Hadoop中hdfs启动

1.    在namenode机器上格式化 

Hdfs namenode –format

作用:创建了/opt/hadoop-2.5/dfs/name/current目录

并且初始化fsimage文件

-rw-r--r--. 1root root 351 Dec 23 05:44 fsimage_0000000000000000000

-rw-r--r--. 1root root  62 Dec 23 05:44fsimage_0000000000000000000.md5

-rw-r--r--. 1root root   2 Dec 23 05:44 seen_txid

-rw-r--r--. 1root root 206 Dec 23 05:44 VERSION

2.    启动

Cd /opt/hadoop-2.5/dfs/name/current

Start-dfs.sh

结果如下:

Startingnamenodes on [node1]

node1:starting namenode, logging to/home/hadoop-2.5.1/logs/hadoop-root-namenode-node1.out

node3:starting datanode, logging to/home/hadoop-2.5.1/logs/hadoop-root-datanode-node3.out

node2:starting datanode, logging to/home/hadoop-2.5.1/logs/hadoop-root-datanode-node2.out

node4:starting datanode, logging to/home/hadoop-2.5.1/logs/hadoop-root-datanode-node4.out

Startingsecondary namenodes [node2]

node2: starting secondarynamenode, loggingto /home/hadoop-2.5.1/logs/hadoop-root-secondarynamenode-node2.out

作用:通过namenode启动namenode和datenode(如未配置免密码登录,此处要手动输入密码),然后启动snn

3.    通过浏览器监控页面查看

http://192.168.24.129:50070

结果如下图