A presentation at All Day DevOps by Karthik Gaekwad
TRACK: MODERN INFRASTRUCTURE NOVEMBER 12, 2020 Once Upon A Time in Kubernetes Operator Land…. Karthik Gaekwad @iteration1 Head of Cloud Native Engineering Verica
TRACK: MODERN INFRASTRUCTURE Karthik Gaekwad ● ● ● ● ● Head of Cloud Native Engineering at Verica. Authored Learning Kubernetes and a many other cloudnative courses on LinkedIn learning. Built Oracle Managed Kubernetes Engine and Principal Developer Advocate for Oracle Cloud. Organizes: Devopsdays Austin, Cloud Austin, All Day Devops, Container Days. @iteration1 on twitter
TRACK: MODERN INFRASTRUCTURE verica.io/book
TRACK: MODERN INFRASTRUCTURE Today… • • • • What are Kubernetes Operators Why Use Cases for Operators Demo (How To Operators) Conclusions
TRACK: MODERN INFRASTRUCTURE What are Operators? • NOT the people who run or work with Kubernetes….
TRACK: MODERN INFRASTRUCTURE What are Operators? • Kubernetes Software Pattern • Create Custom Resources to manage applications and components. • Part of the Kubernetes Control Loop, and allows you to extend the Kubernetes API
TRACK: MODERN INFRASTRUCTURE Operators v/s API v/s Helm Why should I build an operator versus just using the Kubernetes Client API or Helm? IF you… • Need added control over the lifecycle of object creation, updating. • Building an application to control/manage Kubernetes applications. • Need to be able to access internal Kube components (inside out versus outside in)
TRACK: MODERN INFRASTRUCTURE Operator Examples Chaos Engineering Verification • Use an operator to run verifications. • Read/Update/Delete Kubernetes resources (like pods) • Finer control over resources in the cluster (timing, traffic shaping etc). • Verification State Management while it’s running.
TRACK: MODERN INFRASTRUCTURE What Languages? • Most Common: • • • Golang Ansible Helm • Newer! • Java • • Python • • https://kubernetes.io/blog/2019/11/26/develop-a-kubernetes-controller-in-java/ https://medium.com/swlh/building-a-kubernetes-operator-in-python-with-zalandos-kopf-37c311d8 edff Others? • Come talk to me after the talk- Interested to learn more
TRACK: MODERN INFRASTRUCTURE Development Lifecycle
TRACK: MODERN INFRASTRUCTURE Maturity Model https://docs.openshift.com/container-platform/4.1/applications/operators/olm-what-operators-are.html#olm-maturity-model_olm-what-operators-are
TRACK: MODERN INFRASTRUCTURE Demo!
TRACK: MODERN INFRASTRUCTURE Docs and Community • Community: https://github.com/operator-framework/community-ope rators • Docs: https://sdk.operatorframework.io/docs/
TRACK: MODERN INFRASTRUCTURE Conclusions - Operators allow you to build custom applications in a Kubernetes Cluster. - Allows you to extend a Kubernetes Application - What will you build?
TRACK: MODERN INFRASTRUCTURE THANK YOU TO OUR SPONSORS
…I really wanted to build an Operator to control some resources in my cluster. After some trial and error I got things to work, and it took me many a moon to understand what was going on. Many documents were read, and many blogs were parsed, and finally I was able to understand what was going on. Then, I decided that for this story to have a happy ending, I was going to do a live demo of what Kubernetes Operators are, how they work, and how you can run them locally, and in your cluster. So come read this amazing code with me, laugh while I fumble through typos, cry with me when our code doesn’t compile, and finally, rejoice when we both create an operator together during this tale!
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