k8s学习之secret、configmap

我爱海鲸 2024-10-07 16:03:11 暂无标签

简介配置文件的挂载

k8s的安装:http://www.haijin.xyz/list/article/486

1、创建一个secret加密数据:

作用:加密数据存在oted里面,让Pod容器以挂载Volume方式进行访问

场景:凭证

secret.yaml:

apiVersion: v1
kind: Secret
metadata:
  name: mysecret
type: Opaque
data:
  username: YWRtaW4=
  password: MWYyZDFlMmU2N2Rm

kubectl apply -f secret.yaml  #创建

 kubectl get secret    # 查看secret

创建一个pod:

secret-var.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
  - name: nginx
    image: nginx
    env:
      - name: SECRET_USERNAME
        valueFrom:
          secretKeyRef:
            name: mysecret
            key: username
      - name: SECRET_PASSWORD
        valueFrom:
          secretKeyRef:
            name: mysecret
            key: password

kubectl get pods

 kubectl exec -it mypod bash  #进入到pod中

echo $SECRET_USERNAME  #查看变量

echo $SECRET_PASSWORD

以数据卷的方式进行挂载

kubectl delete -f secret-var.yaml  #删除之前的pod

创建一个yaml文件

secret-vol.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
  - name: nginx
    image: nginx
    volumeMounts:
    - name: foo
      mountPath: "/etc/foo"
      readOnly: true
  volumes:
  - name: foo
    secret:
      secretName: mysecret

进入到容器中

cd /etc/foo

cat password

cat username

2、以configmap的形式创建

作用:存储不加密数据到etcd,让Pod以变量或者Volume挂载到容器中

场景:配置文件

现在我们来创建一个以redis为例的实例

kubectl get secret

kubectl delete secret mysecret  #删除之前创建的secret

kubectl get pods

kubectl delete pod mypod  #删除之前创建的pod

创建一个redis的配置文件

redis.properties:

redis.host=127.0.0.1
redis.port=6379
redis.password=123456

kubectl create configmap redis--config --from-file=redis.properties  #创建configmap

kubectl get cm  #查看configmap

kubectl describe cm redis--config  #查看详细信息

以Volume挂载到pod容器中:

创建一个cm文件:

cm.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
    - name: busybox
      image: busybox
      command: [ "/bin/sh","-c","cat /etc/config/redis.properties" ]
      volumeMounts:
      - name: config-volume
        mountPath: /etc/config
  volumes:
    - name: config-volume
      configMap:
        name: redis--config
  restartPolicy: Never

kubectl apply -f cm.yaml #创建pod

kubectl logs mypod

以变量的形式挂载的pod中

kubectl delete -f cm.yaml  # 删除之前的pod

创建yaml文件

myconfig.yaml:

apiVersion: v1
kind: ConfigMap
metadata:
  name: myconfig
  namespace: default
data:
  special.level: info
  special.type: hello

kuectl apply -f myconfig.yaml  #创建cm

kubectl get cm  #查看cm

config-var.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
    - name: busybox
      image: busybox
      command: [ "/bin/sh", "-c", "echo $(LEVEL) $(TYPE)" ]
      env:
        - name: LEVEL
          valueFrom:
            configMapKeyRef:
              name: myconfig
              key: special.level
        - name: TYPE
          valueFrom:
            configMapKeyRef:
              name: myconfig
              key: special.type
  restartPolicy: Never

kubectl apply -f config-var.yaml #创建pod

kubectl get pod  # 查看pod

kubectl logs mypod  # 查看日志

总结:configmap与secret类似 但是cm不进行加密 一般使用为配置文件

你好:我的2025