8. 在各个结点上配置hadoop环境变量

[hadoop@node01 ~]$ su - root

Password:

[root@node01 ~]# vi /etc/profile

exportHADOOP_INSTALL=/home/hadoop/hadoop-0.20.2

export PATH=$PATH:$HADOOP_INSTALL/bin

9. 格式化HDFS

[hadoop@node01 bin]$ ./hadoop namenode-format

13/01/30 00:59:04 INFO namenode.NameNode:STARTUP_MSG:

/************************************************************

STARTUP_MSG: Starting NameNode

STARTUP_MSG: host = node01/192.168.231.131

STARTUP_MSG: args = [-format]

STARTUP_MSG: version = 0.20.2

STARTUP_MSG: build =https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707;compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010

************************************************************/

13/01/30 00:59:04 INFO namenode.FSNamesystem:fsOwner=hadoop,root

13/01/30 00:59:04 INFOnamenode.FSNamesystem: supergroup=supergroup

13/01/30 00:59:04 INFOnamenode.FSNamesystem: isPermissionEnabled=true

13/01/30 00:59:04 INFO common.Storage:Image file of size 96 saved in 0 seconds.

13/01/30 00:59:04 INFO common.Storage:Storage directory /tmp/hadoop-hadoop/dfs/name has been successfully formatted.

13/01/30 00:59:04 INFO namenode.NameNode:SHUTDOWN_MSG:

/************************************************************

SHUTDOWN_MSG: Shutting down NameNode atnode01/192.168.231.131

************************************************************/

10.启动守护进程

注意，在启动守护进程之前，一定要先关闭防火墙（所有的结点都要），否则datanode启动失败。

[root@node04 ~]# /etc/init.d/iptables stop

iptables: Flushing firewall rules: [ OK ]

iptables: Setting chains to policy ACCEPT:filter [ OK ]

iptables: Unloading modules: [ OK ]

最好设置开机就不启动防火墙：

[root@node01 ~]# vi /etc/sysconfig/selinux

SELINUX=disable

[hadoop@node01bin]$ ./start-all.sh

startingnamenode, logging to/home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-namenode-node01.out

node03:starting datanode, logging to/home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-datanode-node03.out

node02:starting datanode, logging to/home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-datanode-node02.out

node04:starting datanode, logging to/home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-datanode-node04.out

hadoop@node01'spassword:

node01:starting secondarynamenode, logging to/home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-secondarynamenode-node01.out

startingjobtracker, logging to/home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-jobtracker-node01.out

node03:starting tasktracker, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-tasktracker-node03.out

node02:starting tasktracker, logging to/home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-tasktracker-node02.out

node04:starting tasktracker, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-tasktracker-node04.out

检测守护进程启动情况：

Master结点：

[hadoop@node01 jdk1.6.0_38]$ /usr/java/jdk1.6.0_38/bin/jps

3986 Jps

3639 NameNode

3785 SecondaryNameNode

3858 JobTracker

Slave结点（以node02为例）：

[root@node02 ~]# /usr/java/jdk1.6.0_38/bin/jps

3254 TaskTracker

3175 DataNode

3382 Jps