KUBERNETES IS FOR MONOLITHS TOOKUBECON 2015, NOV 10, 2015

Steve Reed (@_smreed)

ABOUT MEEarly Kubernetes adopter:

v0.5 in GCE ~Nov 2014One of the first production workloads12 commits, ~143 lines survive today

"GCE PD Data Loss"I have nothing to sell you today :)#3965

MOTIVATIONEverybody should be considering Kubernetes

Google Searches For "Kubernetes" and "Microservices"

Not just for microservices

HELMSMAN OF THE TITANIC

Probably don't do this.Remove this slide if someone else uses the title.

OBJECT ORIENTED INFRASTRUCTURE?

Kubernetes Primitivesthey describe your applicationthey also describe requirements

Pods, Services, etc are the "interface" between yourinfrastructure and application.

CONTAINERIZE...Monolithic Pod

"Megapod?" "Podolith?"Volume mounts where possible

configurationpersistent storagelogs

SecretsResource Limits?

MONOLITHIC PODEverything's localhostDependencies are specified, enforcableNow make it better!

Demo

REFACTORDatabase, SMTP

Needs to scale independentlyMight be used by other pods as they are addedWant ability to proxyWant dev environment "mocks"

HARDCODE STUFF!Service hostnames are "guaranteed"monolith-db.default.svc.cluster.localsmtp-server.default.svc.cluster.local

localhost for everything inside the podstorage paths/var/log/monolith

MORE IDEAS"Services without selectors"reverse proxy "adapter" container

ssl-terminationauthentication

pgpool "ambassador" to postgres"semantic pipelines"Secrets for certs, auth credentialsDefault ports (80 for HTTP, 443 for HTTPS)replace crond with sidecars, Jobs

BONUS CONTENT?"dueling" replication controllers

THANK YOUJust try Kubernetes.If you want to refactor your app, Kubernetes can help youget started!slides, code, examples@_smreed