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# generals
sparse-intern-71089
11/04/2021, 8:49 AMThis message was deleted.
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brave-planet-10645
11/04/2021, 9:07 AMYou'll probably need to create the ENI separately and attach it to the instance https://www.pulumi.com/registry/packages/aws/api-docs/ec2/networkinterface/
brave-planet-10645
11/04/2021, 9:08 AMOtherwise it'll be the EC2 instance that controls the lifecycle of the ENI
r
red-football-97286
11/04/2021, 9:12 AMI've done this within a component resource. Create the eni and attach it to the EC2 instance.
red-football-97286
11/04/2021, 9:12 AMBut still removes it.
red-football-97286
11/04/2021, 9:13 AMIt needs to be the primary as well.
red-football-97286
11/04/2021, 9:19 AMThe component resource......
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brave-planet-10645
11/04/2021, 9:21 AMThe destroy command tells AWS to remove everything as well, so if you're running destroy AWS is going to remove the ENI. My advise is to work out a way to be able to terminate the instance. This is good general "cloud" advise anyway where an EC2 instance might have to move hosts at any time and therefore it might be deleted
brave-planet-10645
11/04/2021, 9:23 AMCan you set the
deviceIndex0brave-planet-10645
11/04/2021, 9:23 AMWill that make it the primary?
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red-football-97286
11/04/2021, 9:23 AMI have, can you see the code I uploaded?
red-football-97286
11/04/2021, 9:24 AMYes it will, it works fine when building...just the remove part!
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brave-planet-10645
11/04/2021, 9:46 AMWhat's your use case here? Why do you need to keep the network interface around?
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red-football-97286
11/04/2021, 9:47 AMIt is todo with licensing an application. It requires the mac address to be licensed. If we can keep the eni then it can be reattached to a new instance in the event of a problem.
red-football-97286
11/04/2021, 9:48 AMWould making the EC2 instance a child to the ENI make a difference?
red-football-97286
11/04/2021, 9:49 AM Copy code
// Whether or not to delete the network interface on instance termination. Defaults to `false`. Currently, the only valid value is `false`, as this is only supported when creating new network interfaces when launching an instance.red-football-97286
11/04/2021, 9:49 AMThis is the problem, only works on creation.
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brave-planet-10645
11/04/2021, 9:54 AMIf you're running destroy, Pulumi doesn't just terminate what's there, it deletes.
If this is something you need to stick around, you'll need it in a new project/stack, one that doesn't get destroyed
r
red-football-97286
11/04/2021, 9:56 AMOK, thanks Piers.
red-football-97286
11/04/2021, 9:58 AMWon't it affect the EC2 from being deleted?
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brave-planet-10645
11/04/2021, 10:05 AMNot sure I understand. Do you mean if you have the interface resource in a different stack but attach it to an EC2 interface and try to run destroy it'll fail?
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red-football-97286
11/04/2021, 10:10 AMYes...
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brave-planet-10645
11/04/2021, 10:23 AMI don't know, but since you can create a network interface resource without an ec2 instance I suspect that it'll be possible
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billowy-army-68599
11/04/2021, 2:06 PM
just following up here, you're defining the ENI in code too?
r
red-football-97286
11/04/2021, 2:08 PMI was, not now.
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