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28d182506a
libvirt-guests is a perfect use case for bypassing the file system cache - lots of filesystem traffic done at system shutdown, where caching is pointless, and startup, where reading large files only once just gets in the way. Make this a configurable option in the init script, but defaulting to existing behavior. * tools/libvirt-guests.sysconf (BYPASS_CACHE): New variable. * tools/libvirt-guests.init.sh (start, suspend_guest): Use it.
376 lines
8.8 KiB
Bash
376 lines
8.8 KiB
Bash
#!/bin/sh
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# the following is the LSB init header
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#
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### BEGIN INIT INFO
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# Provides: libvirt-guests
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# Required-Start: libvirtd
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# Required-Stop: libvirtd
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: suspend/resume libvirt guests on shutdown/boot
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# Description: This is a script for suspending active libvirt guests
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# on shutdown and resuming them on next boot
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# See http://libvirt.org
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### END INIT INFO
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# the following is chkconfig init header
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#
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# libvirt-guests: suspend/resume libvirt guests on shutdown/boot
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#
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# chkconfig: 345 99 01
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# description: This is a script for suspending active libvirt guests \
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# on shutdown and resuming them on next boot \
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# See http://libvirt.org
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#
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sysconfdir="@sysconfdir@"
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localstatedir="@localstatedir@"
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libvirtd="@sbindir@"/libvirtd
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# Source function library.
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test ! -r "$sysconfdir"/rc.d/init.d/functions ||
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. "$sysconfdir"/rc.d/init.d/functions
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# Source gettext library.
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# Make sure this file is recognized as having translations: _("dummy")
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. "@bindir@"/gettext.sh
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export TEXTDOMAIN="@PACKAGE@" TEXTDOMAINDIR="@localedir@"
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URIS=default
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ON_BOOT=start
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ON_SHUTDOWN=suspend
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SHUTDOWN_TIMEOUT=0
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START_DELAY=0
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BYPASS_CACHE=0
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test -f "$sysconfdir"/sysconfig/libvirt-guests &&
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. "$sysconfdir"/sysconfig/libvirt-guests
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LISTFILE="$localstatedir"/lib/libvirt/libvirt-guests
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VAR_SUBSYS_LIBVIRT_GUESTS="$localstatedir"/lock/subsys/libvirt-guests
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RETVAL=0
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retval() {
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"$@"
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if [ $? -ne 0 ]; then
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RETVAL=1
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return 1
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else
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return 0
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fi
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}
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run_virsh() {
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uri=$1
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shift
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if [ "x$uri" = xdefault ]; then
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virsh "$@" </dev/null
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else
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virsh -c "$uri" "$@" </dev/null
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fi
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}
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run_virsh_c() {
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( export LC_ALL=C; run_virsh "$@" )
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}
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list_guests() {
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uri=$1
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list=$(run_virsh_c "$uri" list)
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if [ $? -ne 0 ]; then
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RETVAL=1
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return 1
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fi
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uuids=
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for id in $(echo "$list" | awk 'NR > 2 {print $1}'); do
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uuid=$(run_virsh_c "$uri" dominfo "$id" | awk '/^UUID:/{print $2}')
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if [ -z "$uuid" ]; then
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RETVAL=1
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return 1
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fi
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uuids="$uuids $uuid"
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done
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echo $uuids
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}
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guest_name() {
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uri=$1
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uuid=$2
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name=$(run_virsh_c "$uri" dominfo "$uuid" 2>/dev/null | \
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sed -ne 's/^Name: *//p')
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[ -n "$name" ] || name=$uuid
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echo "$name"
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}
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guest_is_on() {
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uri=$1
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uuid=$2
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guest_running=false
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info=$(run_virsh_c "$uri" dominfo "$uuid")
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if [ $? -ne 0 ]; then
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RETVAL=1
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return 1
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fi
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id=$(echo "$info" | awk '/^Id:/{print $2}')
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[ -n "$id" ] && [ "x$id" != x- ] && guest_running=true
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return 0
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}
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started() {
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touch "$VAR_SUBSYS_LIBVIRT_GUESTS"
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}
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start() {
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[ -f "$LISTFILE" ] || { started; return 0; }
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if [ "x$ON_BOOT" != xstart ]; then
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gettext "libvirt-guests is configured not to start any guests on boot"
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echo
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rm -f "$LISTFILE"
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started
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return 0
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fi
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isfirst=true
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bypass=
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test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
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while read uri list; do
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configured=false
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set -f
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for confuri in $URIS; do
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set +f
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if [ "x$confuri" = "x$uri" ]; then
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configured=true
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break
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fi
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done
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set +f
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if ! "$configured"; then
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eval_gettext "Ignoring guests on \$uri URI"; echo
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continue
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fi
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eval_gettext "Resuming guests on \$uri URI..."; echo
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for guest in $list; do
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name=$(guest_name "$uri" "$guest")
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eval_gettext "Resuming guest \$name: "
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if guest_is_on "$uri" "$guest"; then
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if "$guest_running"; then
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gettext "already active"; echo
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else
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if "$isfirst"; then
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isfirst=false
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else
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sleep $START_DELAY
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fi
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retval run_virsh "$uri" start $bypass "$name" \
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>/dev/null && \
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gettext "done"; echo
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fi
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fi
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done
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done <"$LISTFILE"
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rm -f "$LISTFILE"
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started
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}
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suspend_guest()
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{
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uri=$1
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guest=$2
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name=$(guest_name "$uri" "$guest")
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label=$(eval_gettext "Suspending \$name: ")
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bypass=
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test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
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printf %s "$label"
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run_virsh "$uri" managedsave $bypass "$guest" >/dev/null &
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virsh_pid=$!
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while true; do
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sleep 1
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kill -0 "$virsh_pid" >/dev/null 2>&1 || break
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progress=$(run_virsh_c "$uri" domjobinfo "$guest" 2>/dev/null | \
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awk '/^Data processed:/{print $3, $4}')
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if [ -n "$progress" ]; then
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printf '\r%s%12s ' "$label" "$progress"
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else
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printf '\r%s%-12s ' "$label" "..."
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fi
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done
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retval wait "$virsh_pid" && printf '\r%s%-12s\n' "$label" "$(gettext "done")"
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}
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shutdown_guest()
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{
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uri=$1
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guest=$2
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name=$(guest_name "$uri" "$guest")
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label=$(eval_gettext "Shutting down \$name: ")
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printf %s "$label"
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retval run_virsh "$uri" shutdown "$guest" >/dev/null || return
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timeout=$SHUTDOWN_TIMEOUT
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while [ "$timeout" -gt 0 ]; do
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sleep 1
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timeout=$((timeout - 1))
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guest_is_on "$uri" "$guest" || return
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"$guest_running" || break
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printf '\r%s%-12d ' "$label" "$timeout"
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done
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if guest_is_on "$uri" "$guest"; then
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if "$guest_running"; then
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printf '\r%s%-12s\n' "$label" \
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"$(gettext "failed to shutdown in time")"
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else
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printf '\r%s%-12s\n' "$label" "$(gettext "done")"
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fi
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fi
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}
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stop() {
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# last stop was not followed by start
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[ -f "$LISTFILE" ] && return 0
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suspending=true
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if [ "x$ON_SHUTDOWN" = xshutdown ]; then
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suspending=false
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if [ $SHUTDOWN_TIMEOUT -le 0 ]; then
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gettext "Shutdown action requested but SHUTDOWN_TIMEOUT was not set"
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echo
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RETVAL=6
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return
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fi
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fi
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: >"$LISTFILE"
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set -f
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for uri in $URIS; do
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set +f
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eval_gettext "Running guests on \$uri URI: "
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if [ "x$uri" = xdefault ] && [ ! -x "$libvirtd" ]; then
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gettext "libvirtd not installed; skipping this URI."; echo
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continue
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fi
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list=$(list_guests "$uri")
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if [ $? -eq 0 ]; then
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empty=true
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for uuid in $list; do
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"$empty" || printf ", "
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printf %s "$(guest_name "$uri" "$uuid")"
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empty=false
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done
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if "$empty"; then
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gettext "no running guests."; echo
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else
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echo
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echo "$uri" "$list" >>"$LISTFILE"
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fi
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fi
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done
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set +f
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while read uri list; do
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if "$suspending"; then
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eval_gettext "Suspending guests on \$uri URI..."; echo
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else
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eval_gettext "Shutting down guests on \$uri URI..."; echo
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fi
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for guest in $list; do
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if "$suspending"; then
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suspend_guest "$uri" "$guest"
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else
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shutdown_guest "$uri" "$guest"
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fi
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done
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done <"$LISTFILE"
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rm -f "$VAR_SUBSYS_LIBVIRT_GUESTS"
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}
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gueststatus() {
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set -f
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for uri in $URIS; do
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set +f
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echo "* $uri URI:"
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retval run_virsh "$uri" list || echo
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done
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set +f
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}
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# rh_status
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# Display current status: whether saved state exists, and whether start
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# has been executed. We cannot use status() from the functions library,
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# since there is no external daemon process matching this init script.
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rh_status() {
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if [ -f "$LISTFILE" ]; then
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gettext "stopped, with saved guests"; echo
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RETVAL=3
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else
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if [ -f "$VAR_SUBSYS_LIBVIRT_GUESTS" ]; then
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gettext "started"; echo
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else
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gettext "stopped, with no saved guests"; echo
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fi
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RETVAL=0
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fi
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}
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# usage [val]
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# Display usage string, then exit with VAL (defaults to 2).
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usage() {
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program_name=$0
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eval_gettext "Usage: \$program_name {start|stop|status|restart|"\
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"condrestart|try-restart|reload|force-reload|gueststatus|shutdown}"; echo
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exit ${1-2}
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}
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# See how we were called.
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if test $# != 1; then
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usage
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fi
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case "$1" in
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--help)
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usage 0
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;;
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start|stop|gueststatus)
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"$1"
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;;
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restart)
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stop && start
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;;
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condrestart|try-restart)
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[ -f "$VAR_SUBSYS_LIBVIRT_GUESTS" ] && stop && start
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;;
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reload|force-reload)
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# Nothing to do; we reread configuration on each invocation
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;;
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status)
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rh_status
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;;
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shutdown)
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ON_SHUTDOWN=shutdown
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stop
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;;
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*)
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usage
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;;
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esac
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exit $RETVAL
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