使用 AWS Lambda 计算正在运行和停止的 Ec2 实例 [英] Count Running and Stopped Ec2 Instances with AWS Lambda

问题描述

如何使用 boto3 和 AWS Lambda 函数计算特定区域中运行和停止的 EC2 实例的数量?

How can I count number of running and stopped EC2 instances in a particular region using boto3 and an AWS Lambda function?

推荐答案

这里有一些代码，用于检索实例列表并计算 stopped 和 running 实例的数量:

Here's some code that retrieves a list of instances and count the number of stopped and running instances:

import boto3

def lambda_handler(event, context):
    
    ec2_resource = boto3.resource('ec2')
    instances = [instance.state["Name"] for instance in ec2_resource.instances.all()]
    
    print('Running: ', instances.count('running'))
    print('Stopped: ', instances.count('stopped'))

对ec2_resource.instances.all() 的调用检索所有实例的列表，并且有一个包含Namestate 属性> 状态.

The call to ec2_resource.instances.all() retrieves a list of all instances, and there is a state attribute that contains the Name of the state.

这将在 Lambda 函数的默认区域中运行.如果您想更改区域，请像这样指定区域名称:

This will run in the default region for the Lambda function. If you wish to change regions, specify the region name like this:

ec2_resource = boto3.resource('ec2', region_name='ap-southeast-2')

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更新:如何通过 SNS 收到通知.

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Update: How to be notified via SNS.

如果您想通过 SNS 收到通知，有两种选择:

If you want to be notified via SNS, there are two options:

• 让 Lambda 函数使用 publish(PhoneNumber='123') 命令，或
• 让 Lambda 函数使用 publish(TopicArn=xxx) 命令向 Amazon SNS 主题发送消息，然后通过首选方法(例如电子邮件、SMS)订阅 SNS 主题.

• Have the Lambda function directly send an SMS message to your phone via Amazon SNS using the publish(PhoneNumber='123') command, or
• Have the Lambda function send a message to an Amazon SNS topic using the publish(TopicArn=xxx) command, and then subscribe to the SNS topic via the preferred method (eg email, SMS).

请注意，实例启动/停止需要一分钟左右的时间，因此如果您将此与启动/停止实例的代码结合使用，在发出这些命令后，计数将不会立即准确.

Please note that it will take a minute or so for instances to start/stop, so if you combine this with code that starts/stops instances, the count will not be accurate immediately after issuing those commands.

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