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
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$ 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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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:**
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$ echo -n "admin" | base64
YWRtaW4=
$ echo -n "1f2d1e2e67df" | base64
MWYyZDFlMmU2N2Rm
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secrets.yaml
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apiVersion: v1
kind: Secret
metadata:
name: mysecret
type: Opaque
data:
password: MWYyZDFlMmU2N2Rm
username: YWRtaW4=
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Ⅱ、使用方式
1、将 Secret 挂载到 Volume 中
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apiVersion: v1
kind: Pod
metadata:
labels:
name: seret-test
name: seret-test
spec:
volumes:
- name: secrets
secret:
secretName: mysecret
containers:
- image: wangyanglinux/myapp:v1
name: db
volumeMounts:
- name: secrets
mountPath: "/etc/secrets"
readOnly: true
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2、将 Secret 导出到环境变量中
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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: pod-deployment
spec:
replicas: 2
template:
metadata:
labels:
app: pod-deployment
spec:
containers:
- name: pod-1
image: wangyanglinux/myapp:v1
ports:
- containerPort: 80
env:
- name: TEST_USER
valueFrom:
secretKeyRef:
name: mysecret
key: username
- name: TEST_PASSWORD
valueFrom:
secretKeyRef:
name: mysecret
key: password
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kubernetes.io/dockerconfigjson
使用 Kuberctl 创建 docker registry 认证的 secret
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$ 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.
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在创建 Pod 的时候,通过 imagePullSecrets 来引用刚创建的 `myregistrykey`
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apiVersion: v1
kind: Pod
metadata:
name: foo
spec:
containers:
- name: foo
image: roc/awangyang:v1
imagePullSecrets:
- name: myregistrykey
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