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sources/tech/20170712 How To Setup Apache Hadoop On CentOS.md
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sources/tech/20170712 How To Setup Apache Hadoop On CentOS.md
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How To Setup Apache Hadoop On CentOS
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============================================================
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[][2]
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The **Apache Hadoop** software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models The Apache™ Hadoop® project develops open-source software for reliable, scalable, distributed computing.
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The project includes these modules:
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* **Hadoop Common**: The common utilities that support the other Hadoop modules.
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* **Hadoop Distributed File System (HDFS™)**: A distributed file system that provides high-throughput access to application data.
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* **Hadoop YARN**: A framework for job scheduling and cluster resource management.
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* **Hadoop MapReduce**: A YARN-based system for parallel processing of large data sets.
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This article will help you for step by step install and configure single node hadoop cluster using Hadoop on centos.
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### Install Java
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Before installing hadoop make sure you have java installed on your system. Use this command to check the version of the installed Java.
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```
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java -version
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java version "1.7.0_75"
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Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
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Java HotSpot(TM) 64-Bit Server VM (build 24.75-b04, mixed mode)
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```
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To install or update Java use following step by step instructions.
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First step is to download latest version of java from the [Oracle official website][3].
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```
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cd /opt/
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wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz"
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tar xzf jdk-7u79-linux-x64.tar.gz
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```
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Need to set up to use newer version of Java using alternatives. Use the following commands to do it.
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```
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cd /opt/jdk1.7.0_79/
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alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 2
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alternatives --config java
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```
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```
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There are 3 programs which provide 'java'.
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Selection Command
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-----------------------------------------------
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* 1 /opt/jdk1.7.0_60/bin/java
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+ 2 /opt/jdk1.7.0_72/bin/java
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3 /opt/jdk1.7.0_79/bin/java
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Enter to keep the current selection[+], or type selection number: 3 [Press Enter]
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```
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Now you may also required to set up javac and jar commands path using alternatives command.
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```
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alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 2
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alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 2
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alternatives --set jar /opt/jdk1.7.0_79/bin/jar
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alternatives --set javac /opt/jdk1.7.0_79/bin/javac
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```
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The next step is to configure environment variables. Use following commands to set up these variable properly
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* Setup **JAVA_HOME** Variable
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```
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export JAVA_HOME=/opt/jdk1.7.0_79
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```
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* Setup **JRE_HOME** Variable
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```
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export JRE_HOME=/opt/jdk1.7.0_79/jre
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```
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* Setup **PATH** Variable
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```
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export PATH=$PATH:/opt/jdk1.7.0_79/bin:/opt/jdk1.7.0_79/jre/bin
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```
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### Installing **Apache Hadoop**
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After setting up the java environment. Let stat installing **Apache Hadoop.**
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The first step is to create a system user account to use for hadoop installation.
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```
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useradd hadoop
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passwd hadoop
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```
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Now you need to configure the ssh keys for the user hadoop. Using following command to enable ssh login without password.
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```
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su - hadoop
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ssh-keygen -t rsa
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cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
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chmod 0600 ~/.ssh/authorized_keys
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exit
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```
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Now download hadoop latest available version from its official site [hadoop.apache.org][4].
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```
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cd ~
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wget http://apache.claz.org/hadoop/common/hadoop-2.6.0/hadoop-2.6.0.tar.gz
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tar xzf hadoop-2.6.0.tar.gz
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mv hadoop-2.6.0 hadoop
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```
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Now the next step is to set environment variable uses by hadoop.
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Edit **~/.bashrc** file and add the following listes of values at end of file.
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```
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export HADOOP_HOME=/home/hadoop/hadoop
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export HADOOP_INSTALL=$HADOOP_HOME
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export HADOOP_MAPRED_HOME=$HADOOP_HOME
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export HADOOP_COMMON_HOME=$HADOOP_HOME
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export HADOOP_HDFS_HOME=$HADOOP_HOME
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export YARN_HOME=$HADOOP_HOME
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export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
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export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin
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```
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Then apply the changes in current running environment
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```
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source ~/.bashrc
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```
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edit **$HADOOP_HOME/etc/hadoop/hadoop-env.sh** file and set **JAVA_HOME**environment variable
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```
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export JAVA_HOME=/opt/jdk1.7.0_79/
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```
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Now you start with the configuration with basic hadoop single node cluster setup.
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First edit hadoop configuration files and make following changes.
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```
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cd /home/hadoop/hadoop/etc/hadoop
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```
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Let’s start by editing core-site.xml
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```
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<configuration>
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<property>
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<name>fs.default.name</name>
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<value>hdfs://localhost:9000</value>
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</property>
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</configuration>
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```
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Then Edit hdfs-site.xml:
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```
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<configuration>
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<property>
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<name>dfs.replication</name>
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<value>1</value>
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</property>
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<property>
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<name>dfs.name.dir</name>
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<value>file:///home/hadoop/hadoopdata/hdfs/namenode</value>
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</property>
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<property>
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<name>dfs.data.dir</name>
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<value>file:///home/hadoop/hadoopdata/hdfs/datanode</value>
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</property>
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</configuration>
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```
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and edit mapred-site.xml:
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```
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<configuration>
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<property>
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<name>mapreduce.framework.name</name>
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<value>yarn</value>
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</property>
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</configuration>
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```
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finally edit yarn-site.xml:
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```
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<configuration>
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<property>
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<name>yarn.nodemanager.aux-services</name>
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<value>mapreduce_shuffle</value>
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</property>
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</configuration>
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```
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Now format the namenode using following command:
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```
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hdfs namenode -format
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```
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To start all hadoop services use the following command:
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```
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cd /home/hadoop/hadoop/sbin/
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start-dfs.sh
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start-yarn.sh
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```
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To check if all services are started well use ‘jps‘ command:
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```
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jps
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```
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You should see like this output.
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```
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26049 SecondaryNameNode
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25929 DataNode
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26399 Jps
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26129 JobTracker
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26249 TaskTracker
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25807 NameNode
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```
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Now you can access to Hadoop Services in your Browser at: **http://your-ip-address:8088/.**
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[][5]
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Thanks!!!
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--------------------------------------------------------------------------------
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via: https://www.unixmen.com/setup-apache-hadoop-centos/
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作者：[anismaj ][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.unixmen.com/author/anis/
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[1]:https://www.unixmen.com/author/anis/
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[2]:https://www.unixmen.com/wp-content/uploads/2015/06/hadoop1.png
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[3]:http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
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[4]:https://hadoop.apache.org/
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[5]:http://www.unixmen.com/wp-content/uploads/2015/06/hadoop.png
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