单独启动和关闭hadoop服务
1）启动名称节点Hadoop-daemon.sh start namenode
2) 启动数据节点
hadoop-daemons.sh start datanodeslave
3）hadoop-daemon.sh start secondarynamenode
4）查看端口50070
netstat -anop | grep 500
5）开启resourcemanager
yarn-daemon.sh start resourcemanager
6）开启nodemanager
bin/yarn-daemons.sh start nodemanager
停止一个数据节点
hadoop-daemon.sh stop datanode
重新开启
hadoop-daemon.sh start datanode
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