centos6下安裝部署hadoop2.2

環境准備
1、操作系統:centos6.0 64位
2、hadoop版本：hahadoop-2.2.0 

安裝和配置步驟具體如下：
1、主機和ip分配如下
     ip地址                  主機名               用途
     192.168.1.112      hadoop1            namenode
     192.168.1.113      hadoop2            datanode
     192.168.1.114      hadoop3            datanode
     192.168.1.115      hadoop4            datanode
2、四台主機主機名修改如下，僅以hadoop1為例
    1) [root@hadoop1 ~]# hostname hadoop1
    2) [root@hadoop1 ~]# vi /etc/sysconfig/network,修改hostname屬性值保存
3、四台主機都需要安裝jdk
4、關閉防火牆，切換到root用戶  執行如下命令 chkconfig iptables off
5、每台主機配置/etc/hosts 增加ip地址解析
   

    hadoop1 192.168.1.112

    hadoop2 192.168.1.113

    hadoop3 192.168.1.114

    hadoop4 192.168.1.115
 5、配置namenode無密碼訪問datanode
   1) 在namenode機器上，在hadoop用戶下執行下面命令
     ssh-keygen -t rsa 
     遇到所有選項回車默認值即可
   2) 導入公鑰到本機認證文件
      cat ~/.ssh/id_rsa.pub>>~/.ssh/authorized_keys
   3) 導入公鑰到其他datanode節點認證文件
    

參考  http://www.cnblogs.com/zhwl/p/3664178.html

    scp ～/.ssh/authorized_keys hadoop@192.168.1.113:/home/hadoop/.ssh/authorized_keys

    scp ～/.ssh/authorized_keys hadoop@192.168.1.114:/home/hadoop/.ssh/authorized_keys

    scp ～/.ssh/authorized_keys hadoop@192.168.1.115:/home/hadoop/.ssh/authorized_keys
    以上過程由於是第一次傳輸訪問，系統會提示輸入hadoop用戶的密碼，輸入密碼即可。
     4) 驗證是否能夠無密碼登陸到datanode節點
      [hadoop@hadoop1 ~]$ ssh 192.168.1.113 
      如果沒有密碼提示直接登陸顯示如下
        [hadoop@hadoop2 ~]$
       無密碼登陸驗證通過，訪問其他datanode節點類似
6、安裝hadoop2.2
   1）解壓縮hadoop-2.2.0.tar.gz
       tar -zxf hadoop-2.2.0.tar.gz
       默認解壓縮到當前目錄下面，這里解壓縮/home/hadoop/目錄下面
   2) 修改hadoop配置文件
       打開hadoop-2.2.0/etc/hadoop，修改里面的配置文件

      a) hadoop-env.sh，找到里面的JAVA_HOME,修改為實際地址
      b) yarn-env.sh ，同樣找到里面的JAVA_HOME,修改為實際路徑
      c) slave  這個文件配置所有datanode節點，以便namenode搜索，本例配置如下
         hadoop2
         hadoop3
         hadoop4
      d) core-site.xml
       

    <configuration>

        <property>

            <name>fs.defaultFS</name>

            <value>hdfs://hadoop1:9000</value>

        </property>

        <property>

            <name>io.file.buffer.size</name>

            <value>131072</value>

        </property>

        <property>

            <name>hadoop.tmp.dir</name>

            <value>/home/hadoop/hadoopp-2.2.0/mytmp</value>

            <description>A base for other temporarydirectories.</description>

        </property>

        <property>

            <name>hadoop.proxyuser.root.hosts</name>

            <value>hadoop1</value>

        </property>

        <property>

            <name>hadoop.proxyuser.root.groups</name>

            <value>*</value>

        </property>

    </configuration>

   e) hdfs-site.xml
     

    <configuration>

        <property>

            <name>dfs.namenode.name.dir</name>

            <value>/home/hadoop/name</value>

        <final>true</final>

        </property>

        <property>

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

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

        <final>true</final>

        </property>

        <property>

            <name>dfs.replication</name>

        <value>3</value>

        </property>

        <property>

            <name>dfs.permissions</name>

            <value>false</value>

        </property>

    </configuration>

  f) mapred-site.xml
  

    <configuration>

        <property>

            <name>mapreduce.framework.name</name>

            <value>yarn</value>

        </property>

        <property>

            <name>mapreduce.jobhistory.address</name>

            <value>hadoop1:10020</value>

        </property>

        <property>

            <name>mapreduce.jobhistory.webapp.address</name>

            <value>hadoop1:19888</value>

        </property>

        <property>

                <name>mapreduce.jobhistory.intermediate-done-dir</name>

                <value>/mr-history/tmp</value>

        </property>

        <property>

            <name>mapreduce.jobhistory.done-dir</name>

            <value>/mr-history/done</value>

        </property>

    </configuration>

 g) yarn-site.xml
   

    <configuration>

        <property>

        <name>yarn.resourcemanager.address</name>

        <value>hadoop1:18040</value>

    </property>

    <property>

        <name>yarn.resourcemanager.scheduler.address</name>

        <value>hadoop1:18030</value>

    </property>

    <property>

        <name>yarn.resourcemanager.resource-tracker.address</name>

        <value>hadoop1:18025</value>

    </property>

    <property>

            <name>yarn.resourcemanager.admin.address</name>

            <value>hadoop1:18041</value>

     </property>

     <property>

            <name>yarn.resourcemanager.webapp.address</name>

            <value>hadoop1:8088</value>

    </property>

    <property>

        <name>yarn.nodemanager.local-dirs</name>

        <value>/home/hadoop/mynode/my</value>

    </property>

    <property>

            <name>yarn.nodemanager.log-dirs</name>

            <value>/home/hadoop/mynode/logs</value>

    </property>

    <property>

            <name>yarn.nodemanager.log.retain-seconds</name>

            <value>10800</value>

      </property>

        <property>

            <name>yarn.nodemanager.remote-app-log-dir</name>

            <value>/logs</value>

        </property>

        <property>

            <name>yarn.nodemanager.remote-app-log-dir-suffix</name>

            <value>logs</value>

        </property>

        <property>

            <name>yarn.log-aggregation.retain-seconds</name>

            <value>-1</value>

        </property>

        <property>

            <name>yarn.log-aggregation.retain-check-interval-seconds</name>

            <value>-1</value>

        </property>

        <property>

            <name>yarn.nodemanager.aux-services</name>

            <value>mapreduce_shuffle</value>

        </property>

    </configuration>

  3) 將上述文件配置好后，將hadoop-2.2.0文件復制到其余datanode機器上的相同路徑下
    修改/etc/profile文件 設置hadoop環境變量，切換到root用戶
     在文件的最后增加如下配置
    

    #hadoop variable settings

    export HADOOP_HOME=/home/hadoop/hadoop-2.2.0

    export HADOOP_COMMON_HOME=$HADOOP_HOME

    export HADOOP_HDFS_HOME=$HADOOP_HOME

    export HADOOP_MAPRED_HOME=$HADOOP_HOME

    export HADOOP_YARN_HOME=$HADOOP_HOME

    export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

    export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$HADOOP_HOME/lib
   

    export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
    export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib"

    export JAVA_LIBRARY_PATH=$HADOOP_HOME/lib/native
    增加之后保存
    最后兩行特殊說明下，有的文章中遺漏掉這部分配置，最后在啟動hadoop2.2時報了下面的錯誤
  

Hadoop 2.2.0 - warning: You have loaded library /home/hadoop/2.2.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard.

 

 

 

Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Starting namenodes on [Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /home/hadoop/2.2.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.

It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

localhost]

sed: -e expression #1, char 6: unknown option to `s'

HotSpot(TM): ssh: Could not resolve hostname HotSpot(TM): Name or service not known

64-Bit: ssh: Could not resolve hostname 64-Bit: Name or service not known

Java: ssh: Could not resolve hostname Java: Name or service not known

Server: ssh: Could not resolve hostname Server: Name or service not known

VM: ssh: Could not resolve hostname VM: Name or service not known

 配置完成之后需要重啟電腦，所有datanode節點也需要對環境變量增加上面配置，配置完成之后重啟電腦
7、hadoop的啟動與關閉
   1）hadoop namenode的初始化,只需要第一次的時候初始化，之后就不需要了
       cd /home/hadoop/hadoop-2.2.0/bin
        hdfs namenode -format
   2）啟動
       啟動：在namenode機器上，進入/home/myhadoop/sbin
       執行腳本start-all.sh
   3) 關閉
       在namenode節點上，進入/home/myhadoop/sbin
      stop-all.sh
8、web接口地址

啟動hadoop后，在瀏覽器中輸入地址查看

http://hadoop1:50070

http://hadoop1:8088

http://hadoop1:19888