Access denied for user root. Superuser privilege is required

在使用 cloudera manager 安裝  hdfs 的過程中，報錯 using /usr/java/jdk1.7.0_67/ as JAVA_HOME using 5 as CDH_VERSION using /opt/cm-5.7.0/run/cloudera-scm-agent/process/25-hdfs-NAMENODE-createtmp as CONF_DIR using as SECURE_USER using as SECURE_GROUP unlimited Directory /tmp does not currently exist. Unable to create directory /tmp; see stderr log.

 

查看agent日誌發現  Access denied for user root. Superuser privilege is required

 

此時你需要離開hdfs的安全模式 

 

解決辦法1.
ps -ef 

看一下運行hdfs的用戶是誰，再切到該用戶下

 

root     11980 11954  0 14:27 ?       00:00:23 python2.6 /opt/cm-5.7.0/lib64/cmf/agent/build/env/bin/flood

postfix  12065  1078  0 14:29 ?       00:00:00 pickup -l -t fifo -u

root     14740     1  0 14:55 ?       00:00:00 sshd: root@pts/0 

root     14765 14740  0 14:55 pts/0   00:00:00 -bash

root     15158     1  0 14:58 ?       00:00:00 /usr/sbin/sshd

hdfs    16493 11954  2 15:19 ?       00:00:29 /usr/java/jdk1.7.0_67//bin/java -Dproc_namenode -Xmx1000m -Dhdfs.audit.logg

hdfs    16523 11954  1 15:19 ?       00:00:14 /usr/java/jdk1.7.0_67//bin/java -Dproc_secondarynamenode -Xmx1000m -Dhdfs.a

root     19304  8259  1 15:43 pts/1    00:00:00 ps -ef

 

su - hdfs

再運行就ok了
hdfs dfsadmin -safemode leave
解決辦法2
到服務器上修改hadoop的配置文件：conf/hdfs-core.xml, 找到 dfs.permissions 的配置項 , 將value值改爲 false
在conf/hdfs-site.xml中加入

dfs.permissions
false


解決辦法3
clouder manager 在web上操作流程：
 1）增加角色：HDFS->配置->檢查HDFS 權限dfs.permissions這項不要打勾->保存更改->重啓hdfs  
之後就可以用root用戶