hadoop分布式环境搭建步骤

1.准备三台机器
更改hostname,/etc/hosts
master
slave1
slave2
2.局域网联通

3.免密码登录
master免密码登录slave1&slave2
4.安装JDK
安装jdk,配置环境变量
export JAVA_HOME=/usr/share/jdk1.6.0_14 
export PATH=$JAVA_HOME/bin:$PATH 
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
5.安装Hadoop
安装hadoop，配置环境变量
hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>

core-site.xml

<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/hadoop/tmp</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://192.168.1.2:9000</value>
</property>
</configuration>



mapred-site.xml

<configuration>
<property>
<name>mapred.job.tracker</name>
<value>http://192.168.1.2:9001</value>
</property>
</configuration>
6.hadoop目录分发
拷贝hadoop安装目录到slave(注意slave配置安装jdk，配置hadoop环境变量)
7.关闭防火墙

8.格式化

9.启动

10.验证
jps 50030 50070