hadoop集群搭建

前置条件：JDK安装，JAVA_HOME配置。

1. 下载

wget https://dist.apache.org/repos/dist/release/hadoop/common/hadoop-2.7.3/hadoop-2.7.3.tar.gz

2. 解压

配置hadoop home

vim /etc/profile

export HADOOP_HOME=/xxx/soft/hadoop-2.7.3
export PATH=$PATH:$HADOOP_HOME/bin

　　

3. 配置ssh免密登陆

/etc/hosts

vim /etc/hosts
10.112.29.9 master
10.112.29.10 slave1
10.112.28.237 slave2

ssh-keygen -t RSA

ssh-copy-id master
ssh-copy-id slave1
ssh-copy-id slave2　　

同时将/etc/hosts内容scp至slave1,slave2。

注意：master 本机需要添加本机的ssh免密信任。否则后面namenode 启动不成功。

4. 配置hadoop

./etc/hadoop/hadoop-env.sh   JAVA_HOME配置一下全路径

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

export JAVA_HOME=......./soft/java

...hadoop-2.7.3/etc/hadoop/core-site.xml

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

<configuration>
        <!-- 指定HDFS老大（namenode）的通信地址 -->
        <property>
                <name>fs.defaultFS</name>
                <value>hdfs://master:9000</value>
        </property>
        <!-- 指定hadoop运行时产生文件的存储路径 -->
        <property>
                <name>hadoop.tmp.dir</name>
                <value>file:/xxx/soft/hadoop-2.7.3/tmp</value>
        </property>
</configuration>

　　

..../etc/hadoop/hdfs-site.xml

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

<configuration>

    <!-- 设置namenode的http通讯地址 -->
    <property>
            <name>dfs.namenode.http-address</name>
            <value>master:50070</value>
    </property>

    <!-- 设置secondarynamenode的http通讯地址 -->
    <property>
            <name>dfs.namenode.secondary.http-address</name>
            <value>slave1:50090</value>
    </property>

    <!-- 设置namenode存放的路径 -->
    <property>
            <name>dfs.namenode.name.dir</name>
            <value>file:/xxx/soft/hadoop-2.7.3/tmp/name</value>
    </property>

    <!-- 设置hdfs副本数量 -->
    <property>
            <name>dfs.replication</name>
            <value>2</value>
    </property>

    <!-- 设置datanode存放的路径 -->
    <property>
            <name>dfs.datanode.data.dir</name>
            <value>file:/xxx/soft/hadoop-2.7.3/tmp/data</value>
    </property>

</configuration>

..../etc/hadoop/mapred-site.xml

mv ./etc/mapred-site.xml.template ./etc/mapred-site.xml
vim ./etc/hadoop/mapred-site.xml

<configuration>
    <!-- 通知框架MR使用YARN -->
    <property>
            <name>mapreduce.framework.name</name>
            <value>yarn</value>
    </property>
</configuration>

...../etc/hadoop/yarn-site.xml

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

<configuration>
    <!-- Site specific YARN configuration properties -->
    <!-- 设置 resourcemanager 在哪个节点-->
    <property>
            <name>yarn.resourcemanager.hostname</name>
            <value>master</value>
    </property>

    <!-- reducer取数据的方式是mapreduce_shuffle -->
    <property>
            <name>yarn.nodemanager.aux-services</name>
            <value>mapreduce_shuffle</value>
    </property>

    <property>
            <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
            <value>org.apache.hadoop.mapred.ShuffleHandler</value>
    </property>

</configuration>

创建masters文件

vim ./etc/hadoop/masters

slave1　　

修改slaves文件

vim ./etc/hadoop/slaves

slave1
slave2

5.  拷贝 /xxx/soft/hadoop-2.7.3至slaves

scp -r /xxx/soft/hadoop-2.7.3 slave1:/xxx/soft/

scp -r /xxx/soft/hadoop-2.7.3 slave2:/xxx/soft/

　　

6. 启动

./bin/hdfs namenode -format

./sbin/start-dfs.sh

./sbin/start-yarn.sh 

7. 查看进程

master:
[root@vm-10-112-29-9 hadoop-2.7.3]# jps
14897 ResourceManager
14568 NameNode
16058 Jps

slave1:
[root@vm-10-112-29-10 hadoop-2.7.3]# jps
1522 SecondaryNameNode
2708 Jps
1628 NodeManager
1405 DataNode

slave2:
[root@vm-10-112-28-237 hadoop-2.7.3]# jps
1799 DataNode
2876 Jps
1935 NodeManager

8. 访问

http://10.112.29.9:8088/

http://10.112.29.9:50070/

http://10.112.29.10:50090/