我是docker的新手，尝试在ubuntu服务器上使用docker配置单节点hadoop。这是我已经做过的。

$ docker pull sequenceiq/hadoop-docker:2.7.1
 ......
$ docker run -it sequenceiq/hadoop-docker:2.7.1 /etc/bootstrap.sh -bash
Starting sshd:                                             [  OK  ]
18/06/27 12:59:00 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting namenodes on [cb46e163e0be]
cb46e163e0be: starting namenode, logging to /usr/local/hadoop/logs/hadoop-root-namenode-cb46e163e0be.out
localhost: starting datanode, logging to /usr/local/hadoop/logs/hadoop-root-datanode-cb46e163e0be.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-root-secondarynamenode-cb46e163e0be.out
18/06/27 12:59:26 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
starting yarn daemons
starting resourcemanager, logging to /usr/local/hadoop/logs/yarn--resourcemanager-cb46e163e0be.out
localhost: starting nodemanager, logging to /usr/local/hadoop/logs/yarn-root-nodemanager-cb46e163e0be.out
bash-4.1# jps
532 ResourceManager
204 DataNode
118 NameNode
371 SecondaryNameNode
918 Jps
620 NodeManager
``` `jps` 显示资源管理器正在运行。现在我试着测试hadoop

bash-4.1# cd $HADOOP_PREFIX
bash-4.1# bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.1.jar grep input output 'dfs[a-z.]+'
18/06/27 13:02:23 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
18/06/27 13:02:25 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
18/06/27 13:02:27 INFO input.FileInputFormat: Total input paths to process : 31
18/06/27 13:02:27 INFO mapreduce.JobSubmitter: number of splits:31
18/06/27 13:02:28 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1530118774059_0001
18/06/27 13:02:28 INFO impl.YarnClientImpl: Submitted application application_1530118774059_0001
18/06/27 13:02:28 INFO mapreduce.Job: The url to track the job: http://cb46e163e0be:8088/proxy/application_1530118774059_0001/
18/06/27 13:02:28 INFO mapreduce.Job: Running job: job_1530118774059_0001
18/06/27 13:02:44 INFO mapreduce.Job: Job job_1530118774059_0001 running in uber mode : false
18/06/27 13:02:44 INFO mapreduce.Job: map 0% reduce 0%
18/06/27 13:05:56 INFO ipc.Client: Retrying connect to server: cb46e163e0be/172.17.0.2:42698. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=3, sleepTime=1000 MILLISECONDS)
18/06/27 13:05:57 INFO ipc.Client: Retrying connect to server: cb46e163e0be/172.17.0.2:42698. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=3, sleepTime=1000 MILLISECONDS)
18/06/27 13:05:58 INFO ipc.Client: Retrying connect to server: cb46e163e0be/172.17.0.2:42698. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=3, sleepTime=1000 MILLISECONDS)
18/06/27 13:05:59 INFO ipc.Client: Retrying connect to server: cb46e163e0be/172.17.0.2:42698. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=3, sleepTime=1000 MILLISECONDS)
18/06/27 13:06:00 INFO ipc.Client: Retrying connect to server: cb46e163e0be/172.17.0.2:42698. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=3, sleepTime=1000 MILLISECONDS)
18/06/27 13:06:01 INFO ipc.Client: Retrying connect to server: cb46e163e0be/172.17.0.2:42698. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=3, sleepTime=1000 MILLISECONDS)
^C
bash-4.1# jps
532 ResourceManager
204 DataNode
1671 Jps
371 SecondaryNameNode

bash-4.1#

现在我不明白两件事。
这是hadoop的官方形象，为什么它不能正确运行呢？我犯了什么错误吗？如果是，那是什么？
当我这么做的时候 `jps` 在运行示例代码之前，您可以看到 `node manager` 以及 `name node` 由…归还 `jps` . 但是在运行这个例子并退出这个例子之后，这两个对象并没有被返回 `jps` . 为什么会这样？
请帮忙。谢谢