Lambda，AWS和Python的自动化管理操作 - 自动开机和关机

下面是一个例子遍历所有的region查找EC2，如果状态是开机，那就关掉；或者倒过来也可以写成 如果是关机状态，就开机。

import boto3

def lambda_handler(event,context):

    # Get list of regions
    ec2_client = boto3.client(‘ec2‘)
    regions = [region[‘RegionName‘]
               for region in ec2_client.describe_regions()[‘Regions‘]]

    # Iterate over each region
    for region in regions:
        ec2 = boto3.resource(‘ec2‘,region_name=region)

        print("Region:",region)

        # Get only running instances
        instances = ec2.instances.filter(
            Filters=[{‘Name‘: ‘instance-state-name‘,‘Values‘: [‘running‘]}])

        #Stop the instances
        for instance in instances:
            instance.stop()
            print(‘Stopped instance: ‘,instance.id)

        # instances = ec2.instances.filter(
        #     Filters=[{‘Name‘: ‘instance-state-name‘,#               ‘Values‘: [‘stopped‘]}])
        #
        # for instance in instances:
        #     instance.start()
        #     print(‘Start instance: ‘,instance.id)

if __name__ == ‘__main__‘:
    lambda_handler(0,0)

执行一下是工作的

C:UsersyuanPycharmProjectsawsvenvScriptspython.exe C:/Users/yuan/PycharmProjects/aws/StopInstance.py
Region: eu-north-1
Region: ap-south-1
Region: eu-west-3
Region: eu-west-2
Region: eu-west-1
Region: ap-northeast-2
Region: ap-northeast-1
Region: sa-east-1
Region: ca-central-1
Region: ap-southeast-1
Region: ap-southeast-2
Stopped instance:  i-0bb70cc9666ce2af3
Region: eu-central-1
Region: us-east-1
Stopped instance:  i-00e9dc7c254dbe497
Region: us-east-2
Region: us-west-1
Region: us-west-2

然后我们在aws的Lambda里创建一个新的函数， 这里我已经自定义了一个role了，确保这个role可以对ec2有开机和关机的权限

IAM的权限如下所示：

{
  "Version": "2012-10-17","Statement": [
    {
      "Effect": "Allow","Action": [
        "logs:CreateLogGroup","logs:CreateLogStream","logs:PutLogEvents"
      ],"Resource": "arn:aws:logs:*:*:*"
    },{
      "Effect": "Allow","Action": [
        "ec2:DescribeInstances","ec2:DescribeRegions","ec2:StartInstances","ec2:StopInstances"
      ],"Resource": "*"
    }
  ]
}

拷贝函数上来

接下来 在cloudwatch里面添加一个新的rule

创建向导，这里选择schedule，这里使用 cron的表达式，注意他是GMT的时间，因此需要自己和本地时间转换一下

写好之后他会有个友好的提示界面

完成创建

回到Lambda的界面， 可以看见他的触发器多了一个CloudWatch Events

等待执行之后，可以查看日志

也可以确认EC2 服务 的确关机了