Challenge 1 - Create Managed Instance Groups

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Introduction

A managed instance group uses an instance template to create a group of identical instances. Use these to create the backend of the HTTP Load Balancer.

Description

Create Instance Template

Create an instance template with the following configuration:
- Name: lb-backend-template
- Series: N1
- Networking:
  - Use the default Network and Subnet(us-east1)
  - Add a network tag named allow-health-check
    
    NOTE: The network tag allow-health-check ensures that the HTTP Health Check and SSH firewall rules apply to these instances.
    
    NOTE: Make sure to type a space or press tab after typing the tag name, otherwise it might not get set.
- Startup Script:
```
  #! /bin/bash
  sudo apt-get update
  sudo apt-get install apache2 -y
  sudo a2ensite default-ssl
  sudo a2enmod ssl
  export vm_hostname="$(hostname)"
  sudo echo "Page served from: $vm_hostname" | \
  sudo tee /var/www/html/index.html
```

Create Managed Instance Group

Create a new stateless managed instance group with the following configuration:
- Name: lb-backend-example
- Location: Single zone
- Region: us-east1
- Zone: us-east1-b
- Instance template: lb-backend-example
- Autoscaling: Don’t autoscale
- Number of instances: 1

Add A Named Port

For your instance group, set port 80 as a “named port” port. This allows the load balancing service to forward traffic to the named port.

Success Criteria

You’ve created an instance template which defines instance properties including type, boot disk image, and subnet
Your instance template is configured to allow health checks
You’ve created a new managed instance group as the HTTP backend
A port is configured to allow the load balancing service to forward traffic to the backend