☰

如何使用 instanceID 以外的内容来定位实例

tag-icon • tag-icon amazon-web-services amazon-lambda
如何使用 instanceID 以外的内容来定位实例

我试图实现的目标是，我有大约 8 个测试实例，我想在下班时停止它们以节省成本。然后当我回到工作岗位时重新启动它们。

我有一个功能可以实现我需要的功能

import boto3
region = 'cn-north-1'
instances = ['i-xxxxxx', 'i-xxxxxxx', 'i-xxxxxx', 'i-xxxxxx', 'i-xxxxxxxx']
ec2 = boto3.client('ec2', region_name=region)

def lambda_handler(event, context):
    ec2.stop_instances(InstanceIds=instances)
    print('stopped your instances: ' + str(instances))

问题是我在所有实例上都有不可变的部署策略，因此它instances会不断变化，我必须每天更新该功能。

有没有什么方法可以通过标签或其他更通用的方法进行定位，这样我就不必每天更新功能了？

我查看了文档，但还是不太清楚 https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/ec2.html

答案1

大多数人应该使用实例调度程序，但在中国地区却不能使用。

替代解决方案

互联网上有几十个示例可以帮助你实现这一点。其中之一是这里。基本上，您无需对实例 ID 进行硬编码，而是使用 boto3 API 通过标签查找实例。

此功能还允许您使用标签更改开始/停止时间。您可以截取此代码的部分内容并修改您的代码（来自这里我认为）来将其纳入其中。

import boto3
import time

##
# First function will try to filter for EC2 instances that contain a tag named `Scheduled` which is set to `True`
# If that condition is meet function will compare current time (H:M) to a value of the additional tags which defines the trigger `ScheduleStop` or `ScheduleStart`.
# Value of the `ScheduleStop` or `ScheduleStart` must be in the following format `H:M` - example `09:00`  
# 
# In order to trigger this function make sure to setup CloudWatch event which will be executed every minute. 
# Following Lambda Function needs a role with permission to start and stop EC2 instances and writhe to CloudWatch logs.
# 
# Example EC2 Instance tags: 
# 
# Scheduled     : True
# ScheduleStart : 06:00
# ScheduleStop  : 18:00
##

#define boto3 the connection
ec2 = boto3.resource('ec2')

def lambda_handler(event, context):

    # Get current time in format H:M
    current_time = time.strftime("%H:%M")

    # Find all the instances that are tagged with Scheduled:True
    filters = [{
            'Name': 'tag:Scheduled',
            'Values': ['True']
        }
    ]

    # Search all the instances which contains scheduled filter 
    instances = ec2.instances.filter(Filters=filters)

    stopInstances = []   
    startInstances = []   

    # Locate all instances that are tagged to start or stop.
    for instance in instances:

        for tag in instance.tags:

            if tag['Key'] == 'ScheduleStop':

                if tag['Value'] == current_time:

                    stopInstances.append(instance.id)

                    pass

                pass

            if tag['Key'] == 'ScheduleStart':

                if tag['Value'] == current_time:

                    startInstances.append(instance.id)

                    pass

                pass

            pass

        pass

    print current_time

    # shut down all instances tagged to stop. 
    if len(stopInstances) > 0:
        # perform the shutdown
        stop = ec2.instances.filter(InstanceIds=stopInstances).stop()
        print stop
    else:
        print "No instances to shutdown."

    # start instances tagged to stop. 
    if len(startInstances) > 0:
        # perform the start
        start = ec2.instances.filter(InstanceIds=startInstances).start()
        print start
    else:
        print "No instances to start."

标准溶液

对于大多数人来说这是最好的解决方案。

使用AWS 实例调度程序， 按照本教程。它根据您定义的时间表，基于标签启动和停止实例。

我不会在这里复制粘贴文章，因为信息偶尔会发生变化，并且 AWS 会很好地保持其文档更新。

相关内容