hadoop集群安装配置
系统环境redhat 5.5-x64所需软件hadoop-0.21.0.tar.gz下载地址 ：http://www.apache.org/dyn/closer.cgi/hadoop/common/jdk-6u21-linux-x64.bin部署环境：namenode:192.168.10.20(hadoop1)datanode:192.168.10.21(hadoop2) 192.168.10.22(hadoop3) 192.168.10.23(hadoop4)一、安装1、在namenode:(在datanode上操作和以下相同)[hadoop@hadoop1 ~]# vi /etc/hosts192.168.10.20 hadoop1192.168.10.21 hadoop2192.168.10.22 hadoop3192.168.10.23 hadoop42、用root登陆,建立hadoop用户[hadoop@hadoop1 ~]# useradd hadoop[hadoop@hadoop1 ~]# passwd hadoop输入******做为密码3、su - hadoop #进入hadoop用户目录[hadoop@hadoop1 ~]# su - hadoop[hadoop@hadoop1 ~]$ ssh-keygen -t rsa #建立ssh目录,敲回车到底[hadoop@hadoop1 ~]$ cd .ssh/[hadoop@hadoop1 .ssh]$ lltotal 20-rw------- 1 hadoop hadoop 1675 Sep 23 16:19 id_rsa-rw-r--r-- 1 hadoop hadoop 403 Sep 23 16:19 id_rsa.pub-rw-r--r-- 1 hadoop hadoop 3136 Sep 24 15:23 known_hosts[hadoop@hadoop1 .ssh]$ scp -r id_rsa.pub hadoop@hadoop2:/home/hadoop/.ssh/[hadoop@hadoop1 .ssh]$ ssh hadoop2[hadoop@hadoop2 .ssh]$ cat id_rsa.pub >>authorized_keys[hadoop@hadoop2 .ssh]$ chmod 644 authorized_keys其它datanode机器操作一样4、jdk-6u21-linux-x64.bin安装[root@master src]# ./jdk-6u21-linux-x64.bin[root@master src]# mv jdk1.6.0_21 /usr/local/[root@master local]# ln -s jdk1.6.0_21 java5、hadoop-0.21.0.tar.gz安装[root@master src]# tar -zxvf hadoop-0.21.0.tar.gz[root@master src]# mv hadoop-0.21.0 /usr/local/[root@master local]# ln -s hadoop-0.21.0 hadoop6、修改环境变量[root@master src]# vi /etc/profileexport JAVA_HOME=/usr/local/javaexport CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/libexport PATH=$JAVA_HOME/lib:$JAVA_HOME/jre/bin:$PATH:$HOME/bin export HADOOP_HOME=/usr/local/hadoopexport PATH=$PATH:$HADOOP_HOME/bin [root@master src]# java -versionjava version "1.6.0_21"Java(TM) SE Runtime Environment (build 1.6.0_21-b06)Java HotSpot(TM) 64-Bit Server VM (build 17.0-b16, mixed mode)[root@master src]# hadoop versionHadoop 0.21.0Subversion https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.21 -r 985326Compiled by tomwhite on Tue Aug 17 01:02:28 EDT 2010From source with checksum a1aeb15b4854808d152989ba76f90fac二、配置配置文件1、hadoop-env.sh,core-site.xml,hdfs-site.xml,mapred-site.xml,hadoop-env.sh,masters,slavesnamenode配置[hadoop@hadoop1 ~]$ cd /usr/local/hadoop/conf/[hadoop@hadoop1 ~]$ vi hadoop-env.sh (修改java环境变量）export JAVA_HOME=/usr/local/java[hadoop@hadoop1 ~]$ vi core-site.xml(hdfs和mapreduce中很普通的I/O设置)<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><!-- Put site-specific property overrides in this file. --><configuration> <property> <name>fs.default.name</name> <value>hdfs://hadoop1:9000</value> </property></configuration>[hadoop@hadoop1 ~]$ vi hdfs-site.xml(HDFS后台程序设置的配置：名称节点，第二名称节点和数据节点)<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><!-- Put site-specific property overrides in this file. --><configuration> <property> <name>dfs.replication</name> <value>3</value> </property> <property> <name>dfs.name.dir</name> <value>/usr/local/hadoop/namenode/</value> </property> <property> <name>hadoop.tmp.dir</name> <value>/usr/local/hadoop/tmp/</value> </property></configuration>[hadoop@hadoop1 ~]$ vi mapred-site.xml<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><!-- Put site-specific property overrides in this file. --><configuration> <property> <name>mapred.job.tracker</name> <value>hadoop1:9001</value> </property> <property> <name>mapred.tasktracker.map.tasks.maximum</name> <value>4</value> </property> <property> <name>mapred.tasktracker.reduce.tasks.maximum</name> <value>4</value> </property></configuration>datanode配置 （只需修改hdfs-site.xml)[hadoop@hadoop2 ~]$ vi hdfs-site.xml<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><!-- Put site-specific property overrides in this file. --><configuration> <property> <name>dfs.replication</name> <value>3</value> </property> <property> <name>dfs.data.dir</name> <value>/home/hadoop/data</value> </property> <property> <name>hadoop.tmp.dir</name> <value>/usr/local/hadoop/tmp/</value> </property>[hadoop@hadoop1 conf]$ vi mastershadoop1[hadoop@hadoop1 conf]$ vi slaveshadoop2hadoop3hadoop4[hadoop@hadoop1 ~]$ start-all.sh[hadoop@hadoop1 ~]$ stop-all.sh
