CfnEIPAssociation : Creates the association but returns an error

[ETisREAL]

Describe the bug

I am trying to associate an EIP. This is the code:

new ec2.CfnEIPAssociation(this, `${props.STAGE}-QlashMainEIPAssociation`, {
            instanceId: qlashMain.instanceId,
            allocationId: new ec2.CfnEIP(this, `${props.STAGE}QlashMainEIP`, { instanceId: qlashMain.instanceId }).attrAllocationId
})

Expected Behavior

It should create the EIP, as I've already done before

Current Behavior

It throws this error:

12:14:19 PM | CREATE_FAILED        | AWS::EC2::EIPAssociation  | PRODQlashMainEIPAssociation
Resource handler returned message: "Resource of type 'AWS::EC2::EIPAssociation'
with identifier 'eipalloc-0daccfae170430c23' already exists." (RequestToken: fc
f075af-d0ca-f393-de91-400c74443908, HandlerErrorCode: AlreadyExists)

It is almost as if it is creating the EIP twice.

Reproduction Steps

Run the code snipped associated to any ec2 instance

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.87

Framework Version

No response

Node.js Version

v18.04

OS

Linux - Ubuntu

Language

Typescript

Language Version

No response

Other information

No response

[ETisREAL]

I figured it out myself. It is not clear in the docs, could I update it?

Anyways, if you encounter the same error, the solution is this:

Don't create EIP and EIPAssociations as you used to. ex.

 new ec2.CfnEIPAssociation(this, 'qlashMainEIPAssociation', {
            eip: new ec2.CfnEIP(this, 'qlashMainEIP', { instanceId: qlashMain.instanceId }).attrPublicIp,
            instanceId: qlashMain.instanceId
})

Don't specify the instanceId in the creation of the EIPAssociation, do it in the following manner:

new ec2.CfnEIPAssociation(this, `${props.STAGE}-QlashMainEIPAssociation`, {
            instanceId: qlashMain.instanceId,
            allocationId: new ec2.CfnEIP(this, `${props.STAGE}QlashMainEIP`, { tags: [{key: 'Name', value: `${props.STAGE}QlashMainEIP`}] }).attrAllocationId
})

just create a new CfnEIP and specify the instanceId separately.

Have a good one everybody

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