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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对免费资源网网站的支持！