How to deploy springboot project to k8s

Steps to deploy springboot to k8s

• The springboot project packages the image and deploys it to the image warehouse

• Log in to the private image warehouse and pull the image

• Create deployment

• Expose service access port

Create secret

Log in private The warehouse needs to create a secret to store the authentication information of the docker registry

Create the secret

~$ kubectl create secret docker-registry fdf-docker-secret --docker-server=registry.cn-chengdu.aliyuncs.com --docker-username=17602117026 --docker-password=用户密码
secret/fdf-docker-secret created
~$
~$
~$ kubectl get secret
NAME                TYPE                             DATA   AGE
fdf-docker-secret   kubernetes.io/dockerconfigjson   1      15s

After it is created, it needs to be mounted to the pod later

Create the deployment yaml file

Quickly create a deployment and export the yaml file

~$ kubectl create deployment k8sdemo --image=registry.cn-chengdu.aliyuncs.com/fandf/k8s-test:1.0.0 --dry-run=client -o yaml > k8sdemo.yaml
~$ cat k8sdemo.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: k8sdemo
  name: k8sdemo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: k8sdemo
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: k8sdemo
    spec:
      containers:
      - image: registry.cn-chengdu.aliyuncs.com/fandf/k8s-test:1.0.0
        name: k8s-test
        resources: {}
status: {}
~$

Modify the k8sdemo.yaml file

#1.修改副本数量为2 
#2.挂在secret
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: k8sdemo
  name: k8sdemo
spec:
  replicas: 2
  selector:
    matchLabels:
      app: k8sdemo
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: k8sdemo
    spec:
      imagePullSecrets:
        - name: fdf-docker-secret
      containers:
      - image: registry.cn-chengdu.aliyuncs.com/fandf/k8s-test:1.0.0
        name: k8s-test
        resources: {}
status: {}

Create a deployment

~$ kubectl apply -f k8sdemo.yaml
deployment.apps/k8sdemo created
~$ kubectl get deploy
NAME      READY   UP-TO-DATE   AVAILABLE   AGE
k8sdemo   0/2     2            0           12s
~$ kubectl get deploy
NAME      READY   UP-TO-DATE   AVAILABLE   AGE
k8sdemo   2/2     2            2           24s
~$ kubectl get pod
NAME                       READY   STATUS    RESTARTS   AGE
k8sdemo-65d45fb49f-l4kx5   1/1     Running   0          28s
k8sdemo-65d45fb49f-pqsjw   1/1     Running   0          28s

Create service, nodePort

#port 服务端口    target-port pod端口
~$ kubectl expose deploy k8sdemo --port=9001 --target-port=9001 --type=NodePort
service/k8sdemo exposed
~$
~$ kubectl get svc k8sdemo
NAME      TYPE       CLUSTER-IP    EXTERNAL-IP   PORT(S)          AGE
k8sdemo   NodePort   10.96.10.79   <none>        9001:31921/TCP   12s
~$ curl http://127.0.0.1:31921/api/v1/user/name
zhangsan

You can see that the IP of serviced is 10.96.10.79 and the external port is 31921. The security group needs to open this port to access it.

Even if our service deployment is completed here, take a look at all the nodes

~$ kubectl get secret,pod,svc,deploy
NAME                       TYPE                             DATA   AGE
secret/fdf-docker-secret   kubernetes.io/dockerconfigjson   1      52m
NAME                           READY   STATUS    RESTARTS   AGE
pod/k8sdemo-65d45fb49f-l4kx5   1/1     Running   0          39m
pod/k8sdemo-65d45fb49f-pqsjw   1/1     Running   0          39m
NAME                 TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)          AGE
service/k8sdemo      NodePort    10.96.10.79   <none>        9001:31921/TCP   5m51s
service/kubernetes   ClusterIP   10.96.0.1     <none>        443/TCP          301d
NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/k8sdemo   2/2     2            2           39m
~$

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