AWS CLI Command describe-orderable-db-instance-option for Amazon DocumentDB

Question

I am trying to get the list of instance classes available in my region for Amazon DocumentDB using CLI command:

aws docdb describe-orderable-db-instance-options --engine docdb --query 'OrderableDBInstanceOptions[*].DBInstanceClass'

shared at guide:
https://docs.aws.amazon.com/documentdb/latest/developerguide/db-instance-add.html

Unfortunately I got repeating entries in the output.
Is there a specific reason that I got multiple entries for an instance class?

Following is the outcome for eu-central-1 Frankfurt regions

[
    "db.r5.12xlarge",
    "db.r5.16xlarge",
    "db.r5.24xlarge",
    "db.r5.2xlarge",
    "db.r5.4xlarge",
    "db.r5.8xlarge",
    "db.r5.large",
    "db.r5.xlarge",
    "db.t3.medium",
    "db.r5.12xlarge",
    "db.r5.16xlarge",
    "db.r5.24xlarge",
    "db.r5.2xlarge",
    "db.r5.4xlarge",
    "db.r5.8xlarge",
    "db.r5.large",
    "db.r5.xlarge",
    "db.r6g.12xlarge",
    "db.r6g.16xlarge",
    "db.r6g.2xlarge",
    "db.r6g.4xlarge",
    "db.r6g.8xlarge",
    "db.r6g.large",
    "db.r6g.xlarge",
    "db.t3.medium",
    "db.t4g.medium",
    "db.r5.12xlarge",
    "db.r5.12xlarge",
    "db.r5.16xlarge",
    "db.r5.16xlarge",
    "db.r5.24xlarge",
    "db.r5.24xlarge",
    "db.r5.2xlarge",
    "db.r5.2xlarge",
    "db.r5.4xlarge",
    "db.r5.4xlarge",
    "db.r5.8xlarge",
    "db.r5.8xlarge",
    "db.r5.large",
    "db.r5.large",
    "db.r5.xlarge",
    "db.r5.xlarge",
    "db.r6g.12xlarge",
    "db.r6g.12xlarge",
    "db.r6g.16xlarge",
    "db.r6g.16xlarge",
    "db.r6g.2xlarge",
    "db.r6g.2xlarge",
    "db.r6g.4xlarge",
    "db.r6g.4xlarge",
    "db.r6g.8xlarge",
    "db.r6g.8xlarge",
    "db.r6g.large",
    "db.r6g.large",
    "db.r6g.xlarge",
    "db.r6g.xlarge",
    "db.t3.medium",
    "db.t3.medium",
    "db.t4g.medium",
    "db.t4g.medium"
]

Thanks a lot,

Accepted Answer

Hello,

You can try the below command for the desired result

```
aws docdb describe-orderable-db-instance-options --engine docdb --query 'OrderableDBInstanceOptions[*].DBInstanceClass' | jq -r '.[]' | sort | uniq

```
This can occur for a few reasons for multiple entries:

* The same instance class is available for different instance storage types (standard, provisioned IOPS). Each storage type will be listed separately.
* In some Regions, the same class is available with both VPC and non-VPC network connectivity options. These will appear as duplicates.
* If an instance class has different capabilities or configurations available in the current Region, each variant will be listed separately.

Let me know if you have any other issues

Thanks

Abhinav

AWS CLI Command describe-orderable-db-instance-option for Amazon DocumentDB

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