背景： AWS 中国区的报警机制短信有局限性，弯道转移至其他机制
操作记录
基本逻辑：
cloudwatch 触发 SNS 服务，并且由SNS服务触发lambda函数执行Python脚本，进行发送钉钉通知。
1. 创建SNS 主题，用于接收cloudwatch 触发的报警。
比较简单，过程省略。。。
2. 配置 cloudwatch 触发SNS 通知
下图实例中，配置了 状态变更为警报时触发SNS以及 状态变更为正常时 触发SNS
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3. 创建lambda角色
在【IAM】 点击 创建【角色】，【AWS产品】下选择 【lambda】，点击 【下一步】，搜索 权限 【AWSLambdaExecute】，点击【审核】 创建
4.创建函数
下面示例是创建函数并且赋予制定权限。
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下面实例是配置 lambda触发器。
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Python 示例代码：
# -*- coding: utf-8 -*-
import json
from botocore.vendored import requests
def lambda_handler(event,context): # text type
url="https://oapi.dingtalk.com/robot/send?access_token=wefwefwefwefsdgfdgwqwef4"
message = event['Records'][0]['Sns']
Timestamp=message['Timestamp']
Subject=message['Subject']
if "ALARM" in Subject:
title="警报！！警报！！"
elif "OK" in Subject:
title="故障恢复"
pagrem={
"msgtype":"markdown",
"markdown": {"title":"AWS"+title,
"text":"## "+title+"\n ### 时间:"+Timestamp+" \n ### 内容："+Subject+" \n"
},
"at":{
"atMobiles":[
"185xxxxxxxx"
]
},
"isAtAll": "true"
}
headers={
'Content-Type':'application/json'
}
requests.post(url,data=json.dumps(pagrem),headers=headers)
额外注意：
lambda的Python 函数模块较常用的有些区别，所以导入模块时注意 AWS lambda专属的模块列表，请参照下面列表。
https://gist.github.com/gene1wood/4a052f39490fae00e0c3#file-list_aws_lambda_modules-py-L14
lambda日志存放位置：
image.png
这里有个lambda的测试 功能，即将手动设置一个数据输入，来测试lambda函数是否书写正确。
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配置测试模板实例（即cloudwatch 触发的SNS 的数据源输入格式）：
image.png
测试数据源代码
{
"Records": [
{
"EventSource": "aws:sns",
"Sns": {
"MessageAttributes": {},
"SignatureVersion": "1",
"Type": "Notification",
"Message": "{\"AlarmName\":\"RC-[HIGH]-grafana-group unhealthy>1\",\"AlarmDescription\":\"Created from EC2 Console\",\"AWSAccountId\":\"xxxxxx\",\"NewStateValue\":\"ALARM\",\"NewStateReason\":\"Threshold Crossed: 1 out of the last 1 datapoints [1.0 (10/10/18 11:52:00)] was greater than or equal to the threshold (1.0) (minimum 1 datapoint for OK -> ALARM transition).\",\"StateChangeTime\":\"2018-10-10T11:53:08.426+0000\",\"Region\":\"China (Ningxia)\",\"OldStateValue\":\"OK\",\"Trigger\":{\"MetricName\":\"UnHealthyHostCount\",\"Namespace\":\"AWS/ApplicationELB\",\"StatisticType\":\"Statistic\",\"Statistic\":\"MAXIMUM\",\"Unit\":null,\"Dimensions\":[{\"name\":\"LoadBalancer\",\"value\":\"app/nx-rc-rancher-inner/0689e303d72560ff\"},{\"name\":\"TargetGroup\",\"value\":\"targetgroup/grafana-ec2-rc-ops/8xxxxx\"}],\"Period\":60,\"EvaluationPeriods\":1,\"ComparisonOperator\":\"GreaterThanOrEqualToThreshold\",\"Threshold\":1.0,\"TreatMissingData\":\"\",\"EvaluateLowSampleCountPercentile\":\"\"}}",
"UnsubscribeUrl": "https://sns.cn-northwest-1.amazonaws.com.cn/?Action=Unsubscribe&SubscriptionArn=arn:aws-cn:sns:cn-northwest-1:xxxxx:SMS-TEST:46a6b2a2-c594-4d56-ae2f-56243292bdc0",
"TopicArn": "arn:aws-cn:sns:cn-northwest-1:xxxxx:SMS-TEST",
"Signature": "YwtAajUhBLhS/Rtwv8dCCcKwVpglHX1hzLa0gnfRdaQ/EH5zdQk9tCAFDxvT/9z+7jiBnIZgZrNX2pCoYgU61ONYuEZ74chbxjwKfF43YxHeTIsuyPBcsTyXLsJhwE+Tem2aXRllmABC4yO0tbDIwTCSSNF8fMwlm5aOc4HO28VhVOLnuqRP1XnAglO7sJfhD6oWjN+vVvyydmkFxbC8NpxgTpuwAwT6zKsUEHWvzmhRe9bhuxwIdg/Agyip6zgGVs0rDLBbh0Tu61RgqgrDxbUp9JPklkbLR5i+ILBd110msHH8rX43KypYuzgjLtvab3YQuioqUotrdJE+/G8MeQ==",
"SigningCertUrl": "https://sns.cn-northwest-1.amazonaws.com.cn/SimpleNotificationService-23551b0f4cfca4c8a720c40328560ad3.pem",
"Timestamp": "2018-10-10T11:53:08.484Z",
"Subject": "OK: \"RC-[HIGH]-grafana-group unhealthy>1\" in China (Ningxia)",
"MessageId": "99cc6911-5be6-5ae1-bc5d-3d26b182f2ba"
},
"EventVersion": "1.0",
"EventSubscriptionArn": "arn:aws-cn:sns:cn-northwest-1:415056052465:SMS-TEST:46a6b2a2-c594-4d56-ae2f-56243292bdc0"
}
]
}
通知实例：
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image.png
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遇到的坑
- requests 模块不能直接导入，需要像示例中导入才能使用
- def 的函数name好像是固定的，不能修改
后续继续研究 cloudwatch直接触发lambda函数是如何处理以及Python自建包能否导入使用.
这个纯属学习AWS lambda的入门，AWS 这个lambda自称伟大到可以实现无服务器架构，这个还要继续深入学习
