使用jps命令后缺少DataNode和TaskTracker进程

root@mathon-Y430P:/opt/hadoop-1.2.1/bin# start-all.sh 
Warning: $HADOOP_HOME is deprecated.

starting namenode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-namenode-mathon-Y430P.out
root@localhost's password: 
localhost: starting datanode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-datanode-mathon-Y430P.out
root@localhost's password: 
localhost: starting secondarynamenode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-secondarynamenode-mathon-Y430P.out
starting jobtracker, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-jobtracker-mathon-Y430P.out
root@localhost's password: 
localhost: starting tasktracker, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-tasktracker-mathon-Y430P.out
root@mathon-Y430P:/opt/hadoop-1.2.1/bin# jps
16119 Jps
15449 NameNode
15878 JobTracker
15787 SecondaryNameNode
root@mathon-Y430P:/opt/hadoop-1.2.1/bin#

后来我看了日志文件，貌似是ssh没有配置好，我当时直接安装了ssh，没有配置，我也不知道域名服务器是啥，请问大神怎么配置，谢谢了，下面是日志信息

2016-04-05 10:43:08,767 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = java.net.UnknownHostException: mathon-Y430P: mathon-Y430P: 未知的名称或服务
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 1.2.1
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG:   java = 1.7.0_95
************************************************************/
2016-04-05 10:43:08,892 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2016-04-05 10:43:08,900 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
2016-04-05 10:43:08,906 ERROR org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Error getting localhost name. Using 'localhost'...
java.net.UnknownHostException: mathon-Y430P: mathon-Y430P: 未知的名称或服务
	at java.net.InetAddress.getLocalHost(InetAddress.java:1496)
	at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.getHostname(MetricsSystemImpl.java:481)
	at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.configureSystem(MetricsSystemImpl.java:412)
	at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.configure(MetricsSystemImpl.java:408)
	at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.start(MetricsSystemImpl.java:152)
	at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.init(MetricsSystemImpl.java:133)
	at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.init(DefaultMetricsSystem.java:40)
	at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.initialize(DefaultMetricsSystem.java:50)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1650)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1669)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1795)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1812)
Caused by: java.net.UnknownHostException: mathon-Y430P: 未知的名称或服务
	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
	at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:922)
	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1316)
	at java.net.InetAddress.getLocalHost(InetAddress.java:1492)
	... 11 more

Mathon

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使用jps命令后缺少DataNode和TaskTracker进程

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