linux安装hadoop小结

首先安装jdk

设置环境变量

下载hadoop

修改jdk profile，增加HADOOP_HOME

修改hadoop下的4个文件

hadoop-env.sh

export JAVA_HOME=../../../../home/briup/jdk1.7

core-site.xml

<property>
<name>hadoop.tmp.dir</name>
<value>/hadoop</value>
</property>
<property>
<name>dfs.name.dir</name>
<value>/hadoop/name</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://127.0.0.1:9000</value>
</property>

hdfs-site.xml

<property>
<name>dfs.data.dir</name>
<value>/hadoop/data</value>
</property>

mapred-site.xml

<property>
<name>mapred.job.tracker</name>
<value>127.0.0.1:9001</value>
</property>

格式化

hadoop namenode -format

开启

start-all.sh

遇见的异常

1.运行Hadoop start-all.sh遇到的错误ssh: connect to host localhost port 22: Connection refused

sudo apt-get install openssh-server

2.root@localhost’s password:localhost:permission denied,please try again

1.修改root密码：#sudo passwd root

2.辑配置文件，允许以 root 用户通过 ssh 登录：sudo vi /etc/ssh/sshd_config

　找到：PermitRootLogin prohibit-password禁用

添加：PermitRootLogin yes

3.sudo service ssh restart

重新启动成功。