Linux下搭建Hadoop详细步骤
装好虚拟机+Linux，并且主机网络和虚拟机网络互通。以及Linux上装好JDK
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１：在Linux下输入命令vi /etc/profile 添加HADOOP_HOME
export JAVA_HOME=/home/hadoop/export/jdk
export HADOOP_HOME=/home/hadoop/export/hadoop
export PATH=.:$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin
２：修改hadoop/conf目录下面hadoop-env.sh第九行
export JAVA_HOME=/home/hadoop/export/jdk
3：修改hadoop/conf目录下面core-site.xml
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/.../tmp</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://127.0.0.1:9000</value>
</property>
</configuration>
4：修改hadoop/conf目录下面hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
5：修改hadoop/conf目录下面mapred-site.xml
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>127.0.0.1:9001</value>
</property>
</configuration>
修改完成。
转到hadoop/bin下面输入hadoop namenode -format
出现如下：（说明成功）
Warning: $HADOOP_HOME is deprecated.
14/07/15 16:06:27 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = ubuntu/127.0.1.1
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 1.2.1
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG: java = 1.7.0_55
************************************************************/
14/07/15 16:07:09 INFO util.GSet: Computing capacity for map BlocksMap
14/07/15 16:07:09 INFO util.GSet: VM type = 32-bit
14/07/15 16:07:09 INFO util.GSet: 2.0% max memory = 1013645312
14/07/15 16:07:09 INFO util.GSet: capacity = 2^22 = 4194304 entries
14/07/15 16:07:09 INFO util.GSet: recommended=4194304, actual=4194304
14/07/15 16:07:10 INFO namenode.FSNamesystem: fsOwner=hadoop
14/07/15 16:07:10 INFO namenode.FSNamesystem: supergroup=supergroup
14/07/15 16:07:10 INFO namenode.FSNamesystem: isPermissionEnabled=true
14/07/15 16:07:10 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
14/07/15 16:07:10 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
14/07/15 16:07:10 INFO namenode.FSEditLog: dfs.namenode.edits.toleration.length = 0
14/07/15 16:07:10 INFO namenode.NameNode: Caching file names occuring more than 10 times
14/07/15 16:07:10 INFO common.Storage: Image file /home/hadoop/tmp/dfs/name/current/fsimage of size 118 bytes saved in 0 seconds.
14/07/15 16:07:10 INFO namenode.FSEditLog: closing edit log: position=4, editlog=/home/hadoop/tmp/dfs/name/current/edits
14/07/15 16:07:10 INFO namenode.FSEditLog: close success: truncate to 4, editlog=/home/hadoop/tmp/dfs/name/current/edits
14/07/15 16:07:10 INFO common.Storage: Storage directory /home/hadoop/tmp/dfs/name has been successfully formatted.
14/07/15 16:07:10 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at ubuntu/127.0.1.1
************************************************************/