I have a Elastic Beanstalk running in a VPC which has access to a 3rd party VPN. The VPN firewall gives access only a single private IP. but every time during a re-deployment the ebs private IP changes in the EC2 instance. is there a way to set a private static ip to ebs ec2 instance
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My production and development application are running on EBS's EC2 instances where I need to attach an elastic IP to each instance. I am able to associate the elastic IPs to each instance but after some time the IPs disassociated automatically due to application load balance which creates a new instance of EC2, I know it's due to Application Loadbalance but I want to know how can I persist the elastic IPs to each instance? I am using third party integration in which I have to send my static IPs to make them whitelisted.
The AWS solution for sending requests to third parties from a fixed IP (or fixed set of IPs) when running in an auto-scaled environment is to create a NAT Gateway in your public subnet (or one in each public subnet), assign Elastic IPs to the NAT Gateways, and place your EC2 instances in private subnets with a route to the NAT Gateway.
In this configuration, all outbound requests will go through the NAT Gateway(s) which will have static (Elastic) IPs that can be whitelisted by third-parties.
Suppose we have an application running on an EC2 instance in a load-balanced Elastic Beanstalk stack. And this application wants to (1) call web services served by external hosts, and/or (2) open secured TN5250 (i.e, 5250 data stream over SSL-secured Telnet) sessions on external hosts.
Is there a way we can give those external hosts a reliable IP address range from which to expect our traffic?
(Cross-posted to the AWS EC2 developer forum.)
If the Amazon EC2 instances are in a private subnet, then you will need a NAT Gateway in a public subnet to provide them with Internet access. An Elastic IP address is associated with the NAT Gateway, which remains static and can be used for whitelisting. All outbound traffic from the instances will come from the NAT Gateway's IP address.
If the Amazon EC2 instances are in a public subnet and require a static IP address, they will each require their own Elastic IP address. Please note that there are limits on the number of Elastic IP addresses in your account.
My utility deployed on AWS beanstalk and push some data in one of our client's DB server. Client wants public IP of beanstalk instance for whitelisting but problem is beanstalk is on autoscaling mode and spawn instances dynamically.
Is there any way to get rid of this situation?
One way to assign static IP from the pool and associate static IP during launch time from user data, but will not recommend this approach seems easy to go with the existing server, all you need create some elastic IP and update user data in elastic beanstalk instance.
using-features-user-data
But you may be intrested the recommended approach here.
How do I assign a static source IP address for all instances in a load balanced Elastic Beanstalk environment?
Short Description
You can use a network address translation (NAT) gateway to map
multiple IP addresses into a single publicly exposed IP address. When
your Elastic Beanstalk environment uses a NAT gateway, the backend
instances in your environment are launched in private subnets. All
outbound traffic from these instances is routed through the NAT
gateway. All outbound traffic originating from your backend instances
can be uniquely identified by an Elastic IP address, which is a static
IP address required by the NAT gateway.
Resolution
In the following steps, your Amazon Elastic Compute Cloud (Amazon EC2)
instances are launched in a private subnet that uses a NAT gateway,
with an attached Elastic IP address, as a default route. The load
balancer is in a public subnet and all external traffic to and from
the load balancer is routed through an internet gateway.
For the Network card, choose Modify.
For VPC, choose your VPC. In the
Load balancer settings section, for Visibility, choose Public. In the
Load balancer subnets table, choose the public subnets. In the
Instance settings section, clear Public IP address. In the Instance
subnets table, choose only private subnets with the NAT gateway that
you set up earlier.
For more details, you can look into this elastic-beanstalk-static-IP-address
I have two EC2 machines, each with their own security group (SG). One is an EC2 instance with a elastic IP. The other is part of an Elastic Beanstalk. I have my Elastic Beanstalk machine SSH to the EC2 machine using the elastic (static) IP address.
I change SG of the EC2 machine to allow port 22 from the SG of the Elastic Beanstalk. SSH does not connect.
I change the SG of the EC2 machine to allow port 22 from the private VPC range (172.31.0.0). SSH does not connect.
Is this because I'm SSH accessing the EC2 via public IP?
I change the SG of the EC2 machine to allow port 22 of the public IP of the Elastic Beanstalk. SSH connects!
How can I set up a Security group for my EC2 machine that allows SSH access from my Elastic Beanstalk instance, without relying on public IPs? (because they change when using Beanstalk I don't want to keep updating security groups).
I'm answering my own question!
The problem was using the public (elastic) IP of the EC2 instance when making a SSH connection. As based on this StackoverFlow answer, when using the public IP address the security group wanted a public IP address as well.
Changing the access to the public DNS (which contains the elastic/static IP address ec2-XXX-XX-XXX-XXX.compute-1.amazonaws.com so shouldn't change on me) allowed EC2 to resolve internal IP addresses, and thus the Security Group rule worked for another security group!
Is there any difference in using private and public IPs for communicating with other AWS instances? Do private IPs provide any more functionality(or security) as compared to using public IPs?
A few differences:
Instances launched in a VPC, the private IP address remains associated with the network interface when the instance is stopped and restarted. The public IP would get released when you stop and restart unless you use Elastic IP.
If you have a pure backend-service, you could give it only a private IP and create a VPN connection into your VPC. That way, an attacker would not be able to even contact your backend-service unless he gained access to your VPN.
Using the private IP doesn't result in bandwidth charges.
So deploy your EC2 instance in the VPC, so that it gets a static internal IP. If you like, set up an Elastic IP. If you resolve the Elastic IP from the internal network, you will get the private IP and the public IP when resolved from externally. https://alestic.com/2009/06/ec2-elastic-ip-internal/