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

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

2.修改配置文件

core-site.xml

<configuration>
    <!-- 指定NameNode的地址 -->
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://hadoop112:9820</value>
    </property>
    <!-- 指定hadoop数据的存储目录 -->
    <property>
        <name>hadoop.tmp.dir</name>
        <value>/opt/module/hadoop-3.1.3/data</value>
    </property>

</configuration>

hdfs-site.xml

<configuration>
    <property>
	<name>dfs.replication</name>
        <value>1</value>
    </property>
    <!-- nn web端访问地址-->
	<property>
        <name>dfs.namenode.http-address</name>
        <value>hadoop112:9870</value>
    </property>
    <!-- 2nn web端访问地址-->
    <property>
        <name>dfs.namenode.secondary.http-address</name>
        <value>hadoop112:9868</value>
    </property>
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>/opt/module/hadoop-3.1.3/data/dfs/name</value>
    </property>
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>/opt/module/hadoop-3.1.3/data/dfs/data</value>
    </property>
</configuration>

yarn-site.xml（也可以不用改）

<configuration>
<!-- Site specific YARN configuration properties -->
     <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
     </property>
</configuration>

3.格式化NameNode

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。

4.启动Hadoop

./sbin/start-dfs.ah

5.Web端查看HDFS信息

结束！