45、k8s-数据存储-配置存储-secret-（用于存储配置信息的-比configMap安全）-密文存储

作用：用于存储敏感信息、例如密码、密钥、证书等

实验：创建secret、再将secret挂载到容器里去、使用容器查看 secret存储的信息

1、先 使用base64 对数据进行编码
    ·echo -n 'admin' | base64
    ---------------------------
    YWRtaW4=
    ---------------------------
    ·echo -n '123456' | base64
    -----------------------------
    MTIzNDU2
    ----------------------------
2、编写secret.yaml：
---------------------------------------------------------------------
apiVersion: v1
kind: Secret
metadata:
  name: secret
  namespace: dev
type: Opaque
data:
  username: YWRtaW4=
  password: MIIzNDU2
-------------------------------------------------
3、创建Secret：kubectl create -f secret.yaml
4、查看secret：kubectl describe secret secret -ndev
----------------------------------------------------------
Name:         secret
Namespace:    dev
Labels:       <none>
Annotations:  <none>

Type:  Opaque

Data
====
password:  6 bytes        #只显示字符数
username:  5 bytes
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5、创建pod将secret挂载 进去：vim 
-----------------------------------------------------
apiVersion: v1
kind: Pod
metadata:
  name: pod-secret
  namespace: dev
spec:
  containers:
  - name: nginx
    image: nginx:1.17.1
    volumeMounts:
    - name: volume-secret
      mountPath: /secret/config   #容器里的路径  将这个 路径挂载到secret存储卷

  volumes:
  - name: volume-secret
    secret:
      secretName: secret
---------------------------------------------------------------------------------------
6、创建pod：kubectl create -f pod-secret.yaml
7、查看pod： kubectl get pods pod-secret -ndev
---------------------------------------------------
NAME         READY   STATUS    RESTARTS   AGE
pod-secret   1/1     Running   0          44s
------------------------------------------------
8、进入到容器：kubectl exec -it pod-secret /bin/sh -ndev
-----------------------------------------------------------------
# ls
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  secret  srv  sys  tmp  usr  var
# cd /secret/config
# ls
password  username
# more username
admin
# more password
123456

#secret再 容器里自动解码
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