k8s学习(三) k8s集群内部署一个docker应用

1、获取一个springboot 应用jar包

2、将jar包打成docker镜像

Dockerfile如下：

FROM java:8-alpine
ADD docker-hello-world-0.0.1-SNAPSHOT.jar app.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar", "/app.jar"]

打镜像：

docker build -t hellword:0.0.4 .

3、准备docker 镜像私服
参考https://blog.csdn.net/u011943534/article/details/81331231

4、配置私服地址

编辑/etc/docker/daemon.json,添加nexus仓库地址

{ 
	"exec-opts": ["native.cgroupdriver=systemd"],
	"insecure-registries":["192.168.100.89:80", "172.16.10.190:8008", "quay.io", "k8s.gcr.io", "gcr.io"] 
}

重启docker

systemctl restart docker

5、将镜像推送到远程私服

docker tag helloworld:0.0.4 172.16.10.190:8008/helloworld:0.0.4

登陆nexus

docker login --username=admin 172.16.10.190:8008
输入密码登陆
docker push 172.16.10.190:8008/helloworld:0.0.4

6、配置secret拉取私有镜像仓库内容

kubectl create secret docker-registry myregistrykey --docker-server=172.16.10.190:8008 --docker-username=admin --docker-password=admin123 [email protected]
获取创建的secret
kubectl get secrets

NAME                                     TYPE                                  DATA   AGE
cluster-admin-dashboard-sa-token-hld8l   kubernetes.io/service-account-token   3      3d19h
default-token-7c9dp                      kubernetes.io/service-account-token   3      4d
myregistrykey                            kubernetes.io/dockerconfigjson        1      3d16h
myregistrykey2                           kubernetes.io/dockerconfigjson        1      3d16h
myregistrykey3                           kubernetes.io/dockerconfigjson        1      3d16h
myregistrykey4                           kubernetes.io/dockerconfigjson        1      2d22h
myregistrykey5                           kubernetes.io/dockerconfigjson        1      2d22h
myregistrykey6                           kubernetes.io/dockerconfigjson        1 

7、创建deployment.yaml
imagePullSecrets处配置上一步获得的secret

---
 
apiVersion: extensions/v1beta1
 
kind: Deployment
 
metadata:
 
  name: kube-node
 
spec:
 
  replicas: 2
 
  template:
 
    metadata:
 
      labels:
 
        app: web
 
    spec:
 
      containers:
 
        - name: kube-node-demo-instance
 
          image: kube-node-demo1
 
          ports:
 
            - containerPort: 8081
      imagePullSecrets:
       - name: myregistrykey

8、部署

kubectl create -f deployment.yaml

9、查看部署状态
如果状态为running部署成功

[[email protected] k8s]# kubectl get pods
NAME                        READY   STATUS    RESTARTS   AGE
kube-node-87dcfc9cf-9kj8j   1/1     Running   0          25m
kube-node-87dcfc9cf-l2ppz   1/1     Running   0          25m
  

10、测试应用

[[email protected] k8s]# kubectl get pods -o wide
NAME                        READY   STATUS    RESTARTS   AGE   IP            NODE        NOMINATED NODE   READINESS GATES
kube-node-87dcfc9cf-9kj8j   1/1     Running   0          26m   10.244.1.23   k8s-node3   <none>           <none>
kube-node-87dcfc9cf-l2ppz   1/1     Running   0          26m   10.244.2.24   k8s-node2   <none>           <none>


[[email protected] k8s]# curl 10.244.2.24:8080/index
hello,world

11、如果要删除应用，可以删除deployment

kubectl delete deployment/kube-node