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Serverless Web Monitor

Serverless website monitoring tool using Serverless Framework V1.

Lambda function send http request every 5min(default). If the response changed, send alert message to AWS SNS. Manage monitoring website in web page provided by API Gateway, Lambda and DynamoDB.

Setup

This app will create

  • API endpoints
  • Lambda Functions
  • DynamoDB Table
  • SNS Topic

Serverless Setup

Install serverless framework and setup AWS credential. See: Serverless Framework Documentation

Deploy Application

$ git clone https://github.com/haw-itn/serverless-web-monitor.git
$ cd serverless-web-monitor
$ npm install
$ sls deploy

You can see the result of deploy like this.

Serverless: Creating Stack...
Serverless: Checking Stack create progress...
.....
Serverless: Stack create finished...
Serverless: Packaging service...
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading service .zip file to S3 (2.01 MB)...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
......................................................................................................................
Serverless: Stack update finished...
Service Information
service: serverless-web-monitor
stage: dev
region: ap-northeast-1
api keys:
  None
endpoints:
  GET - https://xxxxxxxxx.execute-api.ap-northeast-1.amazonaws.com/dev/sites
  POST - https://xxxxxxxxx.execute-api.ap-northeast-1.amazonaws.com/dev/sites/register
  POST - https://xxxxxxxxx.execute-api.ap-northeast-1.amazonaws.com/dev/sites/remove
functions:
  serverless-web-monitor-dev-sns: arn:aws:lambda:ap-northeast-1:1234567890:function:serverless-web-monitor-dev-sns
  serverless-web-monitor-dev-remove: arn:aws:lambda:ap-northeast-1:1234567890:function:serverless-web-monitor-dev-remove
  serverless-web-monitor-dev-probe: arn:aws:lambda:ap-northeast-1:1234567890:function:serverless-web-monitor-dev-probe
  serverless-web-monitor-dev-dashboard: arn:aws:lambda:ap-northeast-1:1234567890:function:serverless-web-monitor-dev-dashboard
  serverless-web-monitor-dev-register: arn:aws:lambda:ap-northeast-1:1234567890:function:serverless-web-monitor-dev-register
  serverless-web-monitor-dev-trigger: arn:aws:lambda:ap-northeast-1:1234567890:function:serverless-web-monitor-dev-trigger

Regist Subscriber

To receive alert, create subscription to SNS topic. This app will create SNS topic named serverless-web-monitor.

Access Control

We recommend to restrict access to these API endpoints. (e.g. AWS WAF with CloudFront)

If you set private: true in serverless.yml, all API endpoints require API Key.

custom:
  private: true 
  +----------------+               
  |   CloudFront   |               +-------------+
  |        +       | -- API Key -> | API Gateway |
  |       WAF      |               +-------------+
  +----------------+               

Further Improvements

  • Authentication with Amazon Cognito

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