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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | COMMAND COMMANDS | OPTIONS | COLOPHON |
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ovn-appctl(8) OVN Manual ovn-appctl(8)
ovn-appctl - utility for configuring running OVN daemons
ovn-appctl [-target=target | -t target] [-T secs | -timeout=secs]
command [arg...]
ovn-appctl -help
ovn-appctl -version
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-appctl is the equivalent of the Open vSwitch ovs-appctl
utility.
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 hard stop.
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.
-h
--help
Prints a brief help message to the console.
-V
--version
Prints version information to the console.
This page is part of the Open Virtual Network (Daemons for Open
vSwitch that translate virtual network configurations into
OpenFlow) project. Information about the project can be found at
⟨https://www.ovn.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/ovn-org/ovn⟩ on 2025-08-11. (At that time,
the date of the most recent commit that was found in the
repository was 2025-08-08.) 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
man-pages@man7.org
OVN 25.03.90 ovn-appctl ovn-appctl(8)
Pages that refer to this page: ovn-nbctl(8), ovn-sbctl(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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