serverspec and sensu - testing and monitoring collide

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MICHAEL RICHARDSON - @M_RICHO

Testing and Monitoring Collide

WHAT IS IT?

RSpec Tests for checking your servers are configured correctly

CM/PROVISIONING TOOL AGNOSTIC

CM/PROVISIONING TOOL AGNOSTIC

SERVERS CAN BE BUILT USING• CHEF• PUPPET• CF-ENGINE• ANSIBLE

• SALT STACK• SHELL SCRIPTS• MANUAL HACK• WHAT EVER.

26 RESOURE TYPES INCLUDING• COMMAND• CRON• DEFAULT_GATEWAY• FILE• GROUP• HOST• INTERFACE

• IPTABLES• KERNEL_MODULE• PACKAGE• PORT• PROCESS• SERVICE• USER

That’s super fast

WHEN TO RUN SERVERSPEC TESTS?

??

WHEN TO RUN SERVERSPEC TESTS?

That’s super useful

• When developing or updating config management code (eg puppet/chef)

• When validating a node or environment

WHEN TO RUN SERVERSPEC TESTS?

Hell yeah. That’s a great idea.

• What about every 2 minutes on all hosts orchestrated via your monitoring tool

WHEN TO RUN SERVERSPEC TESTS?

Hell yeah. That’s a great idea.

• What about every 2 minutes on all hosts orchestrated via your monitoring tool

Why?• Fast• Lightweight• Overlaps with traditional

monitoring checks. (Eg. Is the apache service running)

• Simplifies monitoring tool config

WE USE SENSU FOR MONITORING

It’s • Simple• Extensible• Lightweight• Simple to install on linux and windows.

ITERATION 1+GET SENSU TO JUST RUN THE RSPEC TESTS

ITERATION 1+

RSpec stdout isn’t great to simply pass back to a monitoring tool.

ITERATION 1+SURE, WE CAN TIDY UP RSPEC STD OUT

But now have no idea which tests are failing

2 USEFUL FEATURES TO THE RESCUE

1. Rspec has a JSON format option

2. Sensu-Client has a local socket to accept ‘arbitrary’ check results

RSPEC JSON OUTPUT

4 exampletests

Summary results

SENSU CLIENT SOCKET

Send results here

Failures appear here

ITERATION 2+

ITERATION 2+RSpec in json format

Send each test result to sensu socket

Report summary serverspec results to back to sensu defined check

Iterate over results

ITERATION 2+

Summary results Individual test failures

SUMMARY

1. Write comprehensive tests2. Don’t duplicate effort by writing the same thing

again as a monitoring check.3. Simply run your tests via a monitoring tool

THANK YOU

Michael Richardson - @m_richohttps://github.com/m-richo/sensu_check-rspec