@k2r2bai An operator deploys/manages/ configures LINE bot atop Kubernetes SDN x Cloud Native Meetup #14

@k2r2bai About Me ⽩白凱仁(Kyle Bai) • RDSS at inwinSTACK. • Interested in emerging technologies. • Kubernetes Projects Contributor. • Certified Kubernetes Administrator. • CNTUG(Cloud Native Taiwan User Group) co-organizer. • Kubernetes 200+ nodes experience. @kairen(k2r2.bai@gmail.com) https://k2r2bai.com

@k2r2bai • Inspired by a true story • How to implement LINE bot operator? • Live Demo Agenda Today I would like to talk about

Inspired by a true story

@k2r2bai One Today….

@k2r2bai ME FRIEND How to become a PROFESSIONAL HUNTER?

@k2r2bai ME FRIEND You need an AIBO!!

@k2r2bai

@k2r2bai ME FRIEND

@k2r2bai How to become a PROFESSIONAL AGENT? ME FRIEND

@k2r2bai You need a TERMINAL!! ME FRIEND

@k2r2bai So I think we need…

@k2r2bai

@k2r2bai

@k2r2bai

@k2r2bai

@k2r2bai

@k2r2bai But…

@k2r2bai How to deploy/manage/configure?

@k2r2bai • Self-healing • Horizontal scaling • Service discovery and Load balancing • Automated rollouts and rollbacks • Secrets and configuration management • Storage orchestration Kubernetes

@k2r2bai I have a chatbot

@k2r2bai I have a Kubernetes

@k2r2bai Ugh… Bot Operator

@k2r2bai LINE Bot Operator

@k2r2bai • Bot: defines the desired state of the Bot deployment. • Event: defines eventing rules for a bot instance. • EventBinding: defines the set of events to be used by the bot. You select Events to be bound using labels and label selectors. Bot, Event and EventBinding

@k2r2bai Bot, Event and EventBinding

@k2r2bai 我知道這很ㄎ⼀一ㄤ..

@k2r2bai 所以直接來來講怎麼實作吧...

How to implement LINE bot operator?

@k2r2bai • CRD - Custom Resource Definition: definition of new resource in kube that can be used in yaml to specify instances (eg Statefulsets, pre-official cron jobs, prometheus). • Controller: A service that listens for events and acts to converge the system to the desired state from the actual state. • Operator: A controller built with the listen-act pattern based on events from kubernetes on resources. Usually encapsulates a human as an expert system to operate a service. Definitions

@k2r2bai • The CustomResourceDefinition API resource allows you to define custom resources. • Defining a CRD object creates a new custom resource with a name and schema that you specify. • Do not require programming CRD(CustomResourceDefinition)

@k2r2bai • Kubernetes 1.7 has added an important feature called Custom Controllers. • It enables developers to extend and add new functionalities, replace existent ones (like replacing kube-proxy for instance). • And of course, automate administration tasks as if they were a native Kubernetes component. Custom Controllers

@k2r2bai • CRD to specify new resource that the operator manages (optional). • Controller for listening and dispatching events (uses informers, watchers and event handlers) -> runs as a k8s pod/deployment. • API classes to specify a model that represents the data in the CRD. • Internal Model Objects to manipulate the k8s client to create, update and delete resources based on state. • Events: • Added • Updated • Deleted Parts of the Operator

@k2r2bai • Allows manipulation of resource state (eg creation of pod, modification of configmap, deletion of persistent volume). • List resources. • Get details about current resource state. • Creates custom controller. client-go https://github.com/kubernetes/client-go

@k2r2bai

@k2r2bai • Go does not have generics in the language. • Code generation can be done using k8s code generation scripts. • Generation of typed: • Informers • Listers • Clientsets • This should be part of your build process. Code Generation https://github.com/kubernetes/code-generator

@k2r2bai // +genclient // +k8s:deepcopy-gen:inte4aces=k8s.io/apimachinery/pkg/runtime.Object type Bot struct { metav1.TypeMeta `json:",inline"` metav1.ObjectMeta `json:"metadata"` Spec BotSpec `json:"spec"` Status BotStatus `json:"status,omitempty"` }

Live Demo

@k2r2bai KAIREN OUT!! THANK YOU!!!