Finding the age of a unix process, killing old processes, killing zombie processes Post: 302412948

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Top Forums Shell Programming and Scripting Finding the age of a unix process, killing old processes, killing zombie processes Post 302412948 by sukerman on Wednesday 14th of April 2010 04:48:15 AM

04-14-2010

Registered User

Finding the age of a unix process, killing old processes, killing zombie processes

I had issues with processes locking up. This script checks for processes and kills them if they are older than a certain time.

Its uses some functions you'll need to define or remove, like slog() which I use for logging, and is_running() which checks if this script is already running so you can add it to cron without running multiple copies.

Hope this helps someone ;-)

Jack.

Code:

#!/usr/bin/php
<?
    if (is_running()) die();

    slog("monitor started",2);

    while(true){
        check_process("convert"); // kill convert processes over 5 minutes old (default)
        check_process("bash",1440); // kill bash processes over 1440 minutes old
        check_process("qmail-smtpd",30); // kill qmail-smtpd processes over 30 minutes old
        sleep(300);
    }

    function cmd($cmd){
        $fp = popen($cmd, 'r');
        $ret="";
        while ($read = fread($fp, 2096)) $ret = $ret.$read;
        pclose($fp);
        return $ret;
    }
    function kill_pid($pid){
        slog("kill_pid: killing [$pid]",2);
        posix_kill($pid,1);
    }
    function check_process($cmd,$max_runtime=5) {
        $now = getdate();
        $h = $now['hours'];
        $m = $now['minutes'];
        $nowtime = ($h*3600)+($m*60);
        $x = cmd("ps h -fC $cmd");
        if ($x){
            $x = explode("\n",$x);
            foreach($x as $l){
                if ($l){
                    while (strstr($l,"  ")) $l = str_replace("  "," ",$l);
                    list($owner,$pid,$ppid,$c,$stime,$tty,$s,$time,$cmd) = explode(" ",$l);
                    if (!strstr($stime,":")) {
                        slog("check_process: $cmd : STIME [$stime] - more than a day old",2);
                        kill_pid($pid);
                    } else {
                        slog("check_process: $cmd : check runtime");
                        list($sh,$sm) = explode(":",$stime);
                        $runtime = ($sh*3600)+($sm*60);
                        $diff = ($nowtime - $runtime)/60;
                        if ($diff>$max_runtime){
                            slog("check_process: $cmd : STIME [$stime] now [$h:$m] - over $max_runtime minutes since start",2);
                            kill_pid($pid);
                        } else slog("check_process: $cmd : STIME [$stime] now [$h:$m] - running $diff/$max_runtime minutes",2);
                    }
                }
            }
        } else slog("check_process: $cmd : no processes",2);
    }
?>

Last edited by sukerman; 04-14-2010 at 06:10 AM.. Reason: Added script shebang incase you didn't realise its php

sukerman

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LEARN ABOUT REDHAT

killall

KILLALL(1)							   User Commands							KILLALL(1)

NAME

       killall - kill processes by name

SYNOPSIS

       killall [-e,--exact] [-g,--process-group] [-i,--interactive] [-q,--quiet] [-v,--verbose] [-w,--wait] [-V,--version] [-S,--sid] [-c,--con-
       text] [-s,--signal signal] [--] name ...
       killall -l
       killall -V,--version

DESCRIPTION

       killall sends a signal to all processes running any of the specified commands. If no signal name is specified, SIGTERM is sent.

       Signals can be specified either by name (e.g. -HUP) or by number (e.g. -1).

       If the command name contains a slash (/), processes executing that particular file will be selected for killing, independent of their name.

       killall returns a zero return code if at least one process has been killed for each ilisted command. killall returns zero otherwise.

       A killall process never kills itself (but may kill other killall processes).

OPTIONS

       -e, --exact
	      Require an exact match for very long names. If a command name is longer than 15 characters, the full name may be	unavailable  (i.e.
	      it  is  swapped  out). In this case, killall will kill everything that matches within the first 15 characters. With -e, such entries
	      are skipped.  killall prints a message for each skipped entry if -v is specified in addition to -e,

       -g, --process-group
	      Kill the process group to which the process belongs. The kill signal is only sent once per group, even if multiple processes belong-
	      ing to the same process group were found.

       -i, --interactive
	      Interactively ask for confirmation before killing.

       -l, --list
	      List all known signal names.

       -q, --quiet
	      Do not complain if no processes were killed.

       -v, --verbose
	      Report if the signal was successfully sent.

       -V, --version
	      Display version information.

       -w, --wait
	      Wait  for all killed processes to die. killall checks once per second if any of the killed processes still exist and only returns if
	      none are left.  Note that killall may wait forever if the signal was ignored, had no effect, or  if  the	process  stays	in  zombie
	      state.

       -S     (Flask  only) Specify SID: kill only processes with given SID. Mutually exclusive with -c argument.  Must precede other arguments on
	      command line.

       -c     (Flask only) Specify security context: kill only processes with given security context.  Mutually exclusive with -s.   Must  precede
	      other arguments on the command line.

FILES

       /proc	 location of the proc file system

KNOWN BUGS

       Killing by file only works for executables that are kept open during execution, i.e. impure executables can't be killed this way.

       Be warned that typing killall name may not have the desired effect on non-Linux systems, especially when done by a privileged user.

       killall -w doesn't detect if a process disappears and is replaced by a new process with the same PID between scans.

AUTHORS

       Werner  Almesberger  <Werner.Almesberger@epfl.ch>  wrote  the original version of psmisc.  Since version 20 Craig Small <csmall@small.drop-
       bear.id.au> can be blamed.

SEE ALSO

       kill(1), fuser(1), pgrep(1), pidof(1), ps(1), kill(2)

Linux								  March 25, 2001							KILLALL(1)

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