弹性管理 ECS 实例
获取 RAM 子账号 AK 密钥
使用API管理ECS实例，您需要能访问ECS资源的API密钥（AccessKey ID 和 AccessKey Secret）。为了保证云服务的安全，您需要创建一个能访问ECS资源的RAM用户，获取该用户的AccessKey密钥，并使用这个RAM用户和API管理ECS实例。
以下是获取RAM用户AccessKey密钥的操作步骤：
创建RAM用户并获取AccessKey密钥。
直接给RAM用户授权，授予RAM用户 管理云服务器服务(ECS)的权限。
安装 ECS Python SDK
首先确保您已经具备Python的Runtime，本文中使用的Python版本为2.7+。
pip install aliyun-python-sdk-ecs
如果提示您没有权限，请切换sudo继续执行。
sudo pip install aliyun-python-sdk-ecs
本文使用的SDK版本为 2.1.2。
Hello Alibaba Cloud
创建文件 hello_ecs_api.py。为了使用SDK，首先实例化AcsClient对象，这里需要RAM用户的AccessKey ID和AccessKey Secret。
AccessKey ID和AccessKey Secret是RAM用户访问阿里云ECS服务API的密钥，具有该账户完全的权限，请妥善保管。
from aliyunsdkcore import clientfrom aliyunsdkecs.request.v20140526.DescribeInstancesRequest import DescribeInstancesRequestfrom aliyunsdkecs.request.v20140526.DescribeRegionsRequest import DescribeRegionsRequestclt = client.AcsClient('Your Access Key Id', 'Your Access Key Secrect', 'cn-beijing') 完成实例化后可以进行第一个应用的开发。查询当前账号支持的地域列表。具体的文档参见 查询可用地域列表。
def hello_aliyun_regions(): request = DescribeRegionsRequest() response = _send_request(request) region_list = response.get('Regions').get('Region') assert response is not None assert region_list is not None result = map(_print_region_id, region_list) logging.info("region list: %s", result)def _print_region_id(item): region_id = item.get("RegionId") return region_iddef _send_request(request): request.set_accept_format('json') try: response_str = clt.do_action(request) logging.info(response_str) response_detail = json.loads(response_str) return response_detail except Exception as e: logging.error(e)hello_aliyun_regions() 在命令行运行 python hello_ecs_api.py 会得到当前支持的 Region列表。类似的输出如下：
[u'cn-shenzhen', u'ap-southeast-1', u'cn-qingdao', u'cn-beijing', u'cn-shanghai', u'us-east-1', u'cn-hongkong', u'me-east-1', u'ap-southeast-2', u'cn-hangzhou', u'eu-central-1', u'ap-northeast-1', u'us-west-1']
查询当前的 Region 下的 ECS 实例列表
查询实例列表和查询 Region 列表非常类似，替换入参对象为DescribeInstancesRequest 即可，更多的查询参数参考 查询实例列表。
def list_instances(): request = DescribeInstancesRequest() response = _send_request(request) if response is not None: instance_list = response.get('Instances').get('Instance') result = map(_print_instance_id, instance_list) logging.info("current region include instance %s", result)def _print_instance_id(item): instance_id = item.get('InstanceId'); return instance_id 输出结果为如下：
current region include instance [u'i-****', u'i-****'']
更多的API参考 ECS API 概览，您可以尝试作一个 查询磁盘列表，将实例的参数替换为 DescribeDisksRequest。
完整代码示例
以上操作完整的代码示例如下所示。
# coding=utf-8# if the python sdk is not install using 'sudo pip install aliyun-python-sdk-ecs'# if the python sdk is install using 'sudo pip install --upgrade aliyun-python-sdk-ecs'# make sure the sdk version is 2.1.2, you can use command 'pip show aliyun-python-sdk-ecs' to checkimport jsonimport loggingfrom aliyunsdkcore import clientfrom aliyunsdkecs.request.v20140526.DescribeInstancesRequest import DescribeInstancesRequestfrom aliyunsdkecs.request.v20140526.DescribeRegionsRequest import DescribeRegionsRequest# configuration the log output formatter, if you want to save the output to file,# append ",filename='ecs_invoke.log'" after datefmt.logging.basicConfig(level=logging.INFO, format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s', datefmt='%a, %d %b %Y %H:%M:%S')clt = client.AcsClient('Your Access Key Id', 'Your Access Key Secrect', 'cn-beijing')# sample api to list aliyun open api.def hello_aliyun_regions(): request = DescribeRegionsRequest() response = _send_request(request) if response is not None: region_list = response.get('Regions').get('Region') assert response is not None assert region_list is not None result = map(_print_region_id, region_list) logging.info("region list: %s", result)# output the instance owned in current region.def list_instances(): request = DescribeInstancesRequest() response = _send_request(request) if response is not None: instance_list = response.get('Instances').get('Instance') result = map(_print_instance_id, instance_list) logging.info("current region include instance %s", result)def _print_instance_id(item): instance_id = item.get('InstanceId'); return instance_iddef _print_region_id(item): region_id = item.get("RegionId") return region_id# send open api requestdef _send_request(request): request.set_accept_format('json') try: response_str = clt.do_action(request) logging.info(response_str) response_detail = json.loads(response_str) return response_detail except Exception as e: logging.error(e)if __name__ == '__main__': logging.info("Hello Aliyun OpenApi!") hello_aliyun_regions() list_instances()
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