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A system for controlling process state under UNIX

Project description

Supervisor is a client/server system that allows its users to control a number of processes on UNIX-like operating systems.

Supported Platforms

Supervisor has been tested and is known to run on Linux (Ubuntu), Mac OS X (10.4, 10.5, 10.6), and Solaris (10 for Intel) and FreeBSD 6.1. It will likely work fine on most UNIX systems.

Supervisor will not run at all under any version of Windows.

Supervisor is known to work with Python 2.4 or later but will not work under any version of Python 3.


You can view the current Supervisor documentation online in HTML format . This is where you should go for detailed installation and configuration documentation.

Mailing list, Reporting Bugs, and Viewing the Source Repository

You may subscribe to the Supervisor-users mailing list.

Please report bugs in the Github issue tracker. .

You can view the source repository for supervisor via


If you’d like to contribute to supervisor directly, please contact the Supervisor-users mailing list.

3.0b2 (2013-05-28)

  • The behavior of the program option user has changed. In all previous versions, if supervisord failed to switch to the user, a warning would be sent to the stderr log but the child process would still be spawned. This means that a mistake in the config file could result in a child process being unintentionally spawned as root. Now, supervisord will not spawn the child unless it was able to successfully switch to the user. Thanks to Igor Partola for reporting this issue.

  • If a user specified in the config file does not exist on the system, supervisord will now print an error and refuse to start.

  • Reverted a change to logging introduced in 3.0b1 that was intended to allow multiple processes to log to the same file with the rotating log handler. The implementation caused supervisord to crash during reload and to leak file handles. Also, since log rotation options are given on a per-program basis, impossible configurations could be created (conflicting rotation options for the same file). Given this and that supervisord now has syslog support, it was decided to remove this feature. A warning was added to the documentation that two processes may not log to the same file.

  • Fixed a bug where parsing command= could cause supervisord to crash if shlex.split() fails, such as a bad quoting. Patch by Scott Wilson.

  • It is now possible to use supervisorctl on a machine with no supervisord.conf file by supplying the connection information in command line options. Patch by Jens Rantil.

  • Fixed a bug where supervisord would crash if the syslog handler was used and supervisord received SIGUSR2 (log reopen request).

  • Fixed an XML-RPC bug where calling supervisor.getProcessInfo() with a bad name would cause a 500 Internal Server Error rather than the returning a BAD_NAME fault.

  • Added a favicon to the web interface. Patch by Caio Ariede.

  • Fixed a test failure due to incorrect handling of daylight savings time in the childutils tests. Patch by Ildar Hizbulin.

  • Fixed a number of pyflakes warnings for unused variables, imports, and dead code. Patch by Philippe Ombredanne.

3.0b1 (2012-09-10)

  • Fixed a bug where parsing environment= did not verify that key/value pairs were correctly separated. Patch by Martijn Pieters.

  • Fixed a bug in the HTTP server code that could cause unnecessary delays when sending large responses. Patch by Philip Zeyliger.

  • When supervisord starts up as root, if the -c flag was not provided, a warning is now emitted to the console. Rationale: supervisord looks in the current working directory for a supervisord.conf file; someone might trick the root user into starting supervisord while cd’ed into a directory that has a rogue supervisord.conf.

  • A warning was added to the documentation about the security implications of starting supervisord without the -c flag.

  • Add a boolean program option stopasgroup, defaulting to false. When true, the flag causes supervisor to send the stop signal to the whole process group. This is useful for programs, such as Flask in debug mode, that do not propagate stop signals to their children, leaving them orphaned.

  • Python 2.3 is no longer supported. The last version that supported Python 2.3 is Supervisor 3.0a12.

  • Removed the unused “supervisor_rpc” entry point from

  • Fixed a bug in the rotating log handler that would cause unexpected results when two processes were set to log to the same file. Patch by Whit Morriss.

  • Fixed a bug in config file reloading where each reload could leak memory because a list of warning messages would be appended but never cleared. Patch by Philip Zeyliger.

  • Added a new Syslog log handler. Thanks to Denis Bilenko, Nathan L. Smith, and Jason R. Coombs, who each contributed to the patch.

  • Put all change history into a single file (CHANGES.txt).

3.0a12 (2011-12-06)

  • Released to replace a broken 3.0a11 package where non-Python files were not included in the package.

3.0a11 (2011-12-06)

  • Added a new file, PLUGINS.rst, with a listing of third-party plugins for Supervisor. Contributed by Jens Rantil.

  • The pid command in supervisorctl can now be used to retrieve the PIDs of child processes. See help pid. Patch by Gregory Wisniewski.

  • Added a new host_node_name expansion that will be expanded to the value returned by Python’s platform.node (see Patch by Joseph Kondel.

  • Fixed a bug in the web interface where pages over 64K would be truncated. Thanks to Drew Perttula and Timothy Jones for reporting this.

  • Renamed README.txt to README.rst so GitHub renders the file as ReStructuredText.

  • The XML-RPC server is now compatible with clients that do not send empty <params> when there are no parameters for the method call. Thanks to Johannes Becker for reporting this.

  • Fixed supervisorctl --help output to show the correct program name.

  • The behavior of the configuration options minfds and minprocs has changed. Previously, if a hard limit was less than minfds or minprocs, supervisord would unconditionally abort with an error. Now, supervisord will attempt to raise the hard limit. This may succeed if supervisord is run as root, otherwise the error is printed as before. Patch by Benoit Sigoure.

  • Add a boolean program option killasgroup, defaulting to false, if true when resorting to send SIGKILL to stop/terminate the process send it to its whole process group instead to take care of possible children as well and not leave them behind. Patch by Samuele Pedroni.

  • Environment variables may now be used in the configuration file for options that support string expansion. Patch by Aleksey Sivokon.

  • Fixed a race condition where supervisord might not act on a signal sent to it. Thanks to Adar Dembo for reporting the issue and supplying the initial patch.

  • Updated the output of echo_supervisord_conf to fix typos and improve comments. Thanks to Jens Rantil for noticing these.

  • Fixed a possible 500 Server Error from the web interface. This was observed when using Supervisor on a domain socket behind Nginx, where Supervisor would raise an exception because REMOTE_ADDR was not set. Patch by David Bennett.

3.0a10 (2011-03-30)

  • Fixed the stylesheet of the web interface so the footer line won’t overlap a long process list. Thanks to Derek DeVries for the patch.

  • Allow rpc interface plugins to register new events types.

  • Bug fix for FCGI sockets not getting cleaned up when the reload command is issued from supervisorctl. Also, the default behavior has changed for FCGI sockets. They are now closed whenever the number of running processes in a group hits zero. Previously, the sockets were kept open unless a group-level stop command was issued.

  • Better error message when HTTP server cannot reverse-resolve a hostname to an IP address. Previous behavior: show a socket error. Current behavior: spit out a suggestion to stdout.

  • Environment variables set via environment= value within [supervisord] section had no effect. Thanks to Wyatt Baldwin for a patch.

  • Fix bug where stopping process would cause process output that happened after the stop request was issued to be lost. See

  • Moved 2.X change log entries into HISTORY.txt.

  • Converted CHANGES.txt and README.txt into proper ReStructuredText and included them in the long_description in

  • Added a tox.ini to the package (run via tox in the package dir). Tests supervisor on multiple Python versions.

3.0a9 (2010-08-13)

  • Use rich comparison methods rather than __cmp__ to sort process configs and process group configs to better straddle Python versions. (thanks to Jonathan Riboux for identifying the problem and supplying an initial patch).

  • Fixed test_supervisorctl.test_maintail_dashf test for Python 2.7. (thanks to Jonathan Riboux for identifying the problem and supplying an initial patch).

  • Fixed the way that supervisor.datatypes.url computes a “good” URL for compatibility with Python 2.7 and Python >= 2.6.5. URLs with bogus “schemes://” will now be accepted as a version-straddling compromise (before they were rejected before supervisor would start). (thanks to Jonathan Riboux for identifying the problem and supplying an initial patch).

  • Add a -v / --version option to supervisord: Print the supervisord version number out to stdout and exit. (Roger Hoover)

  • Import iterparse from xml.etree when available (eg: Python 2.6). Patch by Sidnei da Silva.

  • Fixed the url to the supervisor-users mailing list. Patch by Sidnei da Silva

  • When parsing “environment=” in the config file, changes introduced in 3.0a8 prevented Supervisor from parsing some characters commonly found in paths unless quoting was used as in this example:


    Supervisor once again allows the above line to be written as:


    Alphanumeric characters, “_”, “/”, “.”, “+”, “-”, “(”, “)”, and “:” can all be used as a value without quoting. If any other characters are needed in the value, please quote it as in the first example above. Thanks to Paul Heideman for reporting this issue.

  • Supervisor will now look for its config file in locations relative to the executable path, allowing it to be used more easily in virtual environments. If sys.argv[0] is /path/to/venv/bin/supervisorctl, supervisor will now look for it’s config file in /path/to/venv/etc/supervisord.conf and /path/to/venv/supervisord.conf in addition to the other standard locations. Patch by Chris Rossi.

3.0a8 (2010-01-20)

  • Don’t cleanup file descriptors on first supervisord invocation: this is a lame workaround for Snow Leopard systems that use libdispatch and are receiving “Illegal instruction” messages at supervisord startup time. Restarting supervisord via “supervisorctl restart” may still cause a crash on these systems.

  • Got rid of Medusa hashbang headers in various files to ease RPM packaging.

  • Allow umask to be 000 (patch contributed by Rowan Nairn).

  • Fixed a bug introduced in 3.0a7 where supervisorctl wouldn’t ask for a username/password combination properly from a password-protected supervisord if it wasn’t filled in within the “[supervisorctl]” section username/password values. It now properly asks for a username and password.

  • Fixed a bug introduced in 3.0a7 where would not detect the Python version correctly. Patch by Daniele Paolella.

  • Fixed a bug introduced in 3.0a7 where parsing a string of key/value pairs failed on Python 2.3 due to use of regular expression syntax introduced in Python 2.4.

  • Removed the test suite for the memmon console script, which was moved to the Superlance package in 3.0a7.

  • Added release dates to CHANGES.txt.

  • Reloading the config for an fcgi process group did not close the fcgi socket - now, the socket is closed whenever the group is stopped as a unit (including during config update). However, if you stop all the processes in a group individually, the socket will remain open to allow for graceful restarts of FCGI daemons. (Roger Hoover)

  • Rereading the config did not pick up changes to the socket parameter in a fcgi-program section. (Roger Hoover)

  • Made a more friendly exception message when a FCGI socket cannot be created. (Roger Hoover)

  • Fixed a bug where the –serverurl option of supervisorctl would not accept a URL with a “unix” scheme. (Jason Kirtland)

  • Running the tests now requires the “mock” package. This dependency has been added to “tests_require” in (Roger Hoover)

  • Added support for setting the ownership and permissions for an FCGI socket. This is done using new “socket_owner” and “socket_mode” options in an [fcgi-program:x] section. See the manual for details. (Roger Hoover)

  • Fixed a bug where the FCGI socket reference count was not getting decremented on spawn error. (Roger Hoover)

  • Fixed a Python 2.6 deprecation warning on use of the “sha” module.

  • Updated to one that knows about setuptools 0.6c11.

  • Running “supervisorctl shutdown” no longer dumps a Python backtrace when it can’t connect to supervisord on the expected socket. Thanks to Benjamin Smith for reporting this.

  • Removed use of collections.deque in our bundled version of asynchat because it broke compatibility with Python 2.3.

  • The sample configuration output by “echo_supervisord_conf” now correctly shows the default for “autorestart” as “unexpected”. Thanks to William Dode for noticing it showed the wrong value.

3.0a7 (2009-05-24)

  • We now bundle our own patched version of Medusa contributed by Jason Kirtland to allow Supervisor to run on Python 2.6. This was done because Python 2.6 introduced backwards incompatible changes to asyncore and asynchat in the stdlib.

  • The console script memmon, introduced in Supervisor 3.0a4, has been moved to Superlance ( The Superlance package contains other useful monitoring tools designed to run under Supervisor.

  • Supervisorctl now correctly interprets all of the error codes that can be returned when starting a process. Patch by Francesc Alted.

  • New stdout_events_enabled and stderr_events_enabled config options have been added to the [program:x], [fcgi-program:x], and [eventlistener:x] sections. These enable the emitting of new PROCESS_LOG events for a program. If unspecified, the default is False.

    If enabled for a subprocess, and data is received from the stdout or stderr of the subprocess while not in the special capture mode used by PROCESS_COMMUNICATION, an event will be emitted.

    Event listeners can subscribe to either PROCESS_LOG_STDOUT or PROCESS_LOG_STDERR individually, or PROCESS_LOG for both.

  • Values for subprocess environment variables specified with environment= in supervisord.conf can now be optionally quoted, allowing them to contain commas. Patch by Tim Godfrey.

  • Added a new event type, REMOTE_COMMUNICATION, that is emitted by a new RPC method, supervisor.sendRemoteCommEvent().

  • Patch for bug #268 (KeyError on here expansion for stdout/stderr_logfile) from David E. Kindred.

  • Add reread, update, and avail commands based on Anders Quist’s online_config_reload.diff patch. This patch extends the “add” and “drop” commands with automagical behavior:

    In supervisorctl:
      supervisor> status
      bar                              RUNNING    pid 14864, uptime 18:03:42
      baz                              RUNNING    pid 23260, uptime 0:10:16
      foo                              RUNNING    pid 14866, uptime 18:03:42
      gazonk                           RUNNING    pid 23261, uptime 0:10:16
      supervisor> avail
      bar                              in use    auto      999:999
      baz                              in use    auto      999:999
      foo                              in use    auto      999:999
      gazonk                           in use    auto      999:999
      quux                             avail     auto      999:999
    Now we add this to our conf:
    Then we reread conf:
      supervisor> reread
      baz: disappeared
      gazonk: disappeared
      quux: available
      zegroup: available
      supervisor> avail
      bar                              in use    auto      999:999
      foo                              in use    auto      999:999
      quux                             avail     auto      999:999
      zegroup:baz                      avail     auto      999:999
      zegroup:gazonk                   avail     auto      999:999
      supervisor> status
      bar                              RUNNING    pid 14864, uptime 18:04:18
      baz                              RUNNING    pid 23260, uptime 0:10:52
      foo                              RUNNING    pid 14866, uptime 18:04:18
      gazonk                           RUNNING    pid 23261, uptime 0:10:52
    The magic make-it-so command:
      supervisor> update
      baz: stopped
      baz: removed process group
      gazonk: stopped
      gazonk: removed process group
      zegroup: added process group
      quux: added process group
      supervisor> status
      bar                              RUNNING    pid 14864, uptime 18:04:43
      foo                              RUNNING    pid 14866, uptime 18:04:43
      quux                             RUNNING    pid 23561, uptime 0:00:02
      zegroup:baz                      RUNNING    pid 23559, uptime 0:00:02
      zegroup:gazonk                   RUNNING    pid 23560, uptime 0:00:02
      supervisor> avail
      bar                              in use    auto      999:999
      foo                              in use    auto      999:999
      quux                             in use    auto      999:999
      zegroup:baz                      in use    auto      999:999
      zegroup:gazonk                   in use    auto      999:999
  • Fix bug with symptom “KeyError: ‘process_name’” when using a logfile name including documented``process_name`` Python string expansions.

  • Tab completions in the supervisorctl shell, and a foreground mode for Supervisor, implemented as a part of GSoC. The supervisorctl program now has a fg command, which makes it possible to supply inputs to a process, and see its output/error stream in real time.

  • Process config reloading implemented by Anders Quist. The supervisorctl program now has the commands “add” and “drop”. “add <programname>” adds the process group implied by <programname> in the config file. “drop <programname>” removes the process group from the running configuration (it must already be stopped). This makes it possible to add processes to and remove processes from a running supervisord without restarting the supervisord process.

  • Fixed a bug where opening the HTTP servers would fail silently for socket errors other than errno.EADDRINUSE.

  • Thanks to Dave Peticolas, using “reload” against a supervisord that is running in the background no longer causes supervisord to crash.

  • Configuration options for logfiles now accept mixed case reserved words (e.g. “AUTO” or “auto”) for consistency with other options.

  • childutils.eventdata was buggy, it could not deal with carriage returns in data. See Thanks to Ian Bicking.

  • Per-process exitcodes= configuration now will not accept exit codes that are not 8-bit unsigned integers (supervisord will not start when one of the exit codes is outside the range of 0 - 255).

  • Per-process directory value can now contain expandable values like %(here)s. (See

  • Accepted patch from Roger Hoover to allow for a new sort of process group: “fcgi-program”. Adding one of these to your supervisord.conf allows you to control fastcgi programs. FastCGI programs cannot belong to heterogenous groups.

    The configuration for FastCGI programs is the same as regular programs except an additional “socket” parameter. Substitution happens on the socket parameter with the here and program_name variables:

  • Supervisorctl now supports a plugin model for supervisorctl commands.

  • Added the ability to retrieve supervisord’s own pid through supervisor.getPID() on the XML-RPC interface or a new “pid” command on supervisorctl.

3.0a6 (2008-04-07)

  • The RotatingFileLogger had a race condition in its doRollover method whereby a file might not actually exist despite a call to os.path.exists on the line above a place where we try to remove it. We catch the exception now and ignore the missing file.

3.0a5 (2008-03-13)

  • Supervisorctl now supports persistent readline history. To enable, add “history_file = <pathname>” to the [supervisorctl] section in your supervisord.conf file.

  • Multiple commands may now be issued on one supervisorctl command line, e.g. “restart prog; tail -f prog”. Separate commands with a single semicolon; they will be executed in order as you would expect.

3.0a4 (2008-01-30)

  • 3.0a3 broke Python 2.3 backwards compatibility.

  • On Debian Sarge, one user reported that a call to options.mktempfile would fail with an “[Errno 9] Bad file descriptor” at supervisord startup time. I was unable to reproduce this, but we found a workaround that seemed to work for him and it’s included in this release. See for more information. Thanks to William Dode.

  • The fault ALREADY_TERMINATED has been removed. It was only raised by supervisor.sendProcessStdin(). That method now returns NOT_RUNNING for parity with the other methods. (Mike Naberezny)

  • The fault TIMED_OUT has been removed. It was not used.

  • Supervisor now depends on meld3 0.6.4, which does not compile its C extensions by default, so there is no more need to faff around with NO_MELD3_EXTENSION_MODULES during installation if you don’t have a C compiler or the Python development libraries on your system.

  • Instead of making a user root around for the sample.conf file, provide a convenience command “echo_supervisord_conf”, which he can use to echo the sample.conf to his terminal (and redirect to a file appropriately). This is a new user convenience (especially one who has no Python experience).

  • Added numprocs_start config option to [program:x] and [eventlistener:x] sections. This is an offset used to compute the first integer that numprocs will begin to start from. Contributed by Antonio Beamud Montero.

  • Added capability for [include] config section to config format. This section must contain a single key “files”, which must name a space-separated list of file globs that will be included in supervisor’s configuration. Contributed by Ian Bicking.

  • Invoking the reload supervisorctl command could trigger a bug in supervisord which caused it to crash. See . Thanks to William Dode for a bug report.

  • The pidproxy script was made into a console script.

  • The password value in both the [inet_http_server] and [unix_http_server] sections can now optionally be specified as a SHA hexdigest instead of as cleartext. Values prefixed with {SHA} will be considered SHA hex digests. To encrypt a password to a form suitable for pasting into the configuration file using Python, do, e.g.:

    >>> import sha
    >>> '{SHA}' +'thepassword').hexdigest()
  • The subtypes of the events PROCESS_STATE_CHANGE (and PROCESS_STATE_CHANGE itself) have been removed, replaced with a simpler set of PROCESS_STATE subscribable event types.

    The new event types are:













    The PROCESS_STATE_CHANGE_EXITED_OR_STOPPED abstract event is gone.

    All process state changes have at least “processname”, “groupname”, and “from_state” (the name of the previous state) in their serializations.

    PROCESS_STATE_EXITED additionaly has “expected” (1 or 0) and “pid” (the process id) in its serialization.

    PROCESS_STATE_RUNNING, PROCESS_STATE_STOPPING, PROCESS_STATE_STOPPED additionally have “pid” in their serializations.

    PROCESS_STATE_STARTING and PROCESS_STATE_BACKOFF have “tries” in their serialization (initially “0”, bumped +1 each time a start retry happens).

  • Remove documentation from README.txt, point people to .

  • The eventlistener request/response protocol has changed. OK/FAIL must now be wrapped in a RESULT envelope so we can use it for more specialized communications.

    Previously, to signify success, an event listener would write the string OK\n to its stdout. To signify that the event was seen but couldn’t be handled by the listener and should be rebuffered, an event listener would write the string FAIL\n to its stdout.

    In the new protocol, the listener must write the string:

    RESULT {resultlen}\n{result}

    For example, to signify OK:

    RESULT 2\nOK

    To signify FAIL:


    See the scripts/ script for an example.

  • To provide a hook point for custom results returned from event handlers (see above) the [eventlistener:x] configuration sections now accept a “result_handler=” parameter, e.g. “result_handler=supervisor.dispatchers:default_handler” (the default) or “handler=mypackage:myhandler”. The keys are pkgutil “entry point” specifications (importable Python function names). Result handlers must be callables which accept two arguments: one named “event” which represents the event, and the other named “result”, which represents the listener’s result. A result handler either executes successfully or raises an exception. If it raises a supervisor.dispatchers.RejectEvent exception, the event will be rebuffered, and the eventhandler will be placed back into the ACKNOWLEDGED state. If it raises any other exception, the event handler will be placed in the UNKNOWN state. If it does not raise any exception, the event is considered successfully processed. A result handler’s return value is ignored. Writing a result handler is a “in case of emergency break glass” sort of thing, it is not something to be used for arbitrary business code. In particular, handlers must not block for any appreciable amount of time.

    The standard eventlistener result handler (supervisor.dispatchers:default_handler) does nothing if it receives an “OK” and will raise a supervisor.dispatchers.RejectEvent exception if it receives any other value.

  • Supervisord now emits TICK events, which happen every N seconds. Three types of TICK events are available: TICK_5 (every five seconds), TICK_60 (every minute), TICK_3600 (every hour). Event listeners may subscribe to one of these types of events to perform every-so-often processing. TICK events are subtypes of the EVENT type.

  • Get rid of OSX platform-specific memory monitor and replace with, which works on both Linux and Mac OS. This script is now a console script named “memmon”.

  • Allow “web handler” (the handler which receives http requests from browsers visiting the web UI of supervisor) to deal with POST requests.

  • RPC interface methods stopProcess(), stopProcessGroup(), and stopAllProcesses() now take an optional “wait” argument that defaults to True for parity with the start methods.

3.0a3 (2007-10-02)

  • Supervisorctl now reports a better error message when the main supervisor XML-RPC namespace is not registered. Thanks to Mike Orr for reporting this. (Mike Naberezny)

  • Create scripts directory within supervisor package, move there, and place sample event listener and comm event programs within the directory.

  • When an event notification is buffered (either because a listener rejected it or because all listeners were busy when we attempted to send it originally), we now rebuffer it in a way that will result in it being retried earlier than it used to be.

  • When a listener process exits (unexpectedly) before transitioning from the BUSY state, rebuffer the event that was being processed.

  • supervisorctl tail command now accepts a trailing specifier: stderr or stdout, which respectively, allow a user to tail the stderr or stdout of the named process. When this specifier is not provided, tail defaults to stdout.

  • supervisor clear command now clears both stderr and stdout logs for the given process.

  • When a process encounters a spawn error as a result of a failed execve or when it cannot setuid to a given uid, it now puts this info into the process’ stderr log rather than its stdout log.

  • The event listener protocol header now contains the server identifier, the pool that the event emanated from, and the poolserial as well as the values it previously contained (version, event name, serial, and length). The server identifier is taken from the config file options value identifier, the pool value is the name of the listener pool that this event emanates from, and the poolserial is a serial number assigned to the event local to the pool that is processing it.

  • The event listener protocol header is now a sequence of key-value pairs rather than a list of positional values. Previously, a representative header looked like:


    Now it looks like:

    ver:3.0 server:supervisor serial:21 ...
  • Specific event payload serializations have changed. All event types that deal with processes now include the pid of the process that the event is describing. In event serialization “header” values, we’ve removed the space between the header name and the value and headers are now separated by a space instead of a line feed. The names of keys in all event types have had underscores removed.

  • Abandon the use of the Python stdlib logging module for speed and cleanliness purposes. We’ve rolled our own.

  • Fix crash on start if AUTO logging is used with a max_bytes of zero for a process.

  • Improve process communication event performance.

  • The process config parameters stdout_capturefile and stderr_capturefile are no longer valid. They have been replaced with the stdout_capture_maxbytes and stderr_capture_maxbytes parameters, which are meant to be suffix-multiplied integers. They both default to zero. When they are zero, process communication event capturing is not performed. When either is nonzero, the value represents the maximum number of bytes that will be captured between process event start and end tags. This change was to support the fact that we no longer keep capture data in a separate file, we just use a FIFO in RAM to maintain capture info. For users whom don’t care about process communication events, or whom haven’t changed the defaults for stdout_capturefile or stderr_capturefile, they needn’t do anything to their configurations to deal with this change.

  • Log message levels have been normalized. In particular, process stdin/stdout is now logged at debug level rather than at trace level (trace level is now reserved for output useful typically for debugging supervisor itself). See “Supervisor Log Levels” in the documentation for more info.

  • When an event is rebuffered (because all listeners are busy or a listener rejected the event), the rebuffered event is now inserted in the head of the listener event queue. This doesn’t guarantee event emission in natural ordering, because if a listener rejects an event or dies while it’s processing an event, it can take an arbitrary amount of time for the event to be rebuffered, and other events may be processed in the meantime. But if pool listeners never reject an event or don’t die while processing an event, this guarantees that events will be emitted in the order that they were received because if all listeners are busy, the rebuffered event will be tried again “first” on the next go-around.

  • Removed EVENT_BUFFER_OVERFLOW event type.

  • The supervisorctl xmlrpc proxy can now communicate with supervisord using a persistent HTTP connection.

  • A new module “supervisor.childutils” was added. This module provides utilities for Python scripts which act as children of supervisord. Most notably, it contains an API method “getRPCInterface” allows you to obtain an xmlrpxlib ServerProxy that is willing to communicate with the parent supervisor. It also contains utility functions that allow for parsing of supervisor event listener protocol headers. A pair of scripts ( and were added to the script directory that serve as examples about how to use the childutils module.

  • A new envvar is added to child process environments: SUPERVISOR_SERVER_URL. This contains the server URL for the supervisord running the child.

  • An OK URL was added at /ok.html which just returns the string OK (can be used for up checks or speed checks via plain-old-HTTP).

  • An additional command-line option --profile_options is accepted by the supervisord script for developer use:

    supervisord -n -c sample.conf --profile_options=cumulative,calls

    The values are sort_stats options that can be passed to the standard Python profiler’s PStats sort_stats method.

    When you exit supervisor, it will print Python profiling output to stdout.

  • If cElementTree is installed in the Python used to invoke supervisor, an alternate (faster, by about 2X) XML parser will be used to parse XML-RPC request bodies. cElementTree was added as an “extras_require” option in

  • Added the ability to start, stop, and restart process groups to supervisorctl. To start a group, use start groupname:*. To start multiple groups, use start groupname1:* groupname2:*. Equivalent commands work for “stop” and “restart”. You can mix and match short processnames, fullly-specified group:process names, and groupsplats on the same line for any of these commands.

  • Added directory option to process config. If you set this option, supervisor will chdir to this directory before executing the child program (and thus it will be the child’s cwd).

  • Added umask option to process config. If you set this option, supervisor will set the umask of the child program. (Thanks to Ian Bicking for the suggestion).

  • A pair of scripts and` have been added to the scripts directory. If they are used together as described in their comments, processes which are consuming “too much” memory will be restarted. The eventgen script only works on OSX (my main development platform) but it should be trivially generalizable to other operating systems.

  • The long form --configuration (-c) command line option for supervisord was broken. Reported by Mike Orr. (Mike Naberezny)

  • New log level: BLAT (blather). We log all supervisor-internal-related debugging info here. Thanks to Mike Orr for the suggestion.

  • We now allow supervisor to listen on both a UNIX domain socket and an inet socket instead of making them mutually exclusive. As a result, the options “http_port”, “http_username”, “http_password”, “sockchmod” and “sockchown” are no longer part of the [supervisord] section configuration. These have been supplanted by two other sections: [unix_http_server] and [inet_http_server]. You’ll need to insert one or the other (depending on whether you want to listen on a UNIX domain socket or a TCP socket respectively) or both into your supervisord.conf file. These sections have their own options (where applicable) for port, username, password, chmod, and chown. See README.txt for more information about these sections.

  • All supervisord command-line options related to “http_port”, “http_username”, “http_password”, “sockchmod” and “sockchown” have been removed (see above point for rationale).

  • The option that used to be sockchown within the [supervisord] section (and is now named chown within the [unix_http_server] section) used to accept a dot-separated value. The separator now must be a colon “:”, e.g. “user:group”. Unices allow for dots in usernames, so this change is a bugfix. Thanks to Ian Bicking for the bug report.

  • If a ‘-c’ option is not specified on the command line, both supervisord and supervisorctl will search for one in the paths ./supervisord.conf , ./etc/supervisord.conf (relative to the current working dir when supervisord or supervisorctl is invoked) or in /etc/supervisord.conf (the old default path). These paths are searched in order, and supervisord and supervisorctl will use the first one found. If none are found, supervisor will fail to start.

  • The Python string expression %(here)s (referring to the directory in which the the configuration file was found) can be used within the following sections/options within the config file:

  • The --environment aka -b option was removed from the list of available command-line switches to supervisord (use “A=1 B=2 bin/supervisord” instead).

  • If the socket filename (the tail-end of the unix:// URL) was longer than 64 characters, supervisorctl would fail with an encoding error at startup.

  • The identifier command-line argument was not functional.

  • Fixed (bad error message in supervisorctl when program command not found on PATH).

  • Some child processes may not have been shut down properly at supervisor shutdown time.

  • Move to ZPL-derived (but not ZPL) license availble from; it’s slightly less restrictive than the ZPL (no servicemark clause).

  • Spurious errors related to unclosed files (“bad file descriptor”, typically) were evident at supervisord “reload” time (when using the “reload” command from supervisorctl).

  • We no longer bundle ez_setup to bootstrap setuptools installation.

3.0a2 (2007-08-24)

  • Fixed the README.txt example for defining the supervisor RPC interface in the configuration file. Thanks to Drew Perttula.

  • Fixed a bug where process communication events would not have the proper payload if the payload data was very short.

  • when supervisord attempted to kill a process with SIGKILL after the process was not killed within “stopwaitsecs” using a “normal” kill signal, supervisord would crash with an improper AssertionError. Thanks to Calvin Hendryx-Parker.

  • On Linux, Supervisor would consume too much CPU in an effective “busywait” between the time a subprocess exited and the time at which supervisor was notified of its exit status. Thanks to Drew Perttula.

  • RPC interface behavior change: if the RPC method “sendProcessStdin” is called against a process that has closed its stdin file descriptor (e.g. it has done the equivalent of “sys.stdin.close(); os.close(0)”), we return a NO_FILE fault instead of accepting the data.

  • Changed the semantics of the process configuration autorestart parameter with respect to processes which move between the RUNNING and EXITED state. autorestart was previously a boolean. Now it’s a trinary, accepting one of false, unexpected, or true. If it’s false, a process will never be automatically restarted from the EXITED state. If it’s unexpected, a process that enters the EXITED state will be automatically restarted if it exited with an exit code that was not named in the process config’s exitcodes list. If it’s true, a process that enters the EXITED state will be automatically restarted unconditionally. The default is now unexpected (it was previously true). The readdition of this feature is a reversion of the behavior change note in the changelog notes for 3.0a1 that asserted we never cared about the process’ exit status when determining whether to restart it or not.

  • develop (and presumably install) would fail under Python 2.3.3, because setuptools attempted to import splituser from urllib2, and it didn’t exist.

  • It’s now possible to use install and develop on systems which do not have a C compiler if you set the environment variable “NO_MELD3_EXTENSION_MODULES=1” in the shell in which you invoke these commands (versions of meld3 > 0.6.1 respect this envvar and do not try to compile optional C extensions when it’s set).

  • The test suite would fail on Python versions <= 2.3.3 because the “assertTrue” and “assertFalse” methods of unittest.TestCase didn’t exist in those versions.

  • The supervisorctl and supervisord wrapper scripts were disused in favor of using setuptools’ console_scripts entry point settings.

  • Documentation files and the sample configuration file are put into the generated supervisor egg’s doc directory.

  • Using the web interface would cause fairly dramatic memory leakage. We now require a version of meld3 that does not appear to leak memory from its C extensions (0.6.3).

3.0a1 (2007-08-16)

  • Default config file comment documented 10 secs as default for startsecs value in process config, in reality it was 1 sec. Thanks to Christoph Zwerschke.

  • Make note of subprocess environment behavior in README.txt. Thanks to Christoph Zwerschke.

  • New “strip_ansi” config file option attempts to strip ANSI escape sequences from logs for smaller/more readable logs (submitted by Mike Naberezny).

  • The XML-RPC method supervisor.getVersion() has been renamed for clarity to supervisor.getAPIVersion(). The old name is aliased for compatibility but is deprecated and will be removed in a future version (Mike Naberezny).

  • Improved web interface styling (Mike Naberezny, Derek DeVries)

  • The XML-RPC method supervisor.startProcess() now checks that the file exists and is executable (Mike Naberezny).

  • Two environment variables, “SUPERVISOR_PROCESS_NAME” and “SUPERVISOR_PROCESS_GROUP” are set in the environment of child processes, representing the name of the process and group in supervisor’s configuration.

  • Process state map change: a process may now move directly from the STARTING state to the STOPPING state (as a result of a stop request).

  • Behavior change: if autorestart is true, even if a process exits with an “expected” exit code, it will still be restarted. In the immediately prior release of supervisor, this was true anyway, and no one complained, so we’re going to consider that the “officially correct” behavior from now on.

  • Supervisor now logs subprocess stdout and stderr independently. The old program config keys “logfile”, “logfile_backups” and “logfile_maxbytes” are superseded by “stdout_logfile”, “stdout_logfile_backups”, and “stdout_logfile_maxbytes”. Added keys include “stderr_logfile”, “stderr_logfile_backups”, and “stderr_logfile_maxbytes”. An additional “redirect_stderr” key is used to cause program stderr output to be sent to its stdin channel. The keys “log_stderr” and “log_stdout” have been removed.

  • [program:x] config file sections now represent “homgeneous process groups” instead of single processes. A “numprocs” key in the section represents the number of processes that are in the group. A “process_name” key in the section allows composition of the each process’ name within the homogeneous group.

  • A new kind of config file section, [group:x] now exists, allowing users to group heterogeneous processes together into a process group that can be controlled as a unit from a client.

  • Supervisord now emits “events” at certain points in its normal operation. These events include supervisor state change events, process state change events, and “process communication events”.

  • A new kind of config file section [eventlistener:x] now exists. Each section represents an “event listener pool”, which is a special kind of homogeneous process group. Each process in the pool is meant to receive supervisor “events” via its stdin and perform some notification (e.g. send a mail, log, make an http request, etc.)

  • Supervisord can now capture data between special tokens in subprocess stdout/stderr output and emit a “process communications event” as a result.

  • Supervisor’s XML-RPC interface may be extended arbitrarily by programmers. Additional top-level namespace XML-RPC interfaces can be added using the [rpcinterface:foo] declaration in the configuration file.

  • New supervisor-namespace XML-RPC methods have been added: getAPIVersion (returns the XML-RPC API version, the older “getVersion” is now deprecated), “startProcessGroup” (starts all processes in a supervisor process group), “stopProcessGroup” (stops all processes in a supervisor process group), and “sendProcessStdin” (sends data to a process’ stdin file descriptor).

  • supervisor-namespace XML-RPC methods which previously accepted ony a process name as “name” (startProcess, stopProcess, getProcessInfo, readProcessLog, tailProcessLog, and clearProcessLog) now accept a “name” which may contain both the process name and the process group name in the form groupname:procname. For backwards compatibility purposes, “simple” names will also be accepted but will be expanded internally (e.g. if “foo” is sent as a name, it will be expanded to “foo:foo”, representing the foo process within the foo process group).

  • 2.X versions of supervisorctl will work against supervisor 3.0 servers in a degraded fashion, but 3.X versions of supervisorctl will not work at all against supervisor 2.X servers.

2.2b1 (2007-03-31)

  • Individual program configuration sections can now specify an environment.

  • Added a ‘version’ command to supervisorctl. This returns the version of the supervisor2 package which the remote supervisord process is using.

2.1 (2007-03-17)

  • When supervisord was invoked more than once, and its configuration was set up to use a UNIX domain socket as the HTTP server, the socket file would be erased in error. The symptom of this was that a subsequent invocation of supervisorctl could not find the socket file, so the process could not be controlled (it and all of its subprocesses would need to be killed by hand).

  • Close subprocess file descriptors properly when a subprocess exits or otherwise dies. This should result in fewer “too many open files to spawn foo” messages when supervisor is left up for long periods of time.

  • When a process was not killable with a “normal” signal at shutdown time, too many “INFO: waiting for x to die” messages would be sent to the log until we ended up killing the process with a SIGKILL. Now a maximum of one every three seconds is sent up until SIGKILL time. Thanks to Ian Bicking.

  • Add an assertion: we never want to try to marshal None to XML-RPC callers. Issue 223 in the collector from vgatto indicates that somehow a supervisor XML-RPC method is returning None (which should never happen), but I cannot identify how. Maybe the assertion will give us more clues if it happens again.

  • Supervisor would crash when run under Python 2.5 because the xmlrpclib.Transport class in Python 2.5 changed in a backward-incompatible way. Thanks to Eric Westra for the bug report and a fix.

  • Tests now pass under Python 2.5.

  • Better supervisorctl reporting on stop requests that have a FAILED status.

  • Removed duplicated code (readLog/readMainLog), thanks to Mike Naberezny.

  • Added tailProcessLog command to the XML-RPC API. It provides a more efficient way to tail logs than readProcessLog(). Use readProcessLog() to read chunks and tailProcessLog() to tail. (thanks to Mike Naberezny).

2.1b1 (2006-08-30)

  • “supervisord -h” and “supervisorctl -h” did not work (traceback instead of showing help view (thanks to Damjan from Macedonia for the bug report).

  • Processes which started successfully after failing to start initially are no longer reported in BACKOFF state once they are started successfully (thanks to Damjan from Macdonia for the bug report).

  • Add new ‘maintail’ command to supervisorctl shell, which allows you to tail the ‘main’ supervisor log. This uses a new readMainLog xmlrpc API.

  • Various process-state-transition related changes, all internal. README.txt updated with new state transition map.

  • startProcess and startAllProcesses xmlrpc APIs changed: instead of accepting a timeout integer, these accept a wait boolean (timeout is implied by process’ “startsecs” configuration). If wait is False, do not wait for startsecs.

Known issues:

  • Code does not match state transition map. Processes which are configured as autorestarting which start “successfully” but subsequently die after ‘startsecs’ go through the transitions RUNNING -> BACKOFF -> STARTING instead of the correct transitions RUNNING -> EXITED -> STARTING. This has no real negative effect, but should be fixed for correctness.

2.0 (2006-08-30)

  • pidfile written in daemon mode had incorrect pid.

  • supervisorctl: tail (non -f) did not pass through proper error messages when supplied by the server.

  • Log signal name used to kill processes at debug level.

  • supervisorctl “tail -f” didn’t work with supervisorctl sections configured with an absolute unix:// URL

  • New “environment” config file option allows you to add environment variable values to supervisord environment from config file.

2.0b1 (2006-07-12)

  • Fundamental rewrite based on 1.0.7, use distutils (only) for installation, use ConfigParser rather than ZConfig, use HTTP for wire protocol, web interface, less lies in supervisorctl.

1.0.7 (2006-07-11)

  • Don’t log a waitpid error if the error value is “no children”.

  • Use select() against child file descriptor pipes and bump up select timeout appropriately.

1.0.6 (2005-11-20)

  • Various tweaks to make run more effectively on Mac OS X (including fixing tests to run there, no more “error reading from fd XXX” in logtail output, reduced disk/CPU usage as a result of not writing to log file unnecessarily on Mac OS).

1.0.5 (2004-07-29)

  • Short description: In previous releases, managed programs that created voluminous stdout/stderr output could run more slowly than usual when invoked under supervisor, now they do not.

    Long description: The supervisord manages child output by polling pipes related to child process stderr/stdout. Polling operations are performed in the mainloop, which also performs a ‘select’ on the filedescriptor(s) related to client/server operations. In prior releases, the select timeout was set to 2 seconds. This release changes the timeout to 1/10th of a second in order to keep up with client stdout/stderr output.

    Gory description: On Linux, at least, there is a pipe buffer size fixed by the kernel of somewhere between 512 - 4096 bytes; when a child process writes enough data to fill the pipe buffer, it will block on further stdout/stderr output until supervisord comes along and clears out the buffer by reading bytes from the pipe within the mainloop. We now clear these buffers much more quickly than we did before due to the increased frequency of buffer reads in the mainloop; the timeout value of 1/10th of a second seems to be fast enough to clear out the buffers of child process pipes when managing programs on even a very fast system while still enabling the supervisord process to be in a sleeping state for most of the time.

1.0.4 or “Alpha 4” (2004-06-30)

  • Forgot to update version tag in, so the supervisor version in a3 is listed as “1.0.1”, where it should be “1.0.3”. a4 will be listed as “1.0.4’.

  • Instead of preventing a process from starting if setuid() can’t be called (if supervisord is run as nonroot, for example), just log the error and proceed.

1.0.3 or “Alpha 3” (2004-05-26)

  • The daemon could chew up a lot of CPU time trying to select() on real files (I didn’t know select() failed to block when a file is at EOF). Fixed by polling instead of using select().

  • Processes could “leak” and become zombies due to a bug in reaping dead children.

  • supervisord now defaults to daemonizing itself.

  • ‘daemon’ config file option and -d/–daemon command-line option removed from supervisord acceptable options. In place of these options, we now have a ‘nodaemon’ config file option and a -n/–nodaemon command-line option.

  • logtail now works.

  • pidproxy changed slightly to reap children synchronously.

  • in alpha2 changelist, supervisord was reported to have a “noauth” command-line option. This was not accurate. The way to turn off auth on the server is to disinclude the “passwdfile” config file option from the server config file. The client however does indeed still have a noauth option, which prevents it from ever attempting to send authentication credentials to servers.

  • ZPL license added for ZConfig to LICENSE.txt

1.0.2 or “Alpha 2” (Unreleased)

  • supervisorctl and supervisord no longer need to run on the same machine due to the addition of internet socket support.

  • supervisorctl and supervisord no longer share a common configuration file format.

  • supervisorctl now uses a persistent connection to supervisord (as opposed to creating a fresh connection for each command).

  • SRP (Secure Remote Password) authentication is now a supported form of access control for supervisord. In supervisorctl interactive mode, by default, users will be asked for credentials when attempting to talk to a supervisord that requires SRP authentication.

  • supervisord has a new command-line option and configuration file option for specifying “noauth” mode, which signifies that it should not require authentication from clients.

  • supervisorctl has a new command-line option and configuration option for specifying “noauth” mode, which signifies that it should never attempt to send authentication info to servers.

  • supervisorctl has new commands: open: opens a connection to a new supervisord; close: closes the current connection.

  • supervisorctl’s “logtail” command now retrieves log data from supervisord’s log file remotely (as opposed to reading it directly from a common filesystem). It also no longer emulates “tail -f”, it just returns <n> lines of the server’s log file.

  • The supervisord/supervisorctl wire protocol now has protocol versioning and is documented in “protocol.txt”.

  • “configfile” command-line override -C changed to -c

  • top-level section name for supervisor schema changed to ‘supervisord’ from ‘supervisor’

  • Added ‘pidproxy’ shim program.

Known issues in alpha 2:

  • If supervisorctl loses a connection to a supervisord or if the remote supervisord crashes or shuts down unexpectedly, it is possible that any supervisorctl talking to it will “hang” indefinitely waiting for data. Pressing Ctrl-C will allow you to restart supervisorctl.

  • Only one supervisorctl process may talk to a given supervisord process at a time. If two supervisorctl processes attempt to talk to the same supervisord process, one will “win” and the other will be disconnected.

  • Sometimes if a pidproxy is used to start a program, the pidproxy program itself will “leak”.

1.0.0 or “Alpha 1” (Unreleased)

Initial release.

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