Serverless Ping
Once a minute this lambda function will check to see if your endpoint is up. If so it will send the response time to Cloudwatch. A Cloudwatch alarm will then email you when the endpoint is down (ALARM) or if the lambda function stops working (INSUFFICENT RESULTS).
Cloudwatch Event (1 minute) > AWS Lambda > Cloudwatch Data > Cloudwatch Alarm > SNS Topic > SNS Email Subscription
Estimated Costs: $0.05/month (not including free tier) source
Setup
Install the serverless commandline tools
npm install -g serverless
Deploy this service to AWS (swap out parameters for your needs)
serverless deploy \
--ping-name=google \
--ping-host=https://google.com \
--ping-alarm-email=alertme@gmail.com
That's it! 🎉
Cleanup
To remove all resources created run
serverless remove \
--ping-name=google \
--ping-host=https://google.com \
--ping-alarm-email=alertme@gmail.com
Additional Options
Alarm namespace - By default the cloudwatch data will be put under the Serverless/Ping namespace. You can override it using --ping-alarm-namespace.
--ping-alarm-namespace=MyNamespace/Ping
Exception Monitoring - Any exceptions thrown in the lambda function will be logged to CloudWatch Logs. If you would like them also sent to sentry add the DSN as another paramter to the serverless deploy command above.
--ping-sentry-dsn=https://*********:*******@sentry.io/*****
Contributing
Installing dependencies. Vendored dependencies are included in the git repo to make it easier for users to deploy this.
pip3 install -t vendored/ -r requirements.txt --upgrade