今天在启动Hadoop时遇到Name or service not knownstname这样的错误
1 : Name or service not knownstname master
2 : Name or service not knownstname slaver1
3 : Name or service not knownstname slaver2
原因：slaves文件可能被污染了。
解决方法：删除掉slaves文件，重新建立一个slaves文件，并配置好就可以了。
[root@master sbin]# ./start-all.sh
This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
Starting namenodes on [master]
The authenticity of host 'master (10.0.0.110)' can't be established.
RSA key fingerprint is 90:b6:9e:d0:3e:76:27:ce:34:3b:d6:b4:41:5d:e7:31.
Are you sure you want to continue connecting (yes/no)? yes
master: Warning: Permanently added 'master,10.0.0.110' (RSA) to the list of known hosts.
master: starting namenode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-namenode-master.out
slaver1: starting datanode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-datanode-slaver1.out
slaver2: starting datanode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-datanode-slaver2.out
master: starting datanode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-datanode-master.out
starting yarn daemons
starting resourcemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-resourcemanager-master.out
slaver2: starting nodemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-nodemanager-slaver2.out
slaver1: starting nodemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-nodemanager-slaver1.out
master: starting nodemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-nodemanager-master.out
[root@master sbin]# jps
1926 ResourceManager
1597 NameNode
2020 NodeManager
2054 Jps
1688 DataNode
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