High availability HA website load balanced across both Azure and AWS

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I have a client who would like their website served via a HA infrastructure spread across both AWS and Azure (for their own reasons). My understanding is that this is not possible - you pick either AWS and Azure, then have your load balancer sit in either stack and autoscale (using, for example, Elastic Load Balancing across EC2 instances in AWS).

Is my understanding wrong? Is this indeed possible?
Jul 6, 2018 in DevOps on Cloud by Nilesh
• 7,050 points

1 answer to this question.

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DNS load balancing is the practice of configuring a domain in the Domain Name System (DNS) such that client requests to the domain are distributed across a group of server machines. A domain can correspond to a website, a mail system, a print server, or another service that is made accessible via the Internet.

In your case, the group of servers are spread across cloud providers. Lots of caveats and challenges, but it is possible.

You can take this idea is use GeoDNS with health checks.Traffic would be split based on geographic regions, which wouldn't necessarily be even, but the health checks could help redirect traffic if one cloud went down.
answered Jul 6, 2018 by Kalgi
• 52,360 points

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