k8s--Secret

1 Secret 存在意義

Secret 解決了密碼、token、密鑰等敏感數據的配置問題，而不需要把這些敏感數據暴露到鏡像或者 Pod Spec中。Secret 可以以 Volume或者環境變量的方式使用

2 Secret 有三種類型

• Service Account：用來訪問 Kubernetes API，由 Kubernetes 自動創建，並且會自動掛載到 Pod的/run/secrets/kubernetes.io/serviceaccount目錄中
• Opaque：base64編碼格式的Secret，用來存儲密碼、密鑰等
• kubernetes.io/dockerconfigjson：用來存儲私有 docker registry 的認證信息

3 Service Account

Service Account 用來訪問 Kubernetes API，由 Kubernetes 自動創建，並且會自動掛載到 Pod的/run/secrets/kubernetes.io/serviceaccount目錄中

 

4、Opaque Secret

Opaque 類型的數據是一個 map 類型，要求 value 是 base64 編碼格式：

[root@wyl01 secrets]# echo -n"admin" | base64
YWRtaW4=
[root@wyl01 secrets]# echo -n"123456" | base64
MTIzNDU2

[root@wyl01 secrets]# cat mysecrets.yaml
apiVersion: v1
kind: Secret
metadata:
  name: mysecret
type: Opaque
data:
 password: MTIzNDU2
 username: YWRtaW4=

[root@wyl01 secrets]# kubectl describe secrets mysecret 
Name:         mysecret
Namespace:    default
Labels:       <none>
Annotations:  
Type:         Opaque

Data
====
password:  6 bytes
username:  5 bytes

將 Secret 掛載到 Volume 中

[root@wyl01 secrets]# cat test1-secrets-pod.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: test1-secret-pod
  labels:
    name: secret-test
spec:
  volumes:
    - name: secrets
      secret:
        secretName: mysecret
  containers:
    - image: ikubernetes/myapp:v1
      name: db
      volumeMounts:
        - name: secrets
          mountPath: "/etc/secrets"
          readOnly: true

[root@wyl01 ~]# kubectl get pod -owide --show-labels |grep test1
test1-secret-pod             1/1     Running     0          28s     10.244.2.24   wyl01-hf-aiui   <none>           <none>            name=secret-test

將 Secret 導出到環境變量中

[root@wyl01 secrets]# cat test2-secrets-deployment.yaml 
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: ikubernetes/myapp:v1
        ports:
        - containerPort: 80
        env:
        - name: TEST_USER
          valueFrom:
            secretKeyRef:
              name: mysecret
              key: username
        - name: TEST_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysecret
              key: password