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K8S之配置管理

2021-05-23 17:01:41 阅读：160 来源： 互联网

标签：kubectl name demo 配置管理 mypod K8S root localhost

文章目录

一、Secret
二、ConfigMap
- 创建方式一：kubectl
- 第二种变量参数形式

一、Secret

加密数据并存放在Etcd中，让Pod的容器以挂载Volume方式访问

应用场景：凭据
https://kubernetes.io/docs/concepts/configuration/secret/
在这里插入图片描述

方式一：

[root@localhost demo]# echo -n 'admin' > ./username.txt
[root@localhost demo]# echo -n '1f2d1e2e67df' > ./password.txt
[root@localhost demo]# kubectl create secret generic db-user-pass --from-file=./username.txt --from-file=./password.txt
secret/db-user-pass created
[root@localhost demo]# kubectl get secret
NAME                  TYPE                                  DATA   AGE
db-user-pass          Opaque                                2      61s
[root@localhost demo]# kubectl describe secret db-user-pass
Name:         db-user-pass
Namespace:    default
Labels:       <none>
Annotations:  <none>

Type:  Opaque

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

方式二：

[root@localhost demo]# echo -n 'admin' | base64
YWRtaW4=
[root@localhost demo]# echo -n '1f2d1e2e67df' | base64
MWYyZDFlMmU2N2Rm

[root@localhost demo]# vim secret.yaml

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


[root@localhost demo]# kubectl create -f secret.yaml 
secret/mysecret created
[root@localhost demo]# kubectl get secret
NAME                  TYPE                                  DATA   AGE
mysecret              Opaque                                2      50s

第一种：使用secret中的变量导入到pod中

复制configmap.yaml和secret-simple.yaml

[root@localhost demo]# kubectl get secret mysecret -o yaml
apiVersion: v1
data:
  password: MWYyZDFlMmU2N2Rm
  username: YWRtaW4=
kind: Secret
metadata:
  creationTimestamp: 2020-02-19T03:54:50Z
  name: mysecret
  namespace: default
  resourceVersion: "973651"
  selfLink: /api/v1/namespaces/default/secrets/mysecret
  uid: 93d69e01-52cb-11ea-895a-000c297a15fb
type: Opaque

//key: username赋值给SECRET_USERNAME
//key: password 赋值给SECRET_PASSWORD
[root@localhost demo]# vim 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

[root@localhost demo]# kubectl apply -f secret-var.yaml 
pod/mypod created
[root@localhost demo]# kubectl get pods
NAME                     READY   STATUS      RESTARTS   AGE
mypod                    1/1     Running     0          38s
[root@localhost demo]# kubectl exec -it mypod bash
root@mypod:/# echo $SECRET_USERNAME
admin
root@mypod:/# echo $SECRET_PASSWORD
1f2d1e2e67df

第二种：以volume的形式挂载到pod的某个目录下

[root@localhost demo]# vim 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: db-user-pass

[root@localhost demo]# kubectl delete -f secret-var.yaml 
pod "mypod" deleted
[root@localhost demo]# kubectl create -f secret-vol.yaml
pod/mypod created
[root@localhost demo]# kubectl get pods
NAME                     READY   STATUS      RESTARTS   AGE
mypod                    1/1     Running     0          94s
//容器看见里面的文件被挂载
[root@localhost demo]# kubectl exec -it mypod bash
root@mypod:/# ls /etc/foo
password  username
root@mypod:/# cd /etc/foo
root@mypod:/etc/foo# cat password 
1f2d1e2e67df
root@mypod:/etc/foo# cat username 
admin

二、ConfigMap

与Secret类似，区别在于ConfigMap保存的是不需要加密配置的信息
应用场景：应用配置

创建方式一：kubectl

[root@localhost demo]# vim redis.properties
redis.host=127.0.0.1
redis.port=6379
redis.password=123456
//创建configmap资源
[root@localhost demo]# kubectl create configmap redis-config --from-file=redis.properties
configmap/redis-config created
//查看资源
[root@localhost demo]# kubectl get configmap
NAME           DATA   AGE
redis-config   1      32s
//也可以用缩写查看
[root@localhost demo]# kubectl get cm
NAME           DATA   AGE
redis-config   1      78s
[root@localhost demo]# kubectl describe cm redis-config
Name:         redis-config
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
redis.properties:
----
redis.host=127.0.0.1
redis.port=6379
redis.password=123456

Events:  <none>












//创建mypod资源查看文件导入
[root@localhost demo]# vim 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
//删除掉之前创建重名的mypod
[root@localhost demo]# kubectl delete pod mypod
pod "mypod" deleted
[root@localhost demo]# kubectl apply -f cm.yaml 
pod/mypod created
[root@localhost demo]# kubectl get pods
NAME                     READY   STATUS      RESTARTS   AGE
mypod                    0/1     Completed   0          7m59s
//查看里面的配置信息
[root@localhost demo]# kubectl logs mypod
redis.host=127.0.0.1
redis.port=6379
redis.password=123456

第二种变量参数形式

//创建configmap资源
[root@localhost demo]# vim myconfig.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: myconfig
  namespace: default
data:
  special.level: info
  special.type: hello

[root@localhost demo]# kubectl apply -f myconfig.yaml 
configmap/myconfig created
//创建mypod使用configmap资源输出变量参数
[root@localhost demo]# vim 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

//清除已有的mypod资源
[root@localhost demo]# kubectl delete pod mypod
pod "mypod" deleted
//创建mypod资源
[root@localhost demo]# kubectl apply -f config-var.yaml 
pod/mypod created
//查看变量的输出
[root@localhost demo]# kubectl logs mypod
info hello

标签：kubectl,name,demo,配置管理,mypod,K8S,root,localhost
来源： https://blog.csdn.net/Gengchenchen/article/details/117197203

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