一年多前简单研究过hadoop，环境centos 6.5 64bit.使用下面的命令逐步助兴即可初始化，留着自己用的。

cd /optwget http://mirrors.cnnic.cn/apache/hadoop/common/hadoop-2.6.4/hadoop-2.6.4.tar.gztar -xvf hadoop-2.6.4.tar.gz ln -s hadoop-2.6.4 hadoopcp ./etc/hadoop/* inputbin/hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.4.jar grep input output 'dfs[a-z.]+' cat output/*rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpmyum install nginxservice nginx startiptables -I INPUT -p tcp --dport 80 -j ACCEPTservice iptables saveservice iptables restartservice iptables statushttp://10.132.65.77/hadoop-project-dist/hadoop-common/SingleCluster.htmlssh-keygen -t dsa -P '' -f ~/.ssh/id_dsaiptables -I INPUT -p tcp --dport 50070 -j ACCEPTbin/hdfs dfs -put etc/hadoop /userbin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.4.jar grep /user output 'dfs[a-z.]+'bin/hdfs dfs -get output outputbin/hdfs dfs -cat output/* -- this is not workingiptables -I INPUT -p tcp --dport 8088 -j ACCEPTiptables -I INPUT -p tcp --dport 9000 -j ACCEPTiptables -I INPUT -p tcp --dport 50090 -j ACCEPTiptables -I INPUT -p tcp --dport 50070 -j ACCEPTiptables -I INPUT -p tcp --dport 50010 -j ACCEPTiptables -I INPUT -p tcp --dport 50075 -j ACCEPTiptables -I INPUT -p tcp --dport 50020 -j ACCEPTiptables -I INPUT -p tcp --dport 8040 -j ACCEPTiptables -I INPUT -p tcp --dport 8042 -j ACCEPTiptables -I INPUT -p tcp --dport 8088 -j ACCEPTiptables -I INPUT -p tcp --dport 8030 -j ACCEPTiptables -I INPUT -p tcp --dport 8031 -j ACCEPTiptables -I INPUT -p tcp --dport 8032 -j ACCEPTiptables -I INPUT -p tcp --dport 8033 -j ACCEPT bin/hdfs namenode -formatjavac -classpath ${HADOOP_HOME}/hadoop-${HADOOP_VERSION}-core.jar -d wordcount_classes WordCount.java