# Java environment setting

JAVA_HOME=/usr/java/default

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

PATH=$JAVA_HOME/bin:$PATH

JRE_HOME=$JAVA_HOME/jre

export JAVA_HOME CLASSPATH PATH JRE_HOME

# Maven configuration

M2_HOME=/usr/local/apache-maven/default

PATH=$PATH:$M2_HOME/bin

# hadoop setting

HADOOP_HOME=/home/asn/opt/hadoop-1.2.

PATH=$PATH:$HADOOP_HOME/bin

[asn@vm-centos6-asn opt]$ cat /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=vm-centos6-asn

[root@vm-centos6-asn ~]# cat /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 vm-centos6-asn

::         localhost localhost.localdomain localhost6 localhost6.localdomain6

 <?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://192.168.56.101:9000</value>

     </property>

     <property>

         <name>hadoop.tmp.dir</name>

         <value>/home/asn/opt/hadoop-tmp</value>

     </property>

 </configuration>

 <?xml version="1.0"?>

 <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

 <!-- Put site-specific property overrides in this file. -->

 <configuration>

     <property>

         <name>dfs.data.dir</name>

         <value>/home/asn/opt/hadoop-data</value>

     </property>

     <property>

         <name>dfs.replication</name>

         <value>1</value>

     </property>

 </configuration>

 <?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>192.168.56.101:9001</value>

     </property>

 </configuration>

[asn@vm-centos6-asn conf]$ cat hadoop-env.sh

# Set Hadoop-specific environment variables here.

JAVA_HOME环境变量必须配置，其他环境变量可选。 当运行一个分布式配置时，最好配置该文件中的JAVA_HOME环境变量，以便于在远程节点上被正确定义。

# 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.  Required.

export JAVA_HOME=/usr/java/default

# Extra Java CLASSPATH elements.  Optional.

# export HADOOP_CLASSPATH=

# The maximum amount of heap to use, in MB. Default is .

# export HADOOP_HEAPSIZE=

# Extra Java runtime options.  Empty by default.

# export HADOOP_OPTS=-server

[asn@vm-centos6-asn ~]$ ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/home/asn/.ssh/id_rsa):   私钥存放文件

Created directory '/home/asn/.ssh'.

Enter passphrase (empty for no passphrase):    直接回车

Enter same passphrase again:  直接回车

Your identification has been saved in /home/asn/.ssh/id_rsa.

Your public key has been saved in /home/asn/.ssh/id_rsa.pub.   公钥存放文件

The key fingerprint is:

6e::e0:::b5:6b:fb:::::1e:b2:8f: asn@vm-centos6-asn

The key's randomart image is:

+--[ RSA ]----+

|  ...     ..oo=  |

|   . .   .   = . |

|  . .   .   . . E|

|   . . .     o . |

|    = o S   . o  |

|   . = =     .   |

|    . + +        |

|     . +         |

|      .          |

+-----------------+

[asn@vm-centos6-asn ~]$ cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys   把公钥拷贝到认证文件中

[asn@vm-centos6-asn ~]$ ssh localhost

The authenticity of host 'localhost (::1)' can't be established.

RSA key fingerprint is bd:c8:f0:::be:ee:2f::6d::::d7:c0:.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added 'localhost' (RSA) to the list of known hosts.  首次连接提示是否把localhost添加到已知的主机列表中

Last login: Tue Dec  ::  from localhost

[asn@vm-centos6-asn ~]$ exit

logout

Connection to localhost closed.

[asn@vm-centos6-asn ~]$ ssh localhost      直接免密码登录成功

Last login: Tue Dec  ::  from localhost

[asn@vm-centos6-asn ~]$ 

[asn@vm-centos6-asn ~]$ start-all.sh

starting namenode, logging to /home/asn/opt/hadoop-1.2./libexec/../logs/hadoop-asn-namenode-vm-centos6-asn.out

localhost: starting datanode, logging to /home/asn/opt/hadoop-1.2./libexec/../logs/hadoop-asn-datanode-vm-centos6-asn.out

localhost: starting secondarynamenode, logging to /home/asn/opt/hadoop-1.2./libexec/../logs/hadoop-asn-secondarynamenode-vm-centos6-asn.out

starting jobtracker, logging to /home/asn/opt/hadoop-1.2./libexec/../logs/hadoop-asn-jobtracker-vm-centos6-asn.out

localhost: starting tasktracker, logging to /home/asn/opt/hadoop-1.2./libexec/../logs/hadoop-asn-tasktracker-vm-centos6-asn.out

[asn@vm-centos6-asn ~]$ jps

 Jps

 NameNode

 SecondaryNameNode

 JobTracker

 TaskTracker

 DataNode