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。
1 [root@master sbin]# ./start-all.sh 2 This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh 3 Starting namenodes on [master] 4 The authenticity of host 'master (10.0.0.110)' can't be established. 5 RSA key fingerprint is 90:b6:9e:d0:3e:76:27:ce:34:3b:d6:b4:41:5d:e7:31. 6 Are you sure you want to continue connecting (yes/no)? yes 7 master: Warning: Permanently added 'master,10.0.0.110' (RSA) to the list of known hosts. 8 master: starting namenode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-namenode-master.out 9 slaver1: starting datanode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-datanode-slaver1.out 10 slaver2: starting datanode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-datanode-slaver2.out 11 master: starting datanode, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/hadoop-root-datanode-master.out 12 starting yarn daemons 13 starting resourcemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-resourcemanager-master.out 14 slaver2: starting nodemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-nodemanager-slaver2.out 15 slaver1: starting nodemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-nodemanager-slaver1.out 16 master: starting nodemanager, logging to /opt/hadoop_resources/hadoop-2.7.0/logs/yarn-root-nodemanager-master.out 17 [root@master sbin]# jps 18 1926 ResourceManager 19 1597 NameNode 20 2020 NodeManager 21 2054 Jps 22 1688 DataNode