Managing Deployments Using Kubernetes Engine

“Managing Deployments Using Kubernetes Engine”

Pengantar

Praktik Dev Ops akan secara teratur menggunakan beberapa penerapan untuk mengelola skenario penerapan aplikasi seperti “Penerapan Berkelanjutan”, “Penempatan Biru-Hijau”, “Penempatan Canary” dan banyak lagi. Lab ini memberikan latihan dalam penskalaan dan pengelolaan container sehingga Anda dapat menyelesaikan skenario umum ini di mana beberapa penerapan heterogen digunakan.

Set zone

gcloud config set compute/zone us-central1-a

Get Contoh Code

gsutil -m cp -r gs://spls/gsp053/orchestrate-with-kubernetes .
cd orchestrate-with-kubernetes/kubernetes

gcloud container clusters create bootcamp --num-nodes 5 --scopes "https://www.googleapis.com/auth/projecthosting,storage-rw"

Deployment object

kubectl explain deployment
kubectl explain deployment --recursive
kubectl explain deployment.metadata.name

Buat deployment

• Update code

nano deployments/auth.yaml

Edit bagian image

...
containers:
- name: auth
  image: "kelseyhightower/auth:1.0.0"
...

• Buat deployment

kubectl create -f deployments/auth.yaml
kubectl get deployments

• Buat Replica

kubectl get replicasets

• Cek pod

kubectl get pods

• Buat Service

kubectl create -f services/auth.yaml

• Buat hello deployment

kubectl create -f deployments/hello.yaml
kubectl create -f services/hello.yaml

• Buat frontend

kubectl create secret generic tls-certs --from-file tls/
kubectl create configmap nginx-frontend-conf --from-file=nginx/frontend.conf
kubectl create -f deployments/frontend.yaml
kubectl create -f services/frontend.yaml

• cek service frontend

kubectl get services frontend

Scale Deployment

• Explain

kubectl explain deployment.spec.replicas

• replica

kubectl scale deployment hello --replicas=5

• Cek pod

kubectl get pods | grep hello- | wc -l

• Scale lagi

kubectl scale deployment hello --replicas=3

• Cek lagi pod nya

kubectl get pods | grep hello- | wc -l

Rolling update

• Edit Deployment

kubectl edit deployment hello

Ganti bagian image

...
containers:
  image: kelseyhightower/hello:2.0.0
...

• buat replica

kubectl get replicaset

• Cek history

kubectl rollout history deployment/hello

Pause rolling update

• pause

kubectl rollout pause deployment/hello

• Cek state

kubectl rollout status deployment/hello

kubectl get pods -o jsonpath --template='{range .items[*]}{.metadata.name}{"\t"}{"\t"}{.spec.containers[0].image}{"\n"}{end}'

Resume rolling update

• Resume

kubectl rollout resume deployment/hello

• Cek status

kubectl rollout status deployment/hello

Rollback update

• Rollout

kubectl rollout undo deployment/hello

• Cek History

kubectl rollout history deployment/hello

kubectl get pods -o jsonpath --template='{range .items[*]}{.metadata.name}{"\t"}{"\t"}{.spec.containers[0].image}{"\n"}{end}'

Canary deployments

• Buat Canary Deployment

kubectl create -f deployments/hello-canary.yaml

• Cek deployment

kubectl get deployments

• Cek hello

curl -ks https://`kubectl get svc frontend -o=jsonpath="{.status.loadBalancer.ingress[0].ip}"`/version

Blue-green deployments

• Update service

kubectl apply -f services/hello-blue.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-green
spec:
  replicas: 3
  selector:
    matchLabels:
      app: hello
  template:
    metadata:
      labels:
        app: hello
        track: stable
        version: 2.0.0
    spec:
      containers:
        - name: hello
          image: kelseyhightower/hello:2.0.0
          ports:
            - name: http
              containerPort: 80
            - name: health
              containerPort: 81
          resources:
            limits:
              cpu: 0.2
              memory: 10Mi
          livenessProbe:
            httpGet:
              path: /healthz
              port: 81
              scheme: HTTP
            initialDelaySeconds: 5
            periodSeconds: 15
            timeoutSeconds: 5
          readinessProbe:
            httpGet:
              path: /readiness
              port: 81
              scheme: HTTP
            initialDelaySeconds: 5
            timeoutSeconds: 1

• Buat green deployment

kubectl create -f deployments/hello-green.yaml

• Update service

kubectl apply -f services/hello-green.yaml

• Cek status

curl -ks https://`kubectl get svc frontend -o=jsonpath="{.status.loadBalancer.ingress[0].ip}"`/version

Blue-Green Rollback

• Update service

kubectl apply -f services/hello-blue.yaml

• cek status

curl -ks https://`kubectl get svc frontend -o=jsonpath="{.status.loadBalancer.ingress[0].ip}"`/version

Penutup

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