Hadoop安装过程
还是记录一下hadoop的安装过程吧，每次都查- -!， 版本是Cloudera的 hadoop-0.20.2-cdh3u1
1.配置/etc/hosts
master 和 slave 配置相同的hosts
10.0.10.24 hadoop1 10.0.10.25 hadoop2 10.0.10.26 hadoop3
2.创建Hadoop用户
groupadd hadoop useradd -g hadoop hadoop passwd hadoop cd /data/ mkdir hadoop mkdir hadoopdata chown hadoop:hadoop -R hadoop chown hadoop:hadoop -R hadoopdata
3.ssh配置
su - hadoop ssh-keygen -t rsa cd $HOME/.ssh cp id_rsa.pub authorized_keys hadoop1# ssh-copy-id -i $HOME/.ssh/id_rsa.pub hadoop@hadoop2 hadoop1# ssh-copy-id -i $HOME/.ssh/id_rsa.pub hadoop@hadoop3 hadoop2# ssh-copy-id -i $HOME/.ssh/id_rsa.pub hadoop@hadoop1 hadoop3# ssh-copy-id -i $HOME/.ssh/id_rsa.pub hadoop@hadoop1 ssh -o StrictHostKeyChecking=no hadoop1 ssh -o StrictHostKeyChecking=no hadoop2 ssh -o StrictHostKeyChecking=no hadoop3
4.环境变量
vi /etc/profile export HADOOP_HOME=/data/hadoop export PATH=$HADOOP_HOME/bin:$PATH source /etc/profile
5.Hadoop配置
cd $HADOOP_HOME/conf
hadoop-env.sh
export JAVA_HOME=/usr/java/jdk1.6.0_22/
core-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/data/hadoop/tmp</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://hadoop1:9000</value>
</property>
</configuration>hdfs-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.name.dir</name>
<value>/data/hadoopdata/name</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>/data/hadoopdata/data</value>
</property>
<property>
<name>dfs.block.size</name>
<value>33554432</value>
</property>
</configuration>mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>hadoop1:9001</value>
</property>
</configuration>masters
hadoop1
slaves
hadoop1 hadoop2 hadoop3
6.格式化
cd $HADOOP_HOME/bin ./hadoop namenode -format
7.启动
./start-all.sh