Open the Amazon ECS console, and then configure your service to use the Application Load Balancer that you created. Note: For more information about ephemeral port ranges, see PortMapping. The security group and network access control list (network ACL) must allow traffic from the load balancer to the instances over the ephemeral port range. Important: The host and awsvpc network modes do not support dynamic host port mapping.Īdd a rule to allow inbound traffic from your load balancer to your container instances. Be sure to set the container port mappings for your application. Open the Amazon ECS console, and then set the host port to 0 for the task definition that you're creating or updating. Important: To route health check traffic correctly when you create a target group, expand Advanced health check settings. To set up dynamic port mapping, follow these steps:Ĭreate an Application Load Balancer and a target group. However, an Application Load Balancer uses dynamic port mapping, so you can run multiple tasks from a single service on the same container instance. Instead, with the Classic Load Balancer, you must statically map port numbers on a container instance. ![]() However, it's an AWS security best practice to allow traffic to and from specific CIDR ranges.The Classic Load Balancer doesn't allow you to run multiple copies of a task on the same instance. Note: If you haven't modified these default settings, you don't need to make any changes to the default outbound rule (0.0.0.0/0) for the security group or the default ALLOW ALL rule for the network ACL of the subnet with the instance. In Ingress, verify that there’s a rule to allow traffic to the instance IP/subnet on Ephemeral ports for response traffic. Check that the security group of the instance permits outbound traffic to the load balancer associated with the subnets or default (0.0.0.0/0).įor the network ACL of the subnet, verify that there’s a rule in Egress to allow traffic for the load balancer's subnets on the load balancer's listener port.However, it's an AWS security best practice to allow traffic to and from specific CIDR ranges. In this case, you don't need to modify the network ACLs. If you haven't modified the network ACLs, there's a default rule to allow all (0.0.0.0/0) traffic. If you're using a Network Load Balancer, ensure that the traffic is allowed in the security group of the target instances Note: Modify your security groups or network ACLs, as needed. In egress, be sure that the Ephemeral port range (1024 to 65535) allows return traffic from the load balancer nodes to the instance. ![]() In the security group of the load balancer, allow only inbound traffic on the load balancer's listener port.įor the network ACL of the subnet, allow ingress traffic from the instance IP or subnet/VPC for the load balancer's listener port.
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