I am creating a backend with ECS and I need to have a static IP, for what I understand from the AWS console all internet-facing load balancers are assigned an IP address by AWS, my question is: Will that IP address change? And if I have 2 Availability Zones, both have different IPs?
For internet-facing load balancers, the IPv4 addresses of the nodes are assigned by AWS.
For internal load balancers, the IPv4 addresses are assigned from the subnet CIDR.
Yes, the IPs change sporadically and you're correct that the IP is different in each Availability Zone.
If you need to have static IPs, you could consider fronting an Application Load Balancer with a Network Load Balancer. This would allow an elastic IP to be set for each AZ that the NLB resides and you should still get the benefits of the ALB.
The downsides would be extra cost and latency. I haven't tried this myself so can't vouch for how well it works.
Source: https://aws.amazon.com/blogs/networking-and-content-delivery/application-load-balancer-type-target-group-for-network-load-balancer/
Will that IP address change? And if I have 2 Availability Zones, both have different IPs?
Yes, for application load balancer (ALB), the IPs are not static. If you want static IP for ALB you can add AWS Global Accelerator to it.
Alternatively, use network LB (NLB), which has static IP addresses.
When creating a Network Load Balancer, there is the option to allocate an Elastic IP address per AZ from one of the EIPs available to you. If you don't allocate an EIP, AWS assigns a Static IP per AZ that can be used by applications as the front-end IP of the load balancer. Note that this only applies to the NLB.
Source: https://aws.amazon.com/elasticloadbalancing/network-load-balancer/
Related
Is there any limit for the number of vpc to be attached to an elastic load balancer in aws. I have created an ELB with one VPC , I wanted to know , whether I can have multiple vpc on the same load balancer?
When setting up an Elastic Load Balancer (ELB) you must specify exactly one VPC. In this VPC you can select one subnet per Availability Zone (AZ).
These settings are needed to assign an IP address to the ELB. When you configure one one subnet then the ELB hat only one IP in this subnet. It is recommended to assign at least two subnets (in different AZs) to the ELB. This way any outage in one AZ does not affect the ELB.
Remember that this configuration is only for input data. Therefore, we handle the question how to connect to the ELB. Configuring output, e.g. where to forward the data by ELB, is another topic.
So I have just setup an application load balancer but I need a static IP to whitelist my database connection, I found Global Accelerator can do the job so I have set it up and assigned it to the ALB. All showing fine in the console but when I ping my domain (www.example.com), I don't see either of the 2 static IP's assigned... and when I whitelist both IP's my application still cannot connect.
Am I doing something wrong?
Edit: My database is Mongo DB hosted on the Atlas Cloud. In my staging environment I have secured the connection to a single server instance using that servers IP address. Now I'm moving to a production environment with a load balancer, I'm not quite sure how I would achieve the same result, since I have multiple EC2 instances which can be created/destroyed via autoscaling. My thinking is that I need to whitelist the load balancer IP address rather than individual instances.
I am assuming that your architecture is:
Domain name pointing to an Application Load Balancer in AWS
Load Balancer points to an Auto Scaling group of Amazon EC2 instances
The EC2 instances point to your MongoDB database hosted on the Atlas Cloud
You want an static IP address so that the database can permit access from the Amazon EC2 instances
While incoming traffic to the EC2 instances goes through the Load Balancer, please note that the connection from an EC2 instance to the database is a separate outbound connection that is established to the database. This traffic does not go through the Load Balancer. The only traffic coming 'out' of a Load Balancer is the response to requests that came 'in'.
The typical way to implement this architecture is:
Load Balancer in public subnets
Auto-Scaled Amazon EC2 instances in private subnets
A NAT Gateway in the public subnet(s)
This way, the instances in the private subnets can access the Internet via the NAT Gateway, yet they are fully isolated from traffic coming in from the Internet. It has the additional benefit that the NAT Gateway has a static IP address. All traffic going through the NAT Gateway to the Internet will 'appear' to be coming from this IP address.
For fault tolerance, it is recommended to put a NAT Gateway in at least two Availability Zones. Each will have its own static IP address.
Oh, and you could consider moving your database to Amazon DocumentDB (with MongoDB Compatibility), which would reduce latency between the application servers and the database.
I created an internal network load balancer (NLB) to connect to EC2 instances on a private subnet. I want to restrict access to the EC2 instances only from the network load balancer. I used these instructions https://docs.aws.amazon.com/elasticloadbalancing/latest/network/target-group-register-targets.html#target-security-groups but it did not work.
Basically, I added the IP address of the network interface of the NLB to the security group with my specific port (eg: 8080 10.4.2.9/32) allowed but that did not work. When i switched to all allow (eg: 8080 0.0.0.0/32) it worked, but i do not want other instances to have access to the ec2 instance.
Any ideas on why this is not working?
Thanks
For what you are trying to accomplish, NLB is the wrong load balancer.
NLB is a layer 4 load balancer. This means that the IP address that you see (at the EC2 instance) is the IP address of the client and not the IP address of the load balancer. With NLB you must allow the client's IP address in your security group.
You want a layer 7 load balancer to implement what you want to do (block other systems in your VPC from accessing your EC2 instances directly). This means ALB or the classic ELB.
If you're using a Network Load Balancer, update the security groups
for your target instances, because Network Load Balancers do not
have associated security groups.
If your target type is an IP, add a rule to your security group to
allow traffic from your load balancer to the target IP.
If your target type is an instance, add a rule to your security group to
allow traffic from your load balancer and clients to the target IP.
You can allow traffic in the EC2 instance security group. As your
instance is in private subnet for that you need to lunch load
balancer in the same region but in public subnet.
Know about your use case first.
Best use cases for Network Load Balancer:
When you need to seamlessly support spiky or high-volume inbound TCP
requests.
When you need to support a static or elastic IP address.
If you are using container services and/or want to support more than one
port on an EC2 instance. NLB is especially well suited to ECS (The
Amazon EC2 Container Service).
security-group-load-balancer
new-network-load-balancer-effortless-scaling-to-millions-of-requests-per-second
what-is-a-network-load-balancer
I have a load balancer created in my VPC with two subnets. Now I want to open a firewall rule from within my company intranet. I have no control over this firewall. But to open a rule on the firewall - the firewall team is accepting only ip addresses and not the DNS names.
But since the IP address of the load balancer keeps changing I can't give it to the firewall team. That's where I am stuck.
How can I open a firewall rule to an AWS load balancer from within my intranet?
You are correct that an Application Load Balancer does not provide static IP addresses.
You might be able to change to a Network Load Balancer:
Elastic Load Balancing creates a network interface for each Availability Zone you enable. Each load balancer node in the Availability Zone uses this network interface to get a static IP address. When you create an Internet-facing load balancer, you can optionally associate one Elastic IP address per subnet.
It is also possible to put a Network Load Balancer in front of an Application Load Balancer to gain the benefits of both.
See: Using static IP addresses for Application Load Balancers | AWS Networking & Content Delivery Blog
I have a load balancer configured to have an IPV4 Ip address. However, the provided IP is a DNS mapped IP address to the load balancer of the format *.ap-south-1.elb.amazonaws.com.
I need to configure IOT devices to send data to the load balancer and they do not support DNS. How can I assign a static IP address like ... to my load balancer so that I can configure my IOT devices to send data to it.
The Elastic IPs section does not provide a facility to allocate it to a load balancer and only supports ec2 instances.
Conclusion:
I have found a way to use DNS on my IOT device and working on this was vital. I am now aware of the option of manually hosting a load-balancer on an EC2 instance. A simper alternative is forwarding all requests at an elastic IP addressed EC2 instance to the load balancer. However, this will cause a bottleneck at the transparent proxy. Hence, I think using the DNS feature on the IOT device is the best option.
Elastic Load Balancers do not support static IP addresses. They only support DNS CNAMEs (or Aliases if you are using Route 53). This is because ELB DNS entries will resolve to different IP addresses depending on how it is scaling between availability zones. Also, over time, the IP addresses will/may change.
The AWS documentation also specifically states to create CNAME-records only when mapping custom DNS entries to your ELB. If you are using Route 53, you can create an Alias record, which look like an A-record to the outside world.
If you need a static IP address, then you cannot use ELB.
Instead, you will need to manage your own load balancer (HAProxy, nginx, etc.) on an EC2 instance using an Elastic IP address.
It would not be possible to assign a static IP with the elastic load balancer. You need to use DNS name only.
The only way I am aware of doing this is by setting up your instances within a VPC and having dedicated NAT instances by which all outbound traffic is routed.
Here is a link to the AWS documentation on how to set up NAT instances:
http://docs.amazonwebservices.com/AmazonVPC/latest/UserGuide/VPC_NAT_Instance.html
AWS Elastic Load Balancer does not support assigning a static IP address due to many reasons.
Looking at your problem, the issue you are facing is having large amount of data sources to pump data to AWS. I suggest you to use AWS Kinesis Firehose service instead of the current approach as Firehose specifically focus on streaming data into AWS.