Kubernetes 部署常见应用

k8s 安装：https://www.cnblogs.com/jhxxb/p/14321352.html

yaml 文件说明：https://kubernetes.io/zh/docs/concepts/overview/working-with-objects/kubernetes-objects

命名空间：https://kubernetes.io/zh/docs/tasks/administer-cluster/namespaces

创建命令：https://kubernetes.io/zh/docs/tasks/manage-kubernetes-objects/declarative-config/#how-to-create-objects

 

一、使用任意端口暴露

sudo vim /etc/kubernetes/manifests/kube-apiserver.yaml

# 在 - --service-cluster-ip-range=10.96.0.0/16 下添加
- --service-node-port-range=1-65535

# 重启 kubelet
sudo systemctl daemon-reload
sudo systemctl restart kubelet

• targetPort：容器的端口（最根本的入口），与制作容器时暴露的端口一致（DockerFile中EXPOSE），也是 pod 的端口
• port：kubernetes 中服务之间访问的端口，service 的端口
• nodePort：外部可访问的端口。容器所在宿主机的端口（实质上也是通过 service 暴露给了宿主机，而 port 却没有）
• hostPort：通过宿主机的 IP:Port 来访问 Pod，和 nodePort 类似

nodePort 是集群外流量访问集群内服务的端口类型。Port 是集群内的 pod 互相通信用的端口类型。targetPort 是最终端口

 

二、常见应用

MySQL

随机端口，指定端口需要配置 nodePort，或者部署后是用 kubectl edit svc mysql-service 修改

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-mysql
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 10.74.2.71
    path: "/nfs/mysql"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nfs-mysql
  namespace: default
spec:
  accessModes:
    - ReadWriteMany
  storageClassName: ""
  resources:
    requests:
      storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-deployment
spec:
  selector:
    matchLabels:
      app: mysql-label
  replicas: 1
  template:
    metadata:
      labels:
        app: mysql-label
    spec:
      containers:
        - name: mysql
          image: mysql:latest
          env:
            - name: MYSQL_ROOT_PASSWORD
              value: root
            - name: MYSQL_ROOT_HOST
              value: '%'
            - name: TZ
              value: Asia/Shanghai
          ports:
            - containerPort: 3306
          volumeMounts:
            - name: mysql-data
              mountPath: /var/lib/mysql
      volumes:
        - name: mysql-data
          persistentVolumeClaim:
            claimName: nfs-mysql
---
apiVersion: v1
kind: Service
metadata:
  name: mysql-service
spec:
  selector:
    app: mysql-label
  type: NodePort
  ports:
    - port: 3306
      targetPort: 3306

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