ovs-appctl(8) — Linux manual page


ovs-appctl(8)                Open vSwitch Manual               ovs-appctl(8)

NAME         top

       ovs-appctl - utility for configuring running Open vSwitch daemons

SYNOPSIS         top

       ovs-appctl [--target=target | -t target] [-T secs | --timeout=secs]
       command [arg...]
       ovs-appctl --help
       ovs-appctl --version

DESCRIPTION         top

       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
       documented 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 daemon'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 /usr/local/var/run/openvswitch/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
              /usr/local/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 /usr/local/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
              contains a localhost TCP port on which an Open vSwitch daemon
              is listening for control channel connections. By default, each
              daemon writes the TCP port on which it is listening for
              control connection into the file program.ctl located inside
              the configured 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.

       -T secs
              By default, or with a secs of 0, ovs-appctl waits forever to
              connect to the daemon and receive a response.  This option
              limits runtime to approximately secs seconds.  If the timeout
              expires, ovs-appctl exits with a SIGALRM signal.


       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
       version.  Note that these commands are different from the --help and
       --version options that return information about the ovs-appctl
       utility itself.

              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

       The following log levels, in order of descending severity, are

       emer   A major failure forced a process to abort.

       err    A high-level operation or a subsystem failed.  Attention is

       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
              output.  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
                     command 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, respectively.

                     On Windows platform, syslog is accepted as a word and
                     is only useful if the target was started with the
                     --syslog-target option (the word has no effect

              •      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
              message's formatting.  Most characters in pattern are copied
              literally 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 HH:MM:SS).

                     The current date and time in the specified format,
                     which takes the same format as the template argument to
                     strftime(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
                     decimal places after the third will always be reported
                     as zero.

              %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
                     program 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.
                     (monitor), 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,

              Daemons written in Python (e.g. ovs-xapi-sync) 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 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.

OPTIONS         top

       --help Prints a brief help message to the console.

              Prints version information to the console.

SEE ALSO         top

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

COLOPHON         top

       This page is part of the Open vSwitch (a distributed virtual
       multilayer switch) project.  Information about the project can be
       found at ⟨http://openvswitch.org/⟩.  If you have a bug report for
       this manual page, send it to bugs@openvswitch.org.  This page was ob‐
       tained from the project's upstream Git repository
       ⟨https://github.com/openvswitch/ovs.git⟩ on 2020-11-01.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-10-27.)  If you discover any rendering problems in
       this HTML version of the page, or you believe there is a better or
       more up-to-date source for the page, or you have corrections or im‐
       provements to the information in this COLOPHON (which is not part of
       the original manual page), send a mail to man-pages@man7.org

Open vSwitch                       2.11.90                     ovs-appctl(8)

Pages that refer to this page: ovn-detrace(1)ovsdb-client(1)ovsdb-server(1)ovsdb-tool(1)ovs-tcpundump(1)ovn-controller(8)ovn-nbctl(8)ovn-northd(8)ovn-sbctl(8)ovn-trace(8)ovs-appctl(8)ovs-dpctl(8)ovs-ofctl(8)ovs-tcpdump(8)ovs-testcontroller(8)ovs-vsctl(8)ovs-vswitchd(8)vtep-ctl(8)