3.6 Task 4—Scaling the PHP Front End

Lesson 8. What are You Going to Do?

Now that you have the front end and database separated, let’s take a look at how we can add some scalability and fault tolerance to the web tier.

Deploy Additional Web Tier Instances

In this section, you will take a snapshot of the web front end, and deploy two additional web tier instances from that snapshot.

Add a Load Balancer

Finally, you will add a load balancer in front of the three web instances. When this task is complete, you will have a scaled-out and fault-tolerant version of a sample two-tier web application.

After you complete this task, you will have a scaled-out and fault-tolerant version of a sample two-tier web application.

Amazon Lightsail Load Balancers

• Simple version of Amazon Elastic Load Balancer (ELB)
• Can be set up in a few clicks
• Have easy Secure Sockets Layer (SSL) certificates
• Handle HTTP or HTTPS traffic
• Balance traffic across ports 80 and 443

Horizontal Scaling with Snapshots

• Create a copy of Amazon Lightsail instance’s system disk includes instance configuration information (processing power, memory, data transfer, and disk size)
• Deploy a new identical instance or scale an instance to a larger size (cannot scale down)
• Allow for Lightsail instances to be exported to Amazon Elastic Compute Cloud (Amazon EC2)

Demonstration Video