https://github.com/joemiller/simple-uptime-checker

WIP. simple http uptime checker experiment, implemented as aws lambdas
https://github.com/joemiller/simple-uptime-checker

Last synced: 13 days ago
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WIP. simple http uptime checker experiment, implemented as aws lambdas

• Host: GitHub
• URL: https://github.com/joemiller/simple-uptime-checker
• Owner: joemiller
• Created: 2015-11-19T15:24:55.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2015-11-19T15:25:07.000Z (about 9 years ago)
• Last Synced: 2023-03-11T06:58:10.123Z (over 1 year ago)
• Language: HCL
• Size: 4.88 KB
• Stars: 1
• Watchers: 0
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
simple-uptime-checker

=====================

An AWS Lambda experiment.

A pingdom-like URL monitor implemented primarily using AWS Lambdas, with SNS for passing

control between lambdas, and API gateway as control interface.

Tech Spec

---------

### api gateway / user interface

- /checks

    - GET - lambda:get_checks

    - POST ? - lambda:add_checks

    - DELETE - lambda:remove_checks

### checker flow

Description: On a timer, execute a lambda (queue_checks) that reads a list of URLs

from a database (dynamoDB?) and publishes each URL to SNS topic (check_runner). A lambda

(run_check) will be executed for each URL published. Results (http-code + duration) are

published to SNS topic (check_results). A final lambda (store_result) reads results

from the check_results topic and processes them (sends to graphite, other datastores, etc)

- `lambda:queue_checks`

    - event source:  scheduled task: every X secs,

    - enumerates a list of checks to run from the db, send each to `sns:check_runner`

- `lambda:run_check`

    - event source: `sns:check_runner`

    - execute check, send result to `sns:check_results`

            - initial check will just be a simple http check, with results being: ``{'code': 200, 'time': 600 }``

- `lambda:store_result`

    - event source: `sns:check_results`

    - send result to graphite (tcp/2003)

    - send result to other stuff?

    - send result to other sns topics ?

Deployment

----------

Management of AWS resources is managed by Terraform. Get terraform from http://terraform.io and install it in

your $PATH.

Set environment vars:

    export TF_VAR_aws_access_key=$AMAZON_ACCESS_KEY

    export TF_VAR_aws_secret_key=$AMAZON_SECRET_KEY

Run `make plan` to execute terraform in `plan` mode, which will show you what changes it will make

when run in `apply` mode.

Deploy: Run `make all`.