Schedule the configuration of RCUs for a serverless instance

Set up

1. Install Python and install the Alibaba Cloud SDK dependencies.

2. Install APScheduler:

   pip install apscheduler

3. Download the SDK sample project for ModifyDBInstanceSpec:

   1. Open the ModifyDBInstanceSpec page in OpenAPI Explorer.

   2. On the Parameters tab, set the following values:

      Parameter	Value
      DBInstanceId	rm-bp1t8v93k6e15****
      PayType	Serverless
      Direction	Serverless
      MaxCapacity	8.0
      MinCapacity	0.5
      AutoPause	false
      SwitchForce	true

   3. On the SDK Sample Code tab, select Python from the Languages dropdown and click Download Project. > Note: Download the SDK V2.0 sample project.

   4. Decompress the package and open the _alibabacloud_sample_ directory.

Configure the scheduled task

Add the content of the APScheduler scheduled task to the sample.py file and use a cron trigger to configure the execution time. The cron trigger hour=7, minute=50 fires at 07:50 every day; hour=9, minute=0 fires at 09:00.

# -*- coding: utf-8 -*-
# This file is auto-generated, don't edit it. Thanks.
import os
import sys
from typing import List, Dict
from alibabacloud_rds20140815.client import Client as Rds20140815Client
from alibabacloud_tea_openapi import models as open_api_models
from alibabacloud_rds20140815 import models as rds_20140815_models
from alibabacloud_tea_util import models as util_models
from alibabacloud_tea_console.client import Client as ConsoleClient
from alibabacloud_tea_util.client import Client as UtilClient
from apscheduler.schedulers.blocking import BlockingScheduler

class Sample:
    def __init__(self):
        pass

    @staticmethod
    def create_client() -> Rds20140815Client:
        """
        Use your AccessKey ID and AccessKey secret to initialize a client.
        @return: Client
        @throws Exception
        """
        # If the project code is leaked, the AccessKey pair may be leaked and the security of resources within your account may be compromised. The following sample code is provided only for reference.
        # For security purposes, use temporary access credentials provided by Security Token Service (STS). For more information, see https://www.alibabacloud.com/help/en/sdk/developer-reference/v2-manage-php-access-credentials.
        config = open_api_models.Config(
            # Required. Make sure that the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable is configured.
            access_key_id=os.environ['ALIBABA_CLOUD_ACCESS_KEY_ID'],
            # Required. Make sure that the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable is configured.
            access_key_secret=os.environ['ALIBABA_CLOUD_ACCESS_KEY_SECRET']
        )
        # For more information about endpoints, visit https://api.aliyun.com/product/Rds.
        config.endpoint = f'rds.aliyuncs.com'
        return Rds20140815Client(config)

    # Call the ModifyDBInstanceSpec API to update the serverless RDS instance configuration.
    @staticmethod
    def modify_db_instance_spec(config: Dict[str, float]) -> None:
        """
        Modify DB instance spec - the core task function
        """
        client = Sample.create_client()
        serverless_configuration = rds_20140815_models.ModifyDBInstanceSpecRequestServerlessConfiguration(
            max_capacity=config['max_capacity'],
            min_capacity=config['min_capacity'],
            auto_pause=config['auto_pause'],
            switch_force=config['switch_force']
        )
        modify_dbinstance_spec_request = rds_20140815_models.ModifyDBInstanceSpecRequest(
            dbinstance_id='rm-bp1t8v93k6e15****',
            direction='Serverless',
            pay_type='Serverless',
            serverless_configuration=serverless_configuration
        )
        runtime = util_models.RuntimeOptions(
            read_timeout=50000,
            connect_timeout=50000
        )
        try:
            resp = client.modify_dbinstance_spec_with_options(modify_dbinstance_spec_request, runtime)
            ConsoleClient.log(UtilClient.to_jsonstring(resp))
        except Exception as error:
            # Handle exceptions with caution in your actual business scenario. Do not ignore exceptions in your project. In this example, error messages are printed to the screen.
            print(error.message)
            print(error.data.get("Recommend"))
            UtilClient.assert_as_string(error.message)

    @staticmethod
    def main(args: List[str]) -> None:
        # Initialize the scheduler.
        scheduler = BlockingScheduler()

        # RCU range for 08:00-09:00 peak: min=4, max=8.
        # Scheduled at 07:50 to allow inter-host scale-up to complete before peak starts.
        config_8am = {
            'max_capacity': 8,
            'min_capacity': 4,
            'auto_pause': False,
            'switch_force': True
        }

        # Default RCU range restored after peak: min=0.5, max=8.
        config_9am = {
            'max_capacity': 8,
            'min_capacity': 0.5,
            'auto_pause': False,
            'switch_force': True
        }

        # Create scheduled tasks using cron triggers.
        scheduler.add_job(Sample.modify_db_instance_spec, 'cron', hour=7, minute=50, args=[config_8am])
        scheduler.add_job(Sample.modify_db_instance_spec, 'cron', hour=9, minute=0, args=[config_9am])

        try:
            scheduler.start()
        except (KeyboardInterrupt, SystemExit):
            pass

if __name__ == '__main__':
    Sample.main(sys.argv[1:])

Replace rm-bp1t8v93k6e15**** with your actual instance ID. The hour and minute values in scheduler.add_job follow 24-hour time; adjust them to match your peak window.