Re: Tools to calculate memory usage per jail

Miroslav Lachman <[email protected]> Wed, 03 Jun 2009 12:40:09 +0200

Newsgroups	gmane.os.freebsd.isp
Message-ID	<[email protected]>

Marc G. Fournier wrote:
> 
> Subject says it all ... does anyone know of / have such a tool?

I am using some modified shell script - jps. It is based on Oliver 
Fromme http://www.secnetix.de/~olli/scripts/jps

My version is attached. If jps is called with JID param, you get list of 
processes of given jail and summary like this:

==============================
  summary for JID 6 / tester1.example.com
  %MEM    RSS       VSZ   %CPU
    5    221064   1034648   0

It is far from perfect tool, but it is enough to my needs.

Or you can ask on [email protected] list, where are more skilled 
peoples around jails :)

[Stef Walter is working on bsnmp-jails, maybe he is able to extend it 
for memory usage too]

Miroslav Lachman

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jps (text/plain, 1.6 KB)

#!/bin/sh -
#
#   Copyright (C) 2007 Oliver Fromme <[email protected]> <[email protected]>
#   All rights reserverd.  Standard 2-clause BSD license and disclaimer apply.
#
#   List processes that are running inside a jail.
#   This is intended to complement the standard jls(8) command.
#
#   Usage:
#      jps            list all jailed processes
#      jps <JID>      list only processes in jail <JID>.
#
#   Run the jls(8) command to get a list of jails and JIDs.
#
#   Note:  This script works for FreeBSD >= 6 only!
#   For FreeBSD 4.x, please use jailstat instead:
#   http://www.secnetix.de/~olli/scripts/jailstat
#

ME="${0##*/}"

Usage()
{
	cat <<-tac

		$ME  --  List processes that are running inside a jail.
		This is intended to complement the standard jls(8) command.

		Usage:
		$ME            list all jailed processes
		$ME <JID>      list only processes in jail <JID>

		Run the jls(8) command to get a list of jails and JIDs.

	tac
	exit 1
}

if [ $# -gt 2 ]; then
	Usage
fi

if [ $# -eq 1 ]; then
	case "$1" in
		""|*[!0-9]*)	Usage ;;
	esac
	FILTER='$1=="'$1'"'
	sum_jid="$1"
	jname=`jls | awk "$FILTER"'{ print $3 }'`
else
	FILTER='$1!="0"'
	sum_jid="all"
	jname="-"
fi

ps -axww -o jid,pid,%mem,rss,user,command | awk '$1!~/[0-9]/||'"$FILTER" | sort -n

echo
echo "=============================="
echo " summary for JID $sum_jid / $jname"
echo " %MEM    RSS       VSZ   %CPU "

## NOTE: jail processes can be swapped (%mem & rss are zero, but vsz not)
ps -axww -o jid,%mem,rss,vsz,%cpu | awk '$1!~/[0-9]/||'"$FILTER" | awk '{ sm += $2; sp += $3; sv += $4; sc += $5 } END { printf(" %3d %9i %9i %3d \n", sm, sp, sv, sc) }'

#--