Deploy Spring Boot applications onto AWS ECS Fargate using AWS CDK. > Create ECS Service with CDK > Configure AWS ALB Target Group and Health Check Mechanism

Configure AWS ALB Target Group and Health Check Mechanism

First, create a target group from the applicationListener using the .addTargets method with an ID of ProductsServiceAlbTarget:

applicationListener.addTargets("ProductsServiceAlbTarget",
       AddApplicationTargetsProps.builder()
           .build()
   );

Architect

Set the target group name to productsServiceAlb:

.targetGroupName("productsServiceAlb")

Architect

Next, specify port 8081 for the Load Balancer to send traffic to, using the HTTP protocol to communicate with the targets:

.port(8081)
.protocol(ApplicationProtocol.HTTP)

Architect

Next, add the list of Fargate services to the target group:

.targets(Collections.singletonList(fargateService))

Architect

Next, define the deregistration delay of 30 seconds, allowing the Load Balancer to wait before deregistering an unavailable target:

.deregistrationDelay(Duration.seconds(30))

Architect

Next, configure the health check and enable health check to ensure that targets are operating correctly:

.healthCheck(HealthCheck.builder()
       .enabled(true)
       .build())

Architect

Kế tiếp chúng ta sẽ cấu hình khoảng thời gian giữa các lần kiểm tra sức khỏe là 30 giây và thời gian tối đa để chờ đợi phản hồi từ một target trong mỗi lần kiểm tra là 10 giây

.interval(Duration.seconds(30))
.timeout(Duration.seconds(10))

Architect

Finally, declare the endpoint used to check the health of targets as /actuator/health with port 8081 used in the health check to communicate with targets:
```
.path("/actuator/health")
.port(8081)
```

Architect