Make a Service Deploy System

Why do need a Deploy Interface?

• Kubernetes is a very complex system.
  • ex) pod, deployment, svc, secrets, configmap, daemonset, hpa ...
• Deployment points of interest are all different.

Deploy Manifest

• DockerFile build path
• list of configurations to use
• Deploying workloads (Deployment, ReplicaSet, StatefulSet, DaemonSet, CronJob ...)
  - Workfload Resource Spec
  • Serving ports
  • Pod lifecycle, HealthCheck ...
• Ingress settings for traffic

Distinctive Points of the Deployment Manifest

• host mapping
  • istio gateway - ingress, egress
  • virtual service resource

example)

services:
	app:
		image: app
		class: s1.xlarge
		# ...
		ports:
			- name: http
				port: 8080
			- name: grpc
				port: 8081
routes:
	- name: "http"
		protocol: http
		host:
			- scope: public
		backend:
			- service: app
				port: http
	- name: "grpc"
		protocol: grpc
		host:
			- scope: internal
		backend:
			- service: app
				port: grpc

• For haproxy or nginx to run a separate process for grpc

• class: s1.xlarge : resources.limits.cpu: 4000m ….

  →

  export const instanceClassMap = new Map([
  	['s1.nano', {
  		limits: { cpu: '1000m', memory: '500Mi' },
  		requests: { cpu: '1000m', memory: '500Mi' }
  	}],
  	['s1.micro' ... ]
  ])

Developer creates a deployment manifest (deploy/values.yaml for each repo), goes through the template engine, and deployment system enters the kubernetes manifest to apply

• Template Engine
  • Helm Template
  • cdk8s
    • A development framework that allows you to create Kubernetes manifests in any programming language.
      • java, typescript, javascript, golang, python …
      • Portability to other programs is good.
        • ex) Provided as an npm package
    • Build structures around frequently changing values
      • Region in which it is deployed
      • Configuration in which it is deployed
      • Built image tag
      • Application config list ...
    • Values that don't change often
      • Components of the app
      • Ports of the app
      • Configure app's health check
      • configure settings ...
  • kustomize
  • helmfile