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          ovs-appctl(8)                 Open vSwitch Manual                ovs-appctl(8)
                 ovs-appctl - utility for configuring running Open vSwitch daemons
                 ovs-appctl [--target=target | -t target] command [arg...]
                 ovs-appctl --help
                 ovs-appctl --version
                 Open  vSwitch  daemons  accept  certain  commands at runtime to control
                 their behavior and query their settings.  Every daemon accepts a common
                 set  of  commands documented under COMMON COMMANDS below.  Some daemons
                 support  additional  commands  documented  in   their   own   manpages.
                 ovs-vswitchd in particular accepts a number of additional commands doc‐
                 umented in ovs-vswitchd(8).
                 The ovs-appctl program provides a simple way to invoke these  commands.
                 The  command  to  be  sent is specified on ovs-appctl's command line as
                 non-option arguments.  ovs-appctl sends the command and prints the dae‐
                 mon's response on standard output.
                 In normal use only a single option is accepted:
                 -t target
                        Tells ovs-appctl which daemon to contact.
                        If  target  begins  with  / it must name a Unix domain socket on
                        which an Open vSwitch daemon is listening  for  control  channel
                        connections.   By  default, each daemon listens on a Unix domain
                        socket named //var/run/openvswitch/program.pid.ctl,  where  pro
                        gram is the program's name and pid is its process ID.  For exam‐
                        ple,  if  ovs-vswitchd  has  PID  123,  it   would   listen   on
                        Otherwise, ovs-appctl looks for a pidfile, that is, a file whose
                        contents are the process ID of a running process  as  a  decimal
                        number,  named //var/run/openvswitch/target.pid.  (The --pidfile
                        option  makes  an  Open  vSwitch  daemon  create   a   pidfile.)
                        ovs-appctl reads the pidfile, then looks for a Unix socket named
                        //var/run/openvswitch/target.pid.ctl, where pid is  replaced  by
                        the  process  ID read from the pidfile, and uses that file as if
                        it had been specified directly as the target.
                        On Windows, target can be an absolute path to a file  that  con‐
                        tains  a  localhost  TCP port on which an Open vSwitch daemon is
                        listening for control channel connections. By default, each dae‐
                        mon  writes  the  TCP  port on which it is listening for control
                        connection into the file program.ctl located inside the  config‐
                        ured  OVS_RUNDIR  directory.  If target is not an absolute path,
                        ovs-appctl looks for a file named target.ctl in  the  configured
                        OVS_RUNDIR directory.
                        The default target is ovs-vswitchd.
                 Every  Open vSwitch daemon supports a common set of commands, which are
                 documented in this section.
                 These commands display daemon-specific commands and  the  running  ver‐
                 sion.   Note  that  these  commands  are  different from the --help and
                 --version options that return information about the ovs-appctl  utility
                        Lists the commands supported by the target.
                        Displays the version and compilation date of the target.
                 Open  vSwitch  has  several log levels.  The highest-severity log level
                 off    No message is ever logged at this level, so  setting  a  logging
                        destination's log level to off disables logging to that destina‐
                 The following log levels, in order of descending severity,  are  avail‐
                 emer   A major failure forced a process to abort.
                 err    A high-level operation or a subsystem failed.  Attention is war‐
                 warn   A low-level operation failed, but higher-level subsystems may be
                        able to recover.
                 info   Information  that may be useful in retrospect when investigating
                        a problem.
                 dbg    Information useful only to someone with intricate  knowledge  of
                        the system, or that would commonly cause too-voluminous log out‐
                        put.  Log messages at this level are not logged by default.
                 Every Open vSwitch daemon supports the following commands for examining
                 and adjusting log levels.
                        Lists the known logging modules and their current levels.
                        Lists logging pattern used for each destination.
                 vlog/set [spec]
                        Sets  logging  levels.  Without any spec, sets the log level for
                        every module and destination to dbg.  Otherwise, spec is a  list
                        of words separated by spaces or commas or colons, up to one from
                        each category below:
                        ·      A valid module name, as displayed by the  vlog/list  com‐
                               mand on ovs-appctl(8), limits the log level change to the
                               specified module.
                        ·      syslog, console, or file, to limit the log  level  change
                               to  only to the system log, to the console, or to a file,
                               On Windows platform, syslog is accepted as a word and  is
                               only  useful  if  the  target was started with the --sys
                               log-target option (the word has no effect otherwise).
                        ·      off, emer, err, warn, info, or dbg, to  control  the  log
                               level.   Messages of the given severity or higher will be
                               logged, and messages of lower severity will  be  filtered
                               out.  off filters out all messages.
                        Case is not significant within spec.
                        Regardless  of  the  log  levels set for file, logging to a file
                        will not take place unless the target  application  was  invoked
                        with the --log-file option.
                        For compatibility with older versions of OVS, any is accepted as
                        a word but has no effect.
                 vlog/set PATTERN:destination:pattern
                        Sets the log pattern for destination to pattern.   Each  time  a
                        message  is  logged  to destination, pattern determines the mes‐
                        sage's formatting.  Most characters in pattern are copied liter‐
                        ally  to  the  log,  but  special  escapes  beginning with % are
                        expanded as follows:
                        %A     The name of the application  logging  the  message,  e.g.
                        %B     The RFC5424 syslog PRI of the message.
                        %c     The  name  of  the module (as shown by ovs-appctl --list)
                               logging the message.
                        %d     The current date and time in ISO 8601 format  (YYYY-MM-DD
                               The  current date and time in the specified format, which
                               takes the same format as the template argument  to  strf
                               time(3).   As  an  extension,  any # characters in format
                               will  be  replaced  by  fractional  seconds,   e.g.   use
                               %H:%M:%S.###  for  the  time  to the nearest millisecond.
                               Sub-second times are only approximate and currently deci‐
                               mal  places  after  the  third will always be reported as
                        %D     The  current  UTC  date  and  time  in  ISO  8601  format
                               (YYYY-MM-DD HH:MM:SS).
                               The  current  UTC  date and time in the specified format,
                               which takes the same format as the template  argument  to
                               strftime(3).   Supports the same extension for sub-second
                               resolution as %d{...}.
                        %E     The hostname of the node running the application.
                        %m     The message being logged.
                        %N     A serial number for this message within this run  of  the
                               program,  as  a decimal number.  The first message a pro‐
                               gram logs has serial number 1, the second one has  serial
                               number 2, and so on.
                        %n     A new-line.
                        %p     The level at which the message is logged, e.g. DBG.
                        %P     The program's process ID (pid), as a decimal number.
                        %r     The  number of milliseconds elapsed from the start of the
                               application to the time the message was logged.
                        %t     The subprogram name, that is, an identifying name for the
                               process  or  thread that emitted the log message, such as
                               monitor for the process used for --monitor  or  main  for
                               the primary process or thread in a program.
                        %T     The  subprogram name enclosed in parentheses, e.g. (moni
                               tor), or the empty string  for  the  primary  process  or
                               thread in a program.
                        %%     A literal %.
                        A  few options may appear between the % and the format specifier
                        character, in this order:
                        -      Left justify the  escape's  expansion  within  its  field
                               width.  Right justification is the default.
                        0      Pad  the  field to the field width with 0s.  Padding with
                               spaces is the default.
                        width  A number specifies  the  minimum  field  width.   If  the
                               escape  expands to fewer characters than width then it is
                               padded to fill the field  width.   (A  field  wider  than
                               width is not truncated to fit.)
                        The  default pattern for console and file output is %D{%Y-%m-%dT
                        %H:%M:%SZ}|%05N|%c|%p|%m; for syslog output, %05N|%c|%p|%m.
                        Daemons  written  in  Python  (e.g.   ovs-xapi-sync,   ovs-moni
                        tor-ipsec) do not allow control over the log pattern.
                 vlog/set FACILITY:facility
                        Sets  the  RFC5424  facility of the log message. facility can be
                        one of kern, user, mail, daemon, auth, syslog, lpr, news,  uucp,
                        clock,  ftp,  ntp, audit, alert, clock2, local0, local1, local2,
                        local3, local4, local5, local6 or local7.
                        Causes the daemon to close and reopen its log  file.   (This  is
                        useful  after  rotating log files, to cause a new log file to be
                        This has no effect if the target  application  was  not  invoked
                        with the --log-file option.
                 --help Prints a brief help message to the console.
                        Prints version information to the console.
          SEE ALSO
                 ovs-appctl   can   control   all   Open   vSwitch  daemons,  including:
                 ovs-vswitchd(8), and ovsdb-server(8).
          Open vSwitch                         2.5.1                       ovs-appctl(8)