Ubuntu14.04下安裝Hadoop2.６.0&nb…

創建hadoop用戶 ：
sudo adduser -ingroup hadoop hadoop

爲hadoop用戶添加權限：
sudo gedit /etc/sudoers
　　root    ALL=(ALL:ALL) ALL下添加：
　　hadoop    ALL=(ALL:ALL) ALL

安裝ssh：
sudo apt-get install ssh
sudo apt-get install rsync
或sudo apt-get install openssh-server
啓動　sudo /etc/init.d/ssh start
設置免密碼登錄，生成私鑰和公鑰　ssh-keygen -t rsa -P ""
登錄　ssh localhost　退出exit

查看JDK路徑：
update-alternatives - -config java

hadoop安裝配置
移至　sudo mv hadoop-2.６.0 /usr/local/hadoop
權限　sudo chmod 774 /usr/local/hadoop
配置.bashrc文件　sudo gedit ~/.bashrc　末尾添加
　　#HADOOP VARIABLES START
　　export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
　　export HADOOP_INSTALL=/usr/local/hadoop
　　export PATH=$PATH:$HADOOP_INSTALL/bin
　　export PATH=$PATH:$HADOOP_INSTALL/sbin
　　export HADOOP_MAPRED_HOME=$HADOOP_INSTALL
　　export HADOOP_COMMON_HOME=$HADOOP_INSTALL
　　export HADOOP_HDFS_HOME=$HADOOP_INSTALL
　　export YARN_HOME=$HADOOP_INSTALL
　　export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_INSTALL/lib/native
　　export HADOOP_OPTS="-Djava.library.path=$HADOOP_INSTALL/lib"
　　#HADOOP VARIABLES END　　
配置生效　source ~/.bashrc
配置hadoop-env.sh文件　sudo gedit /usr/local/hadoop/etc/hadoop/hadoop-env.sh
　　修改　export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64

安裝完成，測試：
/usr/local/hadoop下mkdir input

cp README.txt input

bin/hadoop jar share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.4.0-sources.jar org.apache.hadoop.examples.WordCount input output

cat output/*　查看字符統計結果......