|NO.Z.00003|——————————|Deployment|——|Hadoop&Spark环境部署.v03|——|Hadoop.v03|环境变量配置|

一、集群规划

	hadoop1	hadoop2	hadoop3
NameNode	√
SecondaryNameNode		√
DataNode	√	√	√
ResourceManager	√
DataManager	√	√	√
Hive	√	√	√
HiveServer2		√

二、HDFS和YARN集群规划

框架	HDFS	YARN
Hadoop01	NameNode DataNode	ResourceManager DataManager
Hadoop02	SecondaryNameNode DataNode	DataManager
Hadoop03	DataNode	DataManager

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一、安装Hadoop：单节点配置

### --- 登录Hadoop01节点；进入/opt/yanqi/software,解压安装文件到/opt/yanqi/servers

[root@hadoop01 ~]# cd /opt/yanqi/software/
[root@hadoop01 software]# tar -zxvf hadoop-2.9.2.tar.gz -C /opt/yanqi/servers

### --- 查看是否解压成功

[root@hadoop01 ~]# ll /opt/yanqi/servers/hadoop-2.9.2

### --- 添加Hadoop到环境变量 vim /etc/profile

~~~     # 所有节点配置环境变量
[root@hadoop01 ~]# vim /etc/profile
##HADOOP_HOME
export HADOOP_HOME=/opt/yanqi/servers/hadoop-2.9.2
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin

### --- 使环境变量生效

~~~     # 所有节点配置环境变量
[root@hadoop01 ~]# source /etc/profile

### --- 验证hadoop

[root@hadoop01 ~]# hadoop version
Hadoop 2.9.2
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r 826afbeae31ca687bc2f8471dc841b66ed2c6704
Compiled by ajisaka on 2018-11-13T12:42Z
Compiled with protoc 2.5.0
From source with checksum 3a9939967262218aa556c684d107985
This command was run using /opt/yanqi/servers/hadoop-2.9.2/share/hadoop/common/hadoop-common-2.9.2.jar

### --- hadoop目录结构

[root@hadoop01 ~]# ll /opt/yanqi/servers/hadoop-2.9.2/
total 128
drwxr-xr-x 2 501 dialout    194 Nov 13  2018 bin
drwxr-xr-x 3 501 dialout     20 Nov 13  2018 etc
drwxr-xr-x 2 501 dialout    106 Nov 13  2018 include
drwxr-xr-x 3 501 dialout     20 Nov 13  2018 lib
drwxr-xr-x 2 501 dialout    239 Nov 13  2018 libexec
-rw-r--r-- 1 501 dialout 106210 Nov 13  2018 LICENSE.txt
-rw-r--r-- 1 501 dialout  15917 Nov 13  2018 NOTICE.txt
-rw-r--r-- 1 501 dialout   1366 Nov 13  2018 README.txt
drwxr-xr-x 3 501 dialout   4096 Nov 13  2018 sbin
drwxr-xr-x 4 501 dialout     31 Nov 13  2018 share

### --- 注释说明

~~~     bin目录:对Hadoop进行操作的相关命令，如hadoop,hdfs等
~~~     etc目录：Hadoop的配置文件目录，入hdfs-site.xml,core-site.xml等
~~~     lib目录：Hadoop本地库（解压缩的依赖）
~~~     sbin目录: 存放的是Hadoop集群启动停止相关脚本，命令
~~~     share目录:Hadoop的一些jar,官方案例jar，文档等

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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