start-dfs.sh 启动成功 datanode未启动

在namenode中启动报错

test2: Exception in thread "main" java.net.UnknownHostException: unknown host: test1

到test2中日志查看报错信息

ERROR security.UserGroupInformation: PriviledgedActionException as:hadoop cause:java.net.UnknownHostException: hadoop: hadoop: Name or service not known
Exception in thread "main" java.net.UnknownHostException: hadoop: hadoop: Name or service not known

这是因为在test2中未做对test1主机名称的映射

在/etc/hosts中添加对test1映射

test1 ip地址   test1