Lambda函数检查特定标签是否不存在-​​python [英] Lambda function to check if specific tag do NOT exists-python

问题描述

我正在尝试获得以下消息:

I'm trying to get following:

获取具有以下任一条件的所有EC2实例:

Get all EC2 instances that either:

1. 被标记为所有者和值未知或未知
2. 缺少标签所有者

我能够完成1)，但不知道如何获得2)

I'm able to accomplish 1) but no idea how to get 2)

import boto3   
import collections     
import datetime     
import time     
import sys 

ec = boto3.client('ec2', 'eu-west-1')     
ec2 = boto3.resource('ec2', 'eu-west-1')     


def lambda_handler(event, context):           
    instance_ids = []
    reservations = ec.describe_instances(     
        Filters=[     
            {'Name': 'tag:Owner', 'Values': ['Unknown', 'unknown']},     
        ]     
    ).get('Reservations', []) 

    for reservation in reservations:
          instances = reservation['Instances']
          for instance in instances:
              instance_ids.append(instance['InstanceId'])

    print("Stopping instances: {}".format(','.join(instance_ids)))

推荐答案

就像我在评论中说的，您要放弃 Owner 过滤器，以便您的响应中也包含没有Owner标签的实例，然后您可以进行本地过滤.

Like I said in the comment you want to forgo the Owner filter so your response includes instances without Owner tag as well, and then you get to filtering locally.

reservations = ec.describe_instances().get('Reservations', [])
for reservation in reservations:
    for instance in reservation['Instances']:
        tags = {}
        for tag in instance['Tags']:
            tags[tag['Key']] = tag['Value']

        if not 'Owner' in tags:
            print instance['InstanceId'] + " does not have Owner tag"
        elif tags['Owner'] in ['Unknown', 'unknown']:
            print instance['InstanceId'] + " has [U|u]nknown Owner tag"

如果您的帐户中有大量实例，则对describe_instances的响应可能会被分页，因此您也必须对其进行处理.

If you have a large number of instances in your account, the response to describe_instances may be paginated, and you'll have to deal with that as well.

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