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 /usr/local/var/run/openvswitch/ovs-vswitchd.123.ctl.

              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

              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


       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 is:

       off    No message is ever logged at this level, so setting a
              logging destination's log level to off disables logging to
              that destination.

       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 warranted.

       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

              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. ovs-vswitchd.

              %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

              %r     The number of milliseconds elapsed from the start
                     of the application to the time the message was

              %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
       obtained from the project's upstream Git repository
       ⟨https://github.com/openvswitch/ovs.git⟩ on 2021-08-27.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-08-20.)  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 improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Open vSwitch                     2.11.90                   ovs-appctl(8)

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