Setting Up HTTP(S) Load Balancer in GCP

Disclaimer: This is note from my self learning in GCP and may not be correct or complete. Qwiklabs https://google.qwiklabs.com/focuses/10258?parent=catalog

 

In general these are the steps:

• Create an instance template.

• Create a target pool.

• Create a managed instance group.

• Create a firewall rule to allow traffic (80/tcp).

• Create a health check.

• Create a backend service, and attach the managed instance group.

• Create a URL map, and target the HTTP proxy to route requests to your URL map.

• Create a forwarding rule.

#create startup.sh script

cat << EOF > startup.sh

#! /bin/bash

apt-get update

apt-get install -y nginx

service nginx start

sed -i -- 's/nginx/Google Cloud Platform - '"\$HOSTNAME"'/' /var/www/html/index.nginx-debian.html

EOF

#create instance template

gcloud compute instance-templates create nginx-template \

   --metadata-from-file startup-script=startup.sh

#create a target pool

gcloud compute target-pools create nginx-pool 

#create a managed instance group

gcloud compute instance-groups managed create nginx-group \

   --template=nginx-template --size=2 --target-pool nginx-pool

#Create a firewall rule to allow traffic (80/tcp)

gcloud compute firewall-rules create www-firewall \

  --allow tcp:80

#Create a forwarding rule

gcloud compute forwarding-rules create nginx-fwd-rule \

        --ports=80 \

        --target-pool nginx-pool

gcloud compute forwarding-rules list

#Create a health check

gcloud compute http-health-checks create basic-check

gcloud compute instance-groups managed set-named-ports nginx-group --named-ports http:80

#Create a backend service, and attach the managed instance group

gcloud compute backend-services create web-backend-service \

        --protocol=HTTP \

        --port-name=http \

        --http-health-checks=basic-check \

        --global

gcloud compute backend-services add-backend web-backend-service \

        --instance-group=nginx-group \

        --instance-group-zone=us-east1-b \

        --global

#Create a URL map, and target the HTTP proxy to route requests to your URL map

gcloud compute url-maps create web-map-http \

        --default-service web-backend-service

gcloud compute target-http-proxies create http-lb-proxy \

        --url-map web-map-http

gcloud compute forwarding-rules create http-content-rule \

--global --target-http-proxy http-lb-proxy --ports 80