Kubernetes Test Uygulama Deployment Adımları – 2

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Yaml üzerinden kaynaklarımızı oluşturmak için Apply komutunu kullanacağız, YAML’i elle oluşturabiliriz ancak onu bizim için oluşturmak için dry-run=client kullanabiliriz. Bu işlem karmaşık deploymentları taşımak için şablon olarak kullanılabilir.

kubectl create deployment hello-world \
     --image=gcr.io/google-samples/hello-app:1.0 \
     --dry-run=client -o yaml | more
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: hello-world
  name: hello-world
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hello-world
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: hello-world
    spec:
      containers:
      - image: gcr.io/google-samples/hello-app:1.0
        name: hello-app
        resources: {}
status: {}

Deployment işlemini yaml dosyasına yazalım,

root@k8s-c1-cp1:~# kubectl create deployment hello-world \
     --image=gcr.io/google-samples/hello-app:1.0 \
     --dry-run=client -o yaml > deployment.yaml
root@k8s-c1-cp1:~#

Yaml dosyasının içeriğini görüntüleyelim, dağıtımın tamanını gösterir.

root@k8s-c1-cp1:~# more deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: hello-world
  name: hello-world
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hello-world
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: hello-world
    spec:
      containers:
      - image: gcr.io/google-samples/hello-app:1.0
        name: hello-app
        resources: {}
status: {}
root@k8s-c1-cp1:~#

Deploymenti yaml dosyamızı kullanarak oluşturalım, 

kubectl apply -f deployment.yaml
root@k8s-c1-cp1:~# kubectl apply -f deployment.yaml
deployment.apps/hello-world created
root@k8s-c1-cp1:~#

Servis için yaml oluşturalım,

kubectl expose deployment hello-world \
     --port=80 --target-port=8080 \
     --dry-run=client -o yaml | more
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: hello-world
  name: hello-world
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: hello-world
status:
  loadBalancer: {}

Servis yaml manifestosunu bir dosyaya yazalım,

kubectl expose deployment hello-world \
     --port=80 --target-port=8080 \
     --dry-run=client -o yaml > service.yaml

Yaml dosyasının içeriği Servis tanımını gösterir,

root@k8s-c1-cp1:~# more service.yaml 

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: hello-world
  name: hello-world
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: hello-world
status:
  loadBalancer: {}
root@k8s-c1-cp1:~#

Servisi ilgili yaml dosyasını kullanarak oluşturalım,

kubectl apply -f service.yaml

Mevcut durumumuzu, Deployment, ReplicaSet, Poda ve servislere göz gezdirelim.

kubectl get all
root@k8s-c1-cp1:~# kubectl get all
NAME                               READY   STATUS    RESTARTS   AGE
pod/hello-world-5457b44555-96dxx   1/1     Running   0          2m36s

NAME                  TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
service/hello-world   ClusterIP   10.105.238.150   <none>        80/TCP    31s
service/kubernetes    ClusterIP   10.96.0.1        <none>        443/TCP   11h

NAME                          READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/hello-world   1/1     1            1           2m36s

NAME                                     DESIRED   CURRENT   READY   AGE
replicaset.apps/hello-world-5457b44555   1         1         1       2m36s
root@k8s-c1-cp1:~#

Scale up ile deploymentımızı code içerisinde genişletelim,

vi deployment.yaml
Change spec.replicas from 1 to 20
     replicas: 20

İlgili datayı kaydedip çıkalım. Apply ile Deploymentımızı güncelleyelim.

kubectl apply -f deployment.yaml

Ve deploymentımız mevcut yapılandırılmasını kontrol edelim 20/20 olarak replicasetimizi görmeliyiz.

kubectl get deployment hello-world
kubectl get pods | more 
root@k8s-c1-cp1:~# kubectl get deployment hello-world
NAME          READY   UP-TO-DATE   AVAILABLE   AGE
hello-world   20/20   20           20          5m25s
root@k8s-c1-cp1:~# kubectl get pods | more 
NAME                           READY   STATUS    RESTARTS   AGE
hello-world-5457b44555-2m2p5   1/1     Running   0          33s
hello-world-5457b44555-5crqx   1/1     Running   0          33s
hello-world-5457b44555-62ns7   1/1     Running   0          33s
hello-world-5457b44555-6ztvd   1/1     Running   0          33s
hello-world-5457b44555-7c6qq   1/1     Running   0          33s
hello-world-5457b44555-7w4fn   1/1     Running   0          33s
hello-world-5457b44555-8v7q4   1/1     Running   0          33s
hello-world-5457b44555-96dxx   1/1     Running   0          5m29s
hello-world-5457b44555-9lhkh   1/1     Running   0          33s
hello-world-5457b44555-cm2nq   1/1     Running   0          33s
hello-world-5457b44555-flp2z   1/1     Running   0          33s
hello-world-5457b44555-fz25s   1/1     Running   0          33s
hello-world-5457b44555-fz5vn   1/1     Running   0          33s
hello-world-5457b44555-g2hk6   1/1     Running   0          33s
hello-world-5457b44555-gh8bt   1/1     Running   0          33s
hello-world-5457b44555-jrz86   1/1     Running   0          33s
hello-world-5457b44555-ps488   1/1     Running   0          33s
hello-world-5457b44555-sskgr   1/1     Running   0          33s
hello-world-5457b44555-t5tzb   1/1     Running   0          33s
hello-world-5457b44555-zjzfz   1/1     Running   0          33s
root@k8s-c1-cp1:~#

Http request atarak Load Balancing hizmetinin nasıl çalıştığını gözlemleyelim,

kubectl get service hello-world
curl http://$SERVICEIP:PORT
root@k8s-c1-cp1:~# kubectl get service hello-world
NAME          TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
hello-world   ClusterIP   10.105.238.150   <none>        80/TCP    5m41s
root@k8s-c1-cp1:~# curl http://10.105.238.150
Hello, world!
Version: 1.0.0
Hostname: hello-world-5457b44555-5crqx
root@k8s-c1-cp1:~# curl http://10.105.238.150
Hello, world!
Version: 1.0.0
Hostname: hello-world-5457b44555-sskgr
root@k8s-c1-cp1:~# curl http://10.105.238.150
Hello, world!
Version: 1.0.0
Hostname: hello-world-5457b44555-5crqx
root@k8s-c1-cp1:~# curl http://10.105.238.150
Hello, world!
Version: 1.0.0
Hostname: hello-world-5457b44555-gh8bt
root@k8s-c1-cp1:~# curl http://10.105.238.150
Hello, world!
Version: 1.0.0
Hostname: hello-world-5457b44555-g2hk6
root@k8s-c1-cp1:~# curl http://10.105.238.150
Hello, world!
Version: 1.0.0
Hostname: hello-world-5457b44555-zjzfz
root@k8s-c1-cp1:~#

Kubectl ile kaynakları anında düzenleyebilirz ancak bu yaml ımıza hemen yansımaz ancak bu değişiklik etcd de kalıcıdır. Cluster deposunda test için 20 yi 30 olarak güncelleyelim,

kubectl edit deployment hello-world

Deployment 20 den 30 a yükseltilmiş ve 30 adet pod oluşmuştur,

root@k8s-c1-cp1:~# kubectl get deployment hello-world
NAME          READY   UP-TO-DATE   AVAILABLE   AGE
hello-world   30/30   30           30          13m
root@k8s-c1-cp1:~#

Ayrıca scale kullanarak depyloymenti ölçeklendirebiliriz,

kubectl scale deployment hello-world --replicas=40
kubectl get deployment hello-world
root@k8s-c1-cp1:~# kubectl scale deployment hello-world --replicas=40
deployment.apps/hello-world scaled
root@k8s-c1-cp1:~# kubectl get deployment hello-world
NAME          READY   UP-TO-DATE   AVAILABLE   AGE
hello-world   40/40   40           40          14m
root@k8s-c1-cp1:~#

Deploymenti silip, her şeyi kaldıralım,

kubectl delete deployment hello-world
kubectl delete service hello-world
kubectl get all
oot@k8s-c1-cp1:~# kubectl delete deployment hello-world
deployment.apps "hello-world" deleted
root@k8s-c1-cp1:~# kubectl delete service hello-world
service "hello-world" deleted
root@k8s-c1-cp1:~# kubectl get all
NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   11h
root@k8s-c1-cp1:~#

Başka yazımızda görüşmek üzere,

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