关于kubernetes:KubernetesSecret创建与挂载

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从文件导入至 Secret

$ echo -n 'admin' >./username.txt

$ echo -n '1f2d1e2e67df' > ./password.txt

$ kubectl create secret generic db-user-pass --from-file=./username.txt --from-file=./password.txt
secret/db-user-pass created

$ kubectl get secret
NAME                  TYPE                                  DATA   AGE
db-user-pass          Opaque                                2      7s
default-token-58nkl   kubernetes.io/service-account-token   3      13d

$ kubectl describe secrets/db-user-pass
Name:         db-user-pass
Namespace:    default
Labels:       <none>
Annotations:  <none>

Type:  Opaque

Data
====
username.txt:  5 bytes
password.txt:  12 bytes

$ kubectl get secret db-user-pass -o yaml
apiVersion: v1
data:
  password.txt: MWYyZDFlMmU2N2Rm
  username.txt: YWRtaW4=
kind: Secret
metadata:
  creationTimestamp: "2020-08-01T13:22:42Z"
  managedFields:
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:data:
        .: {}
        f:password.txt: {}
        f:username.txt: {}
      f:type: {}
    manager: kubectl
    operation: Update
    time: "2020-08-01T13:22:42Z"
  name: db-user-pass
  namespace: default
  resourceVersion: "19559"
  selfLink: /api/v1/namespaces/default/secrets/db-user-pass
  uid: 7de7d667-9fd9-4d6e-8217-907b0715a77d
type: Opaque

通过 volume 将 Secret 挂载到文件中

$ echo -n 'admin' | base64
YWRtaW4=

$ echo -n '1f2d1e2e67df' | base64
MWYyZDFlMmU2N2Rm

$ cat secrets.yaml 
apiVersion: v1
kind: Secret
metadata:
  name: mysecret
type: Opaque
data:
  password: MWYyZDFlMmU2N2Rm
  username: YWRtaW4=

$ kubectl apply -f ./secrets.yaml
secret/mysecret created

$ kubectl get secret
NAME                  TYPE                                  DATA   AGE
db-user-pass          Opaque                                2      9m8s
default-token-58nkl   kubernetes.io/service-account-token   3      13d
mysecret              Opaque                                2      4s

$ kubectl get secret mysecret -o yaml
apiVersion: v1
data:
  password: MWYyZDFlMmU2N2Rm
  username: YWRtaW4=
kind: Secret
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","data":{"password":"MWYyZDFlMmU2N2Rm","username":"YWRtaW4="},"kind":"Secret","metadata":{"annotations":{},"name":"mysecret","namespace":"default"},"type":"Opaque"}
  creationTimestamp: "2020-08-01T13:31:46Z"
  managedFields:
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:data:
        .: {}
        f:password: {}
        f:username: {}
      f:metadata:
        f:annotations:
          .: {}
          f:kubectl.kubernetes.io/last-applied-configuration: {}
      f:type: {}
    manager: kubectl
    operation: Update
    time: "2020-08-01T13:31:46Z"
  name: mysecret
  namespace: default
  resourceVersion: "19746"
  selfLink: /api/v1/namespaces/default/secrets/mysecret
  uid: 9bf3cc24-a53c-4ecc-a9c3-04b03deecca2
type: Opaque

# 创立一个 Pod 来测试是否胜利挂载到文件中
$ cat secret-pod.yaml 
apiVersion: v1
kind: Pod
metadata:
  labels:
    name: secret-test
  name: secret-test
spec:
  volumes:
  - name: secrets
    secret:
      secretName: mysecret
  containers:
  - image: myapp:v1
    name: db
    volumeMounts:
    - name: secrets
      mountPath: "/etc/secrets"
      readOnly: true

$ kubectl create -f secret-pod.yaml
pod/secret-test created

$ kubectl exec -ti secret-test -- sh
# cat /etc/secrets/username
admin# 
# cat /etc/secrets/password
1f2d1e2e67df# 
# exit

通过 valueFrom 将 secret 挂载到环境变量

# 创立一个 pod 测试是否能胜利从环境变量中读取
$ cat pod-secret-import-env.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pod-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: pod-1
        image: 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 apply -f pod-secret-import-env.yaml
deployment.apps/pod-deployment created

$ kubectl get pod
NAME                              READY   STATUS      RESTARTS   AGE
dapi-test-pod                     0/1     Completed   0          41m
dapi-test-pod2                    0/1     Completed   0          44m
dapi-test-pod3                    0/1     Completed   0          40m
pod-deployment-5f5c6b6d8b-kzg7r   1/1     Running     0          16s
pod-deployment-5f5c6b6d8b-pzvc8   1/1     Running     0          16s
secret-test                       1/1     Running     0          4m3s

$ kubectl exec -ti pod-deployment-5f5c6b6d8b-kzg7r env
PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=pod-deployment-5f5c6b6d8b-kzg7r
TERM=xterm
TEST_USER=admin
TEST_PASSWORD=1f2d1e2e67df
KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
KUBERNETES_PORT_443_TCP_PROTO=tcp
KUBERNETES_PORT_443_TCP_PORT=443
KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
KUBERNETES_SERVICE_HOST=10.96.0.1
KUBERNETES_SERVICE_PORT=443
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_PORT=tcp://10.96.0.1:443
LANG=C.UTF-8
PYTHONIOENCODING=UTF-8
GPG_KEY=C01E1CAD5EA2C4F0B8E3571504C367C218ADD4FF
PYTHON_VERSION=2.7.18
PYTHON_PIP_VERSION=20.0.2
PYTHON_GET_PIP_URL=https://github.com/pypa/get-pip/raw/d59197a3c169cef378a22428a3fa99d33e080a5d/get-pip.py
PYTHON_GET_PIP_SHA256=421ac1d44c0cf9730a088e337867d974b91bdce4ea2636099275071878cc189e
NAME=World
HOME=/root

正文完