Provided by: ovn-common_22.03.3-0ubuntu0.22.04.3_amd64 
NAME
ovn-appctl - utility for configuring running OVN daemons
SYNOPSIS
ovn-appctl [-target=target | -t target] [-T secs | -timeout=secs] command [arg...]
ovn-appctl -help
ovn-appctl -version
DESCRIPTION
OVN 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.
The ovn-appctl program provides a simple way to invoke these commands. The command to be
sent is specified on ovn-appctl’s command line as non-option arguments. ovn-appctl sends
the command and prints the daemon’s response on standard output.
ovn-ctl is exactly similar to Open vSwitch ovs-appctl utility.
COMMAND COMMANDS
Every OVN daemon supports a common set of commands, which are documented in this section.
General Commands
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 ovn-appctl utility itself.
list-commands
Lists the commands supported by the target.
version
Displays the version and compilation date of the target.
Logging Commands
OVN 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 available:
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 OVN daemon supports the following commands for examining and adjusting log levels.
vlog/list
Lists the known logging modules and their current levels.
vlog/list-pattern
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 ovn-
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 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.
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. ovn-
controller.
• %B : The RFC5424 syslog PRI of the message.
• %c : The name of the module (as shown by ovn-appctl -list) logging
the message.
• %d : The current date and time in ISO 8601 format (YYYY-MM-DD
HH:MM:SS).
• %d{format} : 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).
• %D{format} : 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.
• - : 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.
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.
vlog/close
Causes the daemon to close its log file, if it is open. (Use vlog/reopen to
reopen it later.)
vlog/reopen
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
-h
--help
Prints a brief help message to the console.
-V
--version
Prints version information to the console.