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Secret

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Secret解决了 密码token密钥敏感 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:

Opaque Secret

Opaque 类型的数据是一个 map 类型,要求 valuebase64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
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