What is the process for initiating a Fargate task once a database instance has been successfully provisioned using AWS CDK

I am currently working on an AWS CDK stack that involves creating a Fargate task (using 

ApplicationLoadBalancedFargateService
) from a docker container. The container houses a web application that needs to connect to a database. Upon deploying the CDK stack, I noticed that it takes approximately seven minutes for the database instance to be created. However, the Fargate task is launched much quicker, resulting in the task being stopped as it's unable to connect to the database which hasn't been fully created yet. This cycle repeats four times until the database is finally created.

My question - is there a way within the CDK code to delay the start of the Fargate task until the database creation process is completed?

For reference, here is a snippet of the CDK code with version 2.30.0 of the aws-cdk library:

import * as cdk from 'aws-cdk-lib';
import { Construct } from 'constructs';

import * as ecr from 'aws-cdk-lib/aws-ecr';
import * as ec2 from "aws-cdk-lib/aws-ec2";
import * as ecs from 'aws-cdk-lib/aws-ecs';
import * as ecsp from 'aws-cdk-lib/aws-ecs-patterns';
import * as secretManager from "aws-cdk-lib/aws-secretsmanager";
import { Credentials, DatabaseInstance, DatabaseInstanceEngine, DatabaseSecret, PostgresEngineVersion } from 'aws-cdk-lib/aws-rds';
import { SecurityGroup } from 'aws-cdk-lib/aws-ec2';

// Rest of the CDK code omitted for brevity
typescriptamazon-ecsaws-cdkaws-fargate

Answer №1

To ensure that the database runs before Fargate, one can establish a dependency between the two entities. In my scenario, I implemented a simple trick for achieving this.

Firstly, define the database as a constant:

const database = new DatabaseInstance(this, `${stackPrefix}DatabaseInstance`, {
...

Next, reference the database variable when configuring the Fargate service.

For instance:

webTaskDefinition.addContainer(`${stackPrefix}Container`, {
      image: image,
      portMappings: [{ containerPort: 80 }],
      secrets: {
        ...
        TRICK: database.endpoint // or something similar

      },
      logging: webLogging,
    });

I hope this information proves helpful!

Answer №2

Ensure you include the ECS cluster as a dependency so that the CDK will delay the creation of the ECS cluster until the database and all its nodes have been deployed.

this.escCluster.node.addDependency(dbServerlessCluster);

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