如何在ubuntu上安装hadoop
\u600e\u4e48\u5728ubuntu\u4e0a\u5b89\u88c5hadoop1\u3001\u521b\u5efahadoop\u7ba1\u7406\u5458\u5e10\u53f7
\u76f4\u63a5\u5728\u7ec8\u7aef\u6267\u884c\u5982\u4e0b\u547d\u4ee4\u884c\uff1a
1 sudo adduser hadoop
\u7136\u540e\u8981\u6c42\u4f60\u8bbe\u7f6ehadoop\u5e10\u6237\u5bc6\u7801\uff0c\u8fd9\u4e2a\u547d\u4ee4\u662f\u6dfb\u52a0\u4e00\u4e2a\u540d\u4e3ahadoop\u7684\u6807\u51c6\u5e10\u6237\uff0c\u6211\u4eec\u9700\u8981\u7684\u662f\u7ba1\u7406\u5458\u5e10\u53f7
\u53ef\u4ee5\u76f4\u63a5\u5728\u56fe\u5f62\u754c\u9762\u4e0b\u4fee\u6539hadoop\u6743\u9650\uff0c\u5c06\u9f20\u6807\u70b9\u51fb\u53f3\u4e0a\u89d2\u7684\u4e00\u4e2a\u4eba\u5934\u5904\uff0c\u6d6e\u73b0\u5217\u8868\uff0c\u70b9\u51fb\u201c\u7528\u6237\u8d26\u6237\u201d\uff0c\u89e3\u9501\uff0c\u7136\u540e\u66f4\u6539\u4e3a\u7ba1\u7406\u5458\u6743\u9650
2\u3001\u5b89\u88c5ssh\u670d\u52a1
ssh\u53ef\u4ee5\u5b9e\u73b0\u8fdc\u7a0b\u767b\u5f55\u548c\u7ba1\u7406\uff0c\u8be6\u7ec6\u60c5\u51b5\u8bf7google\u767e\u5ea6
ubuntu\u9ed8\u8ba4\u5e76\u6ca1\u6709\u5b89\u88c5ssh\u670d\u52a1\uff0c\u5982\u679c\u901a\u8fc7ssh\u94fe\u63a5ubuntu\uff0c\u9700\u8981\u81ea\u5df1\u624b\u52a8\u5b89\u88c5ssh-server\u3002\u547d\u4ee4\u884c\uff1a
1 sudo apt-get install ssh openssh-server
3\u3001ssh\u65e0\u5bc6\u7801\u9a8c\u8bc1\u767b\u5f55
\u521b\u5efassh-key\uff0c\u8fd9\u91cc\u6211\u4eec\u91c7\u7528rsa\u65b9\u5f0f\uff0c\u547d\u4ee4\u884c\u5982\u4e0b\uff1a
1 ssh-keygen -t rsa -P ""
\u51fa\u73b0\u4e00\u4e2a\u56fe\u5f62\uff0c\u51fa\u73b0\u7684\u56fe\u5f62\u5c31\u662f\u5bc6\u7801\uff0c\u4e0d\u7528\u7ba1\u5b83
1 cat ~/.ssh/id_rsa.pub >> authorized_keys
\u7136\u540e\u5373\u53ef\u65e0\u5bc6\u7801\u9a8c\u8bc1\u767b\u5f55\u4e86\uff0c\u5982\u4e0b\uff1a
1 ssh localhost
\u9000\u51fa\u547d\u4ee4\u884c\u4e3a\uff1a
exit
4\u3001\u89e3\u538bhadoop\u6e90\u7801\u5305
\u7ec8\u7aef\u4e0b\u8fdb\u5165hadoop\u6e90\u7801\u5305\u6240\u5728\u76ee\u5f55\uff0c\u4f7f\u7528\u590d\u5236\u547d\u4ee4\u628ahadoop\u6e90\u7801\u5305\u590d\u5236\u5230/home/hadoop\u4e0b
1 cp hadoop-1.2.1.tar.gz /home/hadoop
\u7136\u540e\u89e3\u538b,\u547d\u4ee4\u884c\u5982\u4e0b
tar -xzvf *.tag.gz
5\u3001\u914d\u7f6ehadoop\u7684hadoop/conf\u4e0b\u7684hadoop-env.sh\uff0ccore-site.xml\uff0cmapred-site.xml\uff0chdfs-site.xml
\u914d\u7f6ehadoop-1.2.1/conf/hadoop-env.sh\uff0c\u547d\u4ee4\u884c\uff1a
1 gedit /home/hadoop/hadoop-1.2.1/conf/hadoop-env.sh
ctrl + f \u641c\u7d22\u5230JAVA_HOME
\u628a\u524d\u9762\u7684#\u53bb\u6389\uff0c\u52a0\u4e0a\u672c\u7cfb\u7edfjdk\u8def\u5f84\uff0c\u4fdd\u5b58\u9000\u51fa
\u914d\u7f6ehadoop-1.2.1/conf/core-site.xml\uff0c\u547d\u4ee4\u884c\uff1a
gedit /home/hadoop/hadoop-1.2.1/conf/core-site.xml
\u5728hadoop\u65b0\u5efahadoop_tmp\u76ee\u5f55\uff0c
\u5c06\u5982\u4e0b \u4e4b\u95f4\u7684\u6dfb\u52a0\u8fdb\u5165\uff0c\u4fdd\u5b58\u9000\u51fa
fs.default.name
hdfs://localhost:9000
hadoop.tmp.dir
/home/hadoop/hadoop-1.2.1/hadoop_tmp
A base for other temporary directories.
\u914d\u7f6ehadoop-1.2.1/conf/mapre-site.xml\uff0c\u547d\u4ee4\u884c\uff1a
1 gedit /home/hadoop/hadoop-1.2.1/conf/mapre-site.xml.xml
\u5c06\u5982\u4e0b \u4e4b\u95f4\u7684\u6dfb\u52a0\u8fdb\u5165\uff0c\u4fdd\u5b58\u9000\u51fa
mapred.job.tracker
localhost:9001
\u914d\u7f6ehadoop-1.2.1/conf/hdfs-site.xml\uff0c\u547d\u4ee4\u884c\uff1a
1 gedit /home/hadoop/hadoop-1.2.1/conf/hdfs-site.xml
\u5c06\u5982\u4e0b \u4e4b\u95f4\u7684\u6dfb\u52a0\u8fdb\u5165\uff0c\u4fdd\u5b58\u9000\u51fa
dfs.replication
1
\u81f3\u6b64hadoop\u7684\u5b89\u88c5\u914d\u7f6e\u5df2\u7ecf\u5b8c\u6bd5\uff0c\u7a0d\u540e\u7684\u662fhadoop\u7684\u521d\u6b21\u8fd0\u884c\u64cd\u4f5c
6\u3001\u683c\u5f0f\u5316hdfs\u6587\u4ef6\u7cfb\u7edf
\u8fdb\u5165hadoop-1.2.1
/bin/hadoop namenode -format
7\u3001\u542f\u52a8hadoop\u670d\u52a1
/bin/start-all.sh
\u51fa\u73b0\u5982\u4e0b\u753b\u9762
jps
jps\u662f\u67e5\u770bjava\u865a\u62df\u673a\u8fd0\u884c\u7684java\u7ebf\u7a0b
\u7136\u540e\u51fa\u73b0\u5982\u4e0b\u753b\u9762
\u4e0d\u8ba1jps\uff0c\u6709\u4e94\u4e2ahadoop\u76f8\u5173\u7ebf\u7a0b\uff0c\u606d\u559c\u4f60\uff0chadoop\u5b89\u88c5\u914d\u7f6e\u6210\u529f\uff0c\u8fd0\u884c\u6b63\u5e38\u3002
\u7136\u540e\u53ef\u4ee5\u9000\u51fahadoop\u3002\uff0c\u4ee5\u540e\u518d\u7528\u65f6\u518d\u542f\u52a8\uff0c\u5bfc\u5165\u6570\u636e
hadoop\u5b98\u65b9\u7f51\u7ad9\u5bf9\u5176\u5b89\u88c5\u914d\u7f6ehadoop\u7684\u6b65\u9aa4\u592a\u7c97\u7565\uff0c\u5728\u8fd9\u7bc7\u535a\u5ba2\u4e2d\uff0c\u6211\u4f1a\u8be6\u7ec6\u4ecb\u7ecd\u5728ubuntu\u4e2d\u5982\u4f55\u5b89\u88c5hadoop\uff0c\u5e76\u5904\u7406\u53ef\u80fd\u51fa\u73b0\u7684\u4e00\u4e9b\u95ee\u9898\u3002\u8fd9\u91cc\u4ecb\u7ecd\u7684\u65b9\u6cd5\u662f\u7528\u4e00\u53f0\u673a\u5668\u865a\u62df\u591a\u4e2a\u8282\u70b9\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u5df2\u5728\u5982\u4e0b\u73af\u5883\u4e2d\u6d4b\u8bd5\u901a\u8fc7\uff1a
OS: Ubuntu 13.10
Hadoop: 2.2.0 (2.x.x)
\u4e2a\u4eba\u8ba4\u4e3a\u5728\u5176\u4ed6\u7248\u672c\u4e0a\u5b89\u88c5Hadoop 2.x.x\u7684\u65b9\u6cd5\u57fa\u672c\u76f8\u540c\uff0c\u56e0\u6b64\u5982\u679c\u4e25\u683c\u6309\u7167\u6211\u7ed9\u7684\u6b65\u9aa4\uff0c\u5e94\u8be5\u4e0d\u4f1a\u6709\u95ee\u9898\u3002
\u524d\u63d0
\u5b89\u88c5 jdk \u548c openssh
$ sudo apt-get install openjdk-7-jdk
$ java -version
java version "1.7.0_55"
OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1~0.13.10.1)
OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)
$ sudo apt-get install openssh-server
openjdk\u7684\u9ed8\u8ba4\u8def\u5f84\u662f /usr/lib/jvm/java-7-openjdk-amd64. \u5982\u679c\u4f60\u7684\u9ed8\u8ba4\u8def\u5f84\u548c\u6211\u7684\u4e0d\u540c\uff0c\u8bf7\u518d\u540e\u9762\u7684\u64cd\u4f5c\u4e2d\u66ff\u6362\u6b64\u8def\u5f84\u3002
\u6dfb\u52a0Hadoop\u7528\u6237\u7ec4\u548c\u7528\u6237
$ sudo addgroup hadoop
$ sudo adduser --ingroup hadoop hduser
$ sudo adduser hduser sudo
\u7136\u540e\u5207\u6362\u5230hduser\u8d26\u6237
\u914d\u7f6eSSH
\u73b0\u5728\u4f60\u5728hduser\u8d26\u6237\u4e2d\u3002 \u8bf7\u6ce8\u610f\u4e0b\u9762\u547d\u4ee4\u4e2d '' \u662f\u4e24\u4e2a\u5355\u5f15\u53f7 \u2018
$ ssh-keygen -t rsa -P ''
\u5c06public key\u52a0\u5165\u5230authorized_keys\u4e2d\uff0c\u8fd9\u6837hadoop\u5728\u8fd0\u884cssh\u65f6\u5c31\u4e0d\u9700\u8981\u8f93\u5165\u5bc6\u7801\u4e86
$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
\u73b0\u5728\u6211\u4eec\u6d4b\u8bd5\u4e00\u4e0bssh
$ ssh localhost
\u5982\u679c\u4f60\u88ab\u8be2\u95ee\u662f\u5426\u786e\u8ba4\u8fde\u63a5\uff0c\u8f93\u5165yes\u3002\u5982\u679c\u4f60\u53d1\u73b0\u5728\u5373\u4e0d\u9700\u8981\u8f93\u5bc6\u7801\uff0ccool -- \u81f3\u5c11\u5230\u76ee\u524d\u4f4d\u7f6e\u4f60\u662f\u6b63\u786e\u7684\u3002\u5426\u5219\uff0c\u8bf7debug\u3002
$ exit
\u4e0b\u8f7dHadoop 2.2.0 (2.x.x)
$ cd ~
$ wget http://www.trieuvan.com/apache/hadoop/common/hadoop-2.2.0/hadoop-2.2.0.tar.gz
$ sudo tar -xzvf hadoop-2.2.0.tar.gz -C /usr/local
$ cd /usr/local
$ sudo mv hadoop-2.2.0 hadoop
$ sudo chown -R hduser:hadoop hadoop
\u914d\u7f6eHadoop\u73af\u5883
$ cd ~
$ vim .bashrc
\u5c06\u4e0b\u9762\u7684\u5185\u5bb9\u590d\u5236\u5230.bashrc\u4e2d
#Hadoop variables
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
export HADOOP_INSTALL=/usr/local/hadoop
export PATH=$PATH:$HADOOP_INSTALL/bin
export PATH=$PATH:$HADOOP_INSTALL/sbin
export HADOOP_MAPRED_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_HOME=$HADOOP_INSTALL
export HADOOP_HDFS_HOME=$HADOOP_INSTALL
export YARN_HOME=$HADOOP_INSTALL
###end of paste
$ cd /usr/local/hadoop/etc/hadoop
$ vim hadoop-env.sh
\u5c06\u4e0b\u9762\u7684\u4e09\u884c\u52a0\u5165\u5230hadoop-env.sh\u4e2d\uff0c\u5220\u9664\u539f\u6765\u7684 "export JAVA_HOME"\u90a3\u884c
# begin of paste
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/
export HADOOP_COMMON_LIB_NATIVE_DIR="/usr/local/hadoop/lib/native/"
export HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=/usr/local/hadoop/lib/"
### end of paste
\u914d\u7f6eHadoop
$ cd /usr/local/hadoop/etc/hadoop
$ vim core-site.xml
\u5c06\u4e0b\u9762\u7684\u5185\u5bb9\u590d\u5236\u5230 \u6807\u7b7e\u5185
fs.default.name
hdfs://localhost:9000
$ vim yarn-site.xml
\u5c06\u4e0b\u9762\u7684\u5185\u5bb9\u590d\u5236\u5230 \u6807\u7b7e\u5185
yarn.nodemanager.aux-services
mapreduce_shuffle
yarn.nodemanager.aux-services.mapreduce.shuffle.class
org.apache.hadoop.mapred.ShuffleHandler
$ mv mapred-site.xml.template mapred-site.xml
$ vim mapred-site.xml
\u5c06\u4e0b\u9762\u7684\u5185\u5bb9\u590d\u5236\u5230 \u6807\u7b7e\u5185
mapreduce.framework.name
yarn
$ mkdir -p ~/mydata/hdfs/namenode
$ mkdir -p ~/mydata/hdfs/datanode
$ vim hdfs-site.xml
\u5c06\u4e0b\u9762\u7684\u5185\u5bb9\u590d\u5236\u5230 \u6807\u7b7e\u5185
dfs.replication
1
dfs.namenode.name.dir
file:/home/hduser/mydata/hdfs/namenode
dfs.datanode.data.dir
file:/home/hduser/mydata/hdfs/datanode
\u683c\u5f0f\u5316 namenode
\u7b2c\u4e00\u6b21\u542f\u52a8hadoop\u670d\u52a1\u4e4b\u524d\uff0c\u5fc5\u987b\u6267\u884c\u683c\u5f0f\u5316namenode
$ hdfs namenode -format
\u542f\u52a8\u670d\u52a1
$ start-dfs.sh && start-yarn.sh
\u4f7f\u7528jps\u67e5\u770b\u670d\u52a1
$ jps
\u5982\u679c\u4e00\u5207\u987a\u5229\uff0c\u4f60\u4f1a\u770b\u5230\uff1a
17785 SecondaryNameNode
17436 NameNode
17591 DataNode
18096 NodeManager
17952 ResourceManager
23635 Jps
\u5f53\u6267\u884cstart-dfs.sh\u7684\u65f6\u5019\uff0c\u4f60\u53ef\u80fd\u4f1a\u770b\u5230 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable \uff0c\u4e0d\u7528\u62c5\u5fc3\uff0c\u5176\u5b9e\u53ef\u4ee5\u6b63\u5e38\u4f7f\u7528\uff0c\u6211\u4eec\u4f1a\u5728trouble shooting\u90a3\u4e00\u8282\u8c08\u5230\u8fd9\u4e2a\u95ee\u9898\u3002
\u6d4b\u8bd5\u5e76\u8fd0\u884c\u793a\u4f8b
$ cd /usr/local/hadoop
$ hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.2.0-tests.jar TestDFSIO -write -nrFiles 20 -fileSize 10
$ hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.2.0-tests.jar TestDFSIO -clean
$ hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar pi 2 5
\u7f51\u9875\u754c\u9762
Cluster status: http://localhost:8088
HDFS status: http://localhost:50070
Secondary NameNode status: http://localhost:50090
Trouble-shooting
1. Unable to load native-hadoop library for your platform.
\u8fd9\u662f\u4e00\u4e2a\u8b66\u544a\uff0c\u57fa\u672c\u4e0d\u4f1a\u5f71\u54cdhadoop\u7684\u4f7f\u7528\uff0c\u4f46\u662f\u5728\u4e4b\u540e\u6211\u4eec\u8fd8\u662f\u7ed9\u4e88\u89e3\u51b3\u8fd9\u4e2awarning\u7684\u65b9\u6cd5\u3002\u901a\u5e38\u6765\u8bb2\uff0c\u51fa\u73b0\u8fd9\u4e2awarning\u7684\u539f\u56e0\u662f\u4f60\u572864\u4f4d\u7684\u7cfb\u7edf\u4e0a\uff0c\u4f46\u662fhadoop\u7684package\u662f\u4e3a32\u4f4d\u7684\u673a\u5668\u7f16\u8bd1\u7684\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u786e\u8ba4\u4f60\u4e0d\u8981\u5fd8\u8bb0\u5728hadoop-env.sh\u4e2d\u52a0\u5165\u8fd9\u51e0\u884c\uff1a
export HADOOP_COMMON_LIB_NATIVE_DIR="/usr/local/hadoop/lib/native/"
export HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=/usr/local/hadoop/lib/"
\u5426\u5219\u4f60\u7684hadoop\u4e0d\u80fd\u6b63\u5e38\u5de5\u4f5c\u3002\u5982\u679c\u4f60\u7528\u7684\u7cfb\u7edf\u548chadoop\u7684package\u76f8\u7b26(32\u4f4d)\uff0c\u8fd9\u4e24\u884c\u662f\u4e0d\u5fc5\u8981\u7684\u3002
\u6211\u4eec\u4e0d\u5e0c\u671b\u6709warning\uff0c\u5982\u4f55\u89e3\u51b3\uff1f\u65b9\u6cd5\u662f\u81ea\u5df1\u91cd\u65b0\u7f16\u8bd1\u6e90\u4ee3\u7801\u3002\u91cd\u65b0\u7f16\u8bd1\u5176\u5b9e\u5f88\u7b80\u5355\uff1a
\u5b89\u88c5 maven
$ sudo apt-get install maven
\u5b89\u88c5 protobuf-2.5.0 or later
$ curl -# -O https://protobuf.googlecode.com/files/protobuf-2.5.0.tar.gz
$ tar -xzvf protobuf-2.5.0.tar.gz
$ cd protobuf-2.5.0
$ ./configure --prefix=/usr
$ make
$ sudo make install
$ cd ..
\u73b0\u5728\u5e76\u7f16\u8bd1hadoop\u6e90\u4ee3\u7801\uff0c\u6ce8\u610f\u7f16\u8bd1\u4e4b\u524d\u9700\u8981\u5148\u7ed9\u6e90\u4ee3\u7801\u6253\u4e2a\u8865\u4e01
$ wget http://www.eu.apache.org/dist/hadoop/common/stable/hadoop-2.2.0-src.tar.gz
$ tar -xzvf hadoop-2.2.0-src.tar.gz
$ cd hadoop-2.2.0-src
$ wget https://issues.apache.org/jira/secure/attachment/12614482/HADOOP-10110.patch
$ patch -p0 < HADOOP-10110.patch
$ mvn package -Pdist,native -DskipTests -Dtar
\u73b0\u5728\u5230 hadoop-dist/target/ \u76ee\u5f55\u4e0b, \u4f60\u4f1a\u770b\u5230 hadoop-2.2.0.tar.gz or hadoop-2.2.0, \u4ed6\u4eec\u5c31\u662f\u7f16\u8bd1\u540e\u7684hadoop\u5305\u3002 \u4f60\u53ef\u4ee5\u4f7f\u7528\u81ea\u5df1\u7f16\u8bd1\u7684\u5305\uff0c\u540c\u6837\u6309\u7167\u4e4b\u524d\u7684\u6b65\u9aa4\u5b89\u88c564\u4f4d\u7684hadoop\u3002\u5982\u679c\u4f60\u5df2\u7ecf\u5b89\u88c5\u4e8632\u4f4d\u7684hadoop\uff0c\u53ea\u9700\u8981\u66ff\u6362 /usr/local/hadoop/lib/native \u76ee\u5f55\uff0c\u7136\u540e\u5c06\u5982\u4e0b\u4e24\u884c\u4ecehadoop-env.sh\u4e2d\u79fb\u9664\u5373\u53ef\uff1a
export HADOOP_COMMON_LIB_NATIVE_DIR="/usr/local/hadoop/lib/native/"
export HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=/usr/local/hadoop/lib/"
2. datanode \u4e0d\u80fd\u88ab\u542f\u52a8
\u4e00\u4e2a\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u5148\u5220\u6389datanode\u5bf9\u5e94\u7684\u6587\u4ef6\u5939\u8bd5\u8bd5\uff0c\u6ce8\u610f\u8fd9\u6837\u505a\u53ef\u80fd\u4f1a\u4e22\u5931\u4f60\u7684\u6570\u636e\u3002\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u5230 /usr/local/hadoop/logs/hadoop-hduser-datanode-*.log \u4e2d\u68c0\u67e5\u539f\u56e0\u5e76\u5bf9\u75c7\u4e0b\u836f\u3002
直接在终端执行如下命令行：
1 sudo adduser hadoop
然后要求你设置hadoop帐户密码，这个命令是添加一个名为hadoop的标准帐户，我们需要的是管理员帐号
可以直接在图形界面下修改hadoop权限，将鼠标点击右上角的一个人头处，浮现列表，点击“用户账户”，解锁，然后更改为管理员权限
2、安装ssh服务
ssh可以实现远程登录和管理，详细情况请google百度
ubuntu默认并没有安装ssh服务，如果通过ssh链接ubuntu，需要自己手动安装ssh-server。命令行：
1 sudo apt-get install ssh openssh-server
3、ssh无密码验证登录
创建ssh-key，这里我们采用rsa方式，命令行如下：
1 ssh-keygen -t rsa -P ""
出现一个图形，出现的图形就是密码，不用管它
1 cat ~/.ssh/id_rsa.pub >> authorized_keys
然后即可无密码验证登录了，如下：
1 ssh localhost
退出命令行为：
exit
4、解压hadoop源码包
终端下进入hadoop源码包所在目录，使用复制命令把hadoop源码包复制到/home/hadoop下
1 cp hadoop-1.2.1.tar.gz /home/hadoop
然后解压,命令行如下
tar -xzvf *.tag.gz
5、配置hadoop的hadoop/conf下的hadoop-env.sh，core-site.xml，mapred-site.xml，hdfs-site.xml
配置hadoop-1.2.1/conf/hadoop-env.sh，命令行：
1 gedit /home/hadoop/hadoop-1.2.1/conf/hadoop-env.sh
ctrl + f 搜索到JAVA_HOME
把前面的#去掉，加上本系统jdk路径，保存退出
配置hadoop-1.2.1/conf/core-site.xml，命令行：
gedit /home/hadoop/hadoop-1.2.1/conf/core-site.xml
在hadoop新建hadoop_tmp目录，
将如下<configuration> </configuration>之间的添加进入，保存退出
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/hadoop/hadoop-1.2.1/hadoop_tmp</value>
<description>A base for other temporary directories.</description>
</property>
</configuration>
配置hadoop-1.2.1/conf/mapre-site.xml，命令行：
1 gedit /home/hadoop/hadoop-1.2.1/conf/mapre-site.xml.xml
将如下<configuration> </configuration>之间的添加进入，保存退出
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>localhost:9001</value>
</property>
</configuration>
配置hadoop-1.2.1/conf/hdfs-site.xml，命令行：
1 gedit /home/hadoop/hadoop-1.2.1/conf/hdfs-site.xml
将如下<configuration> </configuration>之间的添加进入，保存退出
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
至此hadoop的安装配置已经完毕，稍后的是hadoop的初次运行操作
6、格式化hdfs文件系统
进入hadoop-1.2.1
/bin/hadoop namenode -format
7、启动hadoop服务
/bin/start-all.sh
出现如下画面
jps
jps是查看java虚拟机运行的java线程
然后出现如下画面
不计jps，有五个hadoop相关线程，恭喜你，hadoop安装配置成功，运行正常。
然后可以退出hadoop。，以后再用时再启动，导入数据
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