[bamboo@hadoop-senior opt]$ ll

total 20

drwxr-xr-x. 2 bamboo bamboo 4096 Dec 30 18:05 datas

drwxr-xr-x. 4 bamboo bamboo 4096 Dec 30 18:32 modules

drwxr-xr-x. 2 root root 4096 Oct 3 22:14 rh

drwxr-xr-x. 2 bamboo bamboo 4096 Dec 30 18:16 softwares

drwxr-xr-x. 2 bamboo bamboo 4096 Dec 30 18:05 tools

• 　2.安装前先检查下 java

rpm -qa | grep java

如果有的话，会返回一系列的内容，

[bamboo@hadoop-senior opt]$ rpm -qa | grep java

[bamboo@hadoop-senior opt]$

可以看到我的机器是是没有的，如果返回有记录的话，则执行如下的命令

rpm -e --nodeps 1 2 3(1 2 3 是执行命令返回的结果集)

    3.1 解压 jdk

　　tar -zxvf jdk*.tar.gz -C /opt/modules

　　3.2 配置环境变量

　　vim /etc/profile

　　在最后添加如下的配置

　　export JAVA_HOME=/opt/modules/jdk1.7.0_67

　　export PATH=$PATH:$JAVA_HOME/bin

　　保存退出

　　3.3 生效配置

　　source /etc/profile

　　这样即可生效

　　3.4 验证 java 是否安装成功

　　[bamboo@localhost jdk1.7.0_67]$ java -version

　　java version "1.7.0_67"

　　Java(TM) SE Runtime Environment (build 1.7.0_67-b01)

　　Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

　　可以看到已经生效

4.1 解压 hadoop

tar -zxvf hadoop-2.5.0.tar.gz -C /opt/modules/

4.2 配置 hadoop-env.sh 环境变量

/opt/modules/hadoop-2.5.0/etc/hadoop/hadoop-env.sh

vim hadoop-env.sh

配置 jdk 路径

export JAVA_HOME=/opt/modules/jdk1.7.0_67

4.3 启动 hadoop (有 3 种启动方式)

4.3.1 切换到安装根目录，然后创建 input 目录

[bamboo@localhost hadoop-2.5.0]$ pwd

/opt/modules/hadoop-2.5.0

[bamboo@localhost hadoop-2.5.0]$ mkdir input

[bamboo@localhost hadoop-2.5.0]$ ls

bin etc include input lib libexec sbin share

4.3.2 把 etc/hadoop 下的 xml 文件 cp 到 input 目录下

[bamboo@localhost hadoop-2.5.0]$ cp etc/hadoop/*.xml input/

[bamboo@localhost hadoop-2.5.0]$ cd input/

[bamboo@localhost input]$ ls

capacity-scheduler.xml core-site.xml hadoop-policy.xml hdfs-site.xml httpfs-site.xml yarn-site.xml

4.3.3 启动 hadoop

bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar grep input output 'dfs[a-z.]+'

执行成功，并没有报错

执行 ls,可以看到多了 output目录:

[bamboo@localhost hadoop-2.5.0]$ ls

bin etc include input lib libexec output sbin share

[bamboo@localhost hadoop-2.5.0]$ cat output/*

1 dfsadmin

测试一个统计字符的

mkdir wcinput

vim wcinput

hadoop yarn

hadoop mapreduce

hadoop hdfs

yarn nodemanager

hadoop resourcemanager

然后启动 hadoop:

[bamboo@localhost hadoop-2.5.0]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount wcinput wcoutput

[bamboo@localhost hadoop-2.5.0]$ cat wcoutput/*

hadoop 4

hdfs 1

mapreduce 1

nodemanager 1

resourcemanager 1

yarn 2

[bamboo@localhost hadoop-2.5.0]$ cat wcinput/

cat: wcinput/: Is a directory

[bamboo@localhost hadoop-2.5.0]$ cat wcinput/*

hadoop yarn

hadoop mapreduce

hadoop hdfs

yarn nodemanager

hadoop resourcemanager