參考：

https://blog.csdn.net/pucao_cug/article/details/71698903

設置免密登陸後，必須重啟ssh服務

systermctl restart sshd.service

ssh服務介紹：

兩種登陸方式：

1.密碼登陸

2.密鑰登陸

啟動

http://192.168.5.130:8088/cluster

http://192.168.5.130:50070/dfshealth.html#tab-overview

安裝Hadoop家族工具

hive 結合 mysql的jdbc插件 https://blog.csdn.net/pucao_cug/article/details/71773665

impala

sqoop https://blog.csdn.net/pucao_cug/article/details/72083172

hbase https://blog.csdn.net/pucao_cug/article/details/72229223

啟動會報錯

https://blog.csdn.net/l1028386804/article/details/51538611

centos7配置Hadoop集群環境