keda-redis-demo

Taskfile.yml

version: '3'

vars:
  DEMO_NAME: "keda"

tasks:

  cluster-create:
    desc: Start the k3d cluster
    cmds:
    - k3d cluster create {{.DEMO_NAME}}-demo
    
  install-keda:
    desc: Install keda via helm
    cmds:
    - helm repo add kedacore https://kedacore.github.io/charts
    - helm upgrade --install keda kedacore/keda --namespace keda --create-namespace --kube-context k3d-{{.DEMO_NAME}}-demo

  install-redis:
    desc: Install redis via helm
    cmds:
    - helm repo add bitnami https://charts.bitnami.com/bitnami
    - helm upgrade --install redis bitnami/redis --set auth.enabled=false --set architecture=standalone --namespace keda-demo --create-namespace --kube-context k3d-{{.DEMO_NAME}}-demo

  demo-web-app:
    desc: create a demo web app deploymwnt we can scale
    cmds:
    - |
      cat <<EOF | kubectl -n keda-demo apply -f -
      apiVersion: apps/v1
      kind: Deployment
      metadata:
        name: web-app
      spec:
        replicas: 1
        selector:
          matchLabels:
            app: web-app
        template:
          metadata:
            labels:
              app: web-app
          spec:
            containers:
            - name: web-container
              image: nginx:latest
              resources:
                requests:
                  memory: "64Mi"
                  cpu: "250m"
                limits:
                  memory: "128Mi"
                  cpu: "500m"
      EOF

  redis-scaler-deployment:
    desc: create a redis scaler
    cmds:
    - |
      cat <<EOF | kubectl apply -f -
      apiVersion: keda.sh/v1alpha1
      kind: ScaledObject
      metadata:
        name: redis-scaler
      spec:
        scaleTargetRef:
          apiVersion: apps/v1
          kind: Deployment
          name: web-app
        pollingInterval: 15
        cooldownPeriod: 30
        minReplicaCount: 1
        maxReplicaCount: 10
        triggers:
        - type: redis
          metadata:
            # based on the svc name: 
            # "redis-master" . "keda-demo" (namespace) . "svc.cluster.local" (cluster-suffix)
            address: redis-master.keda-demo.svc.cluster.local:6379
            listName: my-queue
            listLength: "10"
            password: ""
            databaseIndex: "0"
            key: "hits"
            type: string
            operator: GT
            threshold: "2"
      EOF

  populate-redis-queue:
    desc: populate the redis queue
    cmds:
    - |
      cat <<EOF | kubectl apply -f -
      apiVersion: batch/v1
      kind: Job
      metadata:
        name: populate-redis-queue
      spec:
        template:
          spec:
            containers:
            - name: redis-cli
              image: redis:latest
              command: ["sh", "-c", "redis-cli -h redis-master.keda-demo.svc.cluster.local -p 6379 lpush my-queue item1 item2 item3 item4 item5 item6 item7 item8 item9"]
            restartPolicy: Never
      EOF

  help:
    desc: Show help
    cmds:
    - task --list

  setup:
    desc: run the initial setup
    cmds:
    - task: cluster-create
    - task: install-keda
    - task: install-redis
    - task: demo-web-app
    - task: redis-scaler-deployment
  
  demonstrate-scale:
    desc: run the initial setup
    cmds:
    - task: populate-redis-queue