Hadoop伪分布式搭建CentOS
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所需软件及版本: jdk-7u80-linux-x64.tar.gz hadoop-2.6.0.tar.gz 1.安装JDK Hadoop 在需在JDK下运行,注意JDK最好使用Oracle的否则可能出bug 2.创建用户 [[email protected] ~]# groupadd hadoop [[email protected] ~]# useradd -g hadoop hadoop [[email protected] ~]# passwd hadoop 3.配置SSH 确认SSH的客户端和服务端已安装 [[email protected] ~]$ rpm -qa|grep ssh libssh2-1.4.2-1.el6.x86_64 openssh-clients-5.3p1-94.el6.x86_64 openssh-server-5.3p1-94.el6.x86_64 openssh-5.3p1-94.el6.x86_64 [[email protected] ~]$ 配置SSH免密码登陆 [[email protected] ~]$ mkdir ~/.ssh [[email protected] ~]$ cd ~/.ssh/ # 若没有该目录,请先执行一次ssh localhost [[email protected] .ssh]$ ssh-keygen -t dsa # 会有提示,都按回车就可以 [[email protected] .ssh]$ cat id_dsa.pub >> authorized_keys # 加入授权 [[email protected] .ssh]$ chmod 600 ./authorized_keys # 修改文件权限,如果不改,无法通过,原因好像是cent os的权限验证比较严格 [[email protected] .ssh]$ssh MyDB01 # 测试 4.安装hadoop 下载 [[email protected] ~]$ wget http://archive.apache.org/dist/hadoop/core/hadoop-2.6.0/hadoop-2.6.0.tar.gz 解压 [[email protected] hadoop]#tar -zxvf hadoop-2.6.0.tar.gz -C /usr/local 修改权限 [[email protected] local]# mv hadoop-2.6.0/ hadoop/ #更改文件夹名称 [[email protected] local]# chown -R hadoop:hadoop ./hadoop #修改权限 修改环境变量 [[email protected] ~]$ vi .bash_profile export HADOOP_HOME=/usr/local/hadoop export HADOOP_INSTALL=$HADOOP_HOME export HADOOP_MAPRED_HOME=$HADOOP_HOME export HADOOP_COMMON_HOME=$HADOOP_HOME export HADOOP_HDFS_HOME=$HADOOP_HOME export YARN_HOME=$HADOOP_HOME export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.111.x86_64 export PATH=$JAVA_HOME/bin:$PATH export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar 5.配置伪分布式 #手动创建根目录/hadoop 属主:hadoop 1、core-site.xml文件 <configuration> <property> <name>hadoop.tmp.dir</name> <value>file:/hadoop/tmp</value> </property> <property> <name>fs.defaultFS</name> <value>hdfs://MyDB01:9000</value> </property> </configuration> 2、hdfs-site.xml文件 <configuration> <property> <name>dfs.replication</name> <value>1</value> </property> <property> <name>dfs.namenode.name.dir</name> <value>file:/hadoop/tmp/dfs/name</value> </property> <property> <name>dfs.datanode.data.dir</name> <value>file:/hadoop/tmp/dfs/data</value> </property> </configuration> 6.对文件系统HDFS格式化操作 hadoop namenode -format
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