大话王十三

> 初始环境 http://wangshisan.com/blog/install-hadoop-one.html

#准备工作

http://mirror.bit.edu.cn/apache/hadoop/common/hadoop-2.6.4/

hadoop-2.6.4.tar.gz    		编译版本

hadoop-2.6.4-src.tar.gz  	源码版本

我个人不喜欢使用源码版本。所以直接使用编译版本，如果后期我们需要改变环境时。在使用源码版本。

##解压文件

cd /vagrant  
	tar zxvf ./hadoop-2.6.4.tar.gz 			//解压hadoop
	sudo mv ./hadoop-2.6.4 /usr/local/		//改变目录路径
	cd /usr/local/							//跳入目录
	sudo mv ./hadoop-2.6.4 ./hadoop 		//改变目录名称
	sudo chmod -R hadoop:hadoop ./hadoop 	//修改目录所属用户与组

##测试
建立一个目录。随便放入一些文本文件。让hadoop 去进行检索。计算个数

cd /usr/local/hadoop
	sudo mkdir ./input                   // 创建一个测试目录
	sudo cp ./etc/hadoop/*.xml ./input   // 随便放入一些文件进入 让HADOOP进行检索
	./bin/hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.4.jar grep ./input ./output 'dfs[a-z.]+'
	cat ./output/*

PS:每次运行 hadoop 测试 都需要删除 output 目录。 hadoop 不会删除或者覆盖这个目录的。不然就报错的。

##恭喜你单机版已安装完成了,下面来做伪分布式

##设置 Hadoop 环境变量

sudo vi /etc/profile

----------------------------------------------------------------
	export HADOOP_HOME=/usr/local/hadoop
	export HADOOP_INSTALL=$HADOOP_HOME
	export HADOOP_MAPRED_HOME=$HADOOP_HOME
	export HADOOP_COMMON_HOME=$HADOOP_HOME
	export HADOOP_HDFS_HOME=$HADOOP_HOME
	export YARN_HOME=$HADOOP_HOME
	export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
	export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin
	----------------------------------------------------------------

sudo source /etc/profile

##配置缓存配置与HDFS配置

cd /usr/local/hadoop
	vi ./etc/hadoop/core-site.xml
	
	-----------------------------------------------------------------
	<configuration>
		
	    <property>
	        <name>hadoop.tmp.dir</name>
	        <value>file:/home/hadoop/tmp</value>
	        <description>Abase for other temporary directories.</description>
	    </property>
	    
	    <property>
	        <name>fs.defaultFS</name>
	        <value>hdfs://localhost:9000</value>
	    </property>
	</configuration>
	------------------------------------------------------------------
	
	vi ./etc/hadoop/hdfs-site.xml

------------------------------------------------------------------
	<configuration>
		
		<property>
	        <name>dfs.replication</name>
	        <value>1</value>
	    </property>

<property>
	        <name>dfs.namenode.name.dir</name>
	        <value>file:/home/hadoop/tmp/dfs/name</value>
	    </property>
	    <property>
	        <name>dfs.datanode.data.dir</name>
	        <value>file:/home/hadoop/tmp/dfs/data</value>
	    </property>

</configuration>
	------------------------------------------------------------------
	
	//配置完成后，执行NAMENODE格式化
	./bin/hdfs namenode -format

> 成功的话，会看到 “successfully formatted” 和 “Exitting with status 0” 的提示，若为 “Exitting with status 1” 则是出错。

![Exitting with status 0 or 1 ](/images/install-hadoop-two-img-1.png)

## 启动YARN (MapReduce)

mv ./etc/hadoop/mapred-site.xml.template ./etc/hadoop/mapred-site.xml
	vi ./etc/hadoop/mapred-site.xml.template
	------------------------------------------------------------------
	<configuration>
	
	 <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
	</configuration>
	------------------------------------------------------------------
	
	vi ./yarn-site.xml

<configuration>
	
		<property>
	        <name>yarn.nodemanager.aux-services</name>
	        <value>mapreduce_shuffle</value>
	    </property>
	
		<property>
	        <name>yarn.resourcemanager.hostname</name>
	        <value>192.168.31.30</value>
	    </property>
	</configuration>

## 初始化 HDFS 的文件系统
	
	./bin/hdfs namenode -format

##启动HDFS Yarn 
 	./sbin/start-dfs.sh 	//启动HDFS

![检查启动项目](/images/install-hadoop-two-img-2.png)

./sbin/start-yarn.sh 	//启动YARN

![检查启动项目](/images/install-hadoop-two-img-3.png)

##验证登录

http://192.168.31.30:50070 //查看HDFS

![查看存活的节点](/images/install-hadoop-two-img-4.png)

![查看存活的节点](/images/install-hadoop-two-img-5.png)

./bin/hdfs dfs -mkdir -p /user/hadoop //创建用户的目录 （非必要）
	./bin/hdfs dfs -mkdir input (在用户下面创建目录，根据当前登录的用户名)

![查看已开放的目录](/images/install-hadoop-two-img-6.png)

http://192.168.31.30:8088 // 查询YARN

> 初始环境 vagrant box   https://github.com/CommanderK5/packer-centos-template/releases/download/0.6.7/vagrant-centos-6.7.box

> 计划构建
>
> node1 : HDFS NameNode + Spark Master 		//对外服务器
>
> node2 : YARN ResourceManager + JobHistoryServer + ProxyServer 	 //调度服务器 job
>
> node3 : HDFS DataNode + YARN NodeManager + Spark Slave			//节点服务器1
>
> node4 : HDFS DataNode + YARN NodeManager + Spark Slave			//节点服务器2

#Hadoop 个人理解。
Hadoop 只是一个数据框架。基于分布式文件(HDSF)上的一种协议。不要被神话吓到了。就和我们编写程序一样。只是加载了几个类。方便用而已。

#Hadoop 安装准备

1.首先安装 JAVA SDK

sudo yum install java-1.8.0-openjdk java-1.8.0-openjdk-devel

vi /etc/profile //新增JDK的环境变量

> export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk.x86_64/

[root@localhost vagrant]# java -version
	openjdk version "1.8.0_71"
	OpenJDK Runtime Environment (build 1.8.0_71-b15)
	OpenJDK 64-Bit Server VM (build 25.71-b15, mixed mode)

[root@localhost vagrant]# $JAVA_HOME/bin/java -version 
	openjdk version "1.8.0_71"
	OpenJDK Runtime Environment (build 1.8.0_71-b15)
	OpenJDK 64-Bit Server VM (build 25.71-b15, mixed mode)

2.创建hadoop 用户

su root  //切换ROOT用户
	useradd -m hadoop -s /bin/bash　//创建hadoop 用户
	passwd hadoop //修改密码
	visudo  //特殊处理 给 Hadoop 增加管理员权限 (个人测试设置，生产环境不敢这样设置)
	------------------------------------------------------
	>## Allow root to run any commands anywhere
	>root    ALL=(ALL)       ALL
	>hadoop  ALL=(ALL)       ALL
	------------------------------------------------------
3.使用vagrant 打包虚拟机

sudo rm -f /etc/udev/rules.d/70-persistent-net.rules 	//删除liuunx 网卡配置
	vagrant package --output centos-java-hadoop.box     	//母机目录下打包vagrant box
建立一个基础镜像未来将会使用该基础进行搭建HADOOP节点。

4.vagrant 加载基础镜像

vagrant box add hadoop-base ./centos-java-hadoop.box

5.创建 vagrant 集群

Vagrant.configure(2) do |config|
			config.vm.define "service" do |node|
				 node.vm.box = "hadoop-base"
			  node.vm.network "private_network", ip: "192.168.31.30"
			  node.vm.synced_folder "./data", "/hadoop_data"
			  node.vm.provider "virtualbox" do |v|
			    v.name = "service"
			    v.customize ["modifyvm", :id, "--memory", "1024"]
			  end
			end
			config.vm.define "service-job" do |node|
			 node.vm.box = "hadoop-base"
			  node.vm.network "private_network", ip: "192.168.31.31"
			  node.vm.synced_folder "./data", "/hadoop_data"
			  node.vm.provider "virtualbox" do |v|
			    v.name = "service-job"
			    v.customize ["modifyvm", :id, "--memory", "1024"]
			  end
			end
			config.vm.define "service-node-1" do |node|
			  node.vm.box = "hadoop-base"
			  node.vm.network "private_network", ip: "192.168.31.36"
			  node.vm.synced_folder "./data", "/hadoop_data"
			  node.vm.provider "virtualbox" do |v|
			    v.name = "service-node-1"
			    v.customize ["modifyvm", :id, "--memory", "1024"]
			  end
			end
			config.vm.define "service-node-2" do |node|
			  node.vm.box = "hadoop-base"
			  node.vm.network "private_network", ip: "192.168.31.37"
			  node.vm.synced_folder "./data", "/hadoop_data"
			  node.vm.provider "virtualbox" do |v|
			    v.name = "service-node-2"
			    v.customize ["modifyvm", :id, "--memory", "1024"]
			  end
			end
		end

Hadoop 简要安装(二)

Hadoop 简要安装(一)

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