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load_balancers_http_network.md

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SETUP NETWORK LOAD BALANCER

https://cloud.google.com/load-balancing/docs/network

set config

gcloud config set compute/zone us-central1-a

gcloud config set compute/region us-central1

create three VM instances

gcloud compute instances create www1
--image-family debian-9
--image-project debian-cloud
--zone us-central1-a
--tags network-lb-tag
--metadata startup-script="#! /bin/bash sudo apt-get update sudo apt-get install apache2 -y sudo service apache2 restart echo '<!doctype html>

www1

' | tee /var/www/html/index.html"

gcloud compute instances create www2
--image-family debian-9
--image-project debian-cloud
--zone us-central1-a
--tags network-lb-tag
--metadata startup-script="#! /bin/bash sudo apt-get update sudo apt-get install apache2 -y sudo service apache2 restart echo '<!doctype html>

www2

' | tee /var/www/html/index.html"

gcloud compute instances create www3
--image-family debian-9
--image-project debian-cloud
--zone us-central1-a
--tags network-lb-tag
--metadata startup-script="#! /bin/bash sudo apt-get update sudo apt-get install apache2 -y sudo service apache2 restart echo '<!doctype html>

www3

' | tee /var/www/html/index.html"

create firewall rules

gcloud compute firewall-rules create www-firewall-network-lb
--target-tags network-lb-tag --allow tcp:80

create an IP

gcloud compute addresses create network-lb-ip-1
--region us-central1

create an HTTP health checks

gcloud compute http-health-checks create basic-check

create a target pool with HTTP health check

gcloud compute target-pools create www-pool
--region us-central1 --http-health-check basic-check

add instances to the pool

gcloud compute target-pools add-instances www-pool
--instances www1,www2,www3

add forwarding rule to the pool

gcloud compute forwarding-rules create www-rule
--region us-central1
--ports 80
--address network-lb-ip-1
--target-pool www-pool

  • whenever a traffic comes to port 80 of address network-lb-ip-1, it is forwarded to the pool. the pool will forward the traffic to one of the instance

SETUP HTTP LOAD BALANCER

load balancer sends traffic to the backend instance group where VMs waiting to serve the request

create load balancer template (for the backend instance group)

gcloud compute instance-templates create lb-backend-template
--region=us-central1
--network=default
--subnet=default
--tags=allow-health-check
--image-family=debian-9
--image-project=debian-cloud
--metadata=startup-script='#! /bin/bash apt-get update apt-get install apache2 -y a2ensite default-ssl a2enmod ssl vm_hostname="$(curl -H "Metadata-Flavor:Google"
http://169.254.169.254/computeMetadata/v1/instance/name)" echo "Page served from: $vm_hostname" |
tee /var/www/html/index.html systemctl restart apache2'

create a managed instance group based on the template

gcloud compute instance-groups managed create lb-backend-group
--template=lb-backend-template --size=2 --zone=us-central1-a

create a firewall rule to allow health-check

gcloud compute firewall-rules create fw-allow-health-check
--network=default
--action=allow
--direction=ingress
--source-ranges=130.211.0.0/22,35.191.0.0/16
--target-tags=allow-health-check
--rules=tcp:80

create a static ip for the load balancer

gcloud compute addresses create lb-ipv4-1
--ip-version=IPV4
--global

see the address

gcloud compute addresses describe lb-ipv4-1
--format="get(address)"
--global

create health-check (it is not the legacy http-health-checks)

gcloud compute health-checks create http http-basic-check
--port 80

create backend service

gcloud compute backend-services create web-backend-service
--protocol=HTTP
--port-name=http
--health-checks=http-basic-check
--global

add instance group to backend service

gcloud compute backend-services add-backend web-backend-service
--instance-group=lb-backend-group
--instance-group-zone=us-central1-a
--global

create url-maps

--> route incoming request to default backend service --> set the default-service with url-maps gcloud compute url-maps create web-map-http
--default-service web-backend-service

create a target http proxy to route requests to URL map

gcloud compute target-http-proxies create http-lb-proxy
--url-map web-map-http

create forwarding rule to route request to the proxy

--> any request comes to port 80 of address lb-ipv4-1 will be forwarded to http-lb-proxy, which will forward to backend services using url-map

gcloud compute forwarding-rules create http-content-rule
--address=lb-ipv4-1
--global
--target-http-proxy=http-lb-proxy
--ports=80