topic Re: How to trace a process? in Operating System - HP-UX

How to trace a process?

zhaogui — Thu, 11 Jul 2002 07:31:25 GMT

I don't how does one process got started since it is not in cron job and also not in /sbin/init.d, there is only one entry in /etc/inetd.conf:
tftp dgram udp wait root /usr/lbin/tftpd tftpd /opt/ignite /var/opt/ignite

# ps -ef|grep tftp
root 24525 694 237 May 30 ? 3663:55 tftpd /opt/ignite /var/opt/ignite
root 7595 7580 0 01:24:36 pts/tc 0:00 grep tftp

And one thing I am worried about is that it consumes 95% of CPU and load level is very high. Once I killed it, the load level from "top" droped significantly. On my another server there is still tftpd running and I want to find out how did it get started, anyone can help me?

Thanks,

Re: How to trace a process?

Tom Geudens — Thu, 11 Jul 2002 07:39:17 GMT

Hi,
There's probably another system using the trivial ftp protocol to ftp to / from your system (in my humble opinion). You could check with "netstat -an" which system is connecting to your tftp port (you can find that in /etc/services, probably going to be 69).

Hope this gets you started ...
Regards,
Tom

Re: How to trace a process?

Rainer von Bongartz — Thu, 11 Jul 2002 07:40:12 GMT

tftpd is started by inetd whenever a request is put to port
69 (tftp) from any host on your lan

Regards
Rainer

Re: How to trace a process?

V. V. Ravi Kumar_1 — Thu, 11 Jul 2002 07:53:29 GMT

hi,

use lsof to identify which process is invoking tftp, u can use
lsof -i:tftp

then kill that process
regds

Re: How to trace a process?

zhaogui — Thu, 11 Jul 2002 07:56:28 GMT

I couldn't find out anything with port 69 from "netstat -an
". Could tftpd be started by make_tape_recovery since tftpd got something to do with Ignite/UX as it is shown in /etc/inetd.conf? I tried on another old server and even there is a same entry for tftpd in inetd.conf, I didn't find tftpd running even after I rebooted the server. So how do I know how did it get started?

Re: How to trace a process?

zhaogui — Thu, 11 Jul 2002 08:12:37 GMT

# lsof -i:tftp
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
inetd 694 root 7u inet 0x4844a268 0t0 UDP *:tftp (Idle)
tftpd 24525 root 0u inet 0x4844a268 0t0 UDP *:tftp (Idle)
tftpd 24525 root 1u inet 0x4844a268 0t0 UDP *:tftp (Idle)
tftpd 24525 root 2u inet 0x4844a268 0t0 UDP *:tftp (Idle)

Re: How to trace a process?

Tom Geudens — Thu, 11 Jul 2002 08:20:17 GMT

Hi,
For tftp to work there should be a tftp user in /etc/passwd. Is it there on the systems that have the problem ?

Regards,
Tom

Re: How to trace a process?

zhaogui — Thu, 11 Jul 2002 08:29:42 GMT

No tftp in /etc/passwd

Re: How to trace a process?

Rainer von Bongartz — Thu, 11 Jul 2002 08:34:43 GMT

According to the manual you should add something like

tftp:*:510:101:tftp server:/home/tftpdir:/usr/bin/false

Regards
Rainer

Re: How to trace a process?

zhaogui — Thu, 11 Jul 2002 08:40:09 GMT

No. I don't use tftp. That is I got a surprise when I saw tftpd is running there and eat up a lot of CPU resource and that even affect our application.

So now I want to investigate how did that happen?

Re: How to trace a process?

T G Manikandan — Thu, 11 Jul 2002 09:00:03 GMT

tftp comes along with the ignite bundle.
tftp is used for network related operations using ignite like instl_adm,make_net_recovery.
When the client is booted up using the bootp protocol the server uses tftp to push files to the client.

If you are just using make_tape_recovery or make_recovery of the ignite product tftp is not required.might be you can comment it in the inetd.conf file.Later if you need it you can enable it.

Also performing a recovery using a local tape drive should not cause a problem.

Thanks

Re: How to trace a process?

zhaogui — Thu, 11 Jul 2002 23:33:45 GMT

Now tftpd is still running on one of my servers, is tehre any way to find out how did it get started?
# ps -ef|grep tftp
root 24525 694 255 May 30 ? 4552:11 tftpd /opt/ignite /var/opt/ignite
In cron job list there is only one script running "make_tape_recovery". Besides this I don't know what program triggered tftpd. The parent process of tftpd is inetd, but it should be triggered by something else. What is that?