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 /home/joe/git/openvswitch/_run/run/program.pid.ctl,
              where  program  is the program's name and pid is its process ID.
              For example, 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   /home/joe/git/openvswitch/_run/run/target.pid.
              (The --pidfile option makes an Open vSwitch daemon create a pid‐
              file.)   ovs-appctl  reads  the  pidfile,  then looks for a Unix
              socket named  /home/joe/git/openvswitch/_run/run/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

              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) do not allow con‐
              trol 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 its log file, if it is open.  (Use
              vlog/reopen to reopen it later.)

              Causes the daemon to close its log file, if it is open, and then
              reopen it.  (This is useful after rotating log files, to cause a
              new log file to be used.)

              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.

       ovs-appctl   can   control   all   Open   vSwitch  daemons,  including:
       ovs-vswitchd(8), and ovsdb-server(8).

Open vSwitch                        2.7.90                       ovs-appctl(8)