###创建ConfigMap###

cat configmap-tomcat-server.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: tomcat-server-config
data:
  server.xml: |
    <?xml version=‘1.0‘ encoding=‘utf-8‘?>
      <Server port="8005" shutdown="SHUTDOWN">
      <Listener className="org.apache.catalina.startup.VersionLoggerListener" />
      <!--APR library loader. Documentation at /docs/apr.html -->
      <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
      <!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
      <Listener className="org.apache.catalina.core.JasperListener" />
      <!-- Prevent memory leaks due to use of particular java/javax APIs-->
      <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
      <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
      <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
      <GlobalNamingResources>
        <Resource name="UserDatabase" auth="Container"
                  type="org.apache.catalina.UserDatabase"
                  description="User database that can be updated and saved"
                  factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
                  pathname="conf/tomcat-users.xml" />
      </GlobalNamingResources>
      <Service name="Catalina">
        <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
            maxThreads="500" minSpareThreads="50" prestartminSpareThreads="true" />
        <Connector executor="tomcatThreadPool" port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
                   connectionTimeout="20000"
                   redirectPort="8443"
                   enableLookups="false"
                   maxPostSize="10485760"
                   URIEncoding="UTF-8"
                   disableUploadTimeout="true"
                   maxConnections="10000"
                   SSLEnabled="false"/>
        <Engine name="Catalina" defaultHost="localhost">
          <Realm className="org.apache.catalina.realm.LockOutRealm">
            <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
                   resourceName="UserDatabase"/>
          </Realm>
          <Host name="localhost"  appBase="webapps"
                unpackWARs="true" autoDeploy="true">
            <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
                   prefix="localhost_access_log." suffix=".txt"
                   pattern="%h %l %u %t &quot;%r&quot; %s %b" />
          </Host>
          <Context path="" docBase="/tomcat/webapps" debug="0" reloadable="true" crossContext="true"/>
        </Engine>
       </Service>
     </Server>


查看
[root@master configmap]# kubectl get configmaps tomcat-server-config
NAME                   DATA      AGE
tomcat-server-config   1         13s

查看详细信息
[root@master configmap]# kubectl describe configmaps tomcat-server-config
Name:         tomcat-server-config
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
server.xml:
----
<?xml version=‘1.0‘ encoding=‘utf-8‘?>
  <Server port="8005" shutdown="SHUTDOWN">
  <Listener 
.....

cat test.yaml

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: abcdocker-pod
spec:
  replicas: 1
  selector:
    matchLabels:
      app: tomcat
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - image: busybox
        imagePullPolicy: IfNotPresent
        name: tomcatpod
        volumeMounts:
        - mountPath: /tmp/server.xml
          name: serverxml
          subPath: server.xml
        ports:
        - containerPort: 8080
        command: ["tail", "-f", "/dev/null"]
      volumes:
      - name: serverxml
        configMap:
          name: tomcat-server-config
          items:
          - key: server.xml
            path: server.xml

kubectl create -f test.yaml        
===================参数解释===============
        volumeMounts:
        - mountPath: /tmp/server.xml  ##挂在到容器内的目录
          name: serverxml     #挂载名称(需要和volume的名称对应上)
          subPath: server.xml   #不加subPath会替换整个目录
        ports:
        - containerPort: 8080
        command: ["tail", "-f", "/dev/null"]
      volumes:
      - name: serverxml         #volumemount名称
        configMap:
          name: tomcat-server-config   #创建的configmap名称
          items:
          - key: server.xml     #对应的key
            path: server.xml    #挂载到目录的key名称
####################################

需要注意的是，不可以光mount挂载，需要执行命令让容器在前台运行！