如何在 Boto3 中按日期过滤 Ec2 实例的标签值

Question

我正在尝试获取具有标记名称“ttl”和标记值“比今天更早”的实例。 我们的用户根据未来日期 (yyyy.mm.dd) 标记他们的实例，因此脚本不应在该日期之前自动删除它们。下面的过滤器应该只能获取标签值小于今天日期的实例。有没有办法根据这个逻辑过滤标签值 -> 让我得到

today = = datetime.today().strftime('%Y.%m.%d')

filters = [{'Name': 'tag:ttl','Values': ['<today']},{'Name': 'instance-state-name','Values': ['running']}]

完整的代码如下所示：

import boto3
import logging

#setup 简单的 INFO 日志记录

logger = logging.getLogger()
logger.setLevel(logging.INFO)

#定义连接

ec2 = boto3.resource('ec2')
def lambda_handler(event, context):

filters = [{'Name': 'tag:ttl','Values': ['<today']},{'Name': 'instance-state-name','Values': ['running']}]

#locate all running instances
RunningInstances = [instance.id for instance in instances]

print (RunningInstances)

#make sure there are actually instances to shut down.

if len(RunningInstances) > 0:

shuttingDown = ec2.instances.filter(InstanceIds=RunningInstances).stop()
print "shuttingDown"


else:
    print "Nothing to see here"

Answer 1

您无法按照您指定的方式比较查询中的日期。您需要编写一些代码来比较 Python 脚本中的日期并采取行动。大致如下：

import datetime
import boto3


# Connect to EC2
ec2 = boto3.resource('ec2')

def get_ttl(instance):
    for tag in instance.tags:
        if 'ttl'in tag['Key']:
            ttl = tag['Value']
            return ttl

def lambda_handler(event,context):
    running_instances = ec2.instances.filter(Filters=[{
        'Name': 'instance-state-name',
        'Values': ['running']}])

    for instance in running_instances:
            ttl = get_ttl(instance)
            if ttl:
                if datetime.date.today() > datetime.datetime.strptime(ttl, "%Y-%m-%d").date():
                    print('stopping instance')
                else:
                    print("nothing to do here")

基本上，它解决了比较日期问题

In [30]: datestring = '2021-02-22'

In [31]: datetime.date.today() == datetime.datetime.strptime(datestring, "%Y-%m-%d").date()
Out[31]: False

In [32]: datetime.date.today() <  datetime.datetime.strptime(datestring, "%Y-%m-%d").date()
Out[32]: True

In [33]: datetime.date.today() >  datetime.datetime.strptime(datestring, "%Y-%m-%d").date()
Out[33]: False