Secret
Table of Contents
Secret解决了 密码 、 token 、 密钥 等 敏感 数据的配置问题,而不需要把这些敏感数据暴露到镜像或者Pod Spec中。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.yml:
apiVersion: v1 kind: Secret metadata: name: mysecret type: Opaque data: password: MWYyZDFlMmU2N2Rm username: YWRtaW4=
接着,就可以创建secret了:
$kubectl create -f secrets.yml
创建好secret之后,有两种方式来使用它:
- 以Volume方式
- 以环境变量方式
将Secret挂载到Volume中
apiVersion: v1 kind: Pod metadata: labels: name: db name: db spec: volumes: - name: secrets secret: secretName: mysecret containers: - image: gcr.io/my_project_id/pg:v1 name: db volumeMounts: - name: secrets mountPath: "/etc/secrets" 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 key: username - name: WORDPRESS_DB_PASSWORD valueFrom: secretKeyRef: name: mysecret key: password
kubernetes.io/dockerconfigjson
可以直接用kubectl命令来创建用于docker registry认证的secret:
$ kubectl create secret docker-registry myregistrykey --docker-server=DOCKER_REGISTRY_SERVER --docker-username=DOCKER_USER --docker-password=DOCKER_PASSWORD --docker-email=DOCKER_EMAIL
secret "myregistrykey" created.
也可以直接读取 ~/.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
在创建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
Service Account
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:
$ kubectl run nginx --image nginx
deployment "nginx" created
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-3137573019-md1u2 1/1 Running 0 13s
$ kubectl exec nginx-3137573019-md1u2 ls /run/secrets/kubernetes.io/serviceaccount
ca.crt
namespace
token
Next: ConfigMap | Home:存储 |