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  配置 Java8 环境

  查看 CentOS 8 配置 Java8 环境

Hadoop 配置

core-site.xml

<configuration>
  <property>
    <name>fs.defaultFS</name>
    <value>hdfs://localhost:9000</value>
  </property>
  <property>
    <name>hadoop.tmp.dir</name> 
      <value>file:/data/hadoop/temp</value>
  </property>
</configuration>

hdfs-site.xml

<configuration>
  <property>
    <name>dfs.replication</name>
    <value>1</value>
  </property>
  <property>
    <name>dfs.namenode.name.dir</name>
    <value>file:/data/hadoop/temp/dfs/name</value>
  </property>
  <property>
    <name>dfs.datanode.data.dir</name>
    <value>file:/data/hadoop/temp/dfs/data</value>
  </property>
</configuration>

hadoop-env.sh

export JAVA_HOME=/home/software/jdk1.8.0_231

设置免密 SSH

  $ ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
  $ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
  $ chmod 0600 ~/.ssh/authorized_keys

格式化 NameNode

$ bin/hdfs namenode -format

启动 NameNode 和 DataNode 进程

$ sbin/start-dfs.sh

访问 NameNode

http://localhost:9870/dfshealth.html#tab-overview