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50070页面打不开
用jps命令查看发现namenode没有启动
解决办法：删掉master和slave虚拟机的hadoop.tmp.dir，dfs.name.dir，dfs.data.dir配置的目录，重新用hadoop namenode -format 格式化，再start-all.sh
成功 -
在终端输入
hadoop dfsadmin -report,结果如下：
[root@master hadoop]# hdfs dfsadmin -report
Configured Capacity: 0 (0 B)
Present Capacity: 0 (0 B)
DFS Remaining: 0 (0 B)
DFS Used: 0 (0 B)
DFS Used%: NaN%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
hadoop dfsadmin -safemode leave
方法一：关掉防火墙systemctl stop firewalld.service
失败
方法二：离开安全模式
hadoop dfsadmin -safemode leave
失败
最后按照解决50070页面打不开的方法，成功解决
[root@master hadoop_opt]# hadoop dfsadmin
-report
DEPRECATED: Use of this script to execute
hdfs command is deprecated.
Instead use the hdfs command for it.
Configured Capacity: 36477861888 (33.97 GB)
Present Capacity: 25981939712 (24.20 GB)
DFS Remaining: 25981931520 (24.20 GB)
DFS Used: 8192 (8 KB)
DFS Used%: 0.00%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
-------------------------------------------------
看博客说，没有正确退出hadoop容易造成好多问题。
以后记住要用stop-all.sh把所有进程关掉。
防火墙命令：
- 查看防火墙状态
firewall-cmd --state
- 开启服务
systemctl start firewalld.service
- 关闭服务
systemctl stop firewalld.service
- 开机自启
systemctl enable firewalld.service
- 关闭开机自启
systemctl disable firewalld.service