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+。
|
1
|
pip install aliyun-python-sdk-ecs
|
如果提示您没有权限，请切换sudo继续执行。
|
1
|
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。
|
1
2
3
4
|
from aliyunsdkcore import client
from aliyunsdkecs.request.v20140526.DescribeInstancesRequest import DescribeInstancesRequest
from aliyunsdkecs.request.v20140526.DescribeRegionsRequest import DescribeRegionsRequest
clt = 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。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
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_id
def _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：
|
1
2
3
|
[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。
|
1
2
3
4
5
6
7
8
9
10
|
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：
|
1
|
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。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
# 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 check
import json
import logging
from aliyunsdkcore import client
from aliyunsdkecs.request.v20140526.DescribeInstancesRequest import DescribeInstancesRequest
from 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_id
def _print_region_id(item):
region_id = item.get("RegionId")
return region_id
# send open api request
def _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()
|