CentOS 6.5 伪分布式 安装 hadoop 2.6.0

安装 jdk

1 yum install java-1.7.0-openjdk*
3 检查安装：java -version

创建Hadoop用户，设置Hadoop用户使之可以免密码ssh到localhost

1 su - hadoop
2 ssh-keygen -t dsa -P ‘‘ -f ~/.ssh/id_dsa
3 cat ~/.ssh/id_dsa.pub>> ~/.ssh/authorized_keys
4
5 cd /home/hadoop/.ssh
6 chmod 600 authorized_keys  

注意这里的权限问题，保证.ssh目录权限为700，authorized_keys为600

验证：

1 [[email protected] .ssh]$ ssh localhost
2 Last login: Sun Nov 17 22:11:55 2013  

解压hadoop，安装在/opt/hadoop

1 tar -xzvf hadoop-2.6.0.tar.gz
2 mv -i /home/erik/hadoop-2.6.0 /opt/hadoop
3 chown -R hadoop /opt/hadoop  

要修改的文件有hadoop-env.sh、core-site.xml  、 hdfs-site.xml 、 yarn-site.xml 、mapred-site.xml几个文件。

1 cd /usr/opt/hadoop/etc/hadoop  

设置hadoop-env.sh中的java环境变量,改成这样JAVA_HOME好像没效

1 export JAVA_HOME= {你的java环境变量} 

core-site.xml

 1 <configuration>
 2     <property>
 3         <name>hadoop.tmp.dir</name>
 4         <value>/opt/hadoop/tmp</value>
 5     </property>
 6     <property>
 7         <name>fs.default.name</name>
 8         <value>localhost:9000</value>
 9     </property>
10 </configuration> 

hdfs.xml

 1 <configuration>
 2 <property>
 3         <name>dfs.replication</name>
 4         <value>1</value>
 5     </property>
 6     <property>
 7         <name>dfs.namenode.name.dir</name>
 8         <value>/opt/hadoop/dfs/name</value>
 9     </property>
10     <property>
11         <name>dfs.datanode.data.dir</name>
12         <value>/opt/hadoop/dfs/data</value>
13     </property>
14     <property>
15             <name>dfs.permissions</name>
16             <value>false</value>
17      </property>
18  </configuration>    

yarn-site.xml

 1 <configuration>
 2 <property>
 3 <name>mapreduce.framework.name</name>
 4 <value>yarn</value>
 5 </property>
 6
 7 <property>
 8 <name>yarn.nodemanager.aux-services</name>
 9 <value>mapreduce_shuffle</value>
10 </property>
11 </configuration>

mapred-site.xml

1 <configuration>
2 <property>
3 <name>mapred.job.tracker</name>
4 <value>localhost:9001</value>
5 </property>
6 </configuration>

配置环境变量，修改/etc/profile, 写在最后面即可。配置完要重启！！！

 1 export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.95.x86_64
 2 export JRE_HOME=$JAVA_HOME/jre
 3 export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/bin
 4 export HADOOP_INSTALL=/opt/hadoop
 5 export PATH=${HADOOP_INSTALL}/bin:${HADOOP_INSTALL}/sbin${PATH}
 6 export HADOOP_MAPRED_HOME=${HADOOP_INSTALL}
 7 export HADOOP_COMMON_HOME=${HADOOP_INSTALL}
 8 export HADOOP_HDFS_HOME=${HADOOP_INSTALL}
 9 export YARN_HOME=${HADOOP_INSTALLL}
10 export HADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_INSTALL}/lib/natvie
11 export HADOOP_OPTS="-Djava.library.path=${HADOOP_INSTALL}/lib:${HADOOP_INSTALL}/lib/native"

之后就是见证奇迹的时候了，

1 cd /opt/hadoop/

格式化hdfs

1 bin/hdfs namenode -format 

启动hdfs

1 sbin/start-dfs.sh
2 sbin/start-yarn.sh

理论上会见到

1 Starting namenodes on [localhost]
2 localhost: starting namenode, logging to /usr/opt/hadoop-2.6.0/logs/hadoop-hadoop-namenode-.out
3 localhost: starting datanode, logging to /usr/opt/hadoop-2.6.0/logs/hadoop-hadoop-datanode-.out
4 Starting secondary namenodes [0.0.0.0]
5 0.0.0.0: starting secondarynamenode, logging to /usr/opt/hadoop-2.6.0/logs/hadoop-hadoop-secondarynamenode-.out  

输入网址127.0.0.1:50070就可以看见hadoop的网页了，这就说明成功了。

参考：

http://www.centoscn.com/hadoop/2015/0118/4525.html

http://blog.csdn.net/yinan9/article/details/16805275

http://www.aboutyun.com/thread-10554-1-1.html