轻松搭建hadoop-1.2.1伪分布，搭建hadoop-1.2.1
轻松搭建hadoop-1.2.1伪分布，搭建hadoop-1.2.1
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:$HADOOP_HOME/bin
source /etc/profile
修改conf目录下的配置文件hadoop-env.sh、core-site.xml、hdfs-site.xml、mapred-site.xml
hadoop-env.sh：
export JAVA_HOME=/usr/local/jdk
core-site.xml：
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://192.168.1.100:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/hadoop/tmp</value>
</property>
</configuration>
hdfs-site.xml：
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
</configuration>
mapred-site.xml：
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>192.168.1.100:9001</value>
</property>
</configuration>
在conf下再修改 vim masters 和 vim slaves
内容均为192.168.1.100
8、格式化：
执行命令： hadoop namenode -format
[hadoop@baolibin ~]$ 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：
50030：
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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