http-proxy fortressnet-http-proxy \
       --ports 80 \
       --address LOAD_BALANCER_IPV6_ADDRESS
   

(Optional) Verify the load balancer is working. You may need to wait a minute or three.

1. In the Google Cloud console, go to the Load balancing page.

   Go to Load balancing

2. Wait for fortressnet-balancer to have a green check mark under the Backends column.

3. Click on fortressnet-balancer.

4. Under Frontend copy the IPv4 address under the IP:Port column. (IPv4 addresses are of the form www.xxx.yyy.zzz. You don't need the trailing port number :nn.) If the Frontend section is missing, try waiting a few moments and then reloading the web page.

5. Enter the IP address in a web browser.

You should see the 'Apache2 Debian Default Page' web page.

If you get an 'Error 404 (Not Found)' web page instead, try waiting a few more minutes.

1. Lookup the external IP addresses of the load balancer.

   gcloud compute addresses list
   

2. Query the IPv4 address. (IPv4 addresses are of the form www.xxx.yyy.zzz.)

   curl http://LOAD_BALANCER_IP_ADDRESS | head
   

You should see some HTML text, including the line <title>Apache2 Debian Default Page: It works</title>.

If you see <title>Error 404 (Not Found)!!1</title> instead, try waiting a few more minutes.

Best Practice: Create a secure firewall to allow only internal traffic from the load balancer and the health check. Then delete the original firewall that allowed any HTTP request. This prevents individual instances from being accessible by outside clients.

1. Create a new firewall only allowing traffic from the load balancer and the health check.

   1. In the Google Cloud console, go to the Firewall rules page.

      Go to Firewall rules

   2. Click Create Firewall Rule.

   3. Set the Name to fortressnet-allow-load-balancer.

   4. For Network select fortressnet.

   5. For Targets select All instances in the network.

   6. For Source IP ranges type 130.211.0.0/22 and press the Enter key, then type 35.191.0.0/16 and press Enter again.

   7. Under Protocols and ports select tcp and enter 80.

   8. Click Create.

2. Delete the old allow-everything firewall.

   1. Select the checkmark next to fortressnet-allow-http.
   2. Click Delete at the top of the page.
   3. In the dialog box, click Delete.

1. Create a new firewall only allowing traffic from the load balancer and the health check.

   gcloud compute firewall-rules create fortressnet-allow-load-balancer \
       --network fortressnet \
       --source-ranges 130.211.0.0/22,35.191.0.0/16 \
       --allow tcp:80
   

2. Delete the old allow-everything firewall.

   gcloud compute firewall-rules delete fortressnet-allow-http -q
   

Suppose it is morning in Europe and your web service suddenly goes viral on the internet. Generate a high number of client requests all at once from Europe.

1. Create an instance installed with the Siege load testing tool.

   1. In the Google Cloud console, go to the Create an instance page.

      Go to Create an instance

   2. Set the Name to europe-loadtest.

   3. For Region select europe-west1.

   4. For advanced settings, expand the Advanced options section, and do the following:

      1. Expand the Management section.
      2. In the Automation field, enter the following startup script:

         apt -y install siege
         

   5. To create the VM, click Create.

2. Get the IPv4 address of the load balancer.

   1. In the Google Cloud console, go to the Load balancing page.

      Go to Load balancing

   2. Click fortressnet-balancer.

   3. Under Frontend copy the IPv4 address under the IP:Port column. (IPv4 addresses are of the form www.xxx.yyy.zzz.)

3. SSH into the load testing instance.

   1. In the Google Cloud console, go to the VM instances page.

      Go to VM instances

   2. Wait for the europe-loadtest instance to have a green checkmark under the Name column.

   3. Click SSH on europe-loadtest under the Connect column.

4. Start siege. Target the IPv4 address of the load balancer.

   siege -c150 http://LOAD_BALANCER_IP_ADDRESS
   

1. Create an instance installed with the Siege load testing tool.

   gcloud compute instances create europe-loadtest \
       --network default \
       --zone europe-west1-c \
       --metadata startup-script='apt -y install siege'
   

2. Get the IPv4 address of the load balancer.

   gcloud compute addresses list
   

3. Open a new shell session where the gcloud command is available.

   Note: If you are using Cloud Shell, you can open multiple shell sessions in the same browser window. See the Cloud Shell documentation on Opening Multiple Sessions.

   1. In your new shell session, SSH into the load testing instance.

      gcloud compute ssh --zone europe-west1-c europe-loadtest
      

   2. Start siege. Target the IPv4 address of the load balancer.

      siege -c150 http://LOAD_BALANCER_IP_ADDRESS
      

After running the siege command you should see output declaring The server is now under siege...

[alert] Zip encoding disabled; siege requires zlib support to enable it
** SIEGE 4.0.2
** Preparing 150 concurrent users for battle.
The server is now under siege...

1. In the Google Cloud console, go to the Load balancing page.

   Go to Load balancing

2. Click the load balancer named fortressnet-balancer.

3. Click the Monitoring tab.

4. In the Backend drop-down, select fortressnet-backend-service.

It may take up to ten minutes to display enough data. Soon you should see a display similar to the following:

What's happening here:

1. The load test starts sending a large amount of traffic all at once. At first, the load balancer distributes requests equally among the three backends. The number of requests quickly exceeds your autoscaling limits, and may even cause your servers to return Backend 5xx errors which will show up on the monitoring display. The autoscaler starts to spin up additional instances as needed.

2. Autoscaling catches up with capacity needs. To minimize request latency, Compute Engine load balancers try to route requests to the backend that is closest to the client. In this case, since the load test traffic originates from Europe, the load balancer prefers to route more requests to the Europe backend. As a result, autoscaling may spin up more instances in the Europe backend to handle a higher fraction of requests.

Suppose your web service also catches on in Asia with the afternoon internet crowd. Generate a high number of requests from Asia.

1. To create another instance installed with the Siege load testing tool, do the following:

   1. In the Google Cloud console, go to the VM instances page.

      Go to VM instances

   2. Click Create instance.

   3. Set the Name to asia-loadtest.

   4. For Region select asia-east1.

   5. Expand the Advanced options section.

   6. Expand the Management section.

   7. In the Automation section, enter the following startup script:

      apt -y install siege
      

   8. Click Create.

2. To get the IP address of the load balancer, do the following:

   1. In the Google Cloud console, go to the Load balancing page.

      Go to Load balancing

   2. Click fortressnet-balancer.

   3. Under Frontend copy the IPv4 address under the IP:Port column. (IPv4 addresses are of the form www.xxx.yyy.zzz.)

3. SSH into the load testing instance.

   1. Wait for the asia-loadtest instance to have a green checkmark under the Name column.
   2. Click SSH on asia-loadtest under the Connect column.

4. Start siege. Target the IPv4 address of the load balancer.

   siege -c150 http://LOAD_BALANCER_IP_ADDRESS
   

1. In your original shell session, create another instance installed with the Siege load testing tool.

   gcloud compute instances create asia-loadtest \
       --network default \
       --zone asia-east1-c \
       --metadata startup-script='apt -y install siege'
   

2. Get the IPv4 address of the load balancer.

   gcloud compute addresses list
   

3. Open a new shell session where the gcloud command is available.

   1. In your new shell session, SSH into the load testing instance.

      gcloud compute ssh --zone asia-east1-c asia-loadtest
      

   2. Start siege. Target the IPv4 address of the load balancer.

      siege -c150 http://LOAD_BALANCER_IP_ADDRESS
      

Again, you should see output declaring The server is now under siege...

[alert] Zip encoding disabled; siege requires zlib support to enable it
** SIEGE 4.0.2
** Preparing 150 concurrent users for battle.
The server is now under siege...

Go back to the load balancing monitoring display from last time. It may take up to ten minutes to display enough new data. Soon you should see a display similar to the following:

What's happening here:

1. Again, the load test sends another large number of requests all at once. At first the load balancer distributes requests equally among the existing three backends. As the number of requests exceeds your autoscaling limits, the autoscaler starts to spin up additional instances as needed.

2. Autoscaling catches up with the new capacity needs. The load balancer still prefers to route requests to the nearest available backends. As a result, eventually the Asia backend receives requests mostly from Asia, the Europe backend receives requests mostly from Europe, and the US backend receives everything else.

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