最近在系统的学习hadoop
课程第一步是安装hadoop1.x，具体安装步骤如下：
一、系统安装
本文使用centos6.5安装，具体安装步骤省略
二、jdk安装
下载jdk1.7.0_51解压，在环境中
设置环境变量：
vi /etc/profile,添加如下行：
export JAVA_HOME=/usr/local/jdk1.7.0_51
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
由于在centos下安装，选择需要设置jdk版本
update-alternatives --install /usr/bin/java java /export/home/es/jdk1.7.0_51/bin/java 60
update-alternatives --config java
三、linux基本参数设置
设置防火墙：
vi /etc/selinux/config
将红框标示部分，设置为disabled
查看防火墙情况，并关闭
service iptables status service ip6tables status service iptables stop service ip6tables stop chkconfig iptables off chkconfig ip6tables off四，免密码登陆
设置使用免密码登陆方式
vi /etc/ssh/sshd_config RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys将这三个部分的注释去掉，使用RSA验证方式
生成公钥
[hadoop@vm .ssh]$ pwd /export/home/hadoop/.ssh [hadoop@vm .ssh]$ ssh-keygen -t rsa Generating public/private rsa key pair. ...... [hadoop@vm .ssh]$ cp id_rsa.pub authorized_keys [hadoop@vm .ssh]$ ls authorized_keys id_rsa id_rsa.pub修改hosts文件：
[hadoop@vm conf]$ more /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.2.201 vm.master
192.168.2.202 vm.slave1
192.168.2.203 vm.slave2
修改hostname
[hadoop@vm etc]$ vi /etc/sysconfig/network NETWORKING=yes HOSTNAME=vm.master四，修改hadoop配置文件
[hadoop@vm conf]$ pwd
/export/home/hadoop/hadoop-1.2.1/conf
修改
core-site.xml
[hadoop@vm conf]$ vi core-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>fs.default.name</name> <value>hdfs://localhost:9000</value> </property> </configuration>修改hdfs-site.xml
[hadoop@vm conf]$ 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.replications</name> <value>1</value> </property> </configuration>修改mapred-site.xml
[hadoop@vm conf]$ 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>localhost:9001</value> </property> </configuration>设置JAVA_HOME
五，尝试启动
format namenode
尝试启动
搭建完毕
搭建完毕