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
22 PATH=/sbin:/usr/sbin:$PATH
24 # number of images to keep cached
28 pidfile=/var/run/vcached.pid
31 logfile=/var/log/vcached.log
38 echo "usage: vcached [OPTION...]"
39 echo " -s [slots] number of images to keep cached"
40 echo " -p [pidfile] PID file"
41 echo " -l [logfile] log file"
47 while getopts 's:p:l:dh' OPT ; do
57 # append output to log file
61 # check if we are already running
62 if [ -f $pidfile ] && kill -0 `cat $pidfile` >/dev/null 2>&1 ; then
63 echo "vcached(`cat $pidfile`) already running"
68 # clean up lock file before exiting
69 trap "rm -f $pidfile" EXIT
71 : ${UTIL_VSERVER_VARS:=/usr/lib/util-vserver/util-vserver-vars}
72 test -e "$UTIL_VSERVER_VARS" || {
73 echo "Can not find util-vserver installation; aborting..."
76 . "$UTIL_VSERVER_VARS"
78 # make sure barrier bit is set on /vservers to prevent chroot() escapes
79 setattr --barrier $__DEFAULT_VSERVERDIR
82 #rm -rf "$__DEFAULT_VSERVERDIR/.vtmp"
84 mkdir -p "$__DEFAULT_VSERVERDIR/.vcache"
85 mkdir -p "$__DEFAULT_VSERVERDIR/.vtmp"
87 [ $debug -ne 0 ] && echo "$(date) Checking the cache"
88 for i in $(seq 0 $(($slots - 1))) ; do
89 if [ ! -d "$__DEFAULT_VSERVERDIR/.vcache/v$i" ] ; then
90 echo "$(date) Caching v$i"
91 # build image in .vtmp
92 TMP=$(mktemp -d "$__DEFAULT_VSERVERDIR/.vtmp/v$i.XXXXXX")
93 "$_VCLONE" "$__DEFAULT_VSERVERDIR/.vref/default/" "$TMP"/
95 # move it to .vcache when complete
96 if [ $RETVAL -eq 0 ] ; then
97 mv "$TMP" "$__DEFAULT_VSERVERDIR/.vcache/v$i"
98 echo "$(date) v$i ready"
100 echo "$(date) Error $RETVAL building v$i"