如何为ecs任务增加预热时间？

Question

I am using ecs tasks to deploy my services. However, recently noticing that when I do an update on the service, the first task that starts up usually gets taken down immediately because it fails load balancer health checks. I think this is because it needs more time (a second or two more) to startup. How can I configure this?

Answer 1

When updating the ECS Service with a new Task Definition , I'd suggest also setting the healthCheckGracePeriodSeconds parameter. See Service Definition Parameters for more details.

If you're using the cli, you should be able to do this with aws ecs update-service --cluster <value> --service <value> --health-check-grace-period-seconds <value> .

If for example, your HealthCheck interval is 30 seconds, and 2 unhealthy checks will cause the service to be replaced, but you know your service takes, say 65 seconds to start up, you could set --health-check-grace-period-seconds 95 , and this would tell ECS even if the service is considered unhealthy, let it keep going until 95 seconds would pass. I chose 95 in this case because the next healthcheck would be expected to come at 90 seconds, so if I did less than that, the load balancer may not notice the service is healthy before the unhealthy check takes effect.