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Creating a CloudFront Distribution with Multiple Origins
As part of the Solutions Architect Associate Bootcamp from Digital Cloud Technology, we have completed a bunch of hands-on exercises and in-depth labs. One of our early in-depth labs was building a CloudFront Distribution with multiple custom origins. This allows us to demonstrate how to configure High Availability for a CloudFront Distribution.
The lab was broken down into 5 steps:
I found this lab to be straightforward and complex at the same time.
It was straightforward in that, from an implementation perspective, it is simple, as the diagram above shows.
The complexity came in all the small steps needed to make it work (establishing the s3 read-only IAM Role for the EC2 instances, configuring the security groups correctly, creating the Application Load Balancer in each region with the appropriate Target Group, configuring the Cloud Front distribution with 2 origins, one for the US region and one for the UK region, and an origin group to allow for the failover).
The web site landing page is coded to query the Instance Meta-data and return the Availability Zone, so using the ALB DNS name in each region will return the specific AZ for the region you are in.
To test the failover configuration, a security group was deleted from one of the regions to trigger routing to the other region. In my case, I deleted the security group from the US region and confirmed that the response page switched from the us-east to uk-west availability zones.
This was a fun lab to do and gave me insight into the level of detail needed to be able to successfully implement something in AWS.
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