centos 7 hadoop 3.1 集群搭建

前言

hadoop 是一个由Apache基金会所开发的分布式系统基础架构。用户可以在不了解分布式底层细节的情况下，开发分布式程序。充分利用集群的威力进行高速运算和存储。 [ 百度百科 ]

开始

1 .在三个虚拟机中分别下载好 hadoop(3.1.0) 和 java(1.8)

cd /usr/local
wget wget http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz?AuthParam=1533698216_4d96320e63a975b4cec59c2616d523dd
wget http://mirrors.hust.edu.cn/apache/hadoop/common/hadoop-3.1.0/hadoop-3.1.0.tar.gz
mkdir /usr/local/java
mkdir /usr/local/hadoop
tar  -zxvf   jdk-8u181-linux-x64.tar.gz\?AuthParam\=1533698216_4d96320e63a975b4cec59c2616d523dd    -C      /usr/local/java
tar  -zxvf   hadoop-3.1.0.tar.gz    -C      /usr/local/hadoop

2 .设置各个机器的host，然后重启

vim /etc/hosts
    192.168.1.76   hserver1
    192.168.1.77   hserver2
    192.168.1.78   hserver3
reboot

3 .设置各个机器的ssh互通，只需hserver1能无密码登录hserver2和hserver3，因为hserver1是master，会通过ssh命令启动其他2个hadoop work

vim /etc/ssh/sshd_config
    PermitRootLogin yes

hserver1：

scp /root/.ssh/id_rsa.pub root@hserver2:/root
scp /root/.ssh/id_rsa.pub root@hserver3:/root

hserver2、hserver3：

mkdir -p /root/.ssh
cd /root/.ssh
cat /root/id_rsa.pub >> authorized_keys

ssh连接测试：

ssh hserver2
ssh hserver3

4 .创建三个文件夹

mkdir  -p  /usr/local/hadoop/hadoop-3.1.0/data/datanode
mkdir  -p  /usr/local/hadoop/hadoop-3.1.0/data/name
mkdir  -p  /usr/local/hadoop/hadoop-3.1.0/data/tmp

5 .配置环境变量

vim /etc/profile
    export JAVA_HOME=/usr/local/java/jdk1.8.0_181
    export JRE_HOME=${JAVA_HOME}/jre
    export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
    export HADOOP_HOME=/usr/local/hadoop/hadoop-3.1.0
    export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
source /etc/profile

6 .配置hadoop环境变量

cd /usr/local/hadoop/hadoop-3.1.0/etc/hadoop
vim hadoop-env.sh
    export JAVA_HOME=/usr/local/java/jdk1.8.0_181
    export HADOOP_HOME=/usr/local/hadoop/hadoop-3.1.0
    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

7 .设置hadoop文件core-site.xml

vim core-site.xml
    <configuration>
        <property>
            <name>fs.defaultFS</name>
            <value>hdfs://hserver1:9000</value>
        </property>
        <property>
            <name>hadoop.tmp.dir</name>
            <value>/usr/local/hadoop/hadoop-3.1.0/data/tmp</value>
        </property>
    </configuration>

8 .设置hadoop文件hdfs-site.xml
hserver1：

vim core-site.xml
    <configuration>
        <property>
            <name>dfs.namenode.http-address</name>
            <value>hserver1:9001</value>
        </property> 
        <property>
            <name>dfs.namenode.secondary.http-address</name>
            <value>hserver2:9002</value>
        </property>
        <property>
            <name>dfs.namenode.name.dir</name>
            <value>/usr/local/hadoop/hadoop-3.1.0/data/name</value>
        </property>
        <property>
            <name>dfs.replication</name>
            <value>1</value>
        </property>
        <property>
            <name>dfs.datanode.data.dir</name>
            <value>/usr/local/hadoop/hadoop-3.1.0/data/datanode</value>
        </property>
        <property>
            <name>dfs.permissions</name>
            <value>false</value>
        </property>
    </configuration>

hserver2：

vim core-site.xml
    <configuration>
        <property>
            <name>dfs.replication</name>
            <value>1</value>
        </property>
        <property>
            <name>dfs.namenode.name.dir</name>
            <value>/usr/local/hadoop/hadoop-3.1.0/data/name</value>
        </property>
        <property>
            <name>dfs.datanode.data.dir</name>
            <value>/usr/local/hadoop/hadoop-3.1.0/data/datanode</value>
        </property>
        <property>
            <name>dfs.permissions</name>
            <value>false</value>
        </property>
    </configuration>

hserver3：

vim core-site.xml
    <configuration>
        <property>
            <name>fs.defaultFS</name>
            <value>hdfs://hserver1:9000</value>
        </property>
        <property>
            <name>hadoop.tmp.dir</name>
            <value>/usr/local/hadoop/hadoop-3.1.0/data/tmp</value>
        </property>
    </configuration>