轻松搭建hadoop-1.2.1伪分布

轻松搭建hadoop-1.2.1伪分布

 

以CentOS为例:

 

CentOS虚拟机安装:http://blog.csdn.net/baolibin528/article/details/32918565

网络设置:http://blog.csdn.net/baolibin528/article/details/43797107

PieTTY用法:http://blog.csdn.net/baolibin528/article/details/43822509

WinSCP用法:http://blog.csdn.net/baolibin528/article/details/43819289

 

只要把虚拟系统装好之后,一切就可以用软件远程操作它。

 

1、设置IP

   配置伪分布只在一台机器上运行,因此用 localhost 代替 IP 地址也可以。

   如果要用远程工具(PieTTY、WinSCP等)连接 Linux,那就必须要设置 IP 地址。

在装系统的时候就可以顺便把IP地址配好。

如果现配执行命令: service  network restart   //重启网络

                                ifconfig             //查看IP 信息

 

[root@baolibin ~]# ifconfig
eth0      Linkencap:Ethernet  HWaddr 00:0C:29:44:A3:A5
          inetaddr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe44:a3a5/64 Scope:Link
          UP BROADCAST RUNNINGMULTICAST  MTU:1500  Metric:1
          RX packets:97040errors:0 dropped:0 overruns:0 frame:0
          TX packets:10935errors:0 dropped:0 overruns:0 carrier:0
          collisions:0txqueuelen:1000
          RX bytes:141600363(135.0 MiB)  TX bytes:1033124 (1008.9KiB)
 
lo        Link encap:LocalLoopback
          inetaddr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128Scope:Host
          UP LOOPBACKRUNNING  MTU:16436  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0frame:0
          TX packets:16errors:0 dropped:0 overruns:0 carrier:0
          collisions:0txqueuelen:0
          RX bytes:1184 (1.1KiB)  TX bytes:1184 (1.1 KiB)


 

2、关闭防火墙

执行命令: service  iptables  stop

验证:       service  iptables status

上面那个命令执行完之后,再次开机防火墙还会打开。

永久关闭防火墙:   chkconfig  iptables off

验证:             chkconfig  --list |  grep  iptables

     

[root@baolibin~]# chkconfig --list | grep iptables
iptables        0:关闭  1:关闭 2:关闭  3:关闭  4:关闭 5:关闭  6:关闭


 

3、设置主机名:

命令1:  hostname 主机名

这个命令是暂时修改主机名,重启后无效。下面这个命令是永久修改主机名。

命令2: vim  /etc/sysconfig/network

 

NETWORKING=yes
HOSTNAME=baolibin
GATEWAY=192.168.1.1


 

4、IP与hostname 绑定:

命令: vim  /etc/hosts

 

127.0.0.1   localhost localhost.localdomain localhost4localhost4.localdomain4
::1         localhost localhost.localdomainlocalhost6 localhost6.localdomain6
192.168.1.100  baolibin


 

5、设置SSH免密码登陆:

执行命令:   ssh-keygen -t rsa -P ''

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

chmod 600~/.ssh/authorized_keys

 

[root@baolibin~]# ssh 192.168.1.100
Last login: SunFeb 15 21:01:30 2015 from baolibin
[root@baolibin~]#


 

6、安装JDK:

给JDK安装赋予可执行权限: chmodu+x jdk-6u45-linux-x64.bin

解压JDK :   ./jdk-6u45-linux-x64.bin

给解压的文件夹改名:  mv jdk1.6.0_45jdk

修改权限:    chown -R hadoop:hadoop jdk

 

在/etc/profile 文件中添加:

#set java environment
export JAVA_HOME=/usr/local/jdk
export JRE_HOME=/usr/local/jdk/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH


 

[root@baolibinlocal]# vim /etc/profile
[root@baolibinlocal]# source /etc/profile
[root@baolibinlocal]# java -version
java version"1.6.0_45"
Java(TM) SERuntime Environment (build 1.6.0_45-b06)
JavaHotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)
[root@baolibinlocal]#


 

 

7、安装Hadoop:

 

解压hadoop: tar -zxvf hadoop-1.2.1.tar.gz

 

修改权限:   chown -R hadoop:hadoop hadoop-1.2.1

 

重命名:    mv hadoop-1.2.1hadoop

 

编辑 :   vim /etc/profile

 

   #sethadoop environment
export HADOOP_HOME=/usr/hadoop
export PATH=$PATH:$HADOOP_HOME/bin


 

source /etc/profile

 

修改conf目录下的配置文件hadoop-env.sh、core-site.xml、hdfs-site.xml、mapred-site.xml

hadoop-env.sh:

 

export JAVA_HOME=/usr/local/jdk

 

core-site.xml:

 

<configuration>
   <property>
           <name>fs.default.name</name>
           <value>hdfs://192.168.1.100:9000</value>
  </property>
  <property>
           <name>hadoop.tmp.dir</name>
           <value>/home/hadoop/dfs</value>
   </property>
</configuration>


注意:之前写的是 <value>/usr/hadoop/tmp</value>  每次使用需要重新格式化,要不然JobTracker过一会会自动消失,改成非tmp目录就正常了。

 

hdfs-site.xml:

 

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


 

mapred-site.xml:

<configuration>
 <property>
       <name>mapred.job.tracker</name>
       <value>192.168.1.100:9001</value>
 </property>
</configuration>


 

 

在conf下再修改 vim masters  和 vim slaves

内容均为192.168.1.100

 

8、格式化:

执行命令:  hadoop namenode -format

 

 

[hadoop@baolibin ~]$ jps
29363 Jps
[hadoop@baolibin ~]$ cd /usr/hadoop/bin
[hadoop@baolibin bin]$ hadoop namenode -format
Warning: $HADOOP_HOME is deprecated.
 
15/02/15 21:04:06 INFO namenode.NameNode:STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = baolibin/192.168.1.100
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 1.2.1
STARTUP_MSG:   build =https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152;compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG:   java = 1.6.0_45
************************************************************/
15/02/15 21:04:06 INFO util.GSet: Computingcapacity for map BlocksMap
15/02/15 21:04:06 INFO util.GSet: VMtype       = 64-bit
15/02/15 21:04:06 INFO util.GSet: 2.0% maxmemory = 1013645312
15/02/15 21:04:06 INFO util.GSet:capacity      = 2^21 = 2097152 entries
15/02/15 21:04:06 INFO util.GSet:recommended=2097152, actual=2097152
15/02/15 21:04:07 INFOnamenode.FSNamesystem: fsOwner=hadoop
15/02/15 21:04:07 INFOnamenode.FSNamesystem: supergroup=supergroup
15/02/15 21:04:07 INFOnamenode.FSNamesystem: isPermissionEnabled=false
15/02/15 21:04:07 INFOnamenode.FSNamesystem: dfs.block.invalidate.limit=100
15/02/15 21:04:07 INFOnamenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0min(s), accessTokenLifetime=0 min(s)
15/02/15 21:04:07 INFO namenode.FSEditLog:dfs.namenode.edits.toleration.length = 0
15/02/15 21:04:07 INFO namenode.NameNode:Caching file names occuring more than 10 times
15/02/15 21:04:08 INFO common.Storage:Image file /usr/hadoop/tmp/dfs/name/current/fsimage of size 112 bytes saved in0 seconds.
15/02/15 21:04:08 INFO namenode.FSEditLog:closing edit log: position=4, editlog=/usr/hadoop/tmp/dfs/name/current/edits
15/02/15 21:04:08 INFO namenode.FSEditLog:close success: truncate to 4, editlog=/usr/hadoop/tmp/dfs/name/current/edits
15/02/15 21:04:08 INFO common.Storage:Storage directory /usr/hadoop/tmp/dfs/name has been successfully formatted.
15/02/15 21:04:08 INFO namenode.NameNode:SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode atbaolibin/192.168.1.100
************************************************************/
[hadoop@baolibin bin]$


 

 

9、启动hadoop :

 

执行命令: start-all.sh

 

[hadoop@baolibinbin]$ start-all.sh
Warning:$HADOOP_HOME is deprecated.
 
startingnamenode, logging to/usr/hadoop/libexec/../logs/hadoop-hadoop-namenode-baolibin.out
192.168.1.100:starting datanode, logging to/usr/hadoop/libexec/../logs/hadoop-hadoop-datanode-baolibin.out
192.168.1.100:starting secondarynamenode, logging to/usr/hadoop/libexec/../logs/hadoop-hadoop-secondarynamenode-baolibin.out
startingjobtracker, logging to/usr/hadoop/libexec/../logs/hadoop-hadoop-jobtracker-baolibin.out
192.168.1.100:starting tasktracker, logging to /usr/hadoop/libexec/../logs/hadoop-hadoop-tasktracker-baolibin.out
[hadoop@baolibinbin]$


 

查看进程:

[hadoop@baolibinbin]$ jps
29707SecondaryNameNode
29804JobTracker
29928TaskTracker
29585DataNode
30049 Jps
29470NameNode
[hadoop@baolibinbin]$


 

 

10、在浏览器查看: http://192.168.1.100:50070  http://192.168.1.100:50030

 

用远程软件登录,直接在Windows 网页上打开即可:

 

50070:

轻松搭建hadoop-1.2.1伪分布_第1张图片

 

50030:

轻松搭建hadoop-1.2.1伪分布_第2张图片

 

11、关闭hadoop

执行命令: stop-all.sh

 

[hadoop@baolibinbin]$ stop-all.sh
Warning:$HADOOP_HOME is deprecated.
 
stoppingjobtracker
192.168.1.100:stopping tasktracker
stoppingnamenode
192.168.1.100:stopping datanode
192.168.1.100:stopping secondarynamenode
[hadoop@baolibinbin]$


 

 

12、启动时没有NameNode的可能原因:

       (1)没有格式化

       (2)环境变量设置错误

       (3)ip与hostname绑定失败

 

 

 

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