单机模式

下载hadoop-2.7.3.tar.gz 并解压缩

安装java环境

sudo apt install openjdk-8-jdk

设置环境变量

vim /etc/profile

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH

export HADOOP_HOME=/usr/local/hadoop

export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HADOOP_HOME/bin

保存文件

source /etc/profile

修改haddoop中的配置文件

vim /usr/local/hadoop/etc/hadoop/core-site.xml
<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
</configuration>

vim etc/hadoop/hdfs-site.xml
   <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>

无密码登录设置

ssh-keygen -t dsa
ssh-copy-id  -i ~/.ssh/id_rsa.pub root@172.16.242.100

格式化hdfs

/usr/local/hadoop/bin/hdfs namenode -format

启动dfs测试

/usr/local/hadoop/sbin/start-dfs.sh

测试代码

hdfs dfs -mkdir input
hdfs dfs -put etc/hadoop/*.xml input
hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar grep input output 'dfs'

hdfs dfs -get output /data/hadoop

cat /data/hadoop/output/part-r-00000