检测hadoop程序的小技巧
这里总结一些检测hadoop是否正常启动的一些小技巧1：查看hadoop的进程，利用java自带的jps
例如在master上执行后的输出
$ jps
6652 Sancho
3813
9760 Jps
9629 SecondaryNameNode
9451 NameNode
$
在slaves上执行的输出
$ jps
2210 Jps
2137 DataNode
$
2：检测监听端口是否启动，利用netstat
例如我需要检测54310是否开启并且有连接进来
$ netstat -altnp | fgrep 54310
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 ::ffff:10.0.18.105:54310 :::* LISTEN 9451/java
tcp 0 0 ::ffff:10.0.18.105:37804 ::ffff:10.0.18.105:54310 TIME_WAIT -
tcp 0 0 ::ffff:10.0.18.105:54310 ::ffff:10.0.18.121:40535 ESTABLISHED 9451/java
tcp 0 0 ::ffff:10.0.18.105:54310 ::ffff:10.0.18.122:51895 ESTABLISHED 9451/java
3：检测master 和slaves之间的端口访问控制
例如在slaves上telnet master的 54310端口 或者在 master上telnet slaves的 50010 端口
$ telnet 10.0.18.105 54310
Trying 10.0.18.105...
Connected to 10.0.18.105.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
$
$ telnet 10.0.18.122 50010
Trying 10.0.18.122...
Connected to 10.0.18.122.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
$
如果telnet可以通的话 会提示说：
Escape character is '^]'.
然后输入 ctrl + ］进入telnet命令提示符 然后quit 就退出了。
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