四，其他节点的安装
1， 将hadoo和java目录拷贝到其他三个节点对应目录下
scp -rHadoop da-free-test2:/work
scp -rhadoop da-free-test3:/work
scp -rhadoop da-free-test4:/work
scp -rjava da-free-test2:/work
scp -rjava da-free-test3:/work
scp -r java da-free-test4:/work
2， 修改三个节点的/etc/profile，加入以下语句并执行一遍。
exportJAVA_HOME=/work/java
exportJRE_HOME=$JAVA_HOME/jre
exportHADOOP_HOME=/work/hadoop
exportPATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin
至此，算是安装完成，之后遇到的都当问题来处理。
六，格式化文件系统
1， 遇到问题：
[root@da-free-test1bin]# ./hadoop namenode -format
Warning:$HADOOP_HOME is deprecated.
Error: dlfailure on line 875
Error:failed /work/java/jre/lib/i386/server/libjvm.so, because/work/java/jre/lib/i386/server/libjvm.so: cannot restore segment prot afterreloc: Permission denied
Error: dlfailure on line 875
Error: failed /work/java/jre/lib/i386/server/libjvm.so,because /work/java/jre/lib/i386/server/libjvm.so: cannot restore segment protafter reloc: Permission denied
解决方法：关闭selinux：
修改/etc/selinux/config
SELINUX=disabled
更改其他三个节点，并重启系统。
解决报警
Warning: $HADOOP_HOME is deprecated.
将刚才添加到/etc/profile中的关于$HADOOP_HOME的删除并重新登录。
2， 成功格式化
[root@da-free-test1~]# hadoop namenode -format
12/02/0812:01:21 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG:Starting NameNode
STARTUP_MSG: host = da-free-test1/172.16.18.202
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 1.0.0
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0-r 1214675; compiled by 'hortonfo' on Thu Dec 15 16:36:35 UTC 2011
************************************************************/
12/02/0812:01:21 INFO util.GSet: VM type =32-bit
12/02/0812:01:21 INFO util.GSet: 2% max memory = 35.55625 MB
12/02/0812:01:21 INFO util.GSet: capacity =2^23 = 8388608 entries
12/02/0812:01:21 INFO util.GSet: recommended=8388608, actual=8388608
12/02/0812:01:21 INFO namenode.FSNamesystem: fsOwner=root
12/02/0812:01:21 INFO namenode.FSNamesystem: supergroup=supergroup
12/02/0812:01:21 INFO namenode.FSNamesystem: isPermissionEnabled=true
12/02/0812:01:21 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
12/02/0812:01:21 INFO namenode.FSNamesystem: isAccessTokenEnabled=falseaccessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
12/02/0812:01:21 INFO namenode.NameNode: Caching file names occuring more than 10 times
12/02/0812:01:22 INFO common.Storage: Image file of size 110 saved in 0 seconds.
12/02/0812:01:22 INFO common.Storage: Storage directory /work/hadoopneed/name has beensuccessfully formatted.
12/02/0812:01:22 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG:Shutting down NameNode at da-free-test1/172.16.18.202
************************************************************/