hadoop分布式集群搭建

hadoop版本：hadoop-0.20.205.0-1.i386.rpm 
下载地址：http://www.fayea.com/apache-mirror/hadoop/common/hadoop-0.20.205.0/
jdk版本：jdk-6u35-linux-i586-rpm.bin  

下载地址：http://www.oracle.com/technetwork/java/javase/downloads/jdk6u35-downloads-1836443.html

 

环境为redhat6.2 32bit
master: 192.169.1.133
slave1: 192.169.1.134
slave2: 192.169.1.135

总体的步骤：
1.修改主机名/etc/hosts（虚拟机拷贝后若不一致要从新修改，从新分发）
2.创建一个普通账户（hadoop），hadoop以此账户运行。
2.root安装jdk
3.修改环境变量
4.安装hadoop，修改配置文件
5.将虚拟机拷贝2份，分别作为slave1，slave2
6.配置ssh，使两两之间，自己登陆自己都免密码
7.用普通账户格式化namenode
8.启动，并观察是否正常运行了


注意两个错误：
1.Warning: $HADOOP_HOME is deprecated. 关闭
解决方法：将export HADOOP_HOME_WARN_SUPPRESS=TRUE添加到每个节点的/etc/hadoop/hadoop-env.sh配置文件中。
2.提示不能创建虚拟机错误
#[root@master ~]# /usr/bin/start-all.sh 
namenode running as process 26878. Stop it first.
slave2: starting datanode, logging to /var/log/hadoop/root/hadoop-root-datanode-slave2.out
slave1: starting datanode, logging to /var/log/hadoop/root/hadoop-root-datanode-slave1.out
slave2: Unrecognized option: -jvm
slave2: Could not create the Java virtual machine.
slave1: Unrecognized option: -jvm
slave1: Could not create the Java virtual machine.
master: secondarynamenode running as process 26009. Stop it first.
jobtracker running as process 25461. Stop it first.
slave2: starting tasktracker, logging to /var/log/hadoop/root/hadoop-root-tasktracker-slave2.out
slave1: starting tasktracker, logging to /var/log/hadoop/root/hadoop-root-tasktracker-slave1.out

解决方法：root不能启动hadoop，需要用普通账户启动。

------------------------1.设置主机ip地址映射/etc/hosts-----------------------------  ------------------------2.添加hadoop用户，作为运行hadoop的用户---------------------  ------------------------3.安装jdk并设置环境变量------------------------------------    [chen@master 桌面]$ su - root  密码：  [root@master ~]# useradd hadoop  [root@master ~]# passwd hadoop  更改用户 hadoop 的密码 。  新的 密码：  无效的密码： 过短  无效的密码： 过于简单  重新输入新的 密码：  passwd： 所有的身份验证令牌已经成功更新。  [root@master ~]# vim /etc/hosts  [root@master ~]# cat /etc/hosts  192.169.1.133 master  192.169.1.134 slave1  192.169.1.135 slave2  [root@master ~]# cd /home/chen/  [root@master chen]# ls  hadoop-0.20.205.0-1.i386.rpm  公共的  视频  文档  音乐  jdk-6u35-linux-i586-rpm.bin   模板    图片  下载  桌面  [root@master chen]# chmod 744 jdk-6u35-linux-i586-rpm.bin  #给bin执行权限  [root@master chen]# ./jdk-6u35-linux-i586-rpm.bin   Unpacking...  Checksumming...  Extracting...  UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu).    inflating: jdk-6u35-linux-i586.rpm      inflating: sun-javadb-common-10.6.2-1.1.i386.rpm      inflating: sun-javadb-core-10.6.2-1.1.i386.rpm      inflating: sun-javadb-client-10.6.2-1.1.i386.rpm      inflating: sun-javadb-demo-10.6.2-1.1.i386.rpm      inflating: sun-javadb-docs-10.6.2-1.1.i386.rpm      inflating: sun-javadb-javadoc-10.6.2-1.1.i386.rpm    Preparing...                ########################################### [100%]     1:jdk                    ########################################### [100%]  Unpacking JAR files...   rt.jar...   jsse.jar...   charsets.jar...   tools.jar...   localedata.jar...   plugin.jar...   javaws.jar...   deploy.jar...  Installing JavaDB  Preparing...                ########################################### [100%]     1:sun-javadb-common      ########################################### [ 17%]     2:sun-javadb-core        ########################################### [ 33%]     3:sun-javadb-client      ########################################### [ 50%]     4:sun-javadb-demo        ########################################### [ 67%]     5:sun-javadb-docs        ########################################### [ 83%]     6:sun-javadb-javadoc     ########################################### [100%]    Java(TM) SE Development Kit 6 successfully installed.    Product Registration is FREE and includes many benefits:  * Notification of new versions, patches, and updates  * Special offers on Oracle products, services and training  * Access to early releases and documentation    Product and system data will be collected. If your configuration  supports a browser, the JDK Product Registration form will  be presented. If you do not register, none of this information  will be saved. You may also register your JDK later by  opening the register.html file (located in the JDK installation  directory) in a browser.    For more information on what data Registration collects and   how it is managed and used, see:  http://java.sun.com/javase/registration/JDKRegistrationPrivacy.html    Press Enter to continue.....       Done.  [root@master chen]# vim /etc/profile  [root@master chen]# ls /usr/java/jdk1.6.0_35/  bin        lib          register.html        THIRDPARTYLICENSEREADME.txt  COPYRIGHT  LICENSE      register_ja.html  include    man          register_zh_CN.html  jre        README.html  src.zip  [root@master chen]# tail -3 /etc/profile #设置环境变量  export JAVA_HOME=/usr/java/jdk1.6.0_35  export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib  export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH  [root@master chen]#     -----------------------安装hadoop，修改配置文件-----------------------  #这一步完后后，将虚拟机拷贝两份，分别作为slave1，slave2  #若启动两个拷贝后，ip地址和hosts不一样，要改为实际的ip    [root@master chen]# ls  hadoop-0.20.205.0-1.i386.rpm            公共的  jdk-6u35-linux-i586.rpm                 模板  jdk-6u35-linux-i586-rpm.bin             视频  sun-javadb-client-10.6.2-1.1.i386.rpm   图片  sun-javadb-common-10.6.2-1.1.i386.rpm   文档  sun-javadb-core-10.6.2-1.1.i386.rpm     下载  sun-javadb-demo-10.6.2-1.1.i386.rpm     音乐  sun-javadb-docs-10.6.2-1.1.i386.rpm     桌面  sun-javadb-javadoc-10.6.2-1.1.i386.rpm  [root@master chen]# rpm -ivh hadoop-0.20.205.0-1.i386.rpm   Preparing...                ########################################### [100%]     1:hadoop                 ########################################### [100%]  [root@master chen]# cd /etc/hadoop/  [root@master hadoop]# ls  capacity-scheduler.xml      hadoop-policy.xml      slaves  configuration.xsl           hdfs-site.xml          ssl-client.xml.example  core-site.xml               log4j.properties       ssl-server.xml.example  fair-scheduler.xml          mapred-queue-acls.xml  taskcontroller.cfg  hadoop-env.sh               mapred-site.xml  hadoop-metrics2.properties  masters  [root@master hadoop]# vim hadoop-env.sh     export JAVA_HOME=/usr/java/jdk1.6.0_35    [root@master hadoop]# vim core-site.xml   [root@master hadoop]# cat core-site.xml   <?xml version="1.0"?>  <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>    <!-- Put site-specific property overrides in this file. -->    <configuration>  <property>  <name>fs.default.name</name>  <value>hdfs://master:9000</value>  </property>  </configuration>    [root@master hadoop]# vim hdfs-site.xml   [root@master hadoop]# cat hdfs-site.xml   <?xml version="1.0"?>  <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>    <!-- Put site-specific property overrides in this file. -->    <configuration>  <property>    <name>dfs.replication</name>    <value>2</value>    </property>  </configuration>    [root@master hadoop]# vim mapred-site.xml   [root@master hadoop]# cat mapred-site.xml   <?xml version="1.0"?>  <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>    <!-- Put site-specific property overrides in this file. -->    <configuration>  <property>    <name>mapred.job.tracker</name>    <value>hdfs://master:9001</value>    </property>  </configuration>  [root@master hadoop]# cat masters   master  [root@master hadoop]# cat slaves   slave1  slave2  [root@master hadoop]#       ------------------------下面切换到hadoop用户，设置ssh免密码登陆------------------------------    [hadoop@master ~]$ ssh-keygen -t dsa #这个步骤在两个从节点上也要做一遍  Generating public/private dsa key pair.  Enter file in which to save the key (/home/hadoop/.ssh/id_dsa):   Created directory '/home/hadoop/.ssh'.  Enter passphrase (empty for no passphrase):   Enter same passphrase again:   Your identification has been saved in /home/hadoop/.ssh/id_dsa.  Your public key has been saved in /home/hadoop/.ssh/id_dsa.pub.  The key fingerprint is:  6f:88:68:8a:d6:c7:b0:c7:e2:8b:b7:fa:7b:b4:a1:56 hadoop@master  The key's randomart image is:  +--[ DSA 1024]----+  |                 |  |                 |  |                 |  |                 |  |        S        |  |   . E . o       |  |  . @ + . o      |  | o.X B   .       |  |ooB*O            |  +-----------------+  [hadoop@master ~]$ cd .ssh/  [hadoop@master .ssh]$ ls  id_dsa  id_dsa.pub  [hadoop@master .ssh]$ cp id_dsa.pub authorized_keys #必须要将公钥改名为authorized_keys    #编辑authorized_keys文件，将两个从节点中生成的公钥id_dsa.pub中的内容拷贝到authorized_keys中  [hadoop@master .ssh]$ vim authorized_keys    [hadoop@master .ssh]$ exit  logout  [chen@master .ssh]$ su - root  密码：  [root@master ~]# cd /home/hadoop/  [root@master hadoop]# ls  [root@master hadoop]# cd .ssh/  [root@master .ssh]# ls  authorized_keys  id_dsa  id_dsa.pub     #切换到root，将authorized_keys分别拷贝到两个从节点的/home/hadoop/.ssh下  #这里root拷贝的时候不需要输入密码，因为之前也被我设置免密码了  [root@master .ssh]# scp authorized_keys slave1:/home/hadoop/.ssh/  authorized_keys                                                100% 1602     1.6KB/s   00:00      [root@master .ssh]# scp authorized_keys slave2:/home/hadoop/.ssh/  authorized_keys                                                100% 1602     1.6KB/s   00:00      [root@master .ssh]#    #这样拷贝完后，三台机用hadoop用户ssh登陆就不需要密码了，  #注意，第一次登陆需要，然后再登陆就不需要了，一定要两两之间  #自己登陆自己都走一遍      -------------------------------格式化并启动hadoop---------------------------  #注意：把三台机的防火墙都关掉测试。  [hadoop@master ~]$ /usr/bin/hadoop namenode -format  12/09/01 16:52:24 INFO namenode.NameNode: STARTUP_MSG:   /************************************************************  STARTUP_MSG: Starting NameNode  STARTUP_MSG:   host = master/192.169.1.133  STARTUP_MSG:   args = [-format]  STARTUP_MSG:   version = 0.20.205.0  STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-205 -r 1179940; compiled by 'hortonfo' on Fri Oct  7 06:19:16 UTC 2011  ************************************************************/  12/09/01 16:52:24 INFO util.GSet: VM type       = 32-bit  12/09/01 16:52:24 INFO util.GSet: 2% max memory = 2.475 MB  12/09/01 16:52:24 INFO util.GSet: capacity      = 2^19 = 524288 entries  12/09/01 16:52:24 INFO util.GSet: recommended=524288, actual=524288  12/09/01 16:52:24 INFO namenode.FSNamesystem: fsOwner=hadoop  12/09/01 16:52:24 INFO namenode.FSNamesystem: supergroup=supergroup  12/09/01 16:52:24 INFO namenode.FSNamesystem: isPermissionEnabled=true  12/09/01 16:52:24 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100  12/09/01 16:52:24 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)  12/09/01 16:52:24 INFO namenode.NameNode: Caching file names occuring more than 10 times   12/09/01 16:52:24 INFO common.Storage: Image file of size 112 saved in 0 seconds.  12/09/01 16:52:25 INFO common.Storage: Storage directory /tmp/hadoop-hadoop/dfs/name has been successfully formatted.  12/09/01 16:52:25 INFO namenode.NameNode: SHUTDOWN_MSG:   /************************************************************  SHUTDOWN_MSG: Shutting down NameNode at master/192.169.1.133  ************************************************************/  [hadoop@master ~]$ /usr/bin/start-all.sh #启动信息像下面这样就正常启动了  starting namenode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-namenode-master.out  slave2: starting datanode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-datanode-slave2.out  slave1: starting datanode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-datanode-slave1.out  master: starting secondarynamenode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-secondarynamenode-master.out  starting jobtracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-jobtracker-master.out  slave2: starting tasktracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-tasktracker-slave2.out  slave1: starting tasktracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-tasktracker-slave1.out  #但是通过查看java的进程信息查不到，可能原因有两个：  #1.防火墙没关  #2.若防火墙关了还这样，重启。  [hadoop@master ~]$ /usr/java/jdk1.6.0_35/bin/jps   28499 Jps  [root@master ~]# iptables -F  [root@master ~]# exit  logout  [hadoop@master ~]$ /usr/bin/start-all.sh   starting namenode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-namenode-master.out  slave2: starting datanode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-datanode-slave2.out  slave1: starting datanode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-datanode-slave1.out  master: starting secondarynamenode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-secondarynamenode-master.out  starting jobtracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-jobtracker-master.out  slave2: starting tasktracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-tasktracker-slave2.out  slave1: starting tasktracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-tasktracker-slave1.out  [hadoop@master ~]$ /usr/java/jdk1.6.0_35/bin/jps   30630 Jps  ---------------------------重启后正常了----------------------  ------------------------master节点---------------------------  [hadoop@master ~]$ /usr/bin/start-all.sh   starting namenode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-namenode-master.out  slave2: starting datanode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-datanode-slave2.out  slave1: starting datanode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-datanode-slave1.out  master: starting secondarynamenode, logging to /var/log/hadoop/hadoop/hadoop-hadoop-secondarynamenode-master.out  starting jobtracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-jobtracker-master.out  slave2: starting tasktracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-tasktracker-slave2.out  slave1: starting tasktracker, logging to /var/log/hadoop/hadoop/hadoop-hadoop-tasktracker-slave1.out  [hadoop@master ~]$ /usr/java/jdk1.6.0_35/bin/jps   3388 JobTracker  3312 SecondaryNameNode  3159 NameNode  3533 Jps    ------------------------salve1---------------------------------    [hadoop@master ~]$ ssh slave1  Last login: Sat Sep  1 16:51:48 2012 from slave2  [hadoop@slave1 ~]$ su - root  密码：  [root@slave1 ~]# iptables -F  [root@slave1 ~]# setenforce 0  [root@slave1 ~]# exit  logout  [hadoop@slave1 ~]$ /usr/java/jdk1.6.0_35/bin/jps   3181 TaskTracker  3107 DataNode  3227 Jps    --------------------------slave2------------------------------  [hadoop@master ~]$ ssh slave2  Last login: Sat Sep  1 16:52:02 2012 from slave2  [hadoop@slave2 ~]$ su - root  密码：  [root@slave2 ~]# iptables -F  [root@slave2 ~]# setenforce 0  [root@slave2 ~]# exit  logout  [hadoop@slave2 ~]$ /usr/java/jdk1.6.0_35/bin/jps   3165 DataNode  3297 Jps  3241 TaskTracker  [hadoop@slave2 ~]$