1. 安装JDK
JDK安装包复制到/opt文件夹
cd /opt
rpm -ivh jdk-8u121-linux-x64.rpm
vim /etc/profile
增加 JAVA_HOME=/usr/java/default
PATH=$JAVA_HOME/bin:$PATH
source /etc/profile
验证 echo $JAVA_HOME
java -version
2. 配置SSH（免密码登录）,Hadoop集群间登录使用。
a> 在客户端进行如下操作：
ssh-keygen -t rsa 生成密钥
cat id_rsa.pub >> authorized_keys 客户端注册公钥
cat id_rsa.pub | ssh root@bigdata.mysql "cat - >> ~/.ssh/authorized_keys" 注册公钥到服务器
b> 在服务器段进行：
chmod 700 -R .ssh
chmod 600 .ssh/authorized_keys
或者：在客户端直接 ssh-copy-id ~/.ssh/id_rsa.pub root@bigdata.mysql
c> 测试
在客户端：ssh bigdata.mysql
3. Hadoop集群搭建-Master
tar zxf hadoop-2.7.3.tar.gz
vim /etc/profile
增加 HADOOP_HOME=/opt/hadoop-2.7.3
PATH增加$HADOOP_HOME/bin:段
source /etc/profile
检查 echo $HADOOP_HOME
cd /opt/hadoop-2.7.3/etc/hadoop/
配置：core-site.xml; hdfs-site.xml; yarn-site.xml; mapred-site.xml; slaves
core-site.xml
<property>
<name>fs.default.name</name>
<value>hdfs://bigdata.hadoop.master:9000</value>
</property> <property>
<name>hadoop.tmp.dir</name>
<value>/opt/hadoop-2.7.3/current/tmp</value>
</property> <property>
<name>fs.trash.interval</name>
<value>4320</value>
</property>
mkdir -p /opt/hadoop-2.7.3/current/tmp
hdfs-site.xml
<property>
<name>dfs.namenode.name.dir</name>
<value>/opt/hadoop-2.7.3/current/data</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>/opt/hadoop-2.7.3/current/name</value>
</property> <property>
<name>dfs.datanode.data.dir</name>
<value>/opt/hadoop-2.7.3/current/data</value>
</property> <property>
<name>dfs.replication</name>
<value>3</value>
</property> <property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property> <property>
<name>dfs.permission.superusergroup</name>
<value>staff</value>
</property> <property>
<name>dfs.permission.enabled</name>
<value>false</value>
</property>
mkdir -p /opt/hadoop-2.7.3/current/name
mkdir -p /opt/hadoop-2.7.3/current/data
yarn-site.xml
<property>
<name>yarn.resourcemanager.hostname</name>
<value>bigdata.hadoop.master</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>bigdata.hadoop.master:18040</value>
</property> <property>
<name>yarn.resourcemanager.scheduler.address</name>
<value>bigdata.haddop.master:18030</value>
</property> <property>
<name>yarn.resourcemanager.resource-tracker.address</name>
<value>bigdata.hadoop.master:18025</value>
</property> <property>
<name>yarn.resource.manager.admin.address</name>
<value>bigdata.hadoop.master:18141</value>
</property> <property>
<name>yarn.resourcemanager.webapp.address</name>
<value>bigdata.hadoop.master: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>
mapred-site.xml
cp mapred-site.xml.template mapred-site.xml
vim mapred-site.xml
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property> <property>
<name>mapreduce.jobtracker.http.address</name>
<value>bigdata.hadoop.master:50030</value>
</property> <property>
<name>mapreduce.jobhistory.address</name>
<value>bigdata.hadoop.master:10020</value>
</property> <property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>bigdata.hadoop.master:19888</value>
</property> <property>
<name>mapreduce.jobhistory.done-dir</name>
<value>/jobhistory/done</value>
</property> <property>
<name>mapreduce.intermediate-done-dir</name>
<value>/jobhistory/done_intermediate</value>
</propery> <property>
<name>mapreduce.job.ubertask.enable</name>
<value>true</value>
</property>
slaves
bigdata.hadoop.master
bigdata.hadoop.slave1
bigdata.hadoop.slave2
bigdata.hadoop.slave3
vim /opt/hadoop-2.7.3/etc/hadoop/hadoop-env.sh
export JAVA_HOME=/usr/java/default
4. 创建Slaves虚拟机
bigdata.hadoop.slave1
bigdata.hadoop.slave2
bigdata.hadoop.slave3
5. SSH免密码登录
在bigdata.hadoop.master上执行：
ssh-keygen -t rsa --生成密钥公钥，一路回车
ssh-copy-id -i ~/.ssh/id_rsa.pub root@bigdata.hadoop.slave1
ssh-copy-id -i ~/.ssh/id_rsa.pub root@bigdata.hadoop.slave2
ssh-copy-id -i ~/.ssh/id_rsa.pub root@bigdata.hadoop.slave2
cat ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
测试免密码登录
ssh bigdata.hadoop.slave1, ssh bigdata.hadoop.slave2, ssh bigdata.hadoop.slave3, ssh bigdata.hadoop.master
6. 关闭防火墙和SELIXNUX
service iptables stop --临时关闭防火墙
chkconfig iptables off --永久关闭
chkconfig --list|grep iptables
vi /etc/sysconfig/selinux
SELINUX=disabled
setenforce 0
getenforce
7. Copy文件到虚拟机
安装scp命令：yum install openssh-clients
scp -r /opt/hadoop-2.7.3 root@bigdata.hadoop.slave1:/opt/
配置Slaves的etc/profile
8. 格式化Hadoop
在Master上执行： hdfs namenode -format
9. 启动Hadoop
在Master上执行：/opt/hadoop-2.7.3/sbi/start-all.sh
10. 查看Hadoop状态
在Master执行：JPS
NodeManager; NameNode; SecondaryNameNode; ResourceManager; DataNode
在Slaves上执行：JPS
NodeManager; DataNode;
在外部访问：http://bigdata.hadoop.master:50070 和 http://bigdata.hadoop.master:18088
打开ServiceHistoryServer
/opt/hadoop-2.7.3/sbin/mr-jobhistory-daemon.sh start historyserver
在外部访问：http://bigdata.hadoop.master:19888
11. 执行Map-Reduce任务
词频统计
1. 将1个txt文本上传到hdfs
hdfs dfs -put testfile.txt /task1/input/testfile
2. 执行Map-Reduce任务
hadoop jar /opt/hadoop-2.7.3/share/hadoop/mareduce/hadoop-mapreduce-examples-2.7.3 jar wordcound /task1/input/testfile /task1/output
3. 查看输出结果
hdfs dfs -cat /task1/output/part-r-00000