hadoop

一、hadoop单机版测试

建立用户,设置密码
[root@server1 ~]# useradd -u 1000 hadoop
[root@server1 ~]# passwd hadoop

hadoop的安装配置
##切换到hadoop用户解压安装包
Hadoop是Java开发的,因此需要在服务器上安装相对应的jdk

将hadoop相关安装包都放在hadoop用户家目录下
[root@server1 ~]# mv hadoop-3.0.3.tar.gz jdk-8u181-linux-x64.tar.gz /home/hadoop
[root@server1 ~]# su - hadoop
[hadoop@server1 ~]$ ls
hadoop-3.0.3.tar.gz jdk-8u181-linux-x64.tar.gz

解压并做软连接
[hadoop@server1 ~]$ tar zxf jdk-8u181-linux-x64.tar.gz
[hadoop@server1 ~]$ ln -s jdk1.8.0_181/ java
[hadoop@server1 ~]$ tar zxf hadoop-3.0.3.tar.gz
[hadoop@server1 ~]$ ln -s hadoop-3.0.3 hadoop
[hadoop@server1 ~]$ ls
hadoop hadoop-3.0.3.tar.gz jdk1.8.0_181
hadoop-3.0.3 java jdk-8u181-linux-x64.tar.gz

配置环境变量
[hadoop@server1 hadoop]$ pwd
/home/hadoop/hadoop/etc/hadoop
[hadoop@server1 hadoop]$ vim hadoop-env.sh
54 export JAVA_HOME=/home/hadoop/java

写入java命令绝对路径方便命令使用
[hadoop@server1 ~]$ vim .bash_profile
PATH= P A T H : PATH: PATH:HOME/.local/bin: H O M E / b i n : HOME/bin: HOME/bin:HOME/java/bin
[hadoop@server1 ~]$ source .bash_profile
[hadoop@server1 ~]$ jps ##配置成功可以调用
1540 Jps

测试
[hadoop@server1 hadoop]$ pwd
/home/hadoop/hadoop
[hadoop@server1 hadoop]$ mkdir input
[hadoop@server1 hadoop]$ cp etc/hadoop/*.xml input/

独立操作debug,运行了一个程序
[hadoop@server1 hadoop]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.0.3.jar grep input output ‘dfs[a-z.]+’

[hadoop@server1 hadoop]$ cd output/
[hadoop@server1 output]$ ls
part-r-00000 _SUCCESS
[hadoop@server1 output]$ cat *
1 dfsadmin

二、伪分布式

编辑文件
[hadoop@server1 hadoop]$ pwd
/home/hadoop/hadoop/etc/hadoop

[hadoop@server1 hadoop]$ vim hdfs-site.xml


dfs.replication
1 ##自己充当节点

生成密钥做免密连接,做本机的免密
[hadoop@server1 hadoop]$ ssh-keygen
[hadoop@server1 hadoop]$ ssh-copy-id localhost
[hadoop@server1 ~]$ exit
logout
Connection to localhost closed.

格式化,并开启服务
[hadoop@server1 hadoop]$ bin/hdfs namenode -format
[hadoop@server1 hadoop]$ pwd
/home/hadoop/hadoop
[hadoop@server1 hadoop]$ cd sbin/
[hadoop@server1 sbin]$ ./start-dfs.sh
[hadoop@server1 sbin]$ jps
2675 NameNode
2787 DataNode
3114 Jps
2971 SecondaryNameNode

浏览器查看http://172.25.63.1:9870

测试,创建目录,并上传

未完…待续…

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