准备工作以及安装Hadoop之前的操作和Hadoop2.X的安装相同，在我上一篇博客中，这里不做过多介绍
https://www.cnblogs.com/lmandcc/p/15306163.html
1. 写一些关键脚本，利于后续集群使用
1.1集群分发脚本xsync
cd /bin/
vim xsyn
#!/bin/bash
#1. 判断参数个数
if [ $# -lt 1 ]; then
echo "Error:Not Enough Arguement"
exit 1
fi
#2. 遍历集群所有机器
for host in hadoop-40 hadoop-41 hadoop-42; do
echo "================================ $host =============================="
#3. 遍历所有目录,发送文件
for file in $@; do
#4. 判断文件是否存在
if [ -e $file ]; then
#5. 获取父目录
pdir=$(
cd -P $(dirname $file)
pwd
)
#6. 获取当前文件名称
fname=$(basename $file)
ssh $host "mkdir -p $pdir"
rsync -av $pdir/$fname $host:$pdir
else
echo "Error:$file does not exist!"
fi
done
done
1.2 查看节点Java进程脚本 jpsall
vim jpsall
#!/bin/bash
for i in hadoop102 hadoop103 hadoop104; do
echo =============== $i ===============
ssh $i "$*" "/usr/local/soft/jdk1.8.0_212/bin/jps"
done
1.3 控制Hadoop启动和停止脚本
vim myhadoop
#!/bin/bash
if [ $# -lt 1 ]; then
echo "No Args Input..."
exit
fi
case $1 in
"start")
echo " =================== 启动 hadoop集群 ==================="
echo " --------------- 启动 hdfs ---------------"
ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/sbin/start-dfs.sh"
echo " --------------- 启动 yarn ---------------"
ssh hadoop103 "/usr/local/soft/hadoop-3.1.3/sbin/start-yarn.sh"
echo " --------------- 启动 historyserver ---------------"
ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/bin/mapred --daemon start his toryserver"
;;
"stop")
echo " =================== 关闭 hadoop集群 ==================="
echo " --------------- 关闭 historyserver ---------------"
ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/bin/mapred --daemon stop hist oryserver"
echo " --------------- 关闭 yarn ---------------"
ssh hadoop103 "/usr/local/soft/hadoop-3.1.3/sbin/stop-yarn.sh"
echo " --------------- 关闭 hdfs ---------------"
ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/sbin/stop-dfs.sh"
;;
*)
echo "Input Args Error..."
;;
esac
注意:这里每个脚本都需要修改读写权限：chmod 777 脚本名称
2. 将Hadoop3.1.3用xftp导入Hadoop102中
3. 解压Hadoop文件
tar -zxvf /usr/local/module/hadoop-3.1.3.tar.gz -C /usr/local/soft
4. 配置环境变量
export JAVA_HOME=/usr/local/soft/jdk1.8.0_212
export PATH=$PATH:$JAVA_HOME/bin
export HADOOP_HOME=/usr/local/soft/hadoop-3.1.3
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
export REDIS_HOME=/usr/local/soft/redis/
export PATH=$PATH:$REDIS_HOME/bin
5. 集群配置搭建
1) 集群部署规划
备注：NameNode和SecondaryNameNode不要安装在同一台服务器
备注：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 |
2）配置集群
cd /usr/local/soft/hadoop-3.1.3/etc/hadoop
(a) 核心配置文件 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>/usr/local/soft/hadoop-3.1.3/data</value>
</property>
</configuration>
(b)HDFS文件 hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<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>
<property>
<name>dfs.permissions.enabled</name>
<value>false</value>
</property>
<property>
<name> dfs.client.block.write.replace-datanode-on-failure.enable </name>
<value>true</value>
</property>
<property>
<name> dfs.client.block.write.replace-datanode-on-failure.policy </name>
<value>never</value>
</property>
<property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property>
</configuration>
（c）YARN配置文件 yarn-site.xml
<configuration> <!-- Site specific YARN configuration properties --> <!-- 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,CLAS SPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>
</property> <!-- 开启日志聚集功能 -->
<property>
<name>yarn.log-aggregation-enable</name>
<value>true</value>
</property> <!-- 设置日志聚集服务器地址 -->
<property>
<name>yarn.log.server.url</name>
<value>http://hadoop102:19888/jobhistory/logs</value>
</property> <!-- 设置日志保留时间为7天 -->
<property>
<name>yarn.log-aggregation.retain-seconds</name>
<value>604800</value>
</property>
</configuration>
（d）MapReduce配置文件 mapred-site.xml
在这里需要重命名mapred-site.xml.template
命令：mv mapred-site.xml.template mapred-site.xml
<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration> <!-- 指定MapReduce程序运行在Yarn上 -->
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property> <!-- 历史服务器端地址 -->
<property>
<name>mapreduce.jobhistory.address</name>
<value>hadoop102:10020</value>
</property> <!-- 历史服务器web端地址 -->
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>hadoop102:19888</value>
</property>
</configuration>
(e)配置workers
（f）在/hadoop/sbin路径下：将start-dfs.sh，stop-dfs.sh两个文件顶部添加以下参数
HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
（g）start-yarn.sh，stop-yarn.sh顶部也需添加以下
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root
6.分发Hadoop给剩余节点
xsync /usr/local/soft/hadoop-3.1.3
7. 启动集群
如果集群是第一次启动，需要在hadoop102节点格式化NameNode
使用myhadoop start 启动集群
使用jpsall查看Java进程
如果配置文件不出错的话，应该和我Java进程相同
8.停止Hadoop集群
myhadoop stop
