18、Secret

IT兄弟团 2020-08-01

Secret 存在意义

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

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 hub.hlc.com/library/myapp:v1
pod/nginx created
$ kubectl get pods
NAME        READY   STATUS    RESTARTS   AGE
testnuinx   1/1     Running   0          105s
$ kubectl exec nginx -- ls /run/secrets/kubernetes.io/serviceaccount
ca.crt
namespace
token

Opaque Secret

I、创建说明

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
data:
  password: MWYyZDFlMmU2N2Rm
  username: YWRtaW4=

II、使用方式

1、将 Secret 挂载到 Volume 中

apiVersion: v1
kind: Pod
metadata:
  labels:
    name: seret-test
  name: seret-test
spec:
  volumes:
  - name: secrets
    secret:
      secretName: mysecret
  containers:
  - image: hub.hlc.com/library/myapp:v1
    name: db
    volumeMounts:
    - name: secrets
      mountPath: "readOnly: true"
      readOnly: true

II、使用方式1、将 Secret 挂载到 Volume 中2、将 Secret 导出到环境变量中

apiVersion: apps/v1
kind: Deployment
metadata:
  name: pod-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: pod-deployment
  template:
    metadata:
      labels:
        app: pod-deployment
    spec:
      containers:
      - name: pod-1
        image: hub.hlc.com/library/myapp:v1
        ports:
        - containerPort: 80
        env:
        - name: TEST_USER
          valueFrom:
            secretKeyRef:
              name: mysecret
              key: username
        - name: TEST_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysecret
              key: password
$ kubectl exec pod-deployment-5877f7ddf8-rhs5j -it -- bash

$ echo $TEST_USER
admin

$ echo $TEST_PASSWORD
1f2d1e2e67df

kubernetes.io/dockerconfigjson

使用 Kuberctl 创建 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.

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: roc/awangyang:v1
  imagePullSecrets:
     - name: myregistrykey

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