Hadoop伪分布式集群搭建

软件准备

我使用的是centos-6.6的虚拟机，主机名为repo。参考在windows中安装linux虚拟机的步骤，我在该虚拟机中安装了JDK，参考在Linux中安装JDK的指南。此外，该虚拟机配置了免秘钥登录自身，参考配置各台虚拟机之间免秘钥登录的设置。hadoop安装包的下载地址为：https://www.php.cn/link/eecd2755d73701aa057cd2a32bd7b1e2。

1. 将Hadoop安装包上传到服务器并解压

   [root@repo ~]# tar zxvf hadoop-2.6.5.tar.gz -C /opt/apps/

2. 配置环境变量

   # 可以直接定位到文件的最后一行 [root@repo hadoop-2.6.5]# vi + /etc/profile export HADOOP_HOME=/opt/apps/hadoop-2.6.5 export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin [root@repo hadoop-2.6.5]# . /etc/profile

3. 修改 hadoop-env.sh、mapred-env.sh、yarn-env.sh 这三个配置文件，添加JAVA_HOME

   [root@repo hadoop]# pwd /opt/apps/hadoop-2.6.5/etc/hadoop [root@repo hadoop]# vi hadoop-env.sh export JAVA_HOME=/usr/local/jdk1.8.0_73 [root@repo hadoop]# vi mapred-env.sh export JAVA_HOME=/usr/local/jdk1.8.0_73 [root@repo hadoop]# vi yarn-env.sh export JAVA_HOME=/usr/local/jdk1.8.0_73

4. 修改 core-site.xml 和 hdfs-site.xml 配置文件，配置伪分布式相关的内容

   [root@repo hadoop]# vi core-site.xml <configuration> <property>  <name>fs.defaultFS</name>  <value>hdfs://repo:9000</value> </property> <property>  <name>hadoop.tmp.dir</name>  <value>/var/hadoop/pseudo</value> </property> </configuration> [root@repo hadoop]# vi hdfs-site.xml <configuration> <property>  <name>dfs.replication</name>  <value>1</value> </property> <property>  <name>dfs.namenode.secondary.http-address</name>  <value>repo:50090</value> </property> </configuration>

5. 修改 slaves 配置文件，指定DataNode所在的节点

   [root@repo hadoop]# vi slaves repo

6. 格式化文件系统

   [root@repo hadoop]# hadoop namenode --format # 成功信息 17/09/16 21:17:11 INFO common.Storage: Storage directory /var/hadoop/pseudo/dfs/name has been successfully formatted.

7. 启动HDFS和YARN

   [root@repo hadoop]# start-dfs.sh Starting namenodes on [repo] repo: starting namenode, logging to /opt/apps/hadoop-2.6.5/logs/hadoop-root-namenode-repo.out repo: starting datanode, logging to /opt/apps/hadoop-2.6.5/logs/hadoop-root-datanode-repo.out Starting secondary namenodes [repo] repo: starting secondarynamenode, logging to /opt/apps/hadoop-2.6.5/logs/hadoop-root-secondarynamenode-repo.out [root@repo hadoop]# start-yarn.sh starting yarn daemons starting resourcemanager, logging to /opt/hadoop-2.7.4/logs/yarn-root-resourcemanager-repo.out repo: starting nodemanager, logging to /opt/hadoop-2.7.4/logs/yarn-root-nodemanager-repo.out [root@repo hadoop]# jps 4368 Jps 3957 ResourceManager 3512 NameNode 3641 DataNode 4058 NodeManager 3805 SecondaryNameNode

8. 访问WEB页面 搭建成功！