HADOOP环境搭建

Posted 2021-02-14 arthurlance

1) 下载Hadoop
http://archive.cloudera.com/cdh5/cdh/5/
2.6.0-cdh5.7.0

wget http://archive.cloudera.com/cdh5/cdh/5/hadoop-2.6.0-cdh5.7.0.tar.gz

2）安装jdk
下载
解压到app目录：tar -zxvf jdk-7u51-linux-x64.tar.gz -C ~/app/
验证安装是否成功：~/app/jdk1.7.0_51/bin ./java -version
建议把bin目录配置到系统环境变量(~/.bash_profile)中
export JAVA_HOME=/home/hadoop/app/jdk1.7.0_51
export PATH=$JAVA_HOME/bin:$PATH

3）机器参数设置
hostname: hadoop001

修改机器名: /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=hadoop001

设置ip和hostname的映射关系: /etc/hosts
192.168.199.200 hadoop001
127.0.0.1 localhost

ssh免密码登陆(本步骤可以省略，但是后面你重启hadoop进程时是需要手工输入密码才行)
ssh-keygen -t rsa
cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

4）Hadoop配置文件修改: ~/app/hadoop-2.6.0-cdh5.7.0/etc/hadoop
hadoop-env.sh
export JAVA_HOME=/home/hadoop/app/jdk1.7.0_51

core-site.xml
<property>
<name>fs.defaultFS</name>
<value>hdfs://localhost:8020</value>
</property>

<property>
<name>hadoop.tmp.dir</name>
<value>/Users/arthurlance/app/tmp</value>
</property>

hdfs-site.xml
<property>
<name>dfs.replication</name>
<value>1</value>
</property>

5）格式化HDFS
注意：这一步操作，只是在第一次时执行，每次如果都格式化的话，那么HDFS上的数据就会被清空
bin/hdfs namenode -format

6）启动HDFS
sbin/start-dfs.sh

验证是否启动成功:
jps
DataNode
SecondaryNameNode
NameNode

浏览器
http://hadoop001:50070/

7）停止HDFS
sbin/stop-dfs.sh