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when I create s3 bucket with pulumi, pulumi adds a random suffix to the specified bucket name, what could be the reason and how can I avoid that?

It’s for uniqueness. Bucket names have to be globally unique. I remember that you can turn that off. I’m looking how.

<https://pulumi.io/reference/programming-model/#autonaming>

I know that they need to be unique, but in that specific case I prefer to take care of that

&gt; it is typically possible to provide a name: argument to the resource inputs

that's what I tried to do as soon as I saw the random name, but there is an error 'Argument of type '{ name: string; }' is not assignable to parameter of type 'BucketArgs'.
  Object literal may only specify known properties, and 'name' does not exist in type 'BucketArgs'.'

For `aws.s3.Bucket` in particular, you need to pass `bucket: "bucketname"`.

I thought so, but then I've read the description of that parameter:

property bucket
bucket?: pulumi.Input&lt;string&gt;;
The ARN of the S3 bucket where you want Amazon S3 to store replicas of the object identified by the rule.

<https://pulumi.io/reference/pkg/nodejs/pulumi/aws/s3/#BucketArgs-bucket>

but I don't understand the property description

I believe the documentation there is unfortunately incorrect.  This is <https://github.com/pulumi/pulumi-terraform/issues/143>.