centos6.5 安装hadoop1.2.1的教程详解【亲测版】

本篇只简单介绍安装步骤

 1. 角色分配

10.11.84.4 web-crawler--1.novalocal master/slave
10.11.84.5 web-crawler--2.novalocal slave
10.11.84.6 web-crawler--3.novalocal slave

2.安装目录 /usr/local/hadoop （hadoop_home）

3,创建group hadoop

groupadd hadoop

4.创建用户hadoop

useradd -d /home/hadoop -g hadoop hadoop
chown -r hadoop:hadoop /usr/local/hadoop

5. 每台机器安装jdk（安装在相同的目录）

1)查看java 版本，可以看到jdk为openjdk，最好更换为sun jdk

[hadoop@hadoop2 ~]$ java -version
openjdk version "1.8.0_131"
openjdk runtime environment (build 1.8.0_131-b12)
openjdk 64-bit server vm (build 25.131-b12, mixed mode)
[hadoop@hadoop2 ~]$ rpm -qa | grep java
java-1.8.0-openjdk-headless-1.8.0.131-11.b12.el7.x86_64
javapackages-tools-3.4.1-11.el7.noarch
tzdata-java-2017b-1.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.5.el7.x86_64
java-1.7.0-openjdk-1.7.0.141-2.6.10.5.el7.x86_64
java-1.8.0-openjdk-1.8.0.131-11.b12.el7.x86_64
python-javapackages-3.4.1-11.el7.noarch

2）卸载openjdk

rpm -qa | grep java | xargs yum -y remove

3）安装sunjdk

/usr/local 目录下解压jdk-8u181-linux-i586.tar.gz 并命名为jdk

配置环境变量如下

vim /etc/profile  末尾添加如下内容

export java_home=/usr/local/jdk
export jre_home=${java_home}/jre
export path=${java_home}/bin:${path}
export classpath=.:${java_home}/lib:${jre_home}/lib:${classpath} 

4）查看jdk是否安装成功

[root@hadoop2 local]# java -version
java version "1.8.0_151"
java(tm) se runtime environment (build 1.8.0_151-b12)
java hotspot(tm) 64-bit server vm (build 25.151-b12, mixed mode)

6. master 到 slave ssh 免密码登录

在每台机器hadoop用户下执行如下命令

[hadoop@hadoop1 ~]$ ssh-keygen -t rsa -p '' #一路直接回车
发送master 机器~/.ssh/id_rsa.pub 到所有slave节点
scp id_rsa.pub hadoop@10.11.84.5:~
scp id_rsa.pub hadoop@10.11.84.6:~
让后在每台slave节点hadoop 用户下执行如下命令
cd ~/.ssh
cat ../id_rsa.pub >> authorized_keys
chmod 644 authorized_keys

7.关闭所有机器防火墙、selinux

1）centos 7 以下

防火墙
查看防火墙状态
service iptables status
临时关闭防火墙
service iptables stop
永久关闭防火墙
chkconfig iptables off
 selinux
setenforce 0 #临时关闭
永久关闭需要修改如下文件
vim /etc/selinux/config
将selinux=enforcing改为selinux=disabled

2)centos 7

firewall-cmd --reload #重启firewall
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
firewall-cmd --state #查看默认防火墙状态（关闭后显示notrunning，开启后显示running）
selinux 同上

8.修改hadoop配置文件

core-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl" rel="external nofollow" rel="external nofollow" rel="external nofollow" ?>
<!-- put site-specific property overrides in this file. -->
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/hadoop/tmp</value>
<description>abase for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://web-crawler--1.novalocal:9000</value>
</property>
</configuration>
hadoop-env.sh 添加java_home
 export java_home=/usr/local/jdk
hdfs-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl" rel="external nofollow" rel="external nofollow" rel="external nofollow" ?>
<!-- put site-specific property overrides in this file. -->
<configuration>
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
<property>
<name>dfs.name.dir</name>
<value>/home/hadoop/name</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>/home/hadoop/data</value>
</property>
</configuration>
mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl" rel="external nofollow" rel="external nofollow" rel="external nofollow" ?>
<!-- put site-specific property overrides in this file. -->
<configuration>
 <property>
    <name>mapred.job.tracker</name>
    <value>http://web-crawler--1.novalocal:9001</value>;;;
  </property>
<property>
    <name>mapred.system.dir</name>
    <value>/home/hadoop/mapred/system</value>
  </property>
<property>
    <name>mapred.local.dir</name>
    <value>/home/hadoop/mapred/local</value>
  </property>
</configuration>

5)masters

web-crawler--1.novalocal

6)slaves

web-crawler--1.novalocal
web-crawler--2.novalocal 
web-crawler--3.novalocal

9. 修改环境变量，添加hadoop_home 和java_home

vim /etc/profile (root)
export ant_home=/usr/local/ant
export path=${path}:${ant_home}/bin
export hadoop_home=/usr/local/hadoop-1.2.1
export java_home=/usr/local/jdk
export path=$java_home/bin:$java_home/jre/bin:$path
export classpath=$java_home/lib:$java_home/jre/lib:$classpath
export path=/usr/local/lib/phantomjs/bin:$path
export ant_home=/usr/local/ant
export path=${path}:${ant_home}/bin
export path=$path:${hadoop_home}/bin:${hadoop_home}/sbin

10.启动hadoop

1）在master上format namenode

hadoop namenode -format

2)启动hadoop

sh /user/local/hadoop/bin/start-all.sh 

11.进行简单测试

hadoop fs -mkdir -p /user/hadoop/private/in
hadoop fs -put /user/local/hadoop/bin/start-all.sh /user/hadoop/private/in
cd /usr/local/hadoop
hadoop jar hadoop-examples-1.2.1.jar wordcount /user/hadoop/private/in /user/hadoop/private/out

总结

以上所述是小编给大家介绍的centos6.5 安装hadoop1.2.1的教程详解，希望对大家有所帮助