一、安装版本

hadoop-2.7.5

下载地址：Index of /dist/hadoop/core (apache.org)

二、准备工作

1、安装jdk 8及以上版本

2、修改主机名称（可以不修改）

3、关闭防火墙

三、安装

1、解压到/opt目录下

tar -zxvf hadoop-2.7.5.tar.gz -C /opt/

2、配置hadoop环境变量

vim /etc/profile

export HADOOP_HOME=/opt/hadoop-2.7.5

export PATH=$PATH:$HADOOP_HOME/bin

source /etc/profile

3、配置Haddop

3.1、hadoop-env.sh

vi /opt/hadoop-2.7.5/etc/hadoop/hadoop-env.sh

找到# The java implementation to use.将其下面的一行改为：

#export JAVA_HOME=${JAVA_HOME}

export JAVA_HOME=export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64/j

3.2、配置core-site.xml

vim /opt/hadoop-2.7.5/etc/hadoop/core-site.xml

<configuration>
    <property>
        <name>hadoop.tmp.dir</name>
        <value>file:///opt/hadoop-2.7.5</value>
        <description>Abase for other temporary directories.</description>
    </property>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://master:8888</value>
    </property>
</configuration>

3.3、配置hdfs-site.xml

vim /opt/hadoop-2.7.5/etc/hadoop/hdfs-site.xml

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>file:///opt/hadoop-2.7.5/tmp/dfs/name</value>
    </property>
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>file:///opt/hadoop-2.7.5/tmp/dfs/data</value>
    </property>
</configuration>

4、启动hadoop

4.1、第一次启动时需要先格式化

cd /opt/hadoop-2.7.5

./bin/hdfs namenode -format

如果遇到

Re-format filesystem in Storage Directory /opt/hadoop-2.7.5/tmp/dfs/name ? (Y or N)
输入：Y

4.2、启动

./sbin/start-dfs.sh

4.3、停止

./sbin/stop-dfs.sh

4.4、验证

http://localhost:50070

5、配置yarn

5.1、配置mapred-site.xml

cd /opt/hadoop-2.7.5/etc/hadoop/

p mapred-site.xml.template mapred-site.xml

vim mapred-site.xml

<configuration>
  <property>
    <name>mapred.job.tracker</name>
    <value>master:9001</value>
  </property>
  <property>
    <name>mapred.local.dir</name>
    <value>/opt/hadoop-2.7.5/tmp/var</value>
  </property>
  <property>
     <name>mapreduce.framework.name</name>
     <value>yarn</value>
  </property>
</configuration>

5.2、配置yarn-site.xml

vim yarn-site.xml

<configuration>
    <!-- reducer取数据的方式是mapreduce_shuffle -->
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
</configuration>

5.3、yarn启动与停止

cd /opt/hadoop-2.7.5

./sbin/start-yarn.sh 

./sbin/stop-yarn.sh

浏览器查看：http://localhost:8088

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