# Secret（信息数据卷） Kubemetes提供了Secret来处理敏感数据，比如密码、Token和密钥，相比于直接将敏感数据配置在Pod的定义或者镜像中，Secret提供了更加安全的机制**`(Base64加密)`**。 Secret可以以Volume或者环境变量的方式使用 Secret有三种类型： - **Service Account**：用来访问Kubernetes API，由Kubernetes自动创建，并且会自动挂载到Pod的`/run/secrets/kubernetes.io/serviceaccount`目录中 - **Opaque**：base64编码格式的Secret，用来存储密码、密钥等 - **kubernetes.io/dockerconfigjson**：用来存储私有docker registry的认证信息 ## Opaque Secret Opaque类型的数据是一个map类型，要求value是base64编码格式： ``` $ echo -n "admin" | base64 YWRtaW4= $ echo -n "1f2d1e2e67df" | base64 MWYyZDFlMmU2N2Rm ``` secrets.yaml ``` apiVersion: v1 kind: Secret metadata: name: mysecret type: Opaque # secret类型 data: password: MWYyZDFlMmU2N2Rm username: YWRtaW4= ``` ### 将Secret挂载到Volume中 ``` apiVersion: v1 kind: Pod metadata: labels: name: db name: db spec: volumes: - name: secrets secret: secretName: mysecret # 对应secrets.yaml中的name containers: - image: gcr.io/my_project_id/pg:v1 name: db volumeMounts: - name: secrets # 对应volumes中的name mountPath: "/etc/secrets" # 挂载到容器文件 readOnly: true ports: - name: cp containerPort: 5432 hostPort: 5432 ``` ### 将Secret导出到环境变量中 ``` apiVersion: extensions/v1beta1 kind: Deployment metadata: name: wordpress-deployment spec: replicas: 2 strategy: type: RollingUpdate template: metadata: labels: app: wordpress visualize: "true" spec: containers: - name: "wordpress" image: "wordpress" ports: - containerPort: 80 env: - name: WORDPRESS_DB_USER valueFrom: secretKeyRef: name: mysecret # 对应secrets.yaml中的name key: username # 对应secret的key - name: WORDPRESS_DB_PASSWORD valueFrom: secretKeyRef: name: mysecret # 对应secrets.yaml中的name key: password # 对应secret的key ``` ## kubernetes.io/dockerconfigjson 直接读取`~/.docker/config.json`的内容来创建 ``` $ cat ~/.docker/config.json | base64 $ cat > myregistrykey.yaml <<EOF apiVersion: v1 kind: Secret metadata: name: myregistrykey data: .dockerconfigjson: UmVhbGx5IHJlYWxseSByZWVlZWVlZWVlZWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWxsbGxsbGxsbGxsbGxsbGxsbGxsbGxsbGxsbGxsbGx5eXl5eXl5eXl5eXl5eXl5eXl5eSBsbGxsbGxsbGxsbGxsbG9vb29vb29vb29vb29vb29vb29vb29vb29vb25ubm5ubm5ubm5ubm5ubm5ubm5ubm5ubmdnZ2dnZ2dnZ2dnZ2dnZ2dnZ2cgYXV0aCBrZXlzCg== type: kubernetes.io/dockerconfigjson EOF $ kubectl create -f myregistrykey.yaml ``` 创建Pod的时候，通过`imagePullSecrets`来引用刚创建的`myregistrykey` ``` apiVersion: v1 kind: Pod metadata: name: foo spec: containers: - name: foo image: janedoe/awesomeapp:v1 imagePullSecrets: - name: myregistrykey ```