1ovn-appctl(8)                     OVN Manual                     ovn-appctl(8)
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NAME

6       ovn-appctl - utility for configuring running OVN daemons
7

SYNOPSIS

9        ovn-appctl [-target=target | -t target] [-T secs | -timeout=secs] com‐
10       mand [arg...]
11
12       ovn-appctl -help
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14       ovn-appctl -version
15

DESCRIPTION

17       OVN daemons accept certain commands at runtime to control their  behav‐
18       ior and query their settings. Every daemon accepts a common set of com‐
19       mands documented under COMMON COMMANDS below. Some daemons support  ad‐
20       ditional commands documented in their own manpages.
21
22       The  ovn-appctl program provides a simple way to invoke these commands.
23       The command to be sent is specified on  ovn-appctl’s  command  line  as
24       non-option  arguments. ovn-appctl sends the command and prints the dae‐
25       mon’s response on standard output.
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27       ovn-ctl is exactly similar to Open vSwitch ovs-appctl utility.
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COMMAND COMMANDS

30       Every OVN daemon supports a common set of  commands,  which  are  docu‐
31       mented in this section.
32
33   General Commands
34       These  commands  display  daemon-specific commands and the running ver‐
35       sion. Note that these commands are different from the -help  and  -ver‐
36       sion  options  that return information about the ovn-appctl utility it‐
37       self.
38
39              list-commands
40                     Lists the commands supported by the target.
41
42              version
43                     Displays the version and compilation date of the target.
44
45   Logging Commands
46       OVN has several log levels. The highest-severity log level is:
47
48              off    No message is ever logged at this  level,  so  setting  a
49                     logging  destination’s  log level to off disables logging
50                     to that destination.
51
52       The following log levels, in order of descending severity,  are  avail‐
53       able:
54
55              emer   A major failure forced a process to abort.
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57              err    A  high-level  operation or a subsystem failed. Attention
58                     is warranted.
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60              warn   A low-level operation failed, but higher-level subsystems
61                     may be able to recover.
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63              info   Information  that may be useful in retrospect when inves‐
64                     tigating a problem.
65
66              dbg    Information useful only to someone with intricate  knowl‐
67                     edge  of the system, or that would commonly cause too-vo‐
68                     luminous log output. Log messages at this level  are  not
69                     logged by default.
70
71       Every  OVN daemon supports the following commands for examining and ad‐
72       justing log levels.
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74              vlog/list
75                     Lists the known logging modules and their current levels.
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77              vlog/list-pattern
78                     Lists logging pattern used for each destination.
79
80              vlog/set [spec]
81                     Sets logging levels. Without any spec, sets the log level
82                     for  every module and destination to dbg. Otherwise, spec
83                     is a list of words  separated  by  spaces  or  commas  or
84                     colons, up to one from each category below:
85
86                     •      A valid module name, as displayed by the vlog/list
87                            command on ovn-appctl(8),  limits  the  log  level
88                            change to the specified module.
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90syslog,  console,  or file, to limit the log level
91                            change to only to the system log, to the  console,
92                            or to a file, respectively.
93
94                            On  Windows platform, syslog is accepted as a word
95                            and is only useful if the target was started  with
96                            the --syslog-target option (the word has no effect
97                            otherwise).
98
99off, emer, err, warn, info, or dbg, to control the
100                            log  level.  Messages  of  the  given  severity or
101                            higher will  be  logged,  and  messages  of  lower
102                            severity will be filtered out. off filters out all
103                            messages.
104
105                     Case is not significant within spec.
106
107              vlog/set PATTERN:destination: pattern
108                     Sets the log pattern for  destination  to  pattern.  Each
109                     time  a  message is logged to destination, pattern deter‐
110                     mines the message’s formatting. Most characters  in  pat‐
111                     tern are copied literally to the log, but special escapes
112                     beginning with % are expanded as follows:
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114%A : The name of the application logging the  mes‐
115                            sage, e.g. ovn-controller.
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117%B : The RFC5424 syslog PRI of the message.
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119%c  :  The name of the module (as shown by ovn-ap‐
120                            pctl -list) logging the message.
121
122%d : The current date and time in ISO 8601  format
123                            (YYYY-MM-DD HH:MM:SS).
124
125%d{format}  :  The  current  date  and time in the
126                            specified format, which takes the same  format  as
127                            the template argument to strftime(3). As an exten‐
128                            sion, any # characters in format will be  replaced
129                            by  fractional  seconds, e.g. use %H:%M:%S.### for
130                            the time to the  nearest  millisecond.  Sub-second
131                            times  are  only approximate and currently decimal
132                            places after the third will always be reported  as
133                            zero.
134
135%D  :  The  current  UTC date and time in ISO 8601
136                            format (YYYY-MM-DD HH:MM:SS).
137
138%D{format} : The current UTC date and time in  the
139                            specified  format,  which takes the same format as
140                            the template argument to strftime(3). Supports the
141                            same   extension   for  sub-second  resolution  as
142                            %d{...}.
143
144%E : The hostname of the node running the applica‐
145                            tion.
146
147%m : The message being logged.
148
149%N  : A serial number for this message within this
150                            run of the program, as a decimal number. The first
151                            message  a  program  logs has serial number 1, the
152                            second one has serial number 2, and so on.
153
154%n : A new-line.
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156%p : The level at which  the  message  is  logged,
157                            e.g. DBG.
158
159%P  : The program’s process ID (pid), as a decimal
160                            number.
161
162%r : The number of milliseconds elapsed  from  the
163                            start  of  the application to the time the message
164                            was logged.
165
166%t : The subprogram name, that is, an  identifying
167                            name  for  the  process or thread that emitted the
168                            log message, such as monitor for the process  used
169                            for  -monitor  or  main for the primary process or
170                            thread in a program.
171
172%T : The subprogram name enclosed in  parentheses,
173                            e.g.  (monitor),  or the empty string for the pri‐
174                            mary process or thread in a program.
175
176%% : A literal %.
177
178                     A few options may appear between the  %  and  the  format
179                     specifier character, in this order:
180
181- : Left justify the escape’s expansion within its
182                            field width. Right justification is the default.
183
184- : Pad the field to the field width with 0s. Pad‐
185                            ding with spaces is the default.
186
187                     width  A number specifies the minimum field width. If the
188                     escape expands to fewer characters than width then it  is
189                     padded to fill the field width. (A field wider than width
190                     is not truncated to fit.)
191
192                     The default  pattern  for  console  and  file  output  is
193                     %D{%Y-%m-%dT %H:%M:%SZ}|%05N|%c|%p|%m; for syslog output,
194                     %05N|%c|%p|%m.
195
196              vlog/set FACILITY:facility
197                     Sets the RFC5424 facility of the  log  message.  facility
198                     can  be  one  of  kern, user, mail, daemon, auth, syslog,
199                     lpr, news, uucp, clock, ftp, ntp, audit,  alert,  clock2,
200                     local0, local1, local2, local3, local4, local5, local6 or
201                     local7.
202
203              vlog/close
204                     Causes the daemon to close its log file, if it  is  open.
205                     (Use vlog/reopen to reopen it later.)
206
207              vlog/reopen
208                     Causes  the  daemon to close its log file, if it is open,
209                     and then reopen it. (This is useful  after  rotating  log
210                     files, to cause a new log file to be used.)
211
212                     This  has no effect if the target application was not in‐
213                     voked with the --log-file option.
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OPTIONS

216       -h
217       --help
218            Prints a brief help message to the console.
219
220       -V
221       --version
222            Prints version information to the console.
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226OVN 21.09.0                       ovn-appctl                     ovn-appctl(8)
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