EC2 instance attached to a load balancer is showing Unhealthy status

╄→尐↘猪︶ㄣ 提交于 2020-12-30 06:50:54

问题


I created a load balancer and assigned it one of the running EC2 instance. After creation, I navigated to Target Group section in the AWS Console under Load Balancing and when I selected the target group that was assigned to the load balancer, it shows registered instance status as "Unhealthy" and there was a message above registered instance pane that says "None of these Availability Zones contains a healthy target. Requests are being routed to all targets". While creating the load balancer, I selected all the subnets (availability zones). settings I used for health check are mentioned below,

  • Protocol: HTTP
  • Path: /healthcheck.html
  • Port: traffic port
  • Healthy threshold: 3
  • Unhealthy threshold: 2
  • Timeout: 5
  • Interval: 10
  • Success codes: 200

So why does my registered instance status as "Unhealthy" and how can I rectify/resolve that to change the status to "In-service"?


回答1:


Unhealthy indicates that the health check is failing for the instance.

Things to check:

  • Check that the instance is running a web server
  • Check that the web page at healthcheck.html responds with a valid 200 response
  • Check that instance has a security group that permits access on Port 80 (HTTP)



回答2:


If you are sharing the load balancer among several EC2 instances that run similar services, make sure each of your services run in a different port otherwise your service won't be reachable and therefore your health check won't pass



来源:https://stackoverflow.com/questions/47766584/ec2-instance-attached-to-a-load-balancer-is-showing-unhealthy-status

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