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[Solved] Network interface is in use by another service in AWS

If you have tried to delete a Security Group, or VPC, or various other resources and you get the dreaded Network interface is in use by another service error, then you can resolve this by deleting the resource through the API.

How to delete the Network Interface (ENI)

aws ec2 delete-network-interface --network-interface-id eni-xxxxx
Code language: Bash (bash)

Replace the eni-xxxxx with the ENI id that you are struggling to delete.

How to find what services are using the ENI

#!/bin/bash vpc="vpc-xxxxxxxxxxxxx" aws ec2 describe-internet-gateways --filters 'Name=attachment.vpc-id,Values='$vpc | grep InternetGatewayId aws ec2 describe-subnets --filters 'Name=vpc-id,Values='$vpc | grep SubnetId aws ec2 describe-route-tables --filters 'Name=vpc-id,Values='$vpc | grep RouteTableId aws ec2 describe-network-acls --filters 'Name=vpc-id,Values='$vpc | grep NetworkAclId aws ec2 describe-vpc-peering-connections --filters 'Name=requester-vpc-info.vpc-id,Values='$vpc | grep VpcPeeringConnectionId aws ec2 describe-vpc-endpoints --filters 'Name=vpc-id,Values='$vpc | grep VpcEndpointId aws ec2 describe-nat-gateways --filter 'Name=vpc-id,Values='$vpc | grep NatGatewayId aws ec2 describe-security-groups --filters 'Name=vpc-id,Values='$vpc | grep GroupId aws ec2 describe-instances --filters 'Name=vpc-id,Values='$vpc | grep InstanceId aws ec2 describe-vpn-connections --filters 'Name=vpc-id,Values='$vpc | grep VpnConnectionId aws ec2 describe-vpn-gateways --filters 'Name=attachment.vpc-id,Values='$vpc | grep VpnGatewayId aws ec2 describe-network-interfaces --filters 'Name=vpc-id,Values='$vpc | grep NetworkInterfaceId
Code language: Bash (bash)

See also  How to create an AWS EKS cluster using eksctl
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