I have seen quite a few messages from people saying how easy it is to
simply copy a virtual server from one root host to another. While trivial
to do manually I have sometimes found it annoying to have to remember the
flags to rsync so that it doesn't cross filesystems, or have forgotten to
copy the config file across or whatever.
I also have a need to keep copies of virtual servers across different root
hosts as a warm-backup, and wanted a quick way to synchronise and stop &
start as needed from a script.
Since I haven't seen anybody else post such a thing I wrote a script which
I call "vcp" (attached) to do just that. Someone might find it useful -
feedback and/or enhancements are welcome. If it is useful enough to lots
of people then perhaps it will be picked up by Jacques...
Cheers, Mark.
--
Mark Lawrence ([EMAIL PROTECTED]) Mobile: +41 79 309 0633
#!/bin/sh
#
# Copyright (C) 2002, Mark Lawrence <[EMAIL PROTECTED]>.
# Licence: GPL
#
# vcp: Copy/Sync a virtual host from one machine to another
#
VERSION="0.1.0"
umask 022
### Helper functions ###
error () {
echo "E: $2" >&2
exit $1
}
warn () {
echo "W: $1" >&2
}
info () {
echo "I: $1"
}
### Usage/Info functions ###
usage () {
cat <<EOF 1>&2
Usage: ${0##*/} [-hVds] <vserver> <destination_host>
EOF
}
full_usage () {
usage
cat <<EOF
e.g. ${0##*/} -s mail01 rhost02
This script will copy the file system contents of a virtual server from
the localhost to another root host, optionally stopping the local and
starting the remote vservers as necessary to enact a virtual server move.
It relies on rsync and /usr/sbin/vserver, and assumes the standard
/etc/vservers/ and /vservers/ locations.
It can be used on a running virtual server without the "-s" option
to provide a "warm backup"
Options:
-h this help
-V copyright and version information
-d debug
-s stop the local vserver before copying, and start
it on the destination host afterwards
EOF
}
full_version () {
cat <<EOF
${0##*/} version $VERSION
Copyright (c) 2002 Mark Lawrence <[EMAIL PROTECTED]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
EOF
}
### Command line & setup ###
if [ $# -eq 0 ]; then # Script invoked with no command-line args?
usage
exit 1
fi
stopstart=(false)
vserver=""
dhost=""
shost=""
exec 3> /dev/null # for the debug option
shopt -s extglob
while getopts "hVsd" Option; do
case $Option in
h) full_usage
exit 1
;;
V) full_version
exit 1
;;
s) stopstart=(true)
;;
d) exec 3>&2
;;
*) usage
exit 1
;;
esac
done
# Decrements the argument pointer so it points to next argument.
shift $(($OPTIND - 1))
if (($# != 2)); then
usage
exit 1
fi
vserver=$1
vconf=/etc/vservers/$vserver.conf
vroot=/vservers/$vserver
dhost=$2
### Perform some sanity checks and do the copy ###
if [ ! -d $vroot ]; then
error 2 "Directory \"$vroot\" does not exist"
fi
if [ ! -r $vconf ]; then
error 2 "Vserver file \"$vconf\" does not exist"
fi
if (ssh $dhost /usr/sbin/vserver $vserver running | grep -q 'is running'); then
warn "vserver \"$vserver\" already running on host \"$dhost\""
error 3 "Cannot copy over a running vserver"
fi
if $stopstart; then
info "Stopping virtual server \"$vserver\" on localhost"
/usr/sbin/vserver $vserver stop 1>&3 2>&3
fi
info "Syncing files between hosts"
rsync -avxz $vroot/ $dhost:$vroot/ 1>&3 2>&3 # trailing slashes very important!
if (($?)); then
error $? "rsync failed"
fi
info "Syncing configuration file"
rsync -avxz $vconf $dhost:$vconf 1>&3 2>&3
if (($?)); then
error $? "rsync failed"
fi
if $stopstart; then
info "Starting virtual server \"$vserver\" on $dhost"
ssh $dhost /usr/sbin/vserver $vserver start 1>&3 2>&3
if (ssh $dhost /usr/sbin/vserver $vserver running | \
grep -q 'not running'); then
error 4 "Virtual server \"$vserver\" failed to start on $dhost"
fi
fi
exit 0
