CentOS7.5配置伪分布式环境

• • • 1.提前安装JDK和Hadoop并配置好环境变量
    • 2.修改配置文件
    • 3.格式化NameNode
    • 4.启动Hadoop
    • 5.Web端查看HDFS信息

vim /etc/profile.d/my_env.sh

# JDK_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_212
export CLASSPATH=$:CLASSPATH:$JAVA_HOME/lib/
export PATH=$PATH:$JAVA_HOME/bin

#HADOOP_HOME
export HADOOP_HOME=/opt/module/hadoop-3.1.3
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin

core-site.xml

    
    
        fs.defaultFS
        hdfs://hadoop112:9820
    
    
    
        hadoop.tmp.dir
        /opt/module/hadoop-3.1.3/data
    

hdfs-site.xml

    
	dfs.replication
        1
    
    
	
        dfs.namenode.http-address
        hadoop112:9870
    
    
    
        dfs.namenode.secondary.http-address
        hadoop112:9868
    
    
        dfs.namenode.name.dir
        /opt/module/hadoop-3.1.3/data/dfs/name
    
    
        dfs.datanode.data.dir
        /opt/module/hadoop-3.1.3/data/dfs/data
    

yarn-site.xml（也可以不用改）

     
        yarn.nodemanager.aux-services
        mapreduce_shuffle
     

hdfs namenode -format

如果格式化成功，会看到 has been successfully formatted 和 Exiting with status 0的提示信息。

./sbin/start-dfs.ah

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5.Web端查看HDFS信息

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