hadoop分布式集群搭建

1.下载hadoop安装包：

wget http://mirror.bit.edu.cn/apache/hadoop/common/hadoop-2.7.3/hadoop-2.7.3.tar.gz 

tar -xvf hadoop-2.7.3.tar.gz  //解压缩

2.设置环境变量

vim  /home/hadoop/.bash_profile 

export JAVA_HOME=/usr/local/dev/software/develop/jdk1.8.0_112

exp_-ort JRE_HOME=$JAVA_HOME/jre

export HADOOP_HOME=/home/hadoop/hadoop-2.7.3

PATH=$PATH:$HOME/.local/bin:$HOME/bin:$JAVA_HOME/bin:$HADOOP_HOME/bin

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH

然后执行：source /home/hadoop/.bash_profile   是环境变量生效

3.修改默认配置文件：、

3.1修改文:hadoop-env.sh

vim hadoop-env.sh  

     添加JAVA_HOME 变量：

# The only required environment variable is JAVA_HOME. All others are

# optional. When running a distributed configuration it is best to

# set JAVA_HOME in this file, so that it is correctly defined on

# remote nodes.

# The java implementation to use.

export JAVA_HOME=/usr/local/dev/software/develop/jdk1.8.0_112

3.2 修改hdfs-site.xml 

dfs.namenode.name.dir

/home/hadoop/hadoop_dir/dfs/name

dfs.datanode.name.dir

file:// /home/hadoop/hadoop_dir/dfs/data

dfs.replication

1

3.3 修改core-site.xml 文件

fs.defaultFS

hdfs://localhost:9000

hadoop.tmp.dir

/home/hadoop/app/hadoop-2.7.3/tmp

3.4 修改文件mapred-site.xml 

mapreduce.framework.name

yarn

3.4修改文件yarn-site.xml

yarn.resourcemanager.hostname

hadoop01

 

yarn.nodemanager.aux-services

mapreduce_shuffle

4.  构建免密登陆

ssh-keygen  -t  rsa    //生成rsa公钥  和私钥

cp ~/.ssh/id_rsa.pub authorized_keys 

ssh root@localhost//可以实现免密登陆

5.格式化和启动

hdfs namenode -format //格式化hdfs文件系统

./sbin/start-all.sh   //启动hadoop集群

 http://localhost:50070 （HDFS管理界面）

http://localhost:8088 （MR管理界面）

6.出现的问题：

error:JAVA_HOME is not set or could not find .

在：$HADOOP_HOME/etc/hadoop/hadoop-env.sh 添加JAVA_HOME

7.hadoop常用的管理界面

http://localhost:50070:hdfs 管理界面

http://localhost:50075:dataNode管理界面

http://localhost:50090:secondaryNameNode 管理界面

http://localhost:8042:managerResoucer 管理界面

http://localhost:34036/ ：dataode管理界面

http://www.360doc.com/content/14/0615/15/9075092_386806245.shtml

http://blog.csdn.net/u010638969/article/details/53391695

https://www.iteblog.com/archives/851.html

http://www.wwaaffxx.com/fileview-578714/

http://blog.csdn.net/u014571011/article/details/51518518