Do it in code (not YAML)! Unlock power of Kotlin DSL for Kubernetes

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Do it in code (not YAML)! Unlock power of Kotlin DSL for Kubernetes February, Atlanta, GA 2019 @gamussa @gamussa || #devnexus @devnexus || @confluentincc @confluentinc

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3 @gamussa | #devnexus | @confluentinc

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Raffle, yay! Follow @gamussa Post some 📸 🖼 🏋 😂 Tag @gamussa Hashtag #devnexus

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5 Evolution for YAML in the company Scripts - No YAML Ansible - YAML @gamussa | #devnexus Helm - YAML | ? @confluentinc

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#dangerzone! Following slides may cause pain! @gamussa | #devnexus | @confluentinc

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7 @gamussa | #devnexus | @confluentinc

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8 @gamussa | #devnexus | @confluentinc

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9 @gamussa | #devnexus | @confluentinc

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10 @gamussa | #devnexus | @confluentinc

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12 BASH ??? YAML @gamussa | #devnexus | @confluentinc

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13 Why yaml? @gamussa | #devnexus | @confluentinc

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14 Why, yaml? Why? ● Initial Release in 2001 ● Originally Yet Another Markup Language ● Repurposed as YAML Ain’t Markup Language ● From Wiki: “commonly used for configuration files” ● End goal is to declare something ● YAML is not going anywhere any time soon 😫 @gamussa | #devnexus | @confluentinc

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15 Types? What are you talking about? @gamussa | #devnexus | @confluentinc

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16 @gamussa | #devnexus | @confluentinc

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17 Ok. There is a schema tho https://json-schema.org/ @gamussa | #devnexus | @confluentinc

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18 @gamussa | #devnexus | @confluentinc

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Yaml is ok… for small things

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20 @gamussa | #devnexus | @confluentinc

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21 @gamussa | #devnexus | @confluentinc

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22 if «everything as code» Why I do write so much yaml? @gamussa | #devnexus | @confluentinc

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23 Evolution for YAML in the company Ansible - YAML sh and make - No YAML @gamussa | #devnexus Helm - YAML | @confluentinc Kotlin DSL - No YAML

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24 Let’s talk Kubernetes @gamussa | #devnexus | @confluentinc

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KUBERNETES @gamussa | #devnexus | @confluentinc

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26 Kubernetes Architecture Actually JSON image source: Janakiram MSV

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27 @gamussa | #devnexus | @confluentinc

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28 🤔 THINGS TO THINK ABOUT YAML FOR K8S AT SCALE ●How to avoid copy-pasting? ●How to provide common primitives? ●How to allow customization for teams? ●How to test incremental changes? ●Some tools to analyze current state of clusters @gamussa | #devnexus | @confluentinc

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29 INGRESS EXAMPLE @gamussa | #devnexus | @confluentinc

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30 KOTLIN DSL FOR KUBERNETES @gamussa | #devnexus | @confluentinc

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31 DSL generation ●Generates DSLs from fabric8 types ●Generates fabric8 types from deployed CRDs 😅 @gamussa | #devnexus | @confluentinc

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32 Confluent operator architecture @gamussa | #devnexus | @confluentinc

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33 a custom Kubernetes controller PODS API Server StatefulSets PVs Controllers & Custom Controllers Custom Resources Master Node Worker Node | Applications run on Kubernetes ● Applications use objects like StatefulSets, Configmaps, PVs ● Custom Controllers create custom resources that provide unique application functionality: ConfigMaps Scheduler @gamussa ● Nodes and pods are where #devnexus | @confluentinc ○ Upgrades, elasticity, Kafka Operational Logic

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34 KOTLIN POWER: BUILDERS @gamussa | #devnexus | @confluentinc

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35 KOTLIN POWER: EXTENSION FUNCTIONS @gamussa | #devnexus | @confluentinc

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36 KOTLIN POWER: EXTENSION FUNCTIONS @gamussa | #devnexus | @confluentinc

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https://gamov.dev/devnexus-dsl-2020

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https://github.com/fkorotkov/k8s-kotlin-dsl

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I GUESS YOU FOLKS ARE NOT READY FOR THIS YET 39 BUT YOUR KIDS ARE GONNA LOVE IT @gamussa | #devnexus | @confluentinc

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Thanks! @gamussa viktor@confluent.io https://slackpass.io/confluentcommunity #kubernetes @gamussa | @ #devnexus | @confluentinc