A presentation at J-Fall by Holly Cummins
cloud chaos and microservices mayhem Holly Cummins IBM Garage @holly_cummins
things you need to do well in 2020: @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
things you need to do well in 2020: @holly_cummins handwashing #IBMGarage + IBM Cloud © 2020 IBM Corporation
things you need to do well in 2020: @holly_cummins handwashing apps #IBMGarage + IBM Cloud © 2020 IBM Corporation
things you need to do well in 2020: @holly_cummins handwashing apps ops #IBMGarage + IBM Cloud © 2020 IBM Corporation
things you need to do well in 2020: @holly_cummins handwashing apps ops devops #IBMGarage + IBM Cloud © 2020 IBM Corporation
things you need to do well in 2020: @holly_cummins handwashing apps ops devops devsecops #IBMGarage + IBM Cloud © 2020 IBM Corporation
things you need to do well in 2020: @holly_cummins handwashing apps ops devops devsecops finops #IBMGarage + IBM Cloud © 2020 IBM Corporation
@holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
management @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
The cloud makes it so easy to provision hardware. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
That doesn’t mean the hardware is free. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Or useful. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Hey boss, I created a Kubernetes cluster. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Hey boss, I created a Kubernetes cluster. I forgot it for 2 months. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Hey boss, I created a Kubernetes cluster. I forgot it for 2 months. … and it’s €1000 a month. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Photo by daveynin, flickr
2017 survey 25% of 16,000 servers doing no useful work @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
2017 survey “perhaps someone forgot to turn them off” 25% of 16,000 servers doing no useful work @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
finops figuring out who in your company forgot to turn off their cloud @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
tracing @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
packaging (and fat jars) @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
performance requirements @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
memory footprint is money startup time is money @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
ahead of time compilation is (actually) a good idea @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
releasing @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
releasing @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
@holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
“we’re moving too slowly. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
“we’re moving too slowly. we should modernise our COBOL application into microservices. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
“we’re moving too slowly. we should modernise our COBOL application into microservices. … but our release board only meets twice a year.” @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
modularity @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
microservices are not the goal @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
microservices are not the goal they are the means @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
wishful mimicry @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
cloud != microservices @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
“every time we touch one microservice, all the others break.” @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
distributed monolith @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
distributed monolith but without compile-time checking … or guaranteed function execution @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
distributed monolith but without compile-time checking … or guaranteed function execution @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
distributed monolith but without compile-time checking … or guaranteed function execution @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
distributed monolith but without compile-time checking … or guaranteed function execution @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Courtesy NASA/ JPL-Caltech © 2019 IBM Corporation
IBM Cloud © 2020 IBM Corporation
IBM Cloud © 2020 IBM Corporation
metric units
metric units imperial units
metric units imperial units distributing did not help
distributed != decoupled @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
reasons not to do microservices small team not planning to release independently don’t want complexity of a service mesh - or worse yet, rolling your own domain model doesn’t split nicely @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
“each of our microservices has duplicated the same object model … with twenty classes and seventy fields” @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Domain Microservice @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Domain Microservice @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
Domain Microservice (this is bad) @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
If you’re going to do microservices, you need to get good at automation. And testing. @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
IBM Cloud © 2020 IBM Corporation
the test pyramid IBM Cloud © 2020 IBM Corporation
the test pyramid IBM Cloud © 2020 IBM Corporation
the test pyramid IBM Cloud © 2020 IBM Corporation
the test pyramid IBM Cloud © 2020 IBM Corporation
How to test a fire alarm? @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
how not to test a fire alarm IBM Cloud © 2020 IBM Corporation
how not to test a fire alarm IBM Cloud © 2020 IBM Corporation
@holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
unit testing a fire alarm @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
uh … is that enough? @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
contract testing a fire alarm @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
contract testing a fire alarm @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
to the code! @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
microservices need consumer-driven contract tests @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
thank you @holly_cummins get the code: ibm.biz/holly-jfuture @holly_cummins #IBMGarage + IBM Cloud © 2020 IBM Corporation
The way we use Java has changed. Applets - or any browser-side Java - are a long, long, time ago. Java moved to the back end, and stayed there, but the back-end has gotten bigger, more distributed, and more complicated. Some things that were a good idea ten years ago turn out to be a terrible idea in the cloud; and what used to be ‘good enough’ for testing really isn’t anymore. Managing microservices architecture demands a lot of us, to ensure observability, operational resiliency, and organisational agility. This talk will introduce some of the new tools, patterns, and best practices for Java development in 2020. It also gives a tour of some of the most painful anti-patterns Holly as seen as a consultant with the IBM Garage.
The following resources were mentioned during the presentation or are useful additional information.
for free. You
can too.