How to Connect AWS ECS (ApplicationLoadBalancedFargateService) Private IP to RDS Security Group Using CDK

Question

How to Connect ECS Private IP to RDS Security Group Using CDK?

I need a private ip of ApplicationLoadBalancedFargateService (CDK Code).

I tried the following (Failed to resolve) :

    const auroraSecurityGroup = new ec2.SecurityGroup(this, 'security-group', {
      vpc,
      allowAllOutbound: true,
      description: 'Security Group of Aurora PostgreSQL',
      securityGroupName: AURORA_SECURITY_GROUP_NAME
    });

    auroraSecurityGroup.addIngressRule(ec2.Peer.ipv4('my ecs private ip'), ec2.Port.tcp(DB_PORT), 'describe');

Answer 1

If you would like to allow specific ip address, you have to specify with cidr.

ec2.Peer.ipv4('1.2.3.4/32')

Allow the security group of the fargate service as a source to arurora seucirty group:

auroraSecurityGroup.connections.allowFrom(ecsService.service, Port.tcp(3306), 'Inbound');