contos8分布式集群部署hadoop-3.2.1

部署条件准备

需要3台虚拟机master(192.138.137.161)，slaver01(192.138.137.162)，slaver02(192.138.137.163)

系统centos8，配置1核CPU，2G内存，20G硬盘

软件包：hadoop-3.2.2.tar.gz，jdk-8u191-linux-x64.tar.gz

 

安装虚拟机和设置静态ip联网可以参考如下：

安装虚拟机Centos8：https://blog.csdn.net/dp340823/article/details/112056146

宿主机连接wifi，centos8静态IP联网：https://blog.csdn.net/dp340823/article/details/112056911

 

一、安装jdk和hadoop

这些操作是在master(192.138.137.161)进行的，

后续将文件scp到slaver01(192.138.137.162)和slaver02(192.138.137.163)即可

1.上传软件包到指定目录下

2.将jdk解压到指定目录/opt下

tar zxvf jdk-8u191-linux-x64.tar.gz -C /opt

3.将hadoop解压到指定目录/opt下

tar zxvf hadoop-3.2.1.tar.gz  -C /opt

4.修改环境变量并使之生效

vim /etc/profile


#java
export JAVA_HOME=/opt/jdk1.8.0_191
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
#hadoop
export HADOOP_HOME=/opt/hadoop-3.2.1
export PATH=$PATH:$HADOOP_HOME/bin
export HDFS_NAMENODE_USER=root
export HDFS_DATANODE_USER=root
export HDFS_SECONDARYNAMENODE_USER=root
export YARN_RESOURCEMANAGER_USER=root
export YARN_NODEMANAGER_USER=root


source /etc/profile

 

5.验证jdk和hadoop安装是否正确

java -version
hadoop version

 

 二、设置ssh免密登录

3台虚拟机都要做

1.关闭防火墙

systemctl stop firewalld
firewall-cmd --state

2.修改 hosts

vim /etc/hosts


192.168.137.161 master
192.168.137.162 slaver01
192.168.137.163 slaver02

 

3.生成公钥 

ssh-keygen -t rsa

 一直回车即可

4.公钥复制到其他机器上

ssh-copy-id master
ssh-copy-id slaver01
ssh-copy-id slaver02

5.验证登录

ssh master

三、修改hadoop配置文件

配置文件都在/opt/hadoop-3.2.1/etc/hadoop/目录下

1.修改配置文件hadoop-env.sh（在末尾添加已下内容）

vim /opt/hadoop-3.2.1/etc/hadoop/hadoop-env.sh


export JAVA_HOME=/opt/jdk1.8.0_191
export HDFS_NAMENODE_USER=root
export HDFS_DATANODE_USER=root
export HDFS_SECONDARYNAMENODE_USER=root

 

2.修改配置文件core-site.xml

vim /opt/hadoop-3.2.1/etc/hadoop/core-site.xml





    fs.defaultFS
    hdfs://master:9000



    hadoop.tmp.dir
/opt/hadoop-3.2.1/tmp

 

3.修改配置文件hdfs-site.xml

vim /opt/hadoop-3.2.1/etc/hadoop/hdfs-site.xml




    dfs.namenode.http-address
    master:50070




    dfs.namenode.secondary.http-address
    slaver01:50090




    dfs.namenode.name.dir
    /opt/hadoop-3.2.1/name



dfs.replication
    2



    dfs.datanode.data.dir
    /opt/hadoop-3.2.1/data

4.修改配置文件mapred-site.xml

vim /opt/hadoop-3.2.1/etc/hadoop/mapred-site.xml



    mapreduce.framework.name
    yarn

5.修改配置文件yarn-site.xml

vim /opt/hadoop-3.2.1/etc/hadoop/yarn-site.xml




    yarn.resourcemanager.hostname
    master




    yarn.nodemanager.aux-services
    mapreduce_shuffle


    yarn.nodemanager.aux-services.mapreduce.shuffle.class
    org.apache.hadoop.mapred.ShuffleHandler

6.新建masters文件(/opt/hadoop-3.2.1/etc/hadoop/目录下)

vim masters

7.新建workers文件(/opt/hadoop-3.2.1/etc/hadoop/目录下)

vim workers

8.新建tmp、name、data文件夹(/opt/hadoop-3.2.1目录下)

mkdir tmp name data

9.将master机上的复制文件到slaver01、slaver02

scp /etc/profile slaver01:/etc/
scp /etc/profile slaver02:/etc/

scp -r /opt slaver01:/
scp -r /opt slaver02:/

需要在slaver01、slaver02执行source /etc/profile 使用配置文件生效

java -version和hadoop version验证slaver01和slaver02  上的jdk和hadoop是否安装成功

四、启动hadoop

3台虚拟机都要做

1.第一次启动需要格式化namenode(/opt/hadoop-3.2.1)

./bin/hdfs namenode -format

2.启动dfs

./sbin/start-dfs.sh

3.启动yarn

./sbin/start-yarn.sh

 

4.用jps验证

master

slaver01

 slaver02

五、访问应用

1.浏览器输入192.168.137.161:50070

2.浏览器输入192.168.137.161:8088

点击nodes查看

完成！！！