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We are trying to put up a maintenance webpage for our customers, when our application is down for whatever reason.

Say we have an Application Load Balancer on AWS.

How do we setup an ALB to re-route to a different target group if all checks are failing? Say there are 2 target groups, one is the "primary" target group. And if all instances in that TG are unhealthy, is there a way to then route to a different target group, or a different URL or something?

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    Suspect you'd have to use a lambda to detect the state and update the target group. – Tim Sep 24 '19 at 23:21
  • how would that work? How would the lambda get notified of the change? – MrCholo Sep 25 '19 at 6:52
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You could use AWS Lambda to monitor the ALB. If the healthy host count falls to zero you could trigger a lambda which changes the target group.

This blog post has a good outline on how to do something somewhat similar, though you'll have to extend it yourself. Basically Cloudwatch Events triggers lambda.

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