"Hadoop" Installation and configuration

Actually, it's just homework.

1. Unzip the JDK

2. Configuring the JDK Environment

Normal user rights input Gedit ~/.BASHRC

Enter the JDK directory on the first line, because the JDK cannot be found when you install the configuration to the rear Hadoop

Super Administrator rights input gedit ~/.BASHRC Configure the path at the bottom of the document

Last save exit, terminal input source ~/.BASHRC execution

Sudoupdate-alternatives--install/usr Jdk1.8.0_60/bin/java Java/usr/jdk/jdk1.8.0_60/bin/java 300

Sudoupdate-alternatives--install/usr/jdk1.8.0_60/bin/javac Javac/usr//jdk1.8.0_60/bin/javac 300

Installing SSH

SSH password is ZJH

Generate SSH key, use ssh localhost next time without entering password

Unzip Hadoop

Configuration file error, error message, value tag in source Hdfs-site.xml file

Start the service

Detect if the service is started

It's so much fun to see this page.

Experimental results or conclusions

1, in the course of the experiment because the version of the different, looking at the contents of the document can not be successful, you must find a variety of data to be configured, especially the configuration of the JDK, 1.6 1.7 1.8 Configuration Some small access

JDK 1.8 To make a soft connection

Sudoupdate-alternatives--install/usr Jdk1.8.0_60/bin/java Java/usr/jdk/jdk1.8.0_60/bin/java 300

Sudoupdate-alternatives--install/usr/jdk1.8.0_60/bin/javac Javac/usr//jdk1.8.0_60/bin/javac 300

2, in the installation if just blindly follow the steps to install, there is no significance of the experiment, because it can not learn anything at all

3, finally in the configuration of Hadoop because of some small negligence on the wrong, fortunately there are error messages

4, the last direct use./sbin/start-all.sh can turn on connected services

5, when the following error message (information forgotten, the Internet to find the same information)

[Email protected]:/usr/hadoop-1.1.2/bin$ start-all.sh
Mkdir:cannot Create directory '/usr/hadoop-1.1.2/libexec/. /logs ': Permission denied
Chown:cannot Access '/usr/hadoop-1.1.2/libexec/. /logs ': No such file or directory

Starting Namenode, logging to/usr/hadoop-1.1.2/libexec/. /logs/hadoop-hm-namenode-hm-ubuntu.out
/usr/hadoop-1.1.2/bin/hadoop-daemon.sh:line 136:/usr/hadoop-1.1.2/libexec/. /logs/hadoop-hm-namenode-hm-ubuntu.out:no such file or directory
Head:cannot Open '/usr/hadoop-1.1.2/libexec/. /logs/hadoop-hm-namenode-hm-ubuntu.out ' for reading:no such file or directory
[email protected] ' s password:

Indicates that the user does not have permission to manipulate the directory

Execute the chown command to give the current user writable permissions to the directory

sudochown-hrhmhadoop-1.1.2

6. Enter localhost:8088 into Hadoop management on the webpage

"Hadoop" Installation and configuration