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1、作用

• 存储不加密的数据到etcd中，以变量或者volume形式挂载到pod的容器中
• 场景：配置文件

2、以volume形式进行挂载

2.1 创建配置文件

[root@master k8sconfigmap]# vim redis.properties
[root@master k8sconfigmap]# cat redis.properties 
redis.host=127.0.0.1
redis.port=6379
redis.password=123456

2.2 创建ConfigMap文件

[root@master k8sconfigmap]# kubectl create configmap redis-config --from-file=redis.properties 
configmap/redis-config created
[root@master k8sconfigmap]# kubectl get cm   #查看cm信息
NAME               DATA   AGE
kube-root-ca.crt   1      62d
redis-config       1      8s
[root@master k8sconfigmap]# 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=123456Events:  <none>

2.3 最终的yaml文件

[root@master k8sconfigmap]# vim cm.yaml
[root@master k8sconfigmap]# cat cm.yaml 
apiVersion: v1
kind: Pod
metadata:name: mypod
spec:containers:- name: busyboximage: busyboxcommand: ["/bin/sh","-c","cat /etc/config/redis.properties"]volumeMounts:- name: config-volumemountPath: /etc/configvolumes:- name: config-volumeconfigMap:name: redis-configrestartPolicy: Never
[root@master k8sconfigmap]# kubectl apply -f cm.yaml 
pod/mypod created
[root@master k8sconfigmap]# kubectl get pod
NAME    READY   STATUS      RESTARTS   AGE
mypod   0/1     Completed   0          7s
[root@master k8sconfigmap]# kubectl logs mypod   #查看效果
redis.host=127.0.0.1
redis.port=6379
redis.password=123456

3、以变量形式进行挂载

3.1 创建configmap文件

[root@master k8sconfigmap]# cat config.yaml    ##设置好变量
apiVersion: v1
kind: ConfigMap
metadata:name: myconfignamespace: default
data:special.level: infospecial.type: hello
[root@master k8sconfigmap]# kubectl get configmaps 
kube-root-ca.crt  myconfig          
[root@master k8sconfigmap]# kubectl get configmaps myconfig 
NAME       DATA   AGE
myconfig   2      37s
[root@master k8sconfigmap]# kubectl describe cm myconfig 
Name:         myconfig
Namespace:    default
Labels:       <none>
Annotations:  <none>Data
====
special.level:
----
info
special.type:
----
hello
Events:  <none>

3.2 书写最终yaml文件

[root@master k8sconfigmap]# cat config-var.yaml 
apiVersion: v1
kind: Pod
metadata:name: mypod
spec:containers:- name: busyboximage: busyboxcommand: [ "/bin/sh", "-c", "echo $(LEVEL) $(TYPE)" ]env:- name: LEVELvalueFrom:configMapKeyRef:name: myconfigkey: special.level- name: TYPEvalueFrom:configMapKeyRef:name: myconfigkey: special.typerestartPolicy: Never
[root@master k8sconfigmap]# kubectl get pods
NAME    READY   STATUS      RESTARTS   AGE
mypod   0/1     Completed   0          35s
[root@master k8sconfigmap]# kubectl logs mypod 
info hello