Deploy Application to Alibaba ASK (Serverless Kubernetes) Cluster

2021年01月10日

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For multiple K8S cluster environments, create the kube config file.
# vim /tmp/kubeconfig

The KUBECONFIG environment variable is a list of paths to configuration files. If you have a $HOME/.kube/config file, set it to your KUBECONFIG environment variable.
# export KUBECONFIG=$HOME/.kube/config

Append /tmp/kubeconfig to your KUBECONFIG environment variable.
# export KUBECONFIG=$KUBECONFIG:/tmp/kubeconfig

# kubectl get nodes

NAME                           STATUS   ROLES   AGE     VERSION
virtual-kubelet-cn-beijing-h   Ready    agent   3d23h   v1.18.8-aliyun.1

# vim nginx.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  ports:
  - port: 80
    protocol: TCP
  selector:
    app: nginx
  type: LoadBalancer
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deploy
  labels:
    app: nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image:  nginx:alpine
        ports:
        - containerPort: 80
        resources:
          requests:
            cpu: "2"
            memory: "4Gi"

Make sure SNAT resource is configured for the ASK environment.

# kubectl apply -f nginx.yaml

service/nginx-service created
deployment.apps/nginx-deploy created

查看Pod状态
# kubectl get pod

NAME                           READY   STATUS    RESTARTS   AGE
nginx-deploy-cb9fdfbb9-l9g4m   1/1     Running   0          66s
nginx-deploy-cb9fdfbb9-rkp2t   1/1     Running   0          66s

查看Serivce状态
# kubectl get svc

NAME            TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
kubernetes      ClusterIP      172.21.0.1     <none>        443/TCP        3d23h
nginx-service   LoadBalancer   172.21.10.52   8.xxx.xx.55   80:31763/TCP   2m14s

通过SLB IP访问Nginx应用
# curl 8.xxx.xx.55

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

扩容Deployment
查看Deployment
# kubectl get deploy

NAME           READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deploy   2/2     2            2           8m40s

扩容Deployment
# kubectl scale deploy nginx-deploy --replicas=10

deployment.apps/nginx-deploy scaled

查看扩容后的Pod
# kubectl get pod

NAME                           READY   STATUS    RESTARTS   AGE
nginx-deploy-cb9fdfbb9-24dsd   1/1     Running   0          70s
nginx-deploy-cb9fdfbb9-76b8g   1/1     Running   0          70s
nginx-deploy-cb9fdfbb9-f5nsz   1/1     Running   0          70s
nginx-deploy-cb9fdfbb9-k7gzp   1/1     Running   0          70s
nginx-deploy-cb9fdfbb9-l9g4m   1/1     Running   0          11m
nginx-deploy-cb9fdfbb9-mgmmp   1/1     Running   0          70s
nginx-deploy-cb9fdfbb9-mzf2k   1/1     Running   0          70s
nginx-deploy-cb9fdfbb9-nfqj7   1/1     Running   0          70s
nginx-deploy-cb9fdfbb9-rkp2t   1/1     Running   0          11m
nginx-deploy-cb9fdfbb9-scvxj   1/1     Running   0          70s

配置HPA，可以让应用随着负载压力自动进行弹性扩容。当应用的CPU负载增高时，将水平扩容出更多的Pod副本
将应用副本缩容到1个
# kubectl scale deploy nginx-deploy --replicas=1

deployment.apps/nginx-deploy scaled

查看Pod
# kubectl get pod

NAME                           READY   STATUS    RESTARTS   AGE
nginx-deploy-cb9fdfbb9-rkp2t   1/1     Running   0          12m

配置HPA
# kubectl autoscale deployment nginx-deploy --cpu-percent=50 --min=1 --max=10

horizontalpodautoscaler.autoscaling/nginx-deploy autoscaled

查看HPA
# kubectl get hpa

NAME           REFERENCE                 TARGETS         MINPODS   MAXPODS   REPLICAS   AGE
nginx-deploy   Deployment/nginx-deploy   <unknown>/50%   1         10        1          35s

References

一键创建Nginx在线应用

Configure Access to Multiple Clusters

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Category: container Tags: public

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Deploy Application to Alibaba ASK (Serverless Kubernetes) Cluster