安装单机模式Hadoop-2.6.3(1)

 
jdk下载地址
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
 
添加hadoop用户
[root@centos67 ~]# useradd hadoop
[root@centos67 ~]# passwd hadoop
[root@centos67 ~]# ssh-keygen #生成密钥
[root@centos67 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@127.0.0.1
将主机名写入hosts文件中
[root@centos67 ~]# echo "127.0.0.1 `hostname`" >> /etc/hosts

下载jdk-8u71-linux-x64.tar.gz
[root@centos67 ~]# tar xf jdk-8u71-linux-x64.tar.gz -C /usr/local/
[root@centos67 ~]# cd /usr/local/
[root@centos67 local]# mv jdk1.8.0_71 java
[root@centos67 ~]# vim /etc/profile.d/java.sh
#!/bin/bash

export JAVA_HOME=/usr/local/java    #这里是你对应的jdk目录
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin

[root@centos67 ~]# bash /etc/profile.d/java.sh
测试jdk是否安装成功
[root@centos67 ~]# java -version
java version "1.8.0_71"
Java(TM) SE Runtime Environment (build 1.8.0_71-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.71-b15, mixed mode)

hadoop下载地址
http://www.apache.org/dyn/closer.cgi/hadoop/common/hadoop-2.6.3/hadoop-2.6.3.tar.gz 

下载hadoop-2.6.3.tar.gz
[root@centos67 ~]# tar xf hadoop-2.6.3.tar.gz -C /usr/local/
[root@centos67 ~]# cd /usr/local/
[root@centos67 local]# mv hadoop-2.6.3 hadoop
[root@centos67 ~]# vim /etc/profile.d/hadoop.sh
#!/bin/bash

export HADOOP_HOME=/usr/local/hadoop
export PATH=$PATH:$HADOOP_HOME/bin

[root@centos67 ~]# bash /etc/profile.d/hadoop.sh
测试hadoop是否安装成功
[root@centos67 ~]# hadoop version
Hadoop 2.6.3
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r cc865b490b9a6260e9611a5b8633cab885b3d247
Compiled by jenkins on 2015-12-18T01:19Z
Compiled with protoc 2.5.0
From source with checksum 722f77f825e326e13a86ff62b34ada
This command was run using /usr/local/hadoop/share/hadoop/common/hadoop-common-2.6.3.jar

下面开始正式的配置hadoop
涉及到的文件有:
/usr/local/hadoop/etc/hadoop/
hadoop-env.sh
yarn-env.sh
yarn-site.xml
core-site.xml
hdfs-site.xml
mapred-site.xml

修改hadoop-env.sh配置文件
[root@centos67 ~]# cd /usr/local/hadoop/etc/hadoop
[root@centos67 ~]# vim hadoop-env.sh
#添加以下内容
export JAVA_HOME=/usr/local/java
export HADOOP_PREFIX=/usr/local/hadoop

修改yarn-env.sh配置文件,将以下内容替换
[root@centos67 ~]# sed -i 's@^JAVA_HOME=$JAVA_HOME@JAVA_HOME=/usr/local/java@' yarn-env.sh

修改core-site.xml配置文件，配置hdfs的访问地址和端口
[root@centos67 ~]# vim core-site.xml
<configuration>
 <property>
    <name>fs.default.name</name>
    <value>hdfs://centos67:9000</value>
    <description>hdfs的访问地址</description>
</property>
<property>
    <name>hadoop.tmp.dir</name>
    <value>/home/hadoop/tmp/</value>
    <description>hdfs的临时目录</description>
</property>
</configuration>


修改hdfs-site.xml配置文件，备份方式默认为3，我的是单机模式，所以改为1了
[root@centos67 ~]# mkdir -p /home/hadoop/hdfs/{name,data}
[root@centos67 ~]# chown -R hadoop:hadoop /home/hadoop/hdfs 
[root@centos67 ~]# vim hdfs-site.xml
<configuration>
<property>
    <name>dfs.name.dir</name>
    <value>file:/home/hadoop/hdfs/name</value>
</property>
<property>
    <name>dfs.data.dir</name>
    <value>file:/home/hadoop/hdfs/data</value>
</property>
<property>
    <name>dfs.replication</name>
    <value>1</value>
</property>
</configuration>

修改hadoop配置文件MapReduce的配置文件mapred-site.xml，
[root@centos67 ~]# vim mapred-site.xml
<configuration>
<property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
</property>
</configuration>

修改hadoop配置文件yarn-site.xml
[root@centos67 ~]# vim yarn-site.xml
<configuration>
<property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
</property>
<property>
        <name>yarn.resourcemanager.webapp.address</name>
        <value>${yarn.resourcemanager.hostname}:8099</value>
</property>
</configuration>

至此，hadoop可以格式化并启动了。
[root@centos67 ~]# hadoop namenode -format
[root@centos67 ~]# /usr/local/hadoop/sbin/start-dfs.sh
[root@centos67 ~]# jps
1472 DataNode
1660 SecondaryNameNode
2159 Jps
1375 NameNode
有这么几个进程，说明已经成功启动了

[root@centos67 ~]# /usr/local/hadoop/sbin/start-yarn.sh
1472 DataNode
2294 NodeManager
2392 Jps
1660 SecondaryNameNode
2205 ResourceManager
1375 NameNode

查看是否有9000端口
[root@centos67 ~]# netstat -lnpt | grep 9000

网页访问
http://localhost:50070