Can you change an AWS Elastic Load Balancer health check without causing instances to go out of service?

Posted by Anton I. Sipos on Server Fault See other posts from Server Fault or by Anton I. Sipos
Published on 2011-11-14T23:27:30Z Indexed on 2011/11/15 1:57 UTC
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Filed under:

amazon-ec2

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load-balancing

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amazon-web-services

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amazon-elb

For a number of reasons I need to change the health check URL of a live site behind an ELB. The ELB is configured for health checks every 30 seconds, with a healthy threshold of 2 and unhealthy threshold of 2. I need to ensure I make this change with no outage. If I make the change to the health check URL, and assuming the URL checks successfully, will the instances stay healthy on the load balancer, or will they go out of service until they succeed 2 health checks (in 1 minute)?

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