CODEWITHSUNDEEP
amazon-web-services.net-coreamazon-elastic-beanstalkaws-application-load-balancerhealth-check
user2650277
user2650277

Reputation: 6729

ELB health check hitting wrong endpoint

My .NET Core Elastic beanstalk app is healthy but when i check the logs i see the following:

10.3.12.142 - - [06/Feb/2022:17:54:53 +0000] "GET / HTTP/1.1" 404 0 "-" "ELB-HealthChecker/2.0" "10.3.2.20"
10.3.11.145 - - [06/Feb/2022:17:54:57 +0000] "GET / HTTP/1.1" 404 0 "-" "ELB-HealthChecker/2.0" "10.3.1.114"
10.3.11.145 - - [06/Feb/2022:17:55:07 +0000] "GET /_system/health HTTP/1.1" 200 232 "-" "ELB-HealthChecker/2.0" "-"
10.3.12.142 - - [06/Feb/2022:17:55:07 +0000] "GET /_system/health HTTP/1.1" 200 232 "-" "ELB-HealthChecker/2.0" "-"
10.3.11.145 - - [06/Feb/2022:17:55:07 +0000] "GET / HTTP/1.1" 404 0 "-" "ELB-HealthChecker/2.0" "10.3.1.114"
10.3.11.145 - - [06/Feb/2022:17:55:22 +0000] "GET /_system/health HTTP/1.1" 200 237 "-" "ELB-HealthChecker/2.0" "-"
10.3.12.142 - - [06/Feb/2022:17:55:22 +0000] "GET /_system/health HTTP/1.1" 200 237 "-" "ELB-HealthChecker/2.0" "-"

/_system/health is the real health endpoint but i don't understand why ELB is hitting / instead of just /_system/health which ofcourse result in 404 which is expected from the app.

I have the following terraform config for health check and i don't use .ebextensions

setting {
    namespace = "aws:elasticbeanstalk:environment:process:default"
    name      = "HealthCheckPath"
    value     = "/_system/health"
  }

  setting {
    namespace = "aws:elasticbeanstalk:application"
    name      = "Application Healthcheck URL"
    value     = "/_system/health"
  }

Edit 1

After i change the healthcheck path to /health(thanks @Marcin i notice that ELB-HealthChecker is still hitting /

10.3.11.145 - - [07/Feb/2022:08:35:08 +0000] "GET /health HTTP/1.1" 200 227 "-" "ELB-HealthChecker/2.0" "-"
10.3.12.142 - - [07/Feb/2022:08:35:08 +0000] "GET /health HTTP/1.1" 200 232 "-" "ELB-HealthChecker/2.0" "-"
10.3.12.142 - - [07/Feb/2022:08:35:13 +0000] "GET / HTTP/1.1" 404 0 "-" "ELB-HealthChecker/2.0" "10.3.2.20"

Upvotes: 1

Views: 1990

Answers (1)

Marcin
Marcin

Reputation: 238081

/_system/health is not supported. The valid paths are:

/ (HTTP GET to root path)

/health

HTTPS:443/

HTTPS:443/health

Upvotes: 1

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