02大数据学习之hadoop搭建——hadoop-2.6.1

前言——hadoop搭建2.x和1.x有区别，这里不做阐述。介绍2.6.1搭建的过程，主要是配置文件中参数的配置
需要的工具包——jdk1.7,hadoop-2.6.1,集群环境是上篇博客中自己搭建的虚拟集群：

                

1、安装包下载：方法自行get

2、先安装jdk,

• 将压缩包解压：tar zxvf jdk-7u67-linux-x64.tar.gz
• 配置jdk环境变量：master、slave1、slave2：vim ~/.bashrc

1. 
   

    将JDK分别拷贝到从节点上：

        scp -r /usr/local/src/jdk1.7.0_67 root@slave1:/usr/local/src/jdk1.7.0_67

        scp -r /usr/local/src/jdk1.7.0_67 root@slave2:/usr/local/src/jdk1.7.0_67

3、hadoop安装：

• 解压安装包到指定目录下：tar zxvf hadoop-2.6.1.tar.gz
•     修改Hadoop配置文件：master :cd hadoop-2.6.1/etc/hadoop

  vim hadoop-env.sh

                     export JAVA_HOME=/usr/local/src/jdk1.7.0_67

          vim yarn-env.sh

                    export JAVA_HOME=/usr/local/src/ jdk1.7.0_67

                    

          vim slaves

                    slave1

                    slave2

          vim core-site.xml

                        

                    

                    fs.defaultFS

                    hdfs://192.168.142.10:9000

                    

                    

                    hadoop.tmp.dir

                    file:/usr/local/src/hadoop-2.6.1/tmp

                    

                    

        vim hdfs-site.xml

                        

                        

                        dfs.namenode.secondary.http-address

                        master:9001

                        

                        

                        dfs.namenode.name.dir

                        file:/usr/local/src/hadoop-2.6.1/dfs/name

                        

                        

                        dfs.datanode.data.dir

                        file:/usr/local/src/hadoop-2.6.1/dfs/data

                        

                        

                        dfs.repliction

                        3

                        

                        

        vim mapred-site.xml

                    

                    

                    mapreduce.framework.name

                    yarn

                    

                    

        vim yarn-site.xml

                    

                

                yarn.nodemanager.aux-services

                mapreduce_shuffle

                

           

                yarn.nodemanager.aux-services.mapreduce.shuffle.class

                org.apache.hadoop.mapred.ShuffleHandler

                 

           

                yarn.resourcemanager.address

                master:8032

                 

           

                yarn.resourcemanager.scheduler.address

                master:8030

                 

             

                yarn.resourcemanager.resource-tracker.address

                master:8035

                 

           

                yarn.resourcemanager.admin.address

                master:8033

                 

           

                yarn.resourcemanager.webapp.address

                master:8088

                 

            

• #创建临时目录和文件目录

        mkdir /usr/local/src/hadoop-2.6.1/tmp

        mkdir -p /usr/local/src/hadoop-2.6.1/dfs/name

        mkdir -p /usr/local/src/hadoop-2.6.1/dfs/data

• 配置环境变量：master、slave1、slave2:vim ~/.bashrc 
  • HADOOP_HOME=/usr/local/src/hadoop-2.6.1
    export PATH=$PATH:$HADOOP_HOME/bin

    拷贝安装包：

            scp -r /usr/local/src/hadoop-2.6.1 root@slave1:/usr/local/src/hadoop-2.6.1

            scp -r /usr/local/src/hadoop-2.6.1 root@slave2:/usr/local/src/hadoop-2.6.1

启动集群

        #Master

        #初始化Namenode

        hadoop namenode -format //只能初始化一次，如果安装的有问题，需要将三个节点中dfs下的文件都删掉。 rm -rf /home/hadoop/hadoop/dfs

       启动hadoop集群：./sbin/start-all.sh

        

    查看master进程状态：jps

    查看slave1、slave2进程状态：jps

    关闭集群：./sbin/stop-all.sh

总结：在这个过程中一定要细致，先配置主节点，然后再拷贝到从节点，自己在配置过程中就是遇到了ssh互信的问题，导致有的节点无法启动，后来从新互信以后就解决了connection time out，已及refused的问题，在启动集群以后试试能不能put上文件：hadoop fs -put filename /filedir

这里就是整个hadoop集群搭建的过程！