1VIRT-ADMIN(1)               Virtualization Support               VIRT-ADMIN(1)
2
3
4

NAME

6       virt-admin - daemon administration interface
7

SYNOPSIS

9       virt-admin [OPTION]... [COMMAND_STRING]
10
11       virt-admin [OPTION]... COMMAND [ARG]...
12

DESCRIPTION

14       The virt-admin program is the main administration interface for modify‐
15       ing the libvirt daemon configuration at runtime, changing daemon behav‐
16       iour  as  well  as for monitoring and managing all clients connected to
17       the daemon.
18
19       The basic structure of most virt-admin usage is:
20
21          virt-admin [OPTION]... <command> [ARG]...
22
23       Where command is one of the commands listed below. Any command starting
24       with # is treated as a comment and silently ignored, all other unrecog‐
25       nized commands are diagnosed.
26
27       The virt-admin program can be used either to run one COMMAND by  giving
28       the  command  and  its  arguments  on the shell command line, or a COM‐
29       MAND_STRING which is a single shell  argument  consisting  of  multiple
30       COMMAND  actions  and  their arguments joined with whitespace and sepa‐
31       rated by semicolons or newlines between commands, where unquoted  back‐
32       slash-newline  pairs are elided.  Within COMMAND_STRING, virt-admin un‐
33       derstands the same single, double, and backslash escapes as the  shell,
34       although  you  must add another layer of shell escaping in creating the
35       single shell argument, and any word starting with unquoted #  begins  a
36       comment  that  ends  at newline.  If no command is given in the command
37       line, virt-admin will then start a minimal interpreter waiting for your
38       commands, and the quit command will then exit the program.
39
40       The virt-admin program understands the following OPTIONS.
41
42       -c, --connect URI
43
44       Connect  to the specified URI, as if by the connect command, instead of
45       the default connection. See NOTES.
46
47       -d, --debug LEVEL
48
49       Enable debug messages at integer LEVEL and above.  LEVEL can range from
50       0  to  4 (default).  See the documentation of VIRT_ADMIN_DEBUG environ‐
51       ment variable below for the description of each LEVEL.
52
53       -h, --help
54
55       Ignore all other arguments, and behave as  if  the  help  command  were
56       given instead.
57
58       -l, --log FILE
59
60       Output logging details to FILE.
61
62       -q, --quiet
63
64       Avoid extra informational messages.
65
66       -v, --version[=short]
67
68       Ignore  all  other arguments, and prints the version of the libvirt li‐
69       brary virt-admin is coming from
70
71       -V, --version=long
72
73       Ignore all other arguments, and prints the version of the  libvirt  li‐
74       brary virt-admin is coming from.
75

NOTES

77       The  virt-admin  supports  both  the monolithic libvirtd daemon and the
78       modular daemons whichever is in use by your system. The connection  URI
79       used  with  -c/--connect or the connect command is based on the name of
80       the controlled daemon e.g.: virtqemud:///system, libvirtd:///system.
81
82       Running virt-admin requires root privileges when communicating with the
83       system instance of a daemon (URI ending in /system) due to the communi‐
84       cations channels used to talk to the daemon.
85

GENERIC COMMANDS

87       The following commands are generic.
88
89   help
90       Syntax:
91
92          help [command-or-group]
93
94       This lists each of the virt-admin commands.  When used without options,
95       all commands are listed, one per line, grouped into related categories,
96       displaying the keyword for each group.
97
98       To display detailed information for a specific command, use its name as
99       the option.
100
101   quit, exit
102       Syntax:
103
104          quit
105          exit
106
107       quit this interactive terminal
108
109   version
110       Syntax:
111
112          version
113
114       will  print  out  the version info about which libvirt library was this
115       client built from. As opposed to virsh client, the output  already  in‐
116       cludes the version of the daemon.
117
118       Example:
119
120          $ virt-admin version
121          Compiled against library: libvirt 1.2.21
122          Using library: libvirt 1.2.21
123          Running against daemon: 1.2.20
124
125   cd
126       Syntax:
127
128          cd [directory]
129
130       Will  change current directory to directory.  The default directory for
131       the cd command is the home directory or, if there is no  HOME  variable
132       in the environment, the root directory.
133
134       This command is only available in interactive mode.
135
136   pwd
137       Syntax:
138
139          pwd
140
141       Will print the current directory.
142
143   connect
144       Syntax:
145
146          connect [URI]
147
148       (Re)-Connect  to  a  daemon's  administrating server. The URI parameter
149       specifies how to connect to the administrating server.  If  LIBVIRT_AD‐
150       MIN_DEFAULT_URI  or  uri_default (see below) were set, connect is auto‐
151       matically issued every time a command that requires an  active  connec‐
152       tion is executed. Note that this only applies if there is no connection
153       at all or there is an inactive one.
154
155       See NOTES on picking the correct URI corresponding to a libvirt daemon.
156
157       To find the currently used URI, check the uri command documented below.
158
159   uri
160       Syntax:
161
162          uri
163
164       Prints the administrating server canonical URI, can be useful in  shell
165       mode.  If no uri was specified, neither LIBVIRT_ADMIN_DEFAULT_URI envi‐
166       ronment variable nor uri_default option (libvirt-admin.conf) were  set,
167       libvirtd:///system is used.
168

DAEMON COMMANDS

170       The  following commands allow one to monitor the daemon's state as well
171       as directly change its internal configuration.
172
173   server-list
174       Syntax:
175
176          server-list
177
178       Lists all manageable servers contained within the daemon the client  is
179       currently connected to.
180
181   daemon-log-filters
182       Syntax:
183
184          daemon-log-filters [--filters string]
185
186       When  run  without arguments, this returns the currently defined set of
187       logging filters. Providing an argument will cause the command to define
188       a new set of logging filters.
189
190--filters
191
192       Define  a  new set of logging filters where multiple filters are delim‐
193       ited by space. Each filter must conform to the form described in detail
194       by /etc/libvirt/libvirtd.conf (section 'Logging filters').
195
196       Example:
197
198       To  define  a  filter  which suppresses all e.g. 'virObjectUnref' DEBUG
199       messages, use the following:
200
201          $ virt-admin daemon-log-filters "4:util.object"
202
203       (Note the '.' symbol which can be used  to  more  fine-grained  filters
204       tailored  to  specific modules, in contrast, to affect the whole direc‐
205       tory containing several modules this would become "4:util"):
206
207   daemon-log-outouts
208       Syntax:
209
210          daemon-log-outputs [--outputs string]
211
212       When run without arguments, this returns the currently defined  set  of
213       logging outputs. Providing an argument will cause the command to define
214       a new set of logging outputs.
215
216--outputs
217
218       Define a new set of logging outputs where multiple outputs  are  delim‐
219       ited by space. Each output must conform to the form described in detail
220       by /etc/libvirt/libvirtd.conf (section 'Logging outputs').
221
222       Example:
223
224       To replace the current setting for logging outputs with one that writes
225       to a file while logging errors only, the following could be used:
226
227          $ virt-admin daemon-log-outputs "4:file:<absolute_path_to_the_file>"
228
229       To define multiple outputs at once they need to be delimited by spaces:
230
231          $ virt-admin daemon-log-outputs "4:stderr 2:syslog:<msg_ident>"
232
233   daemon-timeout
234       Syntax:
235
236          daemon-timeout --timeout NUM
237
238       Sets  the  daemon  timeout  to  the  value of '--timeout' argument. Use
239       --timeout 0 to disable auto-shutdown of the daemon.
240

SERVER COMMANDS

242       The following commands manipulate daemon's server  internal  configura‐
243       tion.  The server is specified by its name.
244
245   server-threadpool-info
246       Syntax:
247
248          server-threadpool-info server
249
250       Retrieve server's threadpool attributes. These attributes include:
251
252minWorkers as the bottom limit to the number of active workers,
253
254maxWorkers as the top limit to the number of active workers,
255
256nWorkers as the current number of workers in the threadpool,
257
258freeWorkers as the current number of workers available for a task,
259
260prioWorkers  as the current number of priority workers in the thread‐
261         pool, and
262
263jobQueueDepth as the current depth of threadpool's job queue.
264
265       Background
266
267       Each daemon server utilizes a threadpool to accomplish tasks  requested
268       by  clients connected to it. Every time a client request arrives to the
269       server, it checks whether there is a worker available to accomplish the
270       given  task  or  it should create a new worker for the job (rather than
271       being destroyed, the worker becomes free once the  task  is  finished).
272       Creating new workers, however, is only possible when the current number
273       of workers is still below the configured upper limit.  In  addition  to
274       these  'standard'  workers, a threadpool also contains a special set of
275       workers called priority workers. Their  purpose  is  to  perform  tasks
276       that,  unlike tasks carried out by normal workers, are within libvirt's
277       full control and libvirt guarantees that such a task cannot hang,  thus
278       will  always finish. An example of such a task this would be destroying
279       a domain:
280
281          $ virsh destroy <domain>.
282
283   server-threadpool-set
284       Syntax:
285
286          server-threadpool-set server [--min-workers count] [--max-workers count] [--priority-workers count]
287
288       Change threadpool attributes on a server. Only a fraction  of  all  at‐
289       tributes  as  described  in server-threadpool-info is supported for the
290       setter.
291
292--min-workers
293
294         The bottom limit to number of active workers in a threadpool.
295
296--max-workers
297
298         The upper limit to number of active workers in a threadpool. If  used
299         in  combination  with  option  --min-workers, the value for the upper
300         limit has to be greater than the value for the bottom  limit,  other‐
301         wise the command results in an error.
302
303--priority-workers
304
305         The current number of active priority workers in a threadpool.
306
307   server-clients-info
308       Syntax:
309
310          server-clients-info server
311
312       Get  information  about the current setting of limits regarding connec‐
313       tions of new clients. This information comprises of the limits  to  the
314       maximum  number  of  clients  connected  to  server,  maximum number of
315       clients waiting for authentication, in order to  be  connected  to  the
316       server,  as  well as the current runtime values, more specifically, the
317       current number of clients connected to server and the current number of
318       clients waiting for authentication.
319
320       Example:
321
322          # virt-admin server-clients-info libvirtd
323          nclients_max        : 120
324          nclients            : 3
325          nclients_unauth_max : 20
326          nclients_unauth     : 0
327
328   server-clients-set
329       Syntax:
330
331          server-clients-set server [--max-clients count] [--max-unauth-clients count]
332
333       Set new client-related limits on server.
334
335--max-clients
336
337         Change  the upper limit of the maximum overall number of clients con‐
338         nected to server to value count. The value for this limit has  to  be
339         always greater than the value of --max-unauth-clients.
340
341--max-unauth-clients
342
343         Change  the  upper limit of the maximum number of clients waiting for
344         authentication, in order to be connected to server, to  value  count.
345         The  value  for  this  limit has to be always lower than the value of
346         --max-clients.
347
348   server-update-tls
349       Syntax:
350
351          server-update-tls server
352
353       Update tls context on server.
354
355server
356
357         Available servers on a daemon. Currently only supports 'libvirtd'  or
358         'virtproxyd'.
359

CLIENT COMMANDS

361       The  following  commands  provide  management and monitoring of clients
362       connected to one of daemon's available servers. Clients  are  specified
363       by  their numeric ID which is obtained by listing all clients connected
364       to a specified server (see command client-list).
365
366   client-list
367       Syntax:
368
369          client-list server
370
371       Print a table showing the list of clients connected to  <server>,  also
372       providing  information about transport type used on client's connection
373       (supported transports include unix, tcp, and tls), as well as providing
374       information about client's connection time (system local time is used).
375
376   client-info
377       Syntax:
378
379          client-info server client
380
381       Retrieve  identity information about client from server. The attributes
382       returned may vary depending on the connection transport  used.   Trans‐
383       port-dependent attributes include local client process's pid, uid, user
384       name, and group name, as well as socket address of the remote peer, see
385       Examples below.
386
387       On  the  other  hand, transport-independent attributes include client's
388       SELinux context (if enabled on the host) and SASL username (if SASL au‐
389       thentication is enabled within daemon).
390
391       Examples:
392
393          # virt-admin client-info libvirtd 1
394          id             : 1
395          connection_time: 2016-05-03 13:27:04+0200
396          transport      : unix
397          readonly       : yes
398          unix_user_id   : 0
399          unix_user_name : root
400          unix_group_id  : 0
401          unix_group_name: root
402          unix_process_id: 10201
403
404          # virt-admin client-info libvirtd 2
405          id             : 2
406          connection_time: 2016-05-03 13:30:33+0200
407          transport      : tcp
408          readonly       : no
409          sock_addr      : 127.0.0.1:57060
410
411   client-disconnect
412       Syntax:
413
414          client-disconnect server client
415
416       Close  a connection originating from client. The server argument speci‐
417       fies the name of the server client is currently connected to.
418

ENVIRONMENT

420       The following environment variables can be set to alter  the  behaviour
421       of virt-admin
422
423       • VIRT_ADMIN_DEBUG=<0 to 4>
424
425         Turn on verbose debugging of virt-admin commands. Valid levels are
426
427         • VIRT_ADMIN_DEBUG=0
428
429           DEBUG - Messages at ALL levels get logged
430
431         • VIRT_ADMIN_DEBUG=1
432
433           INFO - Logs messages at levels INFO, NOTICE, WARNING and ERROR
434
435         • VIRT_ADMIN_DEBUG=2
436
437           NOTICE - Logs messages at levels NOTICE, WARNING and ERROR
438
439         • VIRT_ADMIN_DEBUG=3
440
441           WARNING - Logs messages at levels WARNING and ERROR
442
443         • VIRT_ADMIN_DEBUG=4
444
445           ERROR - Messages at only ERROR level gets logged.
446
447       • VIRT_ADMIN_LOG_FILE=``LOGFILE``
448
449         The file to log virt-admin debug messages.
450
451       • LIBVIRT_ADMIN_DEFAULT_URI
452
453         The daemon whose admin server to connect to by default. Set this to a
454         URI, in the same format as accepted by the connect option. This over‐
455         rides the default URI set in any client config file.
456
457       • VIRT_ADMIN_HISTSIZE
458
459         The  number of commands to remember in the command  history.  The de‐
460         fault value is 500.
461
462       • LIBVIRT_DEBUG=LEVEL
463
464         Turn on verbose debugging of all libvirt API calls. Valid levels are
465
466         • LIBVIRT_DEBUG=1
467
468           Messages at level DEBUG or above
469
470         • LIBVIRT_DEBUG=2
471
472           Messages at level INFO or above
473
474         • LIBVIRT_DEBUG=3
475
476           Messages at level WARNING or above
477
478         • LIBVIRT_DEBUG=4
479
480           Messages at level ERROR or above
481
482       For   further   information    about    debugging    options    consult
483       https://libvirt.org/logging.html
484

AUTHORS

486       Please refer to the AUTHORS file distributed with libvirt.
487

BUGS

489       Please report all bugs you discover.  This should be done via either:
490
491       1. the mailing list
492
493          https://libvirt.org/contact.html
494
495       2. the bug tracker
496
497          https://libvirt.org/bugs.html
498
499       Alternatively,  you may report bugs to your software distributor / ven‐
500       dor.
501
503       Copyright (C) 2015 Red Hat, Inc., and the authors listed in the libvirt
504       AUTHORS file.
505

LICENSE

507       virt-admin is distributed under the terms of the GNU LGPL v2+.  This is
508       free software; see the source for copying conditions. There is NO  war‐
509       ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
510

SEE ALSO

512       virsh(1),          virt-xml-validate(1),         virt-host-validate(1),
513       https://libvirt.org/
514
515
516
517
518                                                                 VIRT-ADMIN(1)
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