hadoop0.20.2伪分布式环境搭建

虽然现在hadoop版本已经到了主流2点多的时代，但是对于学习大数据而言，我还是选择从以前老的版本0.20.2学起。

下面就是伪分布式的环境搭建过程。

hadoop下载地址：

http://archive.apache.org/dist/hadoop/core/hadoop-0.20.2/hadoop-0.20.2.tar.gz

linux系统版本：centos7

1、配置主机名

[root@localhost ~]# vi /etc/sysconfig/network

# Created by anaconda

master1

[root@localhost ~]# hostname master1

2、创建管理hadoop的组和用户

[root@master1 ~]# groupadd hduser

[root@master1 ~]# useradd -g hduser hduser

[root@master1 ~]# passwd hduser

3、hosts主机名ip解析

[root@master1 ~]# vi /etc/hosts

192.168.11.131  master1

4、配置hadoop的sudoers权限

[root@master1 ~]# vi /etc/sudoers

hduser  ALL=(ALL)       NOPASSWD:ALL

5、关闭selinux和防火墙

[root@master1 ~]# vi /etc/sysconfig/selinux

SELINUX=enforcing --> SELINUX=disabled

[root@master1 ~]# systemctl stop firewalld

[root@master1 ~]# systemctl disable firewalld

6、解压包

[root@master1 ~]# su hduser 

[hduser@master1 root]$ cd 

[hduser@master1 ~]$ ll *tar*

-rw-r--r--. 1 root root  44575568 Jun 16 17:24 hadoop-0.20.2.tar.gz

-rw-r--r--. 1 root root 288430080 Mar 16  2016 jdk1.7.0_79.tar

[hduser@master1 ~]$ tar xf jdk1.7.0_79.tar

[hduser@master1 ~]$ tar zxf hadoop-0.20.2.tar.gz

[hduser@master1 ~]$ mv jdk1.7.0_79 jdk

[hduser@master1 ~]$ mv hadoop-0.20.2 hadoop

7、配置java环境

[hduser@master1 ~]$ vi .bashrc 

export JAVA_HOME=/home/hduser/jdk

export JRE_HOME=$JAVA_HOME/jre

export PATH=$PATH:$JAVA_HOME/bin

export CLASSPATH=./:$JAVA_HOME/lib:$JAVA_HOME/jre/lib

[hduser@master1 ~]$ source .bashrc 

[hduser@master1 ~]$ java -version

java version "1.7.0_79"

Java(TM) SE Runtime Environment (build 1.7.0_79-b15)

Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

8、配置hadoop

[hduser@master1 conf]$ pwd

/home/hduser/hadoop/conf

[hduser@master1 conf]$ vi hadoop-env.sh 

export JAVA_HOME=/home/hduser/jdk

[hduser@master1 conf]$ vi core-site.xml 

<configuration>

        <property>

                <name>fs.default.name</name>

                <value>hdfs://master1:9000</value>

        </property>

</configuration>

[hduser@master1 conf]$ sudo mkdir -p /data/hadoop/data

[hduser@master1 conf]$ sudo chown -R hduser:hduser /data/hadoop/data

[hduser@master1 conf]$ vi hdfs-site.xml

<configuration>

        <property>

                <name>dfs.data.dir</name>

                <value>/data/hadoop/data</value>

        </property>

        <property>

                <name>dfs.replication</name>

                <value>1</value>

        </property>

</configuration>

[hduser@master1 conf]$ vi mapred-site.xml 

<configuration>

        <property>

                <name>mapred.job.tracker</name>

                <value>master1:9001</value>

        </property>

</configuration>

9、做无密码认证

[hduser@master1 conf]$ cd

[hduser@master1 ~]$ ssh-keygen -t rsa

Generating public/private rsa key pair.

Enter file in which to save the key (/home/hduser/.ssh/id_rsa): 

Created directory '/home/hduser/.ssh'.

Enter passphrase (empty for no passphrase): 

Enter same passphrase again: 

Your identification has been saved in /home/hduser/.ssh/id_rsa.

Your public key has been saved in /home/hduser/.ssh/id_rsa.pub.

The key fingerprint is:

SHA256:qRJhPSF32QDs9tU3e0/mAx/EBC2MHamGv2WPvUw19/M hduser@master1

The key's randomart image is:

+---[RSA 2048]----+

|    ..+.o+  +o=  |

|     +.o. .. = o |

|    o.o   ... +  |

|   . .o. o.o. oo |

|    .. .S.o  ..+o|

|     . ..  . +..O|

|    . .     + *B+|

|     .     . .o==|

|               oE|

+----[SHA256]-----+

一路enter键

[hduser@master1 ~]$ cd .ssh

[hduser@master1 .ssh]$ ls

id_rsa  id_rsa.pub

[hduser@master1 .ssh]$ cp id_rsa.pub authorized_keys

10、格式化文件系统

[hduser@master1 .ssh]$ cd 

[hduser@master1 ~]$ cd  hadoop/bin

[hduser@master1 bin]$ ./hadoop namenode -format

18/06/19 04:02:12 INFO namenode.NameNode: STARTUP_MSG: 

/************************************************************

STARTUP_MSG: Starting NameNode

STARTUP_MSG:   host = master1/192.168.11.131

STARTUP_MSG:   args = [-format]

STARTUP_MSG:   version = 0.20.2

STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010

************************************************************/

18/06/19 04:02:13 INFO namenode.FSNamesystem: fsOwner=hduser,hduser

18/06/19 04:02:13 INFO namenode.FSNamesystem: supergroup=supergroup

18/06/19 04:02:13 INFO namenode.FSNamesystem: isPermissionEnabled=true

18/06/19 04:02:13 INFO common.Storage: Image file of size 96 saved in 0 seconds.

18/06/19 04:02:13 INFO common.Storage: Storage directory /tmp/hadoop-hduser/dfs/name has been successfully formatted.

18/06/19 04:02:13 INFO namenode.NameNode: SHUTDOWN_MSG: 

/************************************************************

SHUTDOWN_MSG: Shutting down NameNode at master1/192.168.11.131

************************************************************/

11、启动服务

[hduser@master1 bin]$ ./start-all.sh 

starting namenode, logging to /home/hduser/hadoop/bin/../logs/hadoop-hduser-namenode-master1.out

The authenticity of host 'localhost (::1)' can't be established.

ECDSA key fingerprint is SHA256:OXYl4X6F6g4TV7YriZaSvuBIFM840h/qTg8/B7BUil0.

ECDSA key fingerprint is MD5:b6:b6:04:2d:49:70:8b:ed:65:00:e2:05:b0:95:5b:6d.

Are you sure you want to continue connecting (yes/no)? yes

localhost: Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.

localhost: starting datanode, logging to /home/hduser/hadoop/bin/../logs/hadoop-hduser-datanode-master1.out

localhost: starting secondarynamenode, logging to /home/hduser/hadoop/bin/../logs/hadoop-hduser-secondarynamenode-master1.out

starting jobtracker, logging to /home/hduser/hadoop/bin/../logs/hadoop-hduser-jobtracker-master1.out

localhost: starting tasktracker, logging to /home/hduser/hadoop/bin/../logs/hadoop-hduser-tasktracker-master1.out

12、查看服务

[hduser@master1 bin]$ jps

1867 JobTracker

1804 SecondaryNameNode

1597 NameNode

1971 TaskTracker

2011 Jps

1710 DataNode

[hduser@master1 bin]$ 

13、浏览器查看服务状态

使用web查看HSFS运行状态

在浏览器输入