python AWS：从EC2实例元数据中获取临时凭证，并使用它来访问AWS资源

Posted 2021-05-09

import boto3
from botocore.utils import InstanceMetadataFetcher
from botocore.credentials import InstanceMetadataProvider
provider = InstanceMetadataProvider(iam_role_fetcher=InstanceMetadataFetcher(timeout=1000, num_attempts=2))
creds = provider.load()

session = boto3.Session(aws_access_key_id=creds.access_key, aws_secret_access_key=creds.secret_key, aws_session_token=creds.token)
ddb = session.client('dynamodb')

response = ddb.get_item(
    TableName='swarm-dynamo-table',
    Key={
        'node_type': {
            'S': 'primary_manager'
        }
    }
)

print(response['Item']['ip']['S'])