https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-getting-started-set-up-credentials.html
```console
$ aws configure
AWS Access Key ID [None]: dummy
AWS Secret Access Key [None]: dummy
Default region name [None]: ap-northeast-1
Default output format [None]:
```
作成されたファイル。
```console
$ cat ~/.aws/config
[default]
region = ap-northeast-1
$ cat ~/.aws/credentials
[default]
aws_access_key_id = dummy
aws_secret_access_key = dummy
```