Part of the appeal of cloud computing is the promise of greater uptime. To achieve that, all parts of your architecture must be highly available, including the load balancer. Now you can achieve high availability (HA) for NGINX Plus on AWS with a new solution that combines keepalived
and the AWS Elastic IP address feature.
[Editor – For details about our other solution for highly available NGINX Plus on AWS in combination with the AWS Network Load Balancer (NLB), see our deployment guide.]
One widely used approach for HA on AWS is to put Elastic Load Balancer (ELB) in front of NGINX Plus instances. While this approach can be a good starting point, using ELB not only increases complexity and cost, but also imposes the following limitations:
CNAME
record; you cannot map a root domain (for example, example.com) to a CNAME
unless you delegate all DNS to Route 53.To avoid these limitations, our solution eliminates ELB in favor of a combination of keepalived
and an AWS Elastic IP address. An Elastic IP address is a single static IP address assigned to an active‑passive pair of NGINX Plus instances. If the primary NGINX Plus instance goes out of service, keeaplived
automatically promotes the backup instance to primary and transfers the Elastic IP address to it as shown in the figure.
For more information, including step‑by‑step instructions, see our deployment guide. For information about on‑premises high availability of NGINX Plus, including a solution based on keepalived
, see the NGINX Plus Admin Guide.
[Editor – For details about our other solution for highly available NGINX Plus on AWS in combination with AWS NLB, see our deployment guide.]
New to NGINX Plus on AWS? Try it free for 30 days. For links to the available AMIs, see Installing NGINX Plus AMIs on Amazon EC2.
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