CentOS7 从零开始搭建 Hadoop2.7集群

太过爱你忘了你带给我的痛 2022-09-26 02:18 241阅读 0赞

*  序言
 *  文件准备
 *  权限修改
 *  配置系统环境
 *  配置Hadoop集群
 *  配置无密码登录
 *  启动Hadoop
 *  默认举例
    
     *

# 序言 #

*  下载软件与工具包  
    
    
     *  [pscp.exe][] : 用于从本地到目标机器的文件传输
     *  [hadoop-2.7.3.targ.gz][]: Hadoop 2.7 软件包
     *  [JDK 1.8][]: Java 运行环境
 *  准备四台安装好CentOS Minimal 的机器，且已经配置网络环境。（只需要记住四台机器的IP地址，主机名后面设置）  
    
    
     *  机器1： 主机名 node， IP: 192.168.169.131
     *  机器1： 主机名 node1， IP: 192.168.169.133
     *  机器1： 主机名 node2， IP: 192.168.169.132
     *  机器1： 主机名 node3， IP: 192.168.169.134

# 文件准备 #

1.  添加用户组与用户
    
        groupadd hadoop
        useradd -d /home/hadoop -g hadoop hadoop
2.  复制本机文件到目标机器
    
        pscp.exe -pw 12345678 hadoop-2.7.3.tar.gz root@192.168.169.131:/usr/local 
        
        pscp.exe -pw 12345678 spark-2.0.0-bin-hadoop2.7.tgz root@192.168.169.131:/usr/local
3.  解压并复制文件
    
        tar -zxvf  /usr/local/jdk-8u101-linux-x64.tar.gz
        
        
        #重命名
        
        mv /usr/local/jdk1.8.0_101 /usr/local/jdk1.8
        
        tar -zxvf /usr/local/hadoop-2.7.3.tar.gz
        
        mv /usr/local/hadoop-2.7.3 /home/hadoop/hadoop2.7

# 权限修改 #

1.  修改夹所有者
    
        chmod -R hadoop:hadoop /home/hadoop/hadoop2.7
2.  修改组执行权限
    
        chmod -R g=rwx /home/hadoop/hadoop2.7

# 配置系统环境 #

1.  配置系统变量
    
        echo 'export JAVA_HOME=/usr/local/jdk1.8' >> /etc/profile
        
            echo 'export JRE_HOME=$JAVA_HOME/jre' >> /etc/profile
        
            echo 'export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar' >> /etc/profile
        
            echo 'export HADOOP_HOME=${hadoopFolder}' >> /etc/profile
        
            echo 'export PATH=$HADOOP_HOME/bin:$PATH' >> /etc/profile
        
            source /etc/profile
2.  配置主机域名
    
        hostname node #当前机器名称
        echo NETWORKING=yes >> /etc/sysconfig/network
        
        echo HOSTNAME=node >> /etc/sysconfig/network #当前机器名称，避免重启主机名失效
        
        echo '192.168.169.131 node' >> /etc/hosts
        echo '192.168.169.133 node1' >> /etc/hosts
        echo '192.168.169.132 node2' >> /etc/hosts
        echo '192.168.169.134 node3' >> /etc/hosts
3.  关闭防火墙
    
        systemctl stop firewalld.service
        systemctl disable firewalld.service

# 配置Hadoop集群 #

1.  修改配置文件
    
        sed -i 's/\${ JAVA_HOME}/\/usr\/local\/jdk1.8\//' $HADOOP_HOME/etc/hadoop/hadoop-env.sh sed -i 's/# export JAVA_HOME=\/home\/y\/libexec\/jdk1.6.0\//export JAVA_HOME=\/usr\/local\/jdk1.8\//' $HADOOP_HOME/etc/hadoop/yarn-env.sh
        
        sed -i 's/# export JAVA_HOME=\/home\/y\/libexec\/jdk1.6.0\//export JAVA_HOME=\/usr\/local\/jdk1.8\//'  $HADOOP_HOME/etc/hadoop/mapred-env.sh
2.  配置从节点主机名
    
        echo node1 > $HADOOP_HOME/etc/hadoop/slaves
        echo node2 >> $HADOOP_HOME/etc/hadoop/slaves
        echo node3 >> $HADOOP_HOME/etc/hadoop/slaves
3.  拷贝文件并覆盖以下文件
    
     *  /home/hadoop/hadoop2.7/etc/hadoop/core-site.xml
    
        <configuration>
        <property>
            <name>fs.defaultFS</name>
            <value>hdfs://node:9000/</value>
            <description>namenode settings</description>
        </property>
        <property>
            <name>hadoop.tmp.dir</name>
            <value>/home/hadoop/tmp/hadoop-${user.name}</value>
            <description> temp folder </description>
        </property>  
        <property>
            <name>hadoop.proxyuser.hadoop.hosts</name>
            <value>*</value>
        </property>
        <property>
            <name>hadoop.proxyuser.hadoop.groups</name>
            <value>*</value>
        </property>
        </configuration>
    
     *  /home/hadoop/hadoop2.7/etc/hadoop/hdfs-site.xml
    
        <configuration>  
            <property>  
                <name>dfs.namenode.http-address</name>  
                <value>node:50070</value>  
                <description> fetch NameNode images and edits.注意主机名称 </description>  
            </property>
            <property>  
                <name>dfs.namenode.secondary.http-address</name>  
                <value>node1:50090</value>  
                <description> fetch SecondNameNode fsimage </description>  
            </property> 
            <property>
                <name>dfs.replication</name>
                <value>3</value>
                <description> replica count </description>
            </property>
            <property>  
                <name>dfs.namenode.name.dir</name>  
                <value>file:///home/hadoop/hadoop2.7/hdfs/name</value>  
                <description> namenode </description>  
            </property>  
            <property>  
                <name>dfs.datanode.data.dir</name>
                <value>file:///home/hadoop/hadoop2.7/hdfs/data</value>  
                <description> DataNode </description>  
            </property>  
            <property>  
                <name>dfs.namenode.checkpoint.dir</name>  
                <value>file:///home/hadoop/hadoop2.7/hdfs/namesecondary</value>  
                <description>  check point </description>  
            </property> 
            <property>
                <name>dfs.webhdfs.enabled</name>
                <value>true</value>
            </property>
            <property>
                <name>dfs.stream-buffer-size</name>
                <value>131072</value>
                <description> buffer </description>
            </property> 
            <property>  
                <name>dfs.namenode.checkpoint.period</name>  
                <value>3600</value>  
                <description> duration </description>  
            </property> 
        </configuration>
    
     *  /home/hadoop/hadoop2.7/etc/hadoop/mapred-site.xml
    
        <configuration>  
            <property>
                <name>mapreduce.framework.name</name>
                <value>yarn</value>
                </property>
            <property>
                <name>mapreduce.jobtracker.address</name>
                <value>hdfs://trucy:9001</value>
            </property>
            <property>
                <name>mapreduce.jobhistory.address</name>
                <value>node:10020</value>
                <description>MapReduce JobHistory Server host:port, default port is 10020.</description>
            </property>
            <property>
                <name>mapreduce.jobhistory.webapp.address</name>
                <value>node:19888</value>
                <description>MapReduce JobHistory Server Web UI host:port, default port is 19888.</description>
            </property>
        </configuration>
    
     *  /home/hadoop/hadoop2.7/etc/hadoop/yarn-site.xml
    
        <configuration>
            <property>
                <name>yarn.resourcemanager.hostname</name>
                <value>node</value>
            </property>
        
            <property>
                <name>yarn.nodemanager.aux-services</name>
                <value>mapreduce_shuffle</value>
            </property>
        
            <property>
                <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
                <value>org.apache.hadoop.mapred.ShuffleHandler</value>
            </property>
        
            <property>
                <name>yarn.resourcemanager.address</name>
                <value>node:8032</value>
            </property>
        
            <property>
                <name>yarn.resourcemanager.scheduler.address</name>
                <value>node:8030</value>
            </property>
        
            <property>
                <name>yarn.resourcemanager.resource-tracker.address</name>
                <value>node:8031</value>
            </property>
        
            <property>
                <name>yarn.resourcemanager.admin.address</name>
                <value>node:8033</value>
            </property>
        
            <property>
                <name>yarn.resourcemanager.webapp.address</name>
                <value>node:8088</value>
            </property>
        </configuration>

# 配置无密码登录 #

1.  在所有主机上创建目录并赋予权限
    
        mkdir /home/hadoop/.ssh
        chomod 700 /home/hadoop/.ssh
2.  在node主机上生成RSA文件
    
        ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
3.  生成并拷贝 authorized\_keys文件
    
        cp /home/hadoop/.ssh/id_rsa.pub authorized_keys
        
        scp /home/hadoop/.ssh/authorized_keys node1:/home/hadoop/.ssh
        
        scp /home/hadoop/.ssh/authorized_keys node2:/home/hadoop/.ssh
        
        scp /home/hadoop/.ssh/authorized_keys node3:/home/hadoop/.ssh
4.  在所有主机上修改拥有者和权限
    
        chmod 600 .ssh/authorized_keys
        chown -R hadoop:hadoop .ssh
5.  修改ssh 配置文件
    
        注释掉
        
        # AuthorizedKeysFile .ssh/authorized_keys
6.  重新启动ssh
    
        service sshd restart
    
    Note: 第一次连接仍然需要输入密码。

# 启动Hadoop #

1.  进入Node 主机，并切换到hadoop账号
    
        su hadoop
2.  格式化 namenode
    
        /home/hadoop/hadoop2.7/bin/hdfs namenode -format
3.  启动 hdfs
    
        /home/hadoop/hadoop2.7/sbin/start-dfs.sh
4.  验证 hdfs 状态  
    ![这里写图片描述][20160917024437601]
5.  启动 yarn
    
        /home/hadoop/hadoop2.7/sbin/start-yarn.sh
6.  验证 yarn 状态  
    ![这里写图片描述][20160917024604072]

# 默认举例 #

1.  创建文件夹
    
        /home/hadoop/hadoop2.7/bin/hadoop fs -mkdir -p /data/wordcount
        
        /home/hadoop/hadoop2.7/bin/hadoop fs -mkdir -p /output/
2.  上传文件
    
        hadoop fs -put /home/hadoop/hadoop2.2/etc/hadoop/*.xml /data/wordcount/
        
        hadoop fs -ls /data/wordcount
3.  执行Map-Reduce
    
        hadoop  jar  /home/hadoop/hadoop2.2/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount  /data/wordcount  /output/wordcount
4.  查看状态
    
        http://192.168.169.131:8088/cluster
5.  浏览结果
    
        hadoop fs -cat /output/wordcount/part-r-00000 | more

## ![结果][20160917025433216] ##

引用：  
[https://www.baidu.com/s?wd=hadoop%E9%9B%86%E7%BE%A4%E7%8E%AF%E5%A2%83%E6%90%AD%E5%BB%BA&rsv\_spt=1&rsv\_iqid=0xffb1db6f0002def2&issp=1&f=8&rsv\_bp=1&rsv\_idx=2&ie=utf-8&rqlang=cn&tn=baiduhome\_pg&rsv\_enter=1&oq=shell%20%E5%88%9B%E5%BB%BA%E6%96%87%E4%BB%B6%E5%A4%B9&rsv\_t=b457e81oNfX2KqE2N62rZkxga5NJ4LA1PBga1gBeH2Y2RZr1dK5cXsG6jPkERHUs8L6b&inputT=7316&rsv\_pq=8f6d21860003ff4f&rsv\_sug3=177&rsv\_sug1=134&rsv\_sug7=100&bs=shell%20%E5%88%9B%E5%BB%BA%E6%96%87%E4%BB%B6%E5%A4%B9][https_www.baidu.com_s_wd_hadoop_E9_9B_86_E7_BE_A4_E7_8E_AF_E5_A2_83_E6_90_AD_E5_BB_BA_rsv_spt_1_rsv_iqid_0xffb1db6f0002def2_issp_1_f_8_rsv_bp_1_rsv_idx_2_ie_utf-8_rqlang_cn_tn_baiduhome_pg_rsv_enter_1_oq_shell_20_E5_88_9B_E5_BB_BA_E6_96_87_E4_BB_B6_E5_A4_B9_rsv_t_b457e81oNfX2KqE2N62rZkxga5NJ4LA1PBga1gBeH2Y2RZr1dK5cXsG6jPkERHUs8L6b_inputT_7316_rsv_pq_8f6d21860003ff4f_rsv_sug3_177_rsv_sug1_134_rsv_sug7_100_bs_shell_20_E5_88_9B_E5_BB_BA_E6_96_87_E4_BB_B6_E5_A4_B9]

[http://www.cnblogs.com/liuling/archive/2013/06/16/2013-6-16-01.html][http_www.cnblogs.com_liuling_archive_2013_06_16_2013-6-16-01.html]

[pscp.exe]: http://download.csdn.net/detail/lch_cn/4826579
[hadoop-2.7.3.targ.gz]: http://www.apache.org/dyn/closer.cgi/hadoop/common/hadoop-2.7.3/hadoop-2.7.3.tar.gz
[JDK 1.8]: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
[20160917024437601]: /images/20220717/91e74fe17c3a430ea592f1f577f53815.png
[20160917024604072]: /images/20220717/1f13923c3fa54fa582801dad9590f588.png
[20160917025433216]: /images/20220717/0ec4f868281d4e2f8c64a30a6ce5620f.png
[https_www.baidu.com_s_wd_hadoop_E9_9B_86_E7_BE_A4_E7_8E_AF_E5_A2_83_E6_90_AD_E5_BB_BA_rsv_spt_1_rsv_iqid_0xffb1db6f0002def2_issp_1_f_8_rsv_bp_1_rsv_idx_2_ie_utf-8_rqlang_cn_tn_baiduhome_pg_rsv_enter_1_oq_shell_20_E5_88_9B_E5_BB_BA_E6_96_87_E4_BB_B6_E5_A4_B9_rsv_t_b457e81oNfX2KqE2N62rZkxga5NJ4LA1PBga1gBeH2Y2RZr1dK5cXsG6jPkERHUs8L6b_inputT_7316_rsv_pq_8f6d21860003ff4f_rsv_sug3_177_rsv_sug1_134_rsv_sug7_100_bs_shell_20_E5_88_9B_E5_BB_BA_E6_96_87_E4_BB_B6_E5_A4_B9]: https://www.baidu.com/s?wd=hadoop%E9%9B%86%E7%BE%A4%E7%8E%AF%E5%A2%83%E6%90%AD%E5%BB%BA&rsv_spt=1&rsv_iqid=0xffb1db6f0002def2&issp=1&f=8&rsv_bp=1&rsv_idx=2&ie=utf-8&rqlang=cn&tn=baiduhome_pg&rsv_enter=1&oq=shell%20%E5%88%9B%E5%BB%BA%E6%96%87%E4%BB%B6%E5%A4%B9&rsv_t=b457e81oNfX2KqE2N62rZkxga5NJ4LA1PBga1gBeH2Y2RZr1dK5cXsG6jPkERHUs8L6b&inputT=7316&rsv_pq=8f6d21860003ff4f&rsv_sug3=177&rsv_sug1=134&rsv_sug7=100&bs=shell%20%E5%88%9B%E5%BB%BA%E6%96%87%E4%BB%B6%E5%A4%B9
[http_www.cnblogs.com_liuling_archive_2013_06_16_2013-6-16-01.html]: http://www.cnblogs.com/liuling/archive/2013/06/16/2013-6-16-01.html