GCloud
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Information
GCloud Compute
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GCloud Compute Guide is still a work in progress; these are active notes from my current R&D.
shell gcloud compute --help
- This will display all of the commands that will help you utilize the
compute engine
.
- This will display all of the commands that will help you utilize the
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The are split into two major concepts, with
GROUP
andCOMMAND
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According to Google, the compute command helps create, configure and manipulate the virtual machines within your pre-set project.
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The
SYNOPSIS
isgcloud compute GROUP | COMMAND [GCLOUD_WIDE_FLAG ...]
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Load Balancer
Load balancing on the GCloud compuete platform.
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Command to run 3 instances of
nginx
with an ingress load balancer. Additional Documentation on Nginx Here-
Shell command for VM that is running nginx inside of a
debian
operating system.-
gcloud compute instances create www-server-1 \ --zone=us-west1-b \ --tags=network-lb-tag \ --machine-type=e2-medium \ --image-family=debian-11 \ --image-project=debian-cloud \ --metadata=startup-script=start_nginx.sh
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start_nginx.sh ->
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#!/bin/bash apt-get update apt-get install nginx -y
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For switching from Nginx to Apache2, replace the
nginx
withapache2
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To check the status on
ubuntu
, run thesudo systemctl status nginx
ORsudo systemctl status apache2
.
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Example of a Load Balance Template:
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The shell below is an example of an instance template that creates the load balance backend template.
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gcloud compute instance-templates create lb-backend-template \ --region=us-west1 \ --network=default \ --subnet=default \ --tags=allow-health-check \ --machine-type=e2-medium \ --image-family=debian-11 \ --image-project=debian-cloud \ --metadata=startup-script=start_nginx_script.sh
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Key concept is : Managed instance groups MIGs
- Mage instance groups or MIGs enable you to operate applications on multiple identical / clone virtual machines, thus allowing your orchestration to become scalable and highly available. This is done by utilizing the components within the automated MIG services, which includes: autoscaling, autohealing, regional (multiple zone) deployment, and automatic updating.
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Manage Instance Group for the load balancer:
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gcloud compute instance-groups managed create lb-backend-group \ --template=lb-backend-template --size=2 --zone=us-west1-b
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Health Check:
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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 ```
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Backend-Services for gcloud compute
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gcloud compute backend-services create web-backend-service \ --protocol=HTTP \ --port-name=http \ --health-checks=http-basic-check \ --global
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Add Instance Group as the Backend to the Backend Service:
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gcloud compute backend-services add-backend web-backend-service \ --instance-group=lb-backend-group \ --instance-group-zone=us-west1-b \ --global
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Create a URL Map for routing the requests to the default backend services.
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gcloud compute url-maps create web-map-http \ --default-service web-backend-service ```
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Extra information regarding the URL Map: Note: URL map is a Google Cloud configuration resource used to route requests to backend services or backend buckets. For example, with an external HTTP(S) load balancer, you can use a single URL map to route requests to different destinations based on the rules configured in the URL map: Requests for Video go to one backend service. Requests for Audio go to a different backend service. Requests for Images go to a Cloud Storage backend bucket. Requests for any other host and path combination go to a default backend service.
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Create a target HTTP proxy to route requests:
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gcloud compute target-http-proxies create http-lb-proxy \ --url-map web-map-http
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Global forwarding rule to route incoming requests to the proxy:
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gcloud compute forwarding-rules create http-content-rule \ --address=lb-ipv4-1\ --global \ --target-http-proxy=http-lb-proxy \ --ports=80
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Google Rules
Google Forwarding Rules
Note: A forwarding rule and its corresponding IP address represent the frontend configuration of a Google Cloud load balancer. Learn more about the general understanding of forwarding rules from the Forwarding rule overview Guide.