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https://gitlab.com/libvirt/libvirt.git
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4e7fc8305a
I've noticed that in some cases systemd was quick enough and even if libvirt-guests.service is marked to be started after the libvirtd.service my guests were not resumed as libvirt-guests.sh failed to connect. This is because of a simple fact: systemd correctly starts libvirt-guests after it execs libvirtd. However, the daemon is not able to accept connections right from the start. It's doing some initialization which may take ages. This problem is not limited to systemd only, indeed. Any init system that is able to startup services in parallel (e.g. OpenRC) may run into this situation. The fix is to try connecting not only once, but continuously a few times with a small sleep in between tries. Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
599 lines
15 KiB
Bash
599 lines
15 KiB
Bash
#!/bin/sh
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# Copyright (C) 2011-2013 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see
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# <http://www.gnu.org/licenses/>.
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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=300
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PARALLEL_SHUTDOWN=0
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START_DELAY=0
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BYPASS_CACHE=0
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CONNECT_RETRIES=10
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RETRIES_SLEEP=1
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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 COMMAND ARGUMENTS...
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# run command with arguments and convert non-zero return value to 1 and set
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# the global return variable
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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 URI ARGUMENTS...
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# start virsh and let it execute ARGUMENTS on URI
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# If URI is "default" virsh is called without the "-c" argument
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# (using libvirt's default connection)
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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" "$@" </dev/null
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fi
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}
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# run_virsh_c URI ARGUMENTS
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# Same as "run_virsh" but the "C" locale is used instead of
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# the system's locale.
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run_virsh_c() {
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( export LC_ALL=C; run_virsh "$@" )
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}
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# test_connect URI
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# check if URI is reachable
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test_connect()
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{
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uri=$1
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for ((i = 0; i < ${CONNECT_RETRIES}; i++)); do
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run_virsh "$uri" connect 2>/dev/null
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if [ $? -eq 0 ]; then
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return 0;
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fi
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sleep ${RETRIES_SLEEP}
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eval_gettext "Unable to connect to libvirt currently. Retrying .. \$i"
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done
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eval_gettext "Can't connect to \$uri. Skipping."
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echo
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return 1
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}
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# list_guests URI PERSISTENT
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# List running guests on URI.
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# PERSISTENT argument options:
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# --persistent: list only persistent guests
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# --transient: list only transient guests
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# [none]: list both persistent and transient guests
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list_guests() {
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uri=$1
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persistent=$2
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list=$(run_virsh_c "$uri" list --uuid $persistent)
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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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echo $list
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}
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# guest_name URI UUID
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# return name of guest UUID on URI
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guest_name() {
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uri=$1
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uuid=$2
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run_virsh "$uri" domname "$uuid" 2>/dev/null
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}
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# guest_is_on URI UUID
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# check if guest UUID on URI is running
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# Result is returned by variable "guest_running"
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guest_is_on() {
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uri=$1
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uuid=$2
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guest_running=false
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id=$(run_virsh "$uri" domid "$uuid")
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if [ $? -ne 0 ]; then
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RETVAL=1
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return 1
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fi
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[ -n "$id" ] && [ "x$id" != x- ] && guest_running=true
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return 0
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}
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# started
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# Create the startup lock file
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started() {
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touch "$VAR_SUBSYS_LIBVIRT_GUESTS"
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}
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# start
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# Start or resume the guests
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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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test_connect "$uri" || continue
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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 URI GUEST
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# Do a managed save on a GUEST on URI. This function returns after the guest
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# was saved.
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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=$(eval_gettext "Suspending \$name: ")
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bypass=
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slept=0
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test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
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printf '%s...\n' "$label"
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run_virsh "$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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slept=$(($slept + 1))
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if [ $(($slept % 5)) -eq 0 ]; then
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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 '%s%s\n' "$label" "$progress"
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else
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printf '%s%s\n' "$label" "..."
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fi
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fi
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done
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retval wait "$virsh_pid" && printf '%s%s\n' "$label" "$(gettext "done")"
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}
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# shutdown_guest URI GUEST
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# Start a ACPI shutdown of GUEST on URI. This function return after the quest
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# was successfully shutdown or the timeout defined by $SHUTDOWN_TIMEOUT expires.
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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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eval_gettext "Starting shutdown on guest: \$name"
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echo
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retval run_virsh "$uri" shutdown "$guest" >/dev/null || return
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timeout=$SHUTDOWN_TIMEOUT
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check_timeout=false
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if [ $timeout -gt 0 ]; then
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check_timeout=true
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format=$(eval_gettext "Waiting for guest %s to shut down, %d seconds left\n")
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else
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slept=0
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format=$(eval_gettext "Waiting for guest %s to shut down\n")
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fi
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while ! $check_timeout || [ "$timeout" -gt 0 ]; do
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sleep 1
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guest_is_on "$uri" "$guest" || return
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"$guest_running" || break
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if $check_timeout; then
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if [ $(($timeout % 5)) -eq 0 ]; then
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printf "$format" "$name" "$timeout"
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fi
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timeout=$(($timeout - 1))
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else
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slept=$(($slept + 1))
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if [ $(($slept % 5)) -eq 0 ]; then
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printf "$format" "$name"
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fi
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fi
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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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eval_gettext "Shutdown of guest \$name failed to complete in time."
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else
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eval_gettext "Shutdown of guest \$name complete."
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fi
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echo
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fi
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}
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# shutdown_guest_async URI GUEST
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# Start a ACPI shutdown of GUEST on URI. This function returns after the command
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# was issued to libvirt to allow parallel shutdown.
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shutdown_guest_async()
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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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eval_gettext "Starting shutdown on guest: \$name"
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echo
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retval run_virsh "$uri" shutdown "$guest" > /dev/null
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}
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# guest_count GUEST_LIST
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# Returns number of guests in GUEST_LIST
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guest_count()
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{
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set -- $1
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echo $#
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}
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# check_guests_shutdown URI GUESTS
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# check if shutdown is complete on guests in "GUESTS" and returns only
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# guests that are still shutting down
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check_guests_shutdown()
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{
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uri=$1
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guests=$2
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guests_up=
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for guest in $guests; do
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if ! guest_is_on "$uri" "$guest" >/dev/null 2>&1; then
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eval_gettext "Failed to determine state of guest: \$guest. Not tracking it anymore."
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echo
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continue
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fi
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if "$guest_running"; then
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guests_up="$guests_up $guest"
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fi
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done
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echo "$guests_up"
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}
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# print_guests_shutdown URI BEFORE AFTER
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# Checks for differences in the lists BEFORE and AFTER and prints
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# a shutdown complete notice for guests that have finished
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print_guests_shutdown()
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{
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uri=$1
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before=$2
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after=$3
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for guest in $before; do
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case " $after " in
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*" $guest "*) continue;;
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esac
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name=$(guest_name "$uri" "$guest")
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eval_gettext "Shutdown of guest \$name complete."
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echo
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done
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}
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# shutdown_guests_parallel URI GUESTS
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# Shutdown guests GUESTS on machine URI in parallel
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shutdown_guests_parallel()
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{
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uri=$1
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guests=$2
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on_shutdown=
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check_timeout=false
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timeout=$SHUTDOWN_TIMEOUT
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if [ $timeout -gt 0 ]; then
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check_timeout=true
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format=$(eval_gettext "Waiting for %d guests to shut down, %d seconds left\n")
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else
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slept=0
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format=$(eval_gettext "Waiting for %d guests to shut down\n")
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fi
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while [ -n "$on_shutdown" ] || [ -n "$guests" ]; do
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while [ -n "$guests" ] &&
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[ $(guest_count "$on_shutdown") -lt "$PARALLEL_SHUTDOWN" ]; do
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set -- $guests
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guest=$1
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shift
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guests=$*
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shutdown_guest_async "$uri" "$guest"
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on_shutdown="$on_shutdown $guest"
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done
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sleep 1
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set -- $guests
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guestcount=$#
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set -- $on_shutdown
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shutdowncount=$#
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if $check_timeout; then
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if [ $(($timeout % 5)) -eq 0 ]; then
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printf "$format" $(($guestcount + $shutdowncount)) "$timeout"
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fi
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timeout=$(($timeout - 1))
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if [ $timeout -le 0 ]; then
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eval_gettext "Timeout expired while shutting down domains"; echo
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RETVAL=1
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return
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fi
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else
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slept=$(($slept + 1))
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if [ $(($slept % 5)) -eq 0 ]; then
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printf "$format" $(($guestcount + $shutdowncount))
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fi
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fi
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on_shutdown_prev=$on_shutdown
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on_shutdown=$(check_guests_shutdown "$uri" "$on_shutdown")
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print_guests_shutdown "$uri" "$on_shutdown_prev" "$on_shutdown"
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done
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}
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# stop
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# Shutdown or save guests on the configured uris
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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 [ $SHUTDOWN_TIMEOUT -lt 0 ]; then
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gettext "SHUTDOWN_TIMEOUT must be equal or greater than 0"
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echo
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RETVAL=6
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return
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fi
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fi
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: >"$LISTFILE"
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set -f
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for uri in $URIS; do
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set +f
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test_connect "$uri" || continue
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eval_gettext "Running guests on \$uri URI: "
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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."
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fi
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echo
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fi
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if "$suspending"; then
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transient=$(list_guests "$uri" "--transient")
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if [ $? -eq 0 ]; then
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empty=true
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for uuid in $transient; do
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if "$empty"; then
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eval_gettext "Not suspending transient guests on URI: \$uri: "
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empty=false
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else
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printf ", "
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fi
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printf %s "$(guest_name "$uri" "$uuid")"
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done
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echo
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# reload domain list to contain only persistent guests
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list=$(list_guests "$uri" "--persistent")
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if [ $? -ne 0 ]; then
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eval_gettext "Failed to list persistent guests on \$uri"
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echo
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RETVAL=1
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set +f
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return
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fi
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else
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gettext "Failed to list transient guests"
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echo
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RETVAL=1
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set +f
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return
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fi
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fi
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if [ -n "$list" ]; then
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echo "$uri" "$list" >>"$LISTFILE"
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fi
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done
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set +f
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if [ -s "$LISTFILE" ]; then
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while read uri list; do
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if "$suspending"; then
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eval_gettext "Suspending guests on \$uri URI..."; echo
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else
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eval_gettext "Shutting down guests on \$uri URI..."; echo
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fi
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if [ "$PARALLEL_SHUTDOWN" -gt 1 ] &&
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! "$suspending"; then
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shutdown_guests_parallel "$uri" "$list"
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else
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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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fi
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done <"$LISTFILE"
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else
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rm -f "$LISTFILE"
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fi
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rm -f "$VAR_SUBSYS_LIBVIRT_GUESTS"
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}
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# gueststatus
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# List status of guests
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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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RETVAL=0
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else
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gettext "stopped, with no saved guests"; echo
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RETVAL=3
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fi
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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).
|
|
usage() {
|
|
program_name=$0
|
|
eval_gettext "Usage: \$program_name {start|stop|status|restart|"\
|
|
"condrestart|try-restart|reload|force-reload|gueststatus|shutdown}"; echo
|
|
exit ${1-2}
|
|
}
|
|
|
|
# See how we were called.
|
|
if test $# != 1; then
|
|
usage
|
|
fi
|
|
case "$1" in
|
|
--help)
|
|
usage 0
|
|
;;
|
|
start|stop|gueststatus)
|
|
"$1"
|
|
;;
|
|
restart)
|
|
stop && start
|
|
;;
|
|
condrestart|try-restart)
|
|
[ -f "$VAR_SUBSYS_LIBVIRT_GUESTS" ] && stop && start
|
|
;;
|
|
reload|force-reload)
|
|
# Nothing to do; we reread configuration on each invocation
|
|
;;
|
|
status)
|
|
rh_status
|
|
;;
|
|
shutdown)
|
|
ON_SHUTDOWN=shutdown
|
|
stop
|
|
;;
|
|
*)
|
|
usage
|
|
;;
|
|
esac
|
|
exit $RETVAL
|