当前用户对hadoop安装目录无足够权限

1、首先将hadoop解压到 /opt

$sudo tar -zxvf hadoop.xx.xx.tar.gz
到达/opt下，然后建立hadoop文件夹，里面建立name和data两个文件夹
$sudo mkdir hadoop
到达/hadoop
$sudo mkdir name
$sudo mkdir data

2、配置hadoop

**core-size.xml**<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><!-- Put site-specific property overrides in this file. --><configuration><property><name>hadoop.tmp.dir</name><value>/opt/hadoop</value></property><property><name>dfs.name.dir</name><value>/opt/hadoop/name</value></property><property><name>fs.default.name</name><value>hdfs://localhost:9000</value></property></configuration>

hdfs-size.xml

<configuration><property><name>dfs.data.dir</name><value>/opt/hadoop/data</value></property><property><name>dfs.replication</name><value>1</value></property></configuration>

mapred-size.xml

<configuration><property><name>maperd.job.tracker</name><value>localhost:9001</value></property></configuration>

hadoop-env.sh

# The java implementation to use.  Required. **export JAVA_HOME=/usr/local/java/jdk1.7.0_67**# Extra Java CLASSPATH elements.  Optional.

打开/etc/profile

export JAVA_HOME=/usr/local/java/jdk1.7.0_67export HADOOP_HOME=/opt/hadoop-1.2.1export PATH=$JAVA_HOME/bin:$HADOOP_HOME/bin:$PATHexport CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

到这里配置Hadoop配置差不多没问题了。
$ hadoop （可以看到是否成功）
1、格式化HDFS 到达hadoop的bin目录下 执行
$hadoop namenode -format
这里我直接报了这个错 （namenode 无法启动）
ERROR namenode.NameNode: Java.io.IOException: Cannot create directory /export/home/dfs/name/current

解决：原因是 没有设置 /opt/hadoop 的权限没有设置， 将之改为：
$ chown –R hadoop:hadoop /opt/hadoop
$ sudo chmod -R a+w /opt/hadoop

2、启动Hadoop

执行 start-all.sh
当前用户对hadoop安装目录无足够权限
hm@hm-ubuntu:/usr/hadoop-1.1.2/bin$ start-all.sh
mkdir: cannot create directory /usr/hadoop-1.1.2/libexec/../logs': Permission denied
chown: cannot access/usr/hadoop-1.1.2/libexec/../logs’: No such file or directory

starting namenode, logging to /usr/hadoop-1.1.2/libexec/../logs/hadoop-hm-namenode-hm-ubuntu.out
/usr/hadoop-1.1.2/bin/hadoop-daemon.sh: line 136: /usr/hadoop-1.1.2/libexec/../logs/hadoop-hm-namenode-hm-ubuntu.out: No such file or directory
head: cannot open `/usr/hadoop-1.1.2/libexec/../logs/hadoop-hm-namenode-hm-ubuntu.out’ for reading: No such file or directory
hm@localhost’s password:
… …
解决：
执行 chown 命令为当前用户赋予对目录可写的权限
sudo chown -hR Eddie（当前用户名） hadoop-xxx(当前版本)