Hadoop之集群配置集群部署规划注意： ➢ NameNode 和 SecondaryNameNode 不要安装在同一

集群部署规划

注意：

➢ NameNode 和 SecondaryNameNode 不要安装在同一台服务器

➢ ResourceManager 也很消耗内存，不要和 NameNode、SecondaryNameNode 配置在同一台机器上。

	hadoop102	hadoop103	hadoop104
HDFS	NameNode DataNode	DataNode	SecondaryNameNode DataNode
YARN	NodeManager	ResourceManager NodeManager	NodeManager

配置文件说明

Hadoop 配置文件分两类：默认配置文件和自定义配置文件，只有用户想修改某一默认配置值时，才需要修改自定义配置文件，更改相应属性值。

默认配置文件:

要获取的默认文件	文件存放在jar包中的位置
[core-default.xml]	hadoop-common-3.1.3.jar/core-default.xml
[hdfs-default.xml]	hadoop-hdfs-3.1.3.jar/hdfs-default.xml
[yarn-default.xml]	hadoop-yarn-common-3.1.3.jar/yarn-default.xml
[mapred-default.xml]	hadoop-mapreduce-client-core-3.1.3.jar/mapred-default.xml

自定义配置文件

core-site.xml、hdfs-site.xml、yarn-site.xml、mapred-site.xml 四个配置文件存放在$HADOOP_HOME/etc/hadoop 这个路径上，用户可以根据项目需求重新进行修改配置。

配置集群

核心配置文件

配置`core-site.xml`

[muyi@hadoop102 ~]$ cd $HADOOP_HOME/etc/hadoop
[muyi@hadoop102 hadoop]$ vim core-site.xml 


<configuration>
    <!-- 指定 NameNode 的地址 -->
    <property>
        <name>fs.defaultFS</name>
         <value>hdfs://hadoop102:8020</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>
    <!-- 配置 HDFS 网页登录使用的静态用户为 muyi -->
    <property>
         <name>hadoop.http.staticuser.user</name>
        <value>muyi</value>
    </property>

</configuration>

HDFS配置文件

配置`hdfs-site.xml`

[muyi@hadoop102 hadoop]$ vim hdfs-site.xml

<configuration>
    <!-- nn web 端访问地址-->
    <property>
         <name>dfs.namenode.http-address</name>
        <value>hadoop102:9870</value>
    </property>
    <!-- 2nn web 端访问地址-->
    <property>
        <name>dfs.namenode.secondary.http-address</name>
         <value>hadoop104:9868</value>
    </property>
</configuration>

YARN配置文件

配置`yarn-site.xml`

[muyi@hadoop102 hadoop]$ vim yarn-site.xml

<configuration>
     <!-- 指定 MR 走 shuffle -->
     <property>
         <name>yarn.nodemanager.aux-services</name>
         <value>mapreduce_shuffle</value>
     </property>
     <!-- 指定 ResourceManager 的地址-->
     <property>
         <name>yarn.resourcemanager.hostname</name>
         <value>hadoop103</value>
     </property>
     <!-- 环境变量的继承 -->
     <property>
         <name>yarn.nodemanager.env-whitelist</name>
        <value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>
     </property>
 
</configuration>

MapReduce 配置文件

配置 `mapred-site.xml`

[muyi@hadoop102 hadoop]$ vim mapred-site.xml


<configuration>
    <!-- 指定 MapReduce 程序运行在 Yarn 上 -->
    <property>
         <name>mapreduce.framework.name</name>
         <value>yarn</value>
    </property>
</configuration>

分发配置好的文件

这里使用自己写的脚本来分发,脚本名称为xsync

[muyi@hadoop102 etc]$ cd /opt/module/hadoop-3.1.3/etc/
[muyi@hadoop102 etc]$ ll
总用量 4
drwxr-xr-x. 3 muyi muyi 4096 11月 12 07:19 hadoop
[muyi@hadoop102 etc]$ xsync hadoop/
==================== hadoop102 ====================
sending incremental file list

sent 884 bytes  received 18 bytes  601.33 bytes/sec
total size is 107,642  speedup is 119.34
==================== hadoop103 ====================
sending incremental file list
hadoop/
hadoop/core-site.xml
hadoop/hdfs-site.xml
hadoop/mapred-site.xml
hadoop/yarn-site.xml

sent 3,371 bytes  received 139 bytes  2,340.00 bytes/sec
total size is 107,642  speedup is 30.67
==================== hadoop104 ====================
sending incremental file list
hadoop/
hadoop/capacity-scheduler.xml
hadoop/configuration.xsl
hadoop/container-executor.cfg
hadoop/core-site.xml
hadoop/hadoop-env.cmd
hadoop/hadoop-env.sh
hadoop/hadoop-metrics2.properties
hadoop/hadoop-policy.xml
hadoop/hadoop-user-functions.sh.example
hadoop/hdfs-site.xml
hadoop/httpfs-env.sh
hadoop/httpfs-log4j.properties
hadoop/httpfs-signature.secret
hadoop/httpfs-site.xml
hadoop/kms-acls.xml
hadoop/kms-env.sh
hadoop/kms-log4j.properties
hadoop/kms-site.xml
hadoop/log4j.properties
hadoop/mapred-env.cmd
hadoop/mapred-env.sh
hadoop/mapred-queues.xml.template
hadoop/mapred-site.xml
hadoop/ssl-client.xml.example
hadoop/ssl-server.xml.example
hadoop/user_ec_policies.xml.template
hadoop/workers
hadoop/yarn-env.cmd
hadoop/yarn-env.sh
hadoop/yarn-site.xml
hadoop/yarnservice-log4j.properties
hadoop/shellprofile.d/
hadoop/shellprofile.d/example.sh

sent 5,110 bytes  received 1,642 bytes  4,501.33 bytes/sec
total size is 107,642  speedup is 15.94
[muyi@hadoop102 etc]$

到此,集群配置结束,下一步就是群起集群

Hadoop之集群配置