Hadoop installation .. Standalone Mode

Hadoop should be installed in linux based system .. it cannot be installed in windows !!

Here i will write down the installation steps i have been done on Ubuntu 14.04 LTS .

you need to install Java before starting installing Hadoop .. you can follow the following link to install Java Wiki How .

i prefer to create separate user for Hadoop .

Open the terminal and do the following steps to install hadoop in ur linux OS .

1. creating hadoop user :
   a- create the user by the following command :
   > sudo useradd hadoop
   > sudo passwd hadoop
   write the password and confirm password .
2. SSH key generation "ensure you have install sshd ,sshd you can run > which ssh and you will get /usr/bin/ssh , /usr/bin/sshd if you have install them properly if not you can run > sudo apt-get install ssh to install them   ":
   a- run the following command to generate the rsa key :
            > ssh-keygen -t rsa
   b- you will be asked about the location of storing this key "i.e. ~/.ssh/authorized_keys "
   c- then give read and write permission for the owner :
             > chmod 0600 ~/.ssh/authorized_keys 


3. Download Hadoop :
   a- Go to apache Hadoop home page
   b- Go to Download page
   c-In download page you will find a link to the releases of Hadoop click on the release you want to install it " the binary package".. it will redirect you to the mirror links page select any link and use it in the following command to download it :
   > sudo wget [ your link "i.e. http://apache.arvixe.com/hadoop/common/hadoop-2.6.0/hadoop-2.6.0.tar.gz "]
   
4. extract the file to /usr/local directory :
   a- copy the downloaded file to /usr/local directory
   b- extract the file by this command 'sudo tar xzf hadoop-.tar.gz'
   c- rename the extracted file from hadoop. to be hadoop :
   > sudo mv hadoop-2.6.0 hadoop
   Note :
   if you got the following error :
      gzip: stdin: not in gzip format
      tar: Child returned status 1
      tar: Error is not recoverable: exiting now
   this mean the download or the copy is not done correctly so redownload the binary file and copy it in /usr/local properly .
5. Define Hadoop in your path environmental variable :
   a- add the following line at the end of the '/.bashrc ' file :
   export PATH=$PATH:/usr/local/hadoop/bin/
6. At this point the installation should be done .. you can check it by running the following command : > hadoop version
   you should got something like :
   hadoop version
   Hadoop 2.6.0
   Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r e3496499ecb8d220fba99dc5ed4c99c8f9e33bb1
   Compiled by jenkins on 2014-11-13T21:10Z
   Compiled with protoc 2.5.0
   From source with checksum 18e43357c8f927c0695f1e9522859d6a
   This command was run using /usr/local/hadoop/share/hadoop/common/hadoop-common-2.6.0.jar

references :

1. http://www.tutorialspoint.com/hadoop/hadoop_enviornment_setup.htm