Ubuntu 12.04 Build Hadoop stand-alone environment __hadoop

At the beginning of November, we learned about Ubuntu 12.04 's way of building a Hadoop cluster environment, and today we'll look at how Ubuntu12.04 builds Hadoop in a stand-alone environment.

A. You want to install Ubuntu this step is omitted;

Two. Create a Hadoop user group and user under Ubuntu;

1. Create a Hadoop user group:

sudo addgroup Hadoop

As shown in figure:

2. Create a Hadoop User:

sudo adduser-ingroup Hadoop Hadoop

As shown in figure:

3. Add permissions to the Hadoop user to open the/etc/sudoers file:

sudo gedit/etc/sudoers

Pressing ENTER will open the/etc/sudoers file, giving the Hadoop user the same permissions as the root user.

Add the Hadoop all= (All:all) all under root all= (All:all) all,

Hadoop all= (All:all) all

As shown in figure:

Three. Install JDK under Ubuntu

Execute with the following command:

sudo apt-get install Openjdk-6-jre

As shown in figure:

Four. Modify Machine name

Every time the Ubuntu installation succeeds, our machine name defaults to: Ubuntu, but in order to be able to easily distinguish the servers in the cluster, we need to give each machine a different names. The machine name is determined by the/etc/hostname file.

1. Open/etc/hostname File:

sudo gedit/etc/hostname

2. Change the Ubuntu in the/etc/hostname file to the name of the machine you want to take. Here I take "Dubin-ubuntu". The system will not take effect until it is restarted.

Five. Install SSH service

SSH here and the three broad framework: Spring,struts,hibernate does not matter, SSH can achieve remote login and management, can refer to other relevant information.

Install Openssh-server,

sudo apt-get install SSH openssh-server

If you have already installed SSH, you can proceed to the sixth step OH

vi. Establishment of SSH password-free login this machine

First to convert to a Hadoop user, execute the following command:

Su-hadoop

As shown in figure:

The SSH generation Key has RSA and DSA two ways of generation, by default, RSA approach.

1. Create Ssh-key, here we use RSA Way:

Ssh-keygen-t rsa-p ""

As shown in figure:

(Note: Two files are generated under ~/.ssh/after a carriage return: Id_rsa and id_rsa.pub These two files appear in pairs)

2. Into the ~/.ssh/directory, the Id_rsa.pub appended to the Authorized_keys authorization file, the beginning is not Authorized_keys file:

CD ~/.ssh Cat Id_rsa.pub >> Authorized_keys

As shown in figure:

(After completion, you can log on to this machine without a password.) ）

3. Login localhost:

SSH localhost

As shown in figure:

(Note: When SSH telnet to another machine, you now control the remote machine, you need to perform an exit command to regain control of the local host.) )

4. Execute Exit Command: