Fixing shutdown problem in hardy

For a long time my ubuntu box can't shutdown properly(not sure when this start to happen may be since upgrade to gusty). Shutdown progress bar will stop running, harddrive already stop spinning and hang. I guess it because my kernel option "acpi=off nolapic irqpoll" in /boot/grub/menu.lst without these option shutdown script work perfect. So, why i need that??
I just found the way to fix this from ubuntuforums. This is not new, many guy has this problem and it fixed. To solve this problem [for me]

1.add "apm=power_off" to kernel option.
2.add "apm power_off=1" to /etc/modules

Reboot and try shutdown again this time it work perfect.

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Too many open files

Last week tomcat log file report many error about "Too many open files" when it has high traffic. Some in catalina_log say 2007-04-07 16:13:40 HttpProcessor[80][272] Starting background thread 2007-04-07 16:13:40 HttpConnector[80] accept: java.net.SocketException: Too many open files and here is from localhost_log 2007-04-07 16:13:40 StandardWrapperValve[myservlet]: Servlet.service() for servlet myservlet threw exception java.io.FileNotFoundException: /home/log/mylog_070407.log (Too many open files) This is because too many file descriptors're opened by tomcat. File descriptor can be limited in both system level and shell level. To check maximum number of fd in system type 'cat /proc/sys/fs/file-max'. In my case it is 65536(someone said it should set to 200000). Tomcat error when try to open socket number 272 so I think 65536 is ok for me for now. Anyway if u want to set it add 'fs.file-max = 200000' to /etc/sysctl.conf pnix@pnix-a7:~$ cat /proc/sys/fs/fil...

Setup MySQL with Ofbiz

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