1. Environmental preparation:

A linux machine can be a virtual machine installed by local VMware or a real linux machine.

2. Preparation of installation package

1. jdk installation package Download address: https://www.oracle.com/java/technologies/javase-jdk8-downloads.html Recommended version: jdk8 and above
2. hadopp installation package Download address http://archive.apache.org/dist/hadoop/core/ Recommended version: 2.7.2

3. Perform installation

1. Upload files

1. Create a new directory on linux / opt/software, / opt/module
2. Upload jdk installation package and hadoop installation package

2. install jdk

1. Extract the jdk package to the / opt/module directory

[root@hadoop101 software]# tar -zxvf jdk-8u144-linux-x64.tar.gz -C /opt/module/

1. Configure jdk environment variables
   First obtain the path of the JDK decompression. In this example, the path of decompression is: / opt/module/jdk1.8.0_144 Then use the command vim /etc/profile to open the / etc/profile file Add the following at the end of the / etc/profile file

#Java home configuration
export JAVA_HOME=/opt/module/jdk1.8.0_144
export PATH=$PATH:$JAVA_HOME/bin

Save after modification exit
3. Make environment variable configuration effective Execute command: source /etc/profile 4. Verify that the installation is successful Enter the command java -version, and the result is as follows: JDK is installed successfully

[root@hadoop101 software]# java -version
openjdk version "1.8.0_222-ea"
OpenJDK Runtime Environment (build 1.8.0_222-ea-b03)
OpenJDK 64-Bit Server VM (build 25.222-b03, mixed mode)
[root@hadoop101 software]# 

3. Install hadoop

1. Extract the installation package to the / opt/module directory

[root@hadoop101 software]#  tar -zxvf hadoop-2.7.2.tar.gz -C /opt/module/

1. Configure environment variables First get the path of the jdk decompression. In this example, the path of decompression is: / opt/module/hadoop-2.7.2 Then use the command vim /etc/profile to open the / etc/profile file Add the following at the end of the / etc/profile file

##Hadoop? Home configuration
export HADOOP_HOME=/opt/module/hadoop-2.7.2
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin

Save after modification exit
3. Make environment variable configuration effective Execute command: source /etc/profile
4. Verify that the installation is successful Enter the command hadoop version, and the result is as follows: HADOOP installation succeeded

[root@hadoop101 software]# hadoop version
Hadoop 2.7.2
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r b165c4fe8a74265c792ce23f546c64604acf0e41
Compiled by jenkins on 2016-01-26T00:08Z
Compiled with protoc 2.5.0
From source with checksum d0fda26633fa762bff87ec759ebe689c
This command was run using /opt/module/hadoop-2.7.2/share/hadoop/common/hadoop-common-2.7.2.jar
[root@hadoop101 software]# 

4. HADOOP directory structure description

The structure of hadoop directory after installation is as follows:

[root@hadoop101 hadoop-2.7.2]# pwd
/opt/module/hadoop-2.7.2
[root@hadoop101 hadoop-2.7.2]# ll
total 32
drwxr-xr-x. 2 10011 10011   194 Jan 26  2016 bin
drwxr-xr-x. 3 10011 10011    20 Jan 26  2016 etc
drwxr-xr-x. 2 10011 10011   106 Jan 26  2016 include
drwxr-xr-x. 3 10011 10011    20 Jan 26  2016 lib
drwxr-xr-x. 2 10011 10011   239 Jan 26  2016 libexec
-rw-r--r--. 1 10011 10011 15429 Jan 26  2016 LICENSE.txt
-rw-r--r--. 1 10011 10011   101 Jan 26  2016 NOTICE.txt
-rw-r--r--. 1 10011 10011  1366 Jan 26  2016 README.txt
drwxr-xr-x. 2 10011 10011  4096 Jan 26  2016 sbin
drwxr-xr-x. 4 10011 10011    31 Jan 26  2016 share
[root@hadoop101 hadoop-2.7.2]# 

In this way, the installation of hadoop is completed, which can be said to be very simple. Next, you can modify the configuration file to make hadoop run.