hadoop 1.2.1 安装步骤伪分布式

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

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
<span>192.168.2.201 vm.master
192.168.2.202 vm.slave1
192.168.2.203 vm.slave2</span>

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