问题一：出现Attempting to operate on hdfs namenode as root
写在最前注意：
1、master，slave都需要修改start-dfs.sh，stop-dfs.sh，start-yarn.sh，stop-yarn.sh四个文件
2、如果你的Hadoop是另外启用其它用户来启动，记得将root改为对应用户
HDFS格式化后启动dfs出现以下错误：
[root@master sbin]# ./start-dfs.sh
Starting namenodes on [master]
ERROR: Attempting to operate on hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
Starting datanodes
ERROR: Attempting to operate on hdfs datanode as root
ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
Starting secondary namenodes [slave1]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
查度娘，见一仁兄的博客有次FAQ，故参考处理顺便再做一记录
参考地址：https://blog.csdn.net/u013725455/article/details/70147331
在/hadoop/sbin路径下：
将start-dfs.sh，stop-dfs.sh两个文件顶部添加以下参数
HDFS_DATANODE_USER=root
HDFS_DATANODE_SECURE_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
还有，start-yarn.sh，stop-yarn.sh顶部也需添加以下：
#!/usr/bin/env bash
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root # Licensed to the Apache Software Foundation (ASF) under one or more
修改后重启 ./start-dfs.sh，成功！
[root@master sbin]# ./start-dfs.sh
WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER.
Starting namenodes on [master]
上一次登录：日 6月 3 03:01:37 CST 2018从 slave1pts/2 上
master: Warning: Permanently added 'master,192.168.43.161' (ECDSA) to the list of known hosts.
Starting datanodes
上一次登录：日 6月 3 04:09:05 CST 2018pts/1 上
Starting secondary namenodes [slave1]
上一次登录：日 6月 3 04:09:08 CST 2018pts/1 上
from: https://blog.csdn.net/lglglgl/article/details/80553828
问题二：正常启动后jps查看无namenode,datanode
解决方法：
1.先查看是不是的防火墙开启，将防火墙关闭：service iptbales stop
2.查看端口状态：telnet 192.168.86.10 9000（192.168.86.10是我自己的静态ip）
如果出现不能连接，那么我们需要修改我们的hosts
3.修改hosts：vi /etc/hosts
将127：0：0：1 localhost localhost.localdomain localhost4 localhost4.localdomain4
改为 ：：1 localhost localhost.localdomain localhost4 localhost4.localdomain4
或者将127：0：0：1 localhost localhost.localdomain localhost4 localhost4.localdomain4 删除
在下方写入 192.168.86.10 mini1 localhost (192.168.86.10是我自己的静态ip mini1是我的主机名)
4.重新启动network：service network restart或sudo /etc/init.d/networking restart
from: https://blog.csdn.net/u010599953/article/details/75635058