安装Hadoop的准备工作：

1、修改/etc/hosts? 2、配置JDK? 3、关闭防火墙? 4、配置SSH（免密码登录）

# tar zxf hadoop-2.7.2.tar.gz? （安装及配置Hadoop）

修改配置文件：

cd /opt/hadoop/hadoop-2.7.2/etc/hadoop/

修改配置文件：

1、core-site.xml

<configuration>

?<property>

??? <name>fs.default.name</name>

??? <value>hdfs://centos:9000</value>

? </property>

?<property>

??? <name>hadoop.tmp.dir</name>

??? <value>/opt/hadoop/hadoop-2.7.2/current/tmp</value>

? </property>

?<property>

??? <name>fs.trash.interval</name>

??? <value>4320</value>

? </property>

</configuration>

2、hdfs-site.xml

<configuration>

?<property>

?? <name>dfs.namenode.name.dir</name>

?? <value>/opt/hadoop/hadoop-2.7.2/current/dfs/name</value>

?</property>

?<property>

?? <name>dfs.datanode.data.dir</name>

?? <value>/opt/hadoop/hadoop-2.7.2/current/data</value>

?</property>

?<property>

?? <name>dfs.replication</name>

?? <value>1</value>

?</property>

?<property>

?? <name>dfs.webhdfs.enabled</name>

?? <value>true</value>

?</property>

?<property>

?? <name>dfs.permissions.superusergroup</name>

?? <value>staff</value>

?</property>

?<property>

?? <name>dfs.permissions.enabled</name>

?? <value>false</value>

?</property>

</configuration>

3、yarn-site.xml

<configuration>

<!-- Site specific YARN configuration properties -->

?<property>

?? <name>yarn.resourcemanager.hostname</name>

?? <value>centos</value>

?</property>

?<property>

?? <name>yarn.nodemanager.aux-services</name>

?? <value>mapreduce_shuffle</value>

?</property>

?<property>

?? <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>

?? <value>org.apache.hadoop.mapred.ShuffleHandler</value>

?</property>

?<property>

?? <name>yarn.resourcemanager.address</name>

?? <value>centos:18040</value>

?</property>

?<property>

?? <name>yarn.resourcemanager.scheduler.address</name>

?? <value>centos:18030</value>

?</property>

?<property>

?? <name>yarn.resourcemanager.resource-tracker.address</name>

?? <value>centos:18025</value>

?</property>

? <property>

?? <name>yarn.resourcemanager.admin.address</name>

?? <value>centos:18141</value>

?</property>

?<property>

?? <name>yarn.resourcemanager.webapp.address</name>

?? <value>centos:18088</value>

?</property>

?<property>

?? <name>yarn.log-aggregation-enable</name>

?? <value>true</value>

?</property>

?<property>

?? <name>yarn.log-aggregation.retain-seconds</name>

?? <value>86400</value>

?</property>

?<property>

?? <name>yarn.log-aggregation.retain-check-interval-seconds</name>

?? <value>86400</value>

?</property>

?<property>

?? <name>yarn.nodemanager.remote-app-log-dir</name>

?? <value>/tmp/logs</value>

?</property>

?<property>

?? <name>yarn.nodemanager.remote-app-log-dir-suffix</name>

?? <value>logs</value>

?</property>

</configuration>

4、mapred-site.xml

# cp mapred-site.xml.template mapred-site.xml

# vi mapred-site.xml

<configuration>

?<property>

? <name>mapreduce.framework.name</name>

? <value>yarn</value>

?</property>

?<property>

? <name>mapreduce.jobtracker.http.address</name>

? <value>centos:50030</value>

?</property>

?<property>

? <name>mapreduce.jobhisotry.address</name>

? <value>centos:10020</value>

?</property>

?<property>

? <name>mapreduce.jobhistory.webapp.address</name>

? <value>centos:19888</value>

?</property>

?<property>

? <name>mapreduce.jobhistory.done-dir</name>

? <value>/jobhistory/done</value>

?</property>

?<property>

? <name>mapreduce.intermediate-done-dir</name>

? <value>/jobhisotry/done_intermediate</value>

?</property>

?<property>

? <name>mapreduce.job.ubertask.enable</name>

? <value>true</value>

?</property>

</configuration>

5、slaves

centos

6、hadoop-env.sh

# The java implementation to use.

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el7_5.x86_64

#修改/etc/profile

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64

export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export HADOOP_HOME=/opt/hadoop/hadoop-2.7.2

#使生效

source /etc/profile

# /opt/hadoop/hadoop-2.7.2/bin/hdfs namenode -format （格式化HDFS）

# /opt/hadoop/hadoop-2.7.2/sbin/start-all.sh （启动Hadoop集群）

# jps（验证Hadoop集群）

2401 ResourceManager

4066 RunJar

1798 SecondaryNameNode

1497 NameNode

2506 NodeManager

3244 RunJar

4783 Jps

#关闭防火墙，或者在防火墙的规则中开放这些端口

http://192.168.236.167:50070 （hdfs）

http://192.168.236.167:18088 （yarn）

cs