utilities/ovs-lib.in

   1 # -*- sh -*-
   2 # vi:syntax=sh
   3 # This is a shell function library sourced by some Open vSwitch scripts.
   4 # It is not intended to be invoked on its own.
   5
   6 # Copyright (C) 2009, 2010, 2011, 2012 Nicira, Inc.
   7 #
   8 # Licensed under the Apache License, Version 2.0 (the "License");
   9 # you may not use this file except in compliance with the License.
  10 # You may obtain a copy of the License at:
  11 #
  12 #     http://www.apache.org/licenses/LICENSE-2.0
  13 #
  14 # Unless required by applicable law or agreed to in writing, software
  15 # distributed under the License is distributed on an "AS IS" BASIS,
  16 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17 # See the License for the specific language governing permissions and
  18 # limitations under the License.
  19
  20 ## ----------------- ##
  21 ## configure options ##
  22 ## ----------------- ##
  23
  24 # All of these should be substituted by the Makefile at build time.
  25 logdir=${OVS_LOGDIR-'@LOGDIR@'}                 # /var/log/openvswitch
  26 rundir=${OVS_RUNDIR-'@RUNDIR@'}                 # /var/run/openvswitch
  27 sysconfdir=${OVS_SYSCONFDIR-'@sysconfdir@'}     # /etc
  28 etcdir=$sysconfdir/openvswitch                  # /etc/openvswitch
  29 datadir=${OVS_PKGDATADIR-'@pkgdatadir@'}        # /usr/share/openvswitch
  30 bindir=${OVS_BINDIR-'@bindir@'}                 # /usr/bin
  31 sbindir=${OVS_SBINDIR-'@sbindir@'}              # /usr/sbin
  32
  33 # /etc/openvswitch or /var/lib/openvswitch
  34 if test X"$OVS_DBDIR" != X; then
  35     dbdir=$OVS_DBDIR
  36 elif test X"$OVS_SYSCONFDIR" != X; then
  37     dbdir=$OVS_SYSCONFDIR/openvswitch
  38 else
  39     dbdir='@DBDIR@'
  40 fi
  41
  42 ovs_ctl_log () {
  43     echo "$@" >> "${logdir}/ovs-ctl.log"
  44 }
  45
  46 ovs_ctl () {
  47     case "$@" in
  48         *"=strace"*)
  49             # In case of running the daemon with strace, piping the o/p causes
  50             # the script to block (strace probably does not close the inherited
  51             # pipe). So, do not log the o/p to ovs-ctl.log.
  52             "${datadir}/scripts/ovs-ctl" "$@"
  53         ;;
  54         "status")
  55             # In case of the command 'status', we should return the exit status
  56             # of ovs-ctl. It is also useful to document the o/p in ovs-ctl.log.
  57             display=`"${datadir}/scripts/ovs-ctl" "$@" 2>&1`
  58             rc=$?
  59             if test -w "${logdir}/ovs-ctl.log"; then
  60                  echo "${display}" | tee -a "${logdir}/ovs-ctl.log"
  61             else
  62                  echo "${display}"
  63             fi
  64             return ${rc}
  65         ;;
  66         *)
  67             echo "`date -u`:$@" >> "${logdir}/ovs-ctl.log"
  68             "${datadir}/scripts/ovs-ctl" "$@" 2>&1 | tee -a "${logdir}/ovs-ctl.log"
  69         ;;
  70     esac
  71 }
  72
  73 VERSION='@VERSION@'
  74
  75 DAEMON_CWD=/
  76
  77 LC_ALL=C; export LC_ALL
  78
  79 ## ------------- ##
  80 ## LSB functions ##
  81 ## ------------- ##
  82
  83 # Use the system's own implementations if it has any.
  84 if test -e /etc/init.d/functions; then
  85     . /etc/init.d/functions
  86 elif test -e /etc/rc.d/init.d/functions; then
  87     . /etc/rc.d/init.d/functions
  88 elif test -e /lib/lsb/init-functions; then
  89     . /lib/lsb/init-functions
  90 fi
  91
  92 # Implement missing functions (e.g. OpenSUSE lacks 'action').
  93 if type log_success_msg >/dev/null 2>&1; then :; else
  94     log_success_msg () {
  95         printf '%s.\n' "$*"
  96     }
  97 fi
  98 if type log_failure_msg >/dev/null 2>&1; then :; else
  99     log_failure_msg () {
 100         printf '%s ... failed!\n' "$*"
 101     }
 102 fi
 103 if type log_warning_msg >/dev/null 2>&1; then :; else
 104     log_warning_msg () {
 105         printf '%s ... (warning).\n' "$*"
 106     }
 107 fi
 108 if type action >/dev/null 2>&1; then :; else
 109     action () {
 110        STRING=$1
 111        shift
 112        "$@"
 113        rc=$?
 114        if test $rc = 0; then
 115             log_success_msg "$STRING"
 116        else
 117             log_failure_msg "$STRING"
 118        fi
 119        return $rc
 120     }
 121 fi
 122
 123 ## ------- ##
 124 ## Daemons ##
 125 ## ------- ##
 126
 127 pid_exists () {
 128     # This is better than "kill -0" because it doesn't require permission to
 129     # send a signal (so daemon_status in particular works as non-root).
 130     test -d /proc/"$1"
 131 }
 132
 133 pid_comm_check () {
 134     [ "$1" = "`cat /proc/$2/comm`" ]
 135 }
 136
 137 # version_geq version_a version_b
 138 #
 139 # Compare (dot separated) version numbers.  Returns true (exit code 0) if
 140 # version_a is greater or equal than version_b, otherwise false (exit code 1).
 141 version_geq() {
 142     echo $1 $2 | awk '{
 143         n1 = split($1, a, ".");
 144         n2 = split($2, b, ".");
 145         n = (n1 > n2) ? n1 : n2;
 146         for (i = 1; i <= n; i++) {
 147             if (a[i]+0 < b[i]+0) exit 1
 148             if (a[i]+0 > b[i]+0) exit 0
 149         }
 150     }'
 151 }
 152
 153 install_dir () {
 154     DIR="$1"
 155     INSTALL_MODE="${2:-755}"
 156     INSTALL_USER="root"
 157     INSTALL_GROUP="root"
 158     [ "$OVS_USER" != "" ] && INSTALL_USER="${OVS_USER%:*}"
 159     [ "${OVS_USER##*:}" != "" ] && INSTALL_GROUP="${OVS_USER##*:}"
 160
 161     if test ! -d "$DIR"; then
 162         install -d -m "$INSTALL_MODE" -o "$INSTALL_USER" -g "$INSTALL_GROUP" "$DIR"
 163         restorecon "$DIR" >/dev/null 2>&1
 164     fi
 165 }
 166
 167 start_daemon () {
 168     priority=$1
 169     wrapper=$2
 170     shift; shift
 171     daemon=$1
 172     strace=""
 173
 174     # drop core files in a sensible place
 175     install_dir "$DAEMON_CWD"
 176     set "$@" --no-chdir
 177     cd "$DAEMON_CWD"
 178
 179     # log file
 180     install_dir "$logdir" "750"
 181     set "$@" --log-file="$logdir/$daemon.log"
 182
 183     # pidfile and monitoring
 184     install_dir "$rundir"
 185     set "$@" --pidfile="$rundir/$daemon.pid"
 186     set "$@" --detach
 187     test X"$MONITOR" = Xno || set "$@" --monitor
 188
 189     # wrapper
 190     case $wrapper in
 191         valgrind)
 192             if (valgrind --version) > /dev/null 2>&1; then
 193                 set valgrind -q --leak-check=full --time-stamp=yes \
 194                     --log-file="$logdir/$daemon.valgrind.log.%p" "$@"
 195             else
 196                 log_failure_msg "valgrind not installed, running $daemon without it"
 197             fi
 198             ;;
 199         strace)
 200             if (strace -V) > /dev/null 2>&1; then
 201                 strace="strace -tt -T -s 256 -ff"
 202                 if (strace -DV) > /dev/null 2>&1; then
 203                     # Has the -D option.
 204                     set $strace -D -o "$logdir/$daemon.strace.log" "$@"
 205                     strace=""
 206                 fi
 207             else
 208                 log_failure_msg "strace not installed, running $daemon without it"
 209             fi
 210             ;;
 211         glibc)
 212             set env MALLOC_CHECK_=2 MALLOC_PERTURB_=165 "$@"
 213             ;;
 214         '')
 215             ;;
 216         *)
 217             log_failure_msg "unknown wrapper $wrapper, running $daemon without it"
 218             ;;
 219     esac
 220
 221     # priority
 222     if test X"$priority" != X; then
 223         set nice -n "$priority" "$@"
 224     fi
 225
 226     action "Starting $daemon" "$@" || return 1
 227
 228     if test X"$strace" != X; then
 229         # Strace doesn't have the -D option so we attach after the fact.
 230         setsid $strace -o "$logdir/$daemon.strace.log" \
 231             -p `cat $rundir/$daemon.pid` > /dev/null 2>&1 &
 232     fi
 233 }
 234
 235 stop_daemon () {
 236     if test -e "$rundir/$1.pid"; then
 237         if pid=`cat "$rundir/$1.pid"`; then
 238             if pid_exists "$pid" >/dev/null 2>&1; then :; else
 239                 rm -f $rundir/$1.$pid.ctl $rundir/$1.$pid
 240                 return 0
 241             fi
 242
 243             graceful="EXIT .1 .25 .65 1"
 244             actions="TERM .1 .25 .65 1 1 1 1 \
 245                      KILL 1 1 1 2 10 15 30 \
 246                      FAIL"
 247             version=`ovs-appctl -T 1 -t $rundir/$1.$pid.ctl version \
 248                      | awk 'NR==1{print $NF}'`
 249
 250             # Use `ovs-appctl exit` only if the running daemon version
 251             # is >= 2.5.90.  This script might be used during upgrade to
 252             # stop older versions of daemons which do not behave correctly
 253             # with `ovs-appctl exit` (e.g. ovs-vswitchd <= 2.5.0 deletes
 254             # internal ports).
 255             if version_geq "$version" "2.5.90"; then
 256                 actions="$graceful $actions"
 257             fi
 258             for action in $actions; do
 259                 if pid_exists "$pid" >/dev/null 2>&1; then :; else
 260                     return 0
 261                 fi
 262                 case $action in
 263                     EXIT)
 264                         action "Exiting $1 ($pid)" \
 265                             ${bindir}/ovs-appctl -T 1 -t $rundir/$1.$pid.ctl exit $2
 266                         ;;
 267                     TERM)
 268                         action "Killing $1 ($pid)" kill $pid
 269                         ;;
 270                     KILL)
 271                         action "Killing $1 ($pid) with SIGKILL" kill -9 $pid
 272                         ;;
 273                     FAIL)
 274                         log_failure_msg "Killing $1 ($pid) failed"
 275                         return 1
 276                         ;;
 277                     *)
 278                         sleep $action
 279                         ;;
 280                 esac
 281             done
 282         fi
 283     fi
 284     log_success_msg "$1 is not running"
 285 }
 286
 287 daemon_status () {
 288     pidfile=$rundir/$1.pid
 289     if test -e "$pidfile"; then
 290         if pid=`cat "$pidfile"`; then
 291             if pid_exists "$pid"; then
 292                 echo "$1 is running with pid $pid"
 293                 return 0
 294             else
 295                 echo "Pidfile for $1 ($pidfile) is stale"
 296             fi
 297         else
 298             echo "Pidfile for $1 ($pidfile) exists but cannot be read"
 299         fi
 300     else
 301         echo "$1 is not running"
 302     fi
 303     return 1
 304 }
 305
 306 daemon_is_running () {
 307     pidfile=$rundir/$1.pid
 308     test -e "$pidfile" && pid=`cat "$pidfile"` && pid_exists "$pid" && pid_comm_check $1 $pid
 309 } >/dev/null 2>&1
 310
 311 # Prints commands needed to move the ip address from interface $1 to interface
 312 # $2
 313 move_ip_address () {
 314     if [ -z "$1" ] || [ -z "$2" ]; then
 315         return
 316     fi
 317     dev="$1"
 318     dst="$2"
 319
 320     # IP addresses (including IPv6).
 321     echo "ip addr flush dev $dev 2>/dev/null" # Suppresses "Nothing to flush".
 322     ip addr show dev $dev | while read addr; do
 323         set -- $addr
 324
 325         # Check and trim family.
 326         family=$1
 327         shift
 328         case $family in
 329             inet | inet6) ;;
 330             *) continue ;;
 331         esac
 332
 333         # Trim device off the end--"ip" insists on having "dev" precede it.
 334         addrcmd=
 335         while test $# != 0; do
 336             case $1 in
 337                 dynamic)
 338                     # XXX: According to 'man ip-address', "dynamic" is only
 339                     # used for ipv6 addresses.  But, atleast on RHEL 7.4
 340                     # (iproute-3.10.0-87), it is being used for ipv4
 341                     # addresses assigned with dhcp.
 342                     if [ "$family" = "inet" ]; then
 343                         shift
 344                         continue
 345                     fi
 346                     # Omit kernel-maintained route.
 347                     continue 2
 348                     ;;
 349                 scope)
 350                     if test "$2" = link -a "$family" != inet6; then
 351                         # Omit route derived from IP address, e.g.
 352                         # 172.16.0.0/16 derived from 172.16.12.34,
 353                         # but preserve IPv6 link-local address.
 354                         continue 2
 355                     fi
 356                     ;;
 357                 "$dev"|"$dev:"*)
 358                     # Address label string
 359                     label=`echo $1 | sed "s/$dev/$dst/"`
 360                     addrcmd="$addrcmd label $label"
 361                     shift
 362                     continue
 363                     ;;
 364             esac
 365             addrcmd="$addrcmd $1"
 366             shift
 367         done
 368         if test "$1" != "$dev"; then
 369             addrcmd="$addrcmd $1"
 370         fi
 371
 372         echo ip -f $family addr add $addrcmd dev $dst
 373     done
 374 }
 375
 376 # Prints commands needed to move the ip route of interface $1 to interface $2
 377 move_ip_routes () {
 378     if [ -z "$1" ] || [ -z "$2" ]; then
 379         return
 380     fi
 381     dev="$1"
 382     dst="$2"
 383     echo "ip route flush dev $dev proto boot 2>/dev/null" # Suppresses "Nothing to flush".
 384     ip route show dev $dev | while read route; do
 385         # "proto kernel" routes are installed by the kernel automatically.
 386         case $route in
 387             *" proto kernel "*) continue ;;
 388         esac
 389
 390         echo "ip route add $route dev $dst"
 391     done
 392 }
 393
 394 run_as_ovsuser() {
 395     if [ "$OVS_USER" != "" ]; then
 396         local uid=$(id -u "${OVS_USER%:*}")
 397         local gid=$(id -g "${OVS_USER%:*}")
 398         local groups=$(id -G "${OVS_USER%:*}" | tr ' ' ',')
 399         setpriv --reuid "$uid" --regid "$gid" --groups "$groups" "$@"
 400     else
 401         "$@"
 402     fi
 403 }
 404
 405 ovsdb_tool () {
 406     run_as_ovsuser ovsdb-tool -vconsole:off "$@"
 407 }
 408
 409 create_db () {
 410     DB_FILE="$1"
 411     DB_SCHEMA="$2"
 412     action "Creating empty database $DB_FILE" ovsdb_tool create "$DB_FILE" "$DB_SCHEMA"
 413 }
 414
 415 backup_db () {
 416     # Back up the old version.
 417     version=`ovsdb_tool db-version "$DB_FILE"`
 418     cksum=`ovsdb_tool db-cksum "$DB_FILE" | awk '{print $1}'`
 419     backup=$DB_FILE.backup$version-$cksum
 420     action "Backing up database to $backup" cp "$DB_FILE" "$backup" || return 1
 421 }
 422
 423 upgrade_db () {
 424     DB_FILE="$1"
 425     DB_SCHEMA="$2"
 426
 427     schemaver=`ovsdb_tool schema-version "$DB_SCHEMA"`
 428     if test ! -e "$DB_FILE"; then
 429         log_warning_msg "$DB_FILE does not exist"
 430         install_dir `dirname $DB_FILE`
 431         create_db "$DB_FILE" "$DB_SCHEMA"
 432     elif test X"`ovsdb_tool needs-conversion "$DB_FILE" "$DB_SCHEMA"`" = Xyes; then
 433         backup_db || return 1
 434
 435         # Compact database.  This is important if the old schema did not enable
 436         # garbage collection (i.e. if it did not have any tables with "isRoot":
 437         # true) but the new schema does.  In that situation the old database
 438         # may contain a transaction that creates a record followed by a
 439         # transaction that creates the first use of the record.  Replaying that
 440         # series of transactions against the new database schema (as "convert"
 441         # does) would cause the record to be dropped by the first transaction,
 442         # then the second transaction would cause a referential integrity
 443         # failure (for a strong reference).
 444         #
 445         # Errors might occur on an Open vSwitch downgrade if ovsdb-tool doesn't
 446         # understand some feature of the schema used in the OVSDB version that
 447         # we're downgrading from, so we don't give up on error.
 448         action "Compacting database" ovsdb_tool compact "$DB_FILE"
 449
 450         # Upgrade or downgrade schema.
 451         if action "Converting database schema" ovsdb_tool convert "$DB_FILE" "$DB_SCHEMA"; then
 452             :
 453         else
 454             log_warning_msg "Schema conversion failed, using empty database instead"
 455             rm -f "$DB_FILE"
 456             create_db "$DB_FILE" "$DB_SCHEMA"
 457         fi
 458     fi
 459 }
 460
 461 upgrade_cluster () {
 462     local DB_SCHEMA=$1 DB_SERVER=$2
 463     local schema_name=$(ovsdb-tool schema-name $1) || return 1
 464
 465     action "Waiting for $schema_name to come up" ovsdb-client -t 30 wait "$DB_SERVER" "$schema_name" connected || return $?
 466     local db_version=$(ovsdb-client -t 10 get-schema-version "$DB_SERVER" "$schema_name") || return $?
 467     local target_version=$(ovsdb-tool schema-version "$DB_SCHEMA") || return $?
 468
 469     if ovsdb-tool compare-versions "$db_version" == "$target_version"; then
 470         :
 471     elif ovsdb-tool compare-versions "$db_version" ">" "$target_version"; then
 472         log_warning_msg "Database $schema_name has newer schema version ($db_version) than our local schema ($target_version), possibly an upgrade is partially complete?"
 473     else
 474         action "Upgrading database $schema_name from schema version $db_version to $target_version" ovsdb-client -t 30 convert "$DB_SERVER" "$DB_SCHEMA"
 475     fi
 476 }
 477
 478 create_cluster () {
 479     DB_FILE="$1"
 480     DB_SCHEMA="$2"
 481     LOCAL_ADDR="$3"
 482
 483     if test ! -e "$DB_FILE"; then
 484         action "Creating cluster database $DB_FILE" ovsdb_tool create-cluster "$DB_FILE" "$DB_SCHEMA" "$LOCAL_ADDR"
 485     elif ovsdb_tool db-is-standalone "$DB_FILE"; then
 486         # Convert standalone database to clustered.
 487         backup_db || return 1
 488         action "Creating cluster database $DB_FILE from existing one" \
 489                ovsdb_tool create-cluster "$DB_FILE" "$backup" "$LOCAL_ADDR"
 490     fi
 491 }
 492
 493 join_cluster() {
 494     DB_FILE="$1"
 495     SCHEMA_NAME="$2"
 496     LOCAL_ADDR="$3"
 497     REMOTE_ADDR="$4"
 498
 499     if test ! -e "$DB_FILE"; then
 500         ovsdb_tool join-cluster "$DB_FILE" "$SCHEMA_NAME" "$LOCAL_ADDR" "$REMOTE_ADDR"
 501     elif ovsdb_tool db-is-standalone "$DB_FILE"; then
 502         # Backup standalone database and join cluster.
 503         backup_db || return 1
 504         action "Joining $DB_FILE to cluster" \
 505                ovsdb_tool join-cluster "$DB_FILE" "$SCHEMA_NAME" "$LOCAL_ADDR"
 506     fi
 507 }
 508
 509 ovs_vsctl () {
 510     ovs-vsctl --no-wait "$@"
 511 }
 512
 513 ## ----------------- ##
 514 ## force-reload-kmod ##
 515 ## ----------------- ##
 516
 517 ovs_kmod_ctl () {
 518     "$dir0/ovs-kmod-ctl" "$@"
 519 }
 520
 521 internal_interfaces () {
 522     # Outputs a list of internal interfaces:
 523     #
 524     #   - There is an internal interface for every bridge, whether it
 525     #     has an Interface record or not and whether the Interface
 526     #     record's 'type' is properly set or not.
 527     #
 528     #   - There is an internal interface for each Interface record whose
 529     #     'type' is 'internal'.
 530     #
 531     # But ignore interfaces that don't really exist.
 532     for d in `(ovs_vsctl --bare \
 533                 -- --columns=name find Interface type=internal \
 534                     -- list-br) | sort -u`
 535     do
 536         if test -e "/sys/class/net/$d"; then
 537                 printf "%s " "$d"
 538             fi
 539     done
 540 }
 541
 542 ovs_save () {
 543     bridges=`ovs_vsctl -- --real list-br`
 544     if [ -n "${bridges}" ] && \
 545         "$datadir/scripts/ovs-save" "$1" ${bridges} > "$2"; then
 546         chmod +x "$2"
 547         return 0
 548     fi
 549     [ -z "${bridges}" ] && return 0
 550 }
 551
 552 save_flows_if_required () {
 553     if test X"$DELETE_BRIDGES" != Xyes; then
 554         action "Saving flows" ovs_save save-flows "${script_flows}"
 555     fi
 556 }
 557
 558 save_interfaces () {
 559     "$datadir/scripts/ovs-save" save-interfaces ${ifaces} \
 560         > "${script_interfaces}"
 561 }
 562
 563 flow_restore_wait () {
 564     if test X"${OVS_VSWITCHD:-yes}" = Xyes; then
 565         ovs_vsctl set open_vswitch . other_config:flow-restore-wait="true"
 566     fi
 567 }
 568
 569 flow_restore_complete () {
 570     if test X"${OVS_VSWITCHD:-yes}" = Xyes; then
 571         ovs_vsctl --if-exists remove open_vswitch . other_config \
 572                   flow-restore-wait="true"
 573     fi
 574 }
 575
 576 restore_flows () {
 577     [ -x "${script_flows}" ] && \
 578         action "Restoring saved flows" "${script_flows}"
 579 }
 580
 581 restore_interfaces () {
 582     [ ! -x "${script_interfaces}" ] && return 0
 583     action "Restoring interface configuration" "${script_interfaces}"
 584     rc=$?
 585     if test $rc = 0; then
 586         level=debug
 587     else
 588         level=err
 589     fi
 590     log="logger -p daemon.$level -t ovs-save"
 591     $log "interface restore script exited with status $rc:"
 592     $log -f "$script_interfaces"
 593 }
 594
 595 init_restore_scripts () {
 596     script_interfaces=`mktemp`
 597     script_flows=`mktemp`
 598     trap 'rm -f "${script_interfaces}" "${script_flows}"' 0
 599 }
 600
 601 force_reload_kmod () {
 602
 603     if test X"${OVS_VSWITCHD:-yes}" != Xyes; then
 604         log_failure_msg "Reloading of kmod without ovs-vswitchd is an error"
 605         exit 1
 606     fi
 607
 608     ifaces=`internal_interfaces`
 609     action "Detected internal interfaces: $ifaces" true
 610
 611     init_restore_scripts
 612     save_flows_if_required
 613
 614     # Restart the database first, since a large database may take a
 615     # while to load, and we want to minimize forwarding disruption.
 616     stop_ovsdb
 617     start_ovsdb || return 1
 618
 619     stop_forwarding
 620
 621     if action "Saving interface configuration" save_interfaces; then
 622         :
 623     else
 624         log_warning_msg "Failed to save configuration, not replacing kernel module"
 625         start_forwarding
 626         add_managers
 627         exit 1
 628     fi
 629     chmod +x "$script_interfaces"
 630
 631     for dp in `ovs-dpctl dump-dps`; do
 632         action "Removing datapath: $dp" ovs-dpctl del-dp "$dp"
 633     done
 634
 635     if test -e /sys/module/ip_gre; then
 636         action "Forcing removal of ip_gre module" rmmod ip_gre
 637     fi
 638
 639     if test -e /sys/module/gre; then
 640         action "Forcing removal of gre module" rmmod gre
 641     fi
 642
 643     ovs_kmod_ctl remove
 644
 645     # Start vswitchd by asking it to wait till flow restore is finished.
 646     flow_restore_wait
 647     start_forwarding || return 1
 648
 649     # Restore saved flows and inform vswitchd that we are done.
 650     restore_flows
 651     flow_restore_complete
 652     add_managers
 653
 654     restore_interfaces
 655
 656     "$datadir/scripts/ovs-check-dead-ifs"
 657 }
 658
 659 ## ------- ##
 660 ## restart ##
 661 ## ------- ##
 662
 663 restart () {
 664     if daemon_is_running ovsdb-server && daemon_is_running ovs-vswitchd; then
 665         init_restore_scripts
 666         if test X"${OVS_VSWITCHD:-yes}" = Xyes; then
 667             save_flows_if_required
 668         fi
 669     fi
 670
 671     # Restart the database first, since a large database may take a
 672     # while to load, and we want to minimize forwarding disruption.
 673     stop_ovsdb
 674     start_ovsdb || return 1
 675
 676     stop_forwarding
 677
 678     # Start vswitchd by asking it to wait till flow restore is finished.
 679     flow_restore_wait
 680     start_forwarding || return 1
 681
 682     # Restore saved flows and inform vswitchd that we are done.
 683     restore_flows
 684     flow_restore_complete
 685     add_managers
 686 }