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 ```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） ```xml <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！
