ENI A connected to a public-facing subnet ENI B connected to an internal private subnet You could, for example, attach an ENI to a running EC2 instance, or you could have it live after the EC2 instance is deleted. As a form of "cheap" high availability: Attach a ENI to an EC2 instance; if the instance dies launch another one and attach the ENI ...

Aug 7, 2018 · As far as high availability goes, what is the difference between using an Elastic IP or an Elastic Network Interface to mask instance failure? Is the only difference because ENIs can be used for p...

Jul 16, 2018 · Can we change Primary Elastic Network Interface from Ec2 Instance to another Ec2? I'm able to swap the secondary ENI's between the Ec2 Instances, but not able to change the primary ENI from one Ec2 instance to the other. Is it possible to change the primary ENI?

Dec 18, 2015 · No, EIP (Elastic IP address) can be assigned to any ENI on that instance, and it can be released and assigned to another ec2 instance or ENI as well. For Elastic Network Interfaces (ENI), the best explanation is from AWS: An elastic network interface (ENI) is a virtual network interface that you can attach to an instance in a VPC.

(In my observations using AWS CloudTrail, the delay between Lambda execution and ENI deletion was around one hour.) Until AWS addresses this issue further, you can workaround the issue by detaching and deleting the leftover ENIs in between deleting the Lambda function and deleting the associated Security Group (s) and Subnet (s).

I had an ENI deployed by a Lambda function after deleting the lambda function, the ENI got stuck. After some time I was able to detach the ENI. Update: for the people using the aws cli, AWS support posted a bash script and documentation to easily identify ENIs that are still hanging around somewhere (source).

Apr 12, 2023 · ENI can be attached to resources other than EC2. e.g., Lambda function, NAT GW, Load Balancer, etc. Unfortunately, there is no one-size-fits-all CLI command that will solve this. I will list some examples for a selection of resources: Lambda aws lambda list-functions --region ap-northeast-2 NAT GW aws ec2 describe-nat-gateways --region ap ...

May 10, 2020 · Here I have an AWS instance that has been specified with two security group default ① and my first group ②. Now I would like to make this instance ssh available. Both the following ways work: specify this instance with a new security group ssh-available Or, find the Elastic Network interface (ENI) of this instance, then specify the ENI with security group ssh …

Nov 2, 2022 · The CNI plugin uses Elastic Network Interface (ENI) for Pod networking. The CNI allocates ENIs to each worker node and uses the secondary IP range from each ENI for pods. The CNI pre-allocates ENIs and IP addresses for faster pod startup." I want to know the ENI id attached to my pod and using AWS CNI plugin for networking.

Jul 1, 2016 · An ENI (Elastic Network Interface) is never detached when an instance is Stopped. Every Amazon EC2 instance has a primary ENI on eth0. This ENI cannot be detached from the instance. It is also possible to create secondary ENIs and attach them to instances. These stay attached during a Stop and Start, but you can choose to detach it and then attach it to another …