EFS: support setting the AZ when setting up a oneZone FileSystem

[kabo]

Describe the feature

We'd like to be able to specify which AZ the one-zone FS should be in

Use Case

So it's in the same AZ as the rest of our setup. This is for a test environment so one AZ is fine and cheaper.

Proposed Solution

There's a vpcSubnets constructor prop, it'd be handy if it could work like this

    const efs = new FileSystem(this, 'Efs', {
      vpc,
      encrypted: true,
      oneZone: true,
      vpcSubnets: { availabilityZones: [ 'eu-west-1b' ] },
    })

But maybe some other solution is easier.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.136.0

Environment details (OS name and version, etc.)

Artix Linux

[pahud]

Sounds good to me.

At this moment it's determined automatically by selecting the first VPC AZ this way, which is not configurable.

aws-cdk/packages/aws-cdk-lib/aws-efs/lib/efs-file-system.ts

Line 770 in af7dcff

const oneZoneAzName = props.vpc.availabilityZones[0];

Having the support to allow users to configure would be great.

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