New to fargate. Trying to understand how to separate tasks connections.
We have multiple Fargate tasks, like Frontend task, Backend task, and other tasks created by different teams.
How to restrict incoming and outgoing traffic to other services so that other team's tasks cannot communicate with frontend or backend.
In order to restrict or allow traffic, we can use Security Groups
In fact, when we create a Fargate task from the AWS console, we are greeted with the following options:
This step will explicitly create either one security group allowing inbound traffic on port 80 for HTTP or two security groups in case if we put a load balancer in front of the task. In case if we have a load balancer, the security group attached to the load balancer will allow traffic from the outside on port 80, while the security group attached to the task will allow traffic only from the load balancer.
Obviously the inbound/outbound rules of a security group can be further customized if we go into EC2 console and search for our security group.
Besides security groups, we can allow or restrict traffic on the VPC level using NACLs.
Related
A retail website is deployed on a ECS cluster - in a private subnet - behind ELB Application Load Balancer(ALB). What is the best method to ensure that the requests to ECS cluster are coming from ALB only?
A. Configure the inbound rule of ECS security group to accept requests only from ALB security Group.
B. Configure the inbound rule of ECS security group to deny requests from resources other than ALB.
C. Configure the inbound rule of ECS security group to accept requests only from the IP address of the ALB.
D. Create network ACL rules for the private subnet to accept requests only from the IP address of the ALB.
My question is: What's the different between A and C? Why A is right from the Answer? Thanks!
The configuration would be:
A Security Group on the Load Balancer (LB-SG) that allows inbound traffic (eg on port 80/443)
A Security Group on the ECS cluster (ECS-SG) that permits inbound access from LB-SG
By referring to LB-SG, any resource supporting the Load Balancer will be permitted to send traffic to the ECS cluster. There is no need to update configurations when the Load Balancer adds/removes additional AZs or expands to handle additional traffic.
Thus, A would be the most correct answer.
I have a couple of HTTP services running in containers using AWS Fargate. These services are meant to be accessed using an Application Load Balancer, and from a list of selected IP addresses. However, with default settings, the services are open to all inbound traffic.
The containers are all in the same VPC, Security Group and Subnets. The same goes for the load balancer.
I tried restricting the inbound traffic using Network ACLs, but this also blocked connections from the load balancer. What is the correct way of achieving the desired behavior (blocking external traffic)?
Both ECS tasks and service supports security groups. So you update the "Inbound traffic" of the security group to allow traffic only from ALB, read more about it here: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/create-application-load-balancer.html
I think for your case it is better to use AWS WAF, If you want to allow some web requests and block others based on the IP addresses that the requests originate from, create an IP match condition for the IP addresses that you want to allow and another IP match condition for the IP addresses that you want to block. see the following link: here
Hi I am new to AWS and trying to understanding the difference between a load balance, target, target group and security group . I have 2 instances running. Now i want to balance the load coming to these servers. Will load balance be created on a new instance ? what are listeners and how are they different from load balancers?
Yes, the load balancer is an EC2 instance to provide the networking and compute services needed for load balancing. This also means that there is a per hour charge for the load balancer EC2 instance.
A Target Group is used to route requests to one or more registered targets (your backed EC2 instances).
A listener is a process that "TCP Listens" for requests from clients. Common listeners are for receiving requests on port 80 (HTTP) and port 443 (HTTPS). The listeners then forward requests to your Target Group.
A Security Group is a firewall that allows or denies network traffic. A security group sits in front (our around) your load balancer protecting it from traffic that you do not allow (want).
There is a lot of information on the Internet. Here is a link to help you get started.
What Is an Application Load Balancer?
I have a Fargate Service running in AWS. I use it to run multiple tasks. Some of the tasks connect to an RDS database to query the database.
How can I add the Fargate Service to my inboard rules of a Security Group for the RDS database? - Is there a way to associate an Elastic IP with the Fargate Cluster?
Might have misunderstood something here... But the ECS allows you specify a security group at the service level.
Go to https://docs.aws.amazon.com/cli/latest/reference/ecs/create-service.html
And search for the --network-configuration parameter
So surely you just need to set the source on your inbound rule of the RDS security group to be that security group ID?
Fargate doesn't support associating Elastic IPs with clusters. Clusters which runs in Fargate mode operate on instances which are not yours, it's the opposite of classic ECS stacks. That means you can't manage networking of host instances.
There is a way to associate IP with stack by having a Network Load Balancer in front of cluster. Then you could add a rule which allows connect your cluster through NLB.
I am trying to deploy Spring Boot Application with AWS Elastic Beanstalk. Instead of using default settings for the environment, I modified something under "VPC". After picking availability zone and one of the security groups for the VPC, I created the environment.
However when I looked at the instance detail after it is created, I noticed it is tied to two security groups. Other than the one I chose sg-98c031f3, it has another newly-generated security group sg-72b94919.
Why does it create two security groups for the environment when I selected only one group? Is there a way to remove one of them since one security group is enough to handle all the rules.
Elastic Beanstalk will always create and utilize one security group that gets attached to the EC2 instance. This group is managed by Elastic Beanstalk and it's primary purpose is to allow inbound connections from your load balancer.
(It also has a secondary purpose of allowing inbound SSH connections if you have selected a keypair for your EC2 instances)
Elastic Beanstalk allows you to select 0 or more additional security groups to attach to your EC2 instances. Note that you do not need to select any security groups if you don't want to. This is so that you can add additional inbound/outbound rules for your EC2 instances without needing to modify the EB-managed one.
Some reasons why you might want to add additional security groups:
To allow more inbound ports (for example, RDP)
To allow outbound network connections (for example, NTP)
To act as sources and targets for other security group rules (for example, allow connections from your selected security group into your RDS instances)