Hadoop pseudo-distributed installation on a Linux host

Source: Internet
Author: User
1. Install JDK

sudo apt-get install openjdk-6-jdk
2. Configure Java environment variables

Enter the following command:

sudo gedit /etc/profile

Open the profile and add the following content at the bottom of the file:

# set java homeexport JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-i386/export CLASSPATH=".:JAVA_HOME/lib:$CLASSPATH"export PATH="$JAVA_HOME:$PATH"

Note that you can add the SDK according to the Java path you have installed.

Ls/usr/lib/JVM/to view the installed JDK path.

Verify that JDK is successfully installed:

java  -version

3. Configure SSH password-free Login

A. Install SSH and enter the following command:

sudo apt-get  install ssh

B. you can log on to the local machine without a password.

Check whether there is a folder. Ssh.

Command:

Ls-L/home/U (your user directory)

C. Create the id_dsa id_dsa.pub file, which is an SSH private key and a public key.

ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa

D. append id_dsa.pub to the authorization key.

cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

D. verify whether the request is successful.

 

ssh localhost

Display
Welcome to Ubuntu 12.10 (GNU/Linux 3.2.0-29-generic-pae i686)

* Documentation: https://help.ubuntu.com/

Last login: Sun Apr 21 11:16:27 2013 from daniel-optiplex-320.local

4. hadoop Installation

A. Download hadoop

Click Open Link

B. Decompress hadoop

tar xzvf hadoop-1.0.4-bin.tar.gz  -C /home/user

Decompress the package to your user directory.

C. Pseudo-distributed hadoop Configuration

Go to the hadoop directory under/home/user.

CD Conf, go to the configuration folder, and modify it.

Modify the JDK file hadoop-env.sh configuration.

export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-i386/

Modify file core-site.xml

<configuration> <property><name>fs.default.name</name><value>hdfs://localhost:9000</value> </property></configuration>

Modify file hdfs-site.xml

<configuration> <property><name>dfs.replication</name><value>1</value> </property></configuration>

Modify file mapred-site.xml

<configuration>  <property><name>mapred.job.tracker</name><value>localhost:9001</value>  </property></configuration>

5. Start hadoop

First, add the hadoop bin directory to the path system environment variable.
 
sudo  vim /etc/profile

Add the following in the last line:

export PATH=/home/user/hadoop-1.0.4/bin/:$PATH

Note that this path is the bin directory path under the hadoop directory after pressurization.
After the modification, enter the following command:

source  /etc/profile

A. format the file system.

Hadoop namenode-format B, start hadoop boot close all services start-all.sh/stop-all.sh start close HDFS: start-dfs.sh/stop-dfs.sh start close mapreduce: start-mapred.sh/stop-mapred.sh C, view processes with JPs command, ensure that namenode, datanode, jobtracker, and tasktracker are available.
You can also use a browser to verify that hadoop is successfully installed.
Mapreduce web page
Http: // localhost: 50030
HDFS web page
Http: // localhost: 50070


If a java. Io. ioexception: Too program open files error occurs when the correct method is to add this line to/etc/security/limits. conf:
-Nofile 8192

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.