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How to set up dynamic port mapping for ECS: Amazon ECS

by | Aug 18, 2021

Are you looking for how to set up dynamic port mapping for ECS? We can help you with this!

Here, at Bobcares, we often receive similar requests from our AWS customers as a part of our AWS Support Services.

Today, let’s see the steps followed by our Support Techs to help our customers to set up dynamic port mapping for ECS.

 

Set up dynamic port mapping for ECS

 
Port mappings allow the containers to access ports on the host container instance to send or receive traffic. The Application Load Balancer supports Dynamic Port Mapping with ECS. It allows the running of multiple tasks of a service on a single server.

Now, let’s discuss the steps to set up the dynamic port mapping.

  1. At first, we need to create an Application Load Balancer and a target group. We need to define the port that Application Load Balancer uses to route traffic to our targets and perform health checks on the targets.

2. Then Log in to the AWS MAnagement console and open the Amazon ECS console.

3. Set the host port to 0 for the task definition that we are creating. Also, make sure to set the container port mappings for the application.

4. Then add a rule to allow inbound traffic from the load balancer to container instances. The security group and network ACL must allow traffic from the load balancer to the instances.

5. Now, open the Amazon ECS console, and then we need to configure the service to use the Application Load Balancer that we created.

6. Then from the Amazon ECS console, select Target Groups and then select our target group.

7. We can see which port is used for the task in the service that we created from the Target tab.

8. If the dynamic port mapping is configured properly, then we can see the registered targets in the target group and the port for the task. We also see the task in the registered targets for the following ephemeral port ranges: 49153–65535 and 32768–61000.

Note: We can add a load balancer only while creating a service. We can’t modify the target group’s ARN, container name, or the container port after the service creation. We can’t modify the load balancer configuration of an existing service.

 

[Need help with more AWS queries? We’d be happy to assist]
 

Conclusion

 
To conclude, today we discussed the steps followed by our Support Engineers to help our customers to set up dynamic port mapping for ECS.

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