Why does Elastic Load Balancing report 'Out of Service'?

Question

I am trying to set up Elastic Load Balancing (ELB) in AWS to split the requests between multiple instances. I have created several images of my webserver based on the same AMI,

Answer 1

If your web server is running fine, then it means the health check goes on a url that doesn't return 200.

A trick that works for me : go on the instance, type curl localhost:80/pathofyourhealthcheckurl

After you can adapt your health check url to always have a 200 response.