jdk installation
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> 本仓库涉及的所有软件的详细搭建步骤整理至:[linux下大数据常用软件安装指南](https://github.com/heibaiying/BigData-Notes/blob/master/notes/linux下大数据常用软件安装指南.md)
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## 一、Hadoop
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1. [分布式文件存储系统——HDFS](https://github.com/heibaiying/BigData-Notes/blob/master/notes/Hadoop-HDFS.md)
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notes/installation/JDK安装.md
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notes/installation/JDK安装.md
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# linux 下 JDK 的安装
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**系统环境**:centos 7.6
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**JDK版本**:jdk 1.8.0_20
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## 安装步骤:
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#### 1. 下载jdk安装包
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在[官网](https://www.oracle.com/technetwork/java/javase/downloads/index.html)下载所需版本的jdk,上传至服务器对应位置。(这里我们下载的版本为[jdk1.8](https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html) ,上传至服务器的/usr/java/目录下)
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#### 2. 解压jdk-8u201-linux-x64.tar.gz安装包
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```shell
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[root@ java]# tar -zxvf jdk-8u201-linux-x64.tar.gz
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```
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#### 3. 设置环境变量
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```shell
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[root@ java]# vi /etc/profile
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```
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在文件末尾末尾添加:
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```shell
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export JAVA_HOME=/usr/java/jdk1.8.0_201
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export JRE_HOME=${JAVA_HOME}/jre
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export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
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export PATH=${JAVA_HOME}/bin:$PATH
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```
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#### 4. 执行source命令,使得配置立即生效
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```shell
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[root@ java]# source /etc/profile
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```
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#### 5. 检查是否安装成功
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```shell
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[root@ java]# java -version
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```
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显示出对应的版本信息则代表安装成功。
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```shell
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java version "1.8.0_201"
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Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
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Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)
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```
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notes/linux下大数据常用软件安装指南.md
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## 大数据环境搭建指南
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### 一、JDK
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1. [linux环境下JDK的安装](https://github.com/heibaiying/BigData-Notes/blob/master/notes/installation/JDK安装.md)
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