How to stop loadbalancer's re-invoke function?-CodePudding

I have lambda's and ecs

lambda controls start/stop the ecs.

However when stopping the ecs with stop_task, it is revoked immediately by LoadaBalancer

I should stop the LoadBalancer at the same time with stop_task

Or is there any way to stop the only LoadBalancer's re-invoke function?

For example stop is like this,

import json
import boto3

ecs = boto3.client('ecs')

def lambda_handler(event, context):
    temp = ecs.list_tasks(
        cluster='ss-dev-cluster'
    )
    for t in temp['taskArns']:
    
        response = ecs.stop_task(
            cluster='ss-dev-cluster',
            task=t
        )
    
        print(response)
        '''
        failures = response['failures']
        if len(failures) != 0:
            print(failures)
            return {
                'statusCode': 500,
                'body': json.dumps('NG!')
            }
        '''
    return {
        'statusCode': 200,
        'body': json.dumps('OK!')
    }

Solved

Thanks to @MarkB

I use update_service to change the desiredCount of Fargate instead of run_task and stop_task

These are my lambda code

import json
import boto3
import os

ecs = boto3.client('ecs')

def lambda_handler(event, context):
 
    response = ecs.update_service(
        cluster=os.environ['cluster'],
        desiredCount=1,
        service=os.environ['service'],
    )

CodePudding user response：

Since you are running a load balanced application, you are not just running an ECS task, you are running an ECS service. When running an ECS service you should never be calling run_task or stop_task directly. You should be setting the desired count of the ECS service and letting the ECS service control the stopping/starting of tasks. It is the ECS service that keeps recreating the task after you stop it, not the load balancer. The ECS service also controls the registration/deregistration of the tasks with the load balancer.