本系列介紹安裝Hadoop 2.2.0 single node。

本文介紹的是HDFS的超級使用者hduser的建立過程，HDFS的設計讓啟動namenode的使用者成為超級使用者。

首先準備一個虛擬機器，Ubuntu 12.04.4

Java環境：

[email protected]:~# mvn --version
Apache Maven 3.1.1 (0728685237757ffbf44136acec0402957f723d9a; 2013-09-17 15:22:22+0000)
Maven home: /usr/apache-maven-3.1.1
Java version: 1.7.0_51, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-oracle/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.2.0-59-virtual", arch: "amd64", family: "unix"
 

建立hadoop的使用者以及組， 組hadoop, 使用者名稱hduser, 密碼hduser

[email protected]:~# addgroup hadoop
Adding group `hadoop' (GID 1001) ...
Done.
[email protected]:~# adduser --ingroup hadoop hduser
Adding user `hduser' ...
Adding new user `hduser' (1001) with group `hadoop' ...
Creating home directory `/home/hduser' ...
Copying files from `/etc/skel' ...
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
Changing the user information for hduser
Enter the new value, or press ENTER for the default
	Full Name []: 
	Room Number []: 
	Work Phone []: 
	Home Phone []: 
	Other []: 
Is the information correct? [Y/n] y
 

[email protected]:~# adduser hduser sudo
Adding user `hduser' to group `sudo' ...
Adding user hduser to group sudo
Done.

為了防止以後用hduser使用sudo時候遇到如下錯誤：

hduser is not in the sudoers file.  This incident will be reported.

# Uncomment to allow members of group sudo to not need a password
# %sudo ALL=NOPASSWD: ALL
hduser ALL=(ALL) ALL
 

退出root使用者，用hduser登入。

ssh [email protected]

[email protected]:~$ ssh-keygen -t rsa -P ''
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hduser/.ssh/id_rsa): 
Created directory '/home/hduser/.ssh'.
Your identification has been saved in /home/hduser/.ssh/id_rsa.
Your public key has been saved in /home/hduser/.ssh/id_rsa.pub.
The key fingerprint is:
b8:b6:3d:c2:24:1f:7b:a3:00:88:72:86:76:5a:d8:c2 [email protected]
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|                 |
|ooo    .         |
|=E++  . S        |
|oo=.. o.         |
| .  .=oo         |
|     o=o+        |
|      o+.o       |
+-----------------+
[email protected]:~$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
[email protected]:~$ ssh localhost
The authenticity of host 'localhost (127.0.0.1)' can't be established.
ECDSA key fingerprint is fb:a8:6c:4c:51:57:b2:6d:36:b2:9c:62:94:30:40:a7.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 12.04.4 LTS (GNU/Linux 3.2.0-59-virtual x86_64)

 * Documentation:  https://help.ubuntu.com/
Last login: Fri Feb 21 07:59:05 2014 from 192.168.1.5

$ cd ~
$ wget http://www.trieuvan.com/apache/hadoop/common/hadoop-2.2.0/hadoop-2.2.0.tar.gz
$ sudo tar vxzf hadoop-2.2.0.tar.gz -C /usr/local
$ cd /usr/local
$ sudo mv hadoop-2.2.0 hadoop
$ sudo chown -R hduser:hadoop hadoop