Cluster installation: http://blog.csdn.net/linghe301/article/details/9184453
Hadoop2.6 stand-alone installation
1. Installation environment
Hardware: Virtual machine
operating system: Centos 6.4 64-bit
IP: 10.51.121.10
Host name: datanode-4
Installation user: root
2. Install JDK and
install JDK1.6 or above. Install jdk1.6.0_45 here.
Download address: http://www.oracle.com/technetwork/java/javase/downloads/index.html
1. Download jdk1.6.0_45-linux-x64.gz and extract it to /usr/lib/jdk1.6.0_45.
2. Add the following configuration in /root/.bash_profile:
export JAVA_HOME=/usr/lib/jdk1.6.0_45
export PATH=$JAVA_HOME/bin:$PATH
3, make the environment variable take effect, #source ~/.bash_profile
4, Installation verification # java -version
java version “1.6.0_45”
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)
Third, configuration SSH passwordless login
$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
验证ssh，# ssh localhost
不需要输入密码即可登录。
四，安装Hadoop2.6
1，下载Hadoop2.6
下载地址：http://mirrors.hust.edu.cn/apache/hadoop/common/stable2/hadoop-2.6.5.tar.gz
2，解压安装
1），复制 hadoop-2.6.5.tar.gz 到/root/hadoop目录下，
然后#tar -xzvf hadoop-2.6.5.tar.gz解压，解压后目录为：/root/hadoop/hadoop-2.6.5
2），在/root /hadoop/目录下，建立tmp、hdfs/name、hdfs/data目录，执行如下命令
#mkdir /root/hadoop/tmp
#mkdir /root/hadoop/hdfs
#mkdir /root/hadoop/hdfs/data
#mkdir /root/hadoop/hdfs/name
3），设置环境变量，#vi ~/.bash_profile
# set hadoop path
export HADOOP_HOME=/root /hadoop/hadoop-2.6.5
export PATH=$PATH:$HADOOP_HOME/bin
4)，使环境变量生效，$source ~/.bash_profile
3，Hadoop配置
进入$HADOOP_HOME/etc/hadoop目录，配置 hadoop-env.sh等。涉及的配置文件如下：
hadoop-2.6.5/etc/hadoop/hadoop-env.sh
hadoop-2.6.5/etc/hadoop/yarn-env.sh
hadoop-2.6.5/etc/hadoop/core-site.xml
hadoop-2.6.5/etc/hadoop/hdfs-site.xml
hadoop-2.6.5/etc/hadoop/mapred-site.xml
hadoop-2.6.5/etc/hadoop/yarn-site.xml
1）配置hadoop-env.sh
# The java implementation to use.
#export JAVA_HOME=${JAVA_HOME}
export JAVA_HOME=/usr/lib/jdk1.6.0_45
2）配置yarn-env.sh
#export JAVA_HOME=/home/y/libexec/jdk1.6.0/
export JAVA_HOME=/usr/lib/jdk1.6.0_45
3）配置core-site.xml
添加如下配置：
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
<description>HDFS的URI，文件系统://namenode标识:端口号</description>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/root/hadoop/tmp</value>
<description>namenode上本地的hadoop临时文件夹</description>
</property>
</configuration>
4），配置hdfs-site.xml
添加如下配置
<configuration>
<!—hdfs-site.xml-->
<property>
<name>dfs.name.dir</name>
<value>/root/hadoop/hdfs/name</value>
<description>namenode上存储hdfs名字空间元数据 </description>
</property>
<property>
<name>dfs.data.dir</name>
<value>/root/hadoop/hdfs/data</value>
<description>datanode上数据块的物理存储位置</description>
</property>
<property>
<name>dfs.replication</name>
<value>1</value>
<description>副本个数，配置默认是3,应小于datanode机器数量</description>
</property>
</configuration>
5），配置mapred-site.xml
添加如下配置：
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
6），配置yarn-site.xml
添加如下配置：
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address</name>
<value>${yarn.resourcemanager.hostname}:8099</value>
</property>
</configuration>
4，Hadoop启动
1）格式化namenode
$ bin/hdfs namenode –format
2）启动NameNode 和 DataNode 守护进程
$ sbin/start-dfs.sh
3）启动ResourceManager 和 NodeManager 守护进程
$ sbin/start-yarn.sh
5，启动验证
1）执行jps命令，有如下进程，说明Hadoop正常启动
# jps
54679 NameNode
54774 DataNode
15741 Jps
9664 Master
55214 NodeManager
55118 ResourceManager
54965 SecondaryNameNode
2）在浏览器中输入：http://datanode-4:8099/ 即可看到YARN的ResourceManager的界面。注意：默认端口是8088，这里我设置了yarn.resourcemanager.webapp.address为：${yarn.resourcemanager.hostname}:8099。
这里写图片描述