3 # vcached: VServer cache allocator
5 # Description: A script that preallocates vservers and stores them in
6 # a cache. Preallocated vservers from the cache may be then used to
7 # instantiate real vservers. Requires that /var/run/vcached.pid does
8 # not exist on startup. Should run periodically as a cron job.
12 # Brent Chun - bnc@intel-research.net
13 # Tristan Koo - tristan.koo@intel-research.net
14 # William Wung - wungism@uclink.berkeley.edu
16 # Mark Huang <mlhuang@cs.princeton.edu>
17 # Copyright (c) 2004-2005 The Trustees of Princeton University
19 # $Id: vcached,v 1.10 2004/11/29 21:56:45 mlhuang Exp $
22 # number of images to keep cached
26 pidfile=/var/run/vcached.pid
29 logfile=/var/log/vcached.log
36 echo "usage: vcached [OPTION...]"
37 echo " -s [slots] number of images to keep cached"
38 echo " -p [pidfile] PID file"
39 echo " -l [logfile] log file"
45 while getopts 's:p:l:dh' OPT ; do
55 # append output to log file
59 # check if we are already running
60 if [ -f $pidfile ] && kill -0 `cat $pidfile` >/dev/null 2>&1 ; then
61 echo "vcached(`cat $pidfile`) already running"
66 # clean up lock file before exiting
67 trap "rm -f $pidfile" EXIT
69 : ${UTIL_VSERVER_VARS:=/usr/lib/util-vserver/util-vserver-vars}
70 test -e "$UTIL_VSERVER_VARS" || {
71 echo "Can not find util-vserver installation; aborting..."
74 . "$UTIL_VSERVER_VARS"
76 # make sure barrier bit is set on /vservers to prevent chroot() escapes
77 setattr --barrier $__DEFAULT_VSERVERDIR
80 rm -rf "$__DEFAULT_VSERVERDIR/.vtmp"
82 mkdir -p "$__DEFAULT_VSERVERDIR/.vcache"
83 mkdir -p "$__DEFAULT_VSERVERDIR/.vtmp"
85 [ $debug -ne 0 ] && echo "$(date) Checking the cache"
86 for i in $(seq 0 $(($slots - 1))) ; do
87 if [ ! -d "$__DEFAULT_VSERVERDIR/.vcache/v$i" ] ; then
88 echo "$(date) Caching v$i"
89 # build image in .vtmp
90 TMP=$(mktemp -d "$__DEFAULT_VSERVERDIR/.vtmp/v$i.XXXXXX")
91 "$__PKGLIBDIR/vbuild" "$__DEFAULT_VSERVERDIR/vserver-reference" "$TMP"
93 # move it to .vcache when complete
94 if [ $RETVAL -eq 0 ] ; then
96 vnewsize=$(du -s "$TMP" | awk "{ print \$1 }")
97 vrefsize=$(du -s "$__DEFAULT_VSERVERDIR/vserver-reference" | awk "{ print \$1 }")
98 if [ $vnewsize -lt $vrefsize ] ; then
99 echo "WARNING: Unexpected for 'du -s $__DEFAULT_VSERVERDIR/$NAME'=$vnewsize to be less than 'du -s $__DEFAULT_VSERVERDIR/vserver-reference'=$vrefsize"
102 mv "$TMP" "$__DEFAULT_VSERVERDIR/.vcache/v$i"
103 echo "$(date) v$i ready"
105 echo "$(date) Error $RETVAL building v$i"