这篇文章主要介绍VM9+Debian6+hadoop0.23.9如何实现单点安装，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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一、环境准备
1.1 Debian 6，安装时根据提示安装SSH；（如果是window中模拟，可先安装VMware，本人选择的是VMware workstation 9）
1.2 jdk1.7，hadoop0.23.9：下载位置http://mirror.esocc.com/apache/hadoop/common/hadoop-0.23.9/hadoop-0.23.9.tar.gz
二、安装过程
2.1 为Debian安装sudo
root@debian:apt-get install sudo
2.2 安装jdk1.7
先通过SSH客户端将jdk-7u45-linux-i586.tar.gz传到/root/路径下，然后执行下面命令
root@debian~:tar -zxvf jdk-7u45-linux-i586.tar.gz -C /usr/java/
2.3 hadoop下载&安装
root@debian~:wget http://mirror.esocc.com/apache/hadoop/common/hadoop-0.23.9/hadoop-0.23.9.tar.gz root@debian~:tar zxvf hadoop-0.23.9.tar.gz -C /opt/ root@debian~:cd /opt/ root@debian:/opt/# ln -s hadoop-0.23.9/ hadoop
----------这里做了个hadoop0.23.9的映射，相当于windows下面的.link
2.4 添加hadoop用户权限
root@debian~:groupadd hadoop root@debian~:useradd -g hadoop hadoop root@debian~:passwd hadoop root@debian~:vi /etc/sudoers
sudoers中添加hadoop用户权限
root ALL=(ALL) ALL下方添加
hadoop ALL=(ALL:ALL) ALL
2.5 配置SSH登录
root@debian:su – hadoop root@debian:ssh-keygen -t rsa -P "自己的密码" 可以是无密码 root@debian:cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys root@debian:chmod 600 ~/.ssh/authorized_keys
测试登录
root@debian:ssh localhost
如果想设置空密码登录，还是提示输入密码的话，确认本机sshd的配置文件(需要root权限)
root @debian :vi /etc/ssh/sshd_config
找到以下内容，并去掉注释符”#“
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
然后重启sshd，不想设置空密码登录的不用重启
root @debian :servicesshd restart
2.6 配置hadoop用户
root@debian:chown -R hadoop:hadoop /opt/hadoop root@debian:chown -R hadoop:hadoop /opt/hadoop-0.23.9 root@debian:su – hadoop hadoop@debian6-01:~#:vi .bashrc
添加以下部分
export JAVA_HOME=/usr/java//usr/java/jdk1.7.0_45
export JRE_HOME=${JAVA_HOME}/jre
export HADOOP_HOME=/opt/hadoop
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$HADOOP_HOME/bin:$PATH
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
export YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop
root@debian:cd /opt/hadoop/etc/hadoop/ root@debian6-01:/opt/hadoop/etc/hadoop# vi yarn-env.sh
追加以下
export HADOOP_FREFIX=/opt/hadoop
export HADOOP_COMMON_HOME=${HADOOP_FREFIX}
export HADOOP_HDFS_HOME=${HADOOP_FREFIX}
export PATH=$PATH:$HADOOP_FREFIX/bin
export PATH=$PATH:$HADOOP_FREFIX/sbin
export HADOOP_MAPRED_HOME=${HADOOP_FREFIX}
export YARN_HOME=${HADOOP_FREFIX}
export HADOOP_CONF_HOME=${HADOOP_FREFIX}/etc/hadoop
export YARN_CONF_DIR=${HADOOP_FREFIX}/etc/hadoop
root@debian6-01:/opt/hadoop/etc/hadoop# vi core-site.xml
root@debian6-01:/opt/hadoop/etc/hadoop# vi hdfs-site.xml
root@debian6-01:/opt/hadoop/etc/hadoop#cp mapred-site.xml.templatemapred-site.xml root@debian6-01:/opt/hadoop/etc/hadoop# vi mapred-site.xml
root@debian6-01:/opt/hadoop/etc/hadoop# vi yarn-site.xml
2.7 启动并运行wordcount程序
设置JAVA_HOME
root@debian6-01:vi /opt/hadoop/libexec/hadoop-config.sh
# Attempt to set JAVA_HOME if it is not set
export JAVA_HOME=/usr/java/jdk1.7.0_45 -添加
if [[ -z $JAVA_HOME ]]; then -------:wq!保存退出
格式化namenode
root@debian6-01:/opt/hadoop/lib# hadoop namenode -format
启动
root@debian6-01:/opt/hadoop/sbin/start-dfs.sh root@debian6-01:/opt/hadoop/sbin/start-yarn.sh
检查
root@debian6-01:jps
6365 SecondaryNameNode
7196 ResourceManager
6066 NameNode
7613 Jps
6188 DataNode
7311 NodeManager
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