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PROGRAM:
NAME
echo_supervisord_conf - Supervisor Configuration Documentation
Supervisor is a client/server system that allows its users to monitor and control a number
of processes on UNIX-like operating systems.
It shares some of the same goals of programs like launchd, daemontools, and runit. Unlike
some of these programs, it is not meant to be run as a substitute for init as "process id
1". Instead it is meant to be used to control processes related to a project or a
customer, and is meant to start like any other program at boot time.
DOCUMENTATION
Creating a Configuration File
Once the Supervisor installation has completed, run echo_supervisord_conf. This will
print a "sample" Supervisor configuration file to your terminal's stdout.
Once you see the file echoed to your terminal, reinvoke the command as
echo_supervisord_conf > /etc/supervisord.conf. This won't work if you do not have root
access.
If you don't have root access, or you'd rather not put the supervisord.conf file in
/etc/supervisord.conf`, you can place it in the current directory (echo_supervisord_conf >
supervisord.conf) and start supervisord with the -c flag in order to specify the
configuration file location.
For example, supervisord -c supervisord.conf. Using the -c flag actually is redundant in
this case, because supervisord searches the current directory for a supervisord.conf
before it searches any other locations for the file, but it will work.
Once you have a configuration file on your filesystem, you can begin modifying it to your
liking.
Configuration File
The Supervisor configuration file is conventionally named supervisord.conf. It is used by
both supervisord and supervisorctl. If either application is started without the -c
option (the option which is used to tell the application the configuration filename
explicitly), the application will look for a file named supervisord.conf within the
following locations, in the specified order. It will use the first file it finds.
1. $CWD/supervisord.conf
2. $CWD/etc/supervisord.conf
3. /etc/supervisord.conf
4. ../etc/supervisord.conf (Relative to the executable)
5. ../supervisord.conf (Relative to the executable)
NOTE:
Some distributions have packaged Supervisor with their own customizations. These
modified versions of Supervisor may load the configuration file from locations other
than those described here. Notably, Ubuntu packages have been found that use
/etc/supervisor/supervisord.conf.
File Format
supervisord.conf is a Windows-INI-style (Python ConfigParser) file. It has sections (each
denoted by a [header]) and key / value pairs within the sections. The sections and their
allowable values are described below.
Environment Variables
Environment variables that are present in the environment at the time that supervisord is
started can be used in the configuration file using the Python string expression syntax
%(ENV_X)s:
[program:example]
command=/usr/bin/example --loglevel=%(ENV_LOGLEVEL)s
In the example above, the expression %(ENV_LOGLEVEL)s would be expanded to the value of
the environment variable LOGLEVEL.
NOTE:
In Supervisor 3.2 and later, %(ENV_X)s expressions are supported in all options. In
prior versions, some options support them, but most do not. See the documentation for
each option below.
[unix_http_server] Section Settings
The supervisord.conf file contains a section named [unix_http_server] under which
configuration parameters for an HTTP server that listens on a UNIX domain socket should be
inserted. If the configuration file has no [unix_http_server] section, a UNIX domain
socket HTTP server will not be started. The allowable configuration values are as
follows.
[unix_http_server] Section Values
file
A path to a UNIX domain socket (e.g. /tmp/supervisord.sock) on which supervisor will
listen for HTTP/XML-RPC requests. supervisorctl uses XML-RPC to communicate with
supervisord over this port. This option can include the value %(here)s, which expands
to the directory in which the supervisord configuration file was found.
Default: None.
Required: No.
Introduced: 3.0
chmod
Change the UNIX permission mode bits of the UNIX domain socket to this value at
startup.
Default: 0700
Required: No.
Introduced: 3.0
chown
Change the user and group of the socket file to this value. May be a UNIX username
(e.g. chrism) or a UNIX username and group separated by a colon (e.g. chrism:wheel).
Default: Use the username and group of the user who starts supervisord.
Required: No.
Introduced: 3.0
username
The username required for authentication to this HTTP server.
Default: No username required.
Required: No.
Introduced: 3.0
password
The password required for authentication to this HTTP server. This can be a cleartext
password, or can be specified as a SHA-1 hash if prefixed by the string {SHA}. For
example, {SHA}82ab876d1387bfafe46cc1c8a2ef074eae50cb1d is the SHA-stored version of the
password "thepassword".
Note that hashed password must be in hex format.
Default: No password required.
Required: No.
Introduced: 3.0
[unix_http_server] Section Example
[unix_http_server]
file = /tmp/supervisor.sock
chmod = 0777
chown= nobody:nogroup
username = user
password = 123
[inet_http_server] Section Settings
The supervisord.conf file contains a section named [inet_http_server] under which
configuration parameters for an HTTP server that listens on a TCP (internet) socket should
be inserted. If the configuration file has no [inet_http_server] section, an inet HTTP
server will not be started. The allowable configuration values are as follows.
[inet_http_server] Section Values
port
A TCP host:port value or (e.g. 127.0.0.1:9001) on which supervisor will listen for
HTTP/XML-RPC requests. supervisorctl will use XML-RPC to communicate with supervisord
over this port. To listen on all interfaces in the machine, use :9001 or *:9001.
Default: No default.
Required: Yes.
Introduced: 3.0
username
The username required for authentication to this HTTP server.
Default: No username required.
Required: No.
Introduced: 3.0
password
The password required for authentication to this HTTP server. This can be a cleartext
password, or can be specified as a SHA-1 hash if prefixed by the string {SHA}. For
example, {SHA}82ab876d1387bfafe46cc1c8a2ef074eae50cb1d is the SHA-stored version of the
password "thepassword".
Note that hashed password must be in hex format.
Default: No password required.
Required: No.
Introduced: 3.0
[inet_http_server] Section Example
[inet_http_server]
port = 127.0.0.1:9001
username = user
password = 123
[supervisord] Section Settings
The supervisord.conf file contains a section named [supervisord] in which global settings
related to the supervisord process should be inserted. These are as follows.
[supervisord] Section Values
logfile
The path to the activity log of the supervisord process. This option can include the
value %(here)s, which expands to the directory in which the supervisord configuration
file was found.
Default: $CWD/supervisord.log
Required: No.
Introduced: 3.0
logfile_maxbytes
The maximum number of bytes that may be consumed by the activity log file before it is
rotated (suffix multipliers like "KB", "MB", and "GB" can be used in the value). Set
this value to 0 to indicate an unlimited log size.
Default: 50MB
Required: No.
Introduced: 3.0
logfile_backups
The number of backups to keep around resulting from activity log file rotation. If set
to 0, no backups will be kept.
Default: 10
Required: No.
Introduced: 3.0
loglevel
The logging level, dictating what is written to the supervisord activity log. One of
critical, error, warn, info, debug, trace, or blather. Note that at log level debug,
the supervisord log file will record the stderr/stdout output of its child processes
and extended info info about process state changes, which is useful for debugging a
process which isn't starting properly. See also: activity_log_levels.
Default: info
Required: No.
Introduced: 3.0
pidfile
The location in which supervisord keeps its pid file. This option can include the
value %(here)s, which expands to the directory in which the supervisord configuration
file was found.
Default: $CWD/supervisord.pid
Required: No.
Introduced: 3.0
umask
The umask of the supervisord process.
Default: 022
Required: No.
Introduced: 3.0
nodaemon
If true, supervisord will start in the foreground instead of daemonizing.
Default: false
Required: No.
Introduced: 3.0
minfds
The minimum number of file descriptors that must be available before supervisord will
start successfully. A call to setrlimit will be made to attempt to raise the soft and
hard limits of the supervisord process to satisfy minfds. The hard limit may only be
raised if supervisord is run as root. supervisord uses file descriptors liberally, and
will enter a failure mode when one cannot be obtained from the OS, so it's useful to be
able to specify a minimum value to ensure it doesn't run out of them during execution.
This option is particularly useful on Solaris, which has a low per-process fd limit by
default.
Default: 1024
Required: No.
Introduced: 3.0
minprocs
The minimum number of process descriptors that must be available before supervisord
will start successfully. A call to setrlimit will be made to attempt to raise the soft
and hard limits of the supervisord process to satisfy minprocs. The hard limit may
only be raised if supervisord is run as root. supervisord will enter a failure mode
when the OS runs out of process descriptors, so it's useful to ensure that enough
process descriptors are available upon supervisord startup.
Default: 200
Required: No.
Introduced: 3.0
nocleanup
Prevent supervisord from clearing any existing AUTO child log files at startup time.
Useful for debugging.
Default: false
Required: No.
Introduced: 3.0
childlogdir
The directory used for AUTO child log files. This option can include the value
%(here)s, which expands to the directory in which the supervisord configuration file
was found.
Default: value of Python's tempfile.get_tempdir()
Required: No.
Introduced: 3.0
user
Instruct supervisord to switch users to this UNIX user account before doing any
meaningful processing. The user can only be switched if supervisord is started as the
root user. If supervisord can't switch users, it will still continue but will write a
log message at the critical level saying that it can't drop privileges.
Default: do not switch users
Required: No.
Introduced: 3.0
directory
When supervisord daemonizes, switch to this directory. This option can include the
value %(here)s, which expands to the directory in which the supervisord configuration
file was found.
Default: do not cd
Required: No.
Introduced: 3.0
strip_ansi
Strip all ANSI escape sequences from child log files.
Default: false
Required: No.
Introduced: 3.0
environment
A list of key/value pairs in the form KEY="val",KEY2="val2" that will be placed in the
supervisord process' environment (and as a result in all of its child process'
environments). This option can include the value %(here)s, which expands to the
directory in which the supervisord configuration file was found. Values containing
non-alphanumeric characters should be quoted (e.g. KEY="val:123",KEY2="val,456").
Otherwise, quoting the values is optional but recommended. To escape percent
characters, simply use two. (e.g. URI="/first%%20name") Note that subprocesses will
inherit the environment variables of the shell used to start supervisord except for the
ones overridden here and within the program's environment option. See
subprocess_environment.
Default: no values
Required: No.
Introduced: 3.0
identifier
The identifier string for this supervisor process, used by the RPC interface.
Default: supervisor
Required: No.
Introduced: 3.0
[supervisord] Section Example
[supervisord]
logfile = /tmp/supervisord.log
logfile_maxbytes = 50MB
logfile_backups=10
loglevel = info
pidfile = /tmp/supervisord.pid
nodaemon = false
minfds = 1024
minprocs = 200
umask = 022
user = chrism
identifier = supervisor
directory = /tmp
nocleanup = true
childlogdir = /tmp
strip_ansi = false
environment = KEY1="value1",KEY2="value2"
[supervisorctl] Section Settings
The configuration file may contain settings for the supervisorctl interactive shell
program. These options are listed below.
[supervisorctl] Section Values
serverurl
The URL that should be used to access the supervisord server, e.g.
http://localhost:9001. For UNIX domain sockets, use
unix:///absolute/path/to/file.sock.
Default: http://localhost:9001
Required: No.
Introduced: 3.0
username
The username to pass to the supervisord server for use in authentication. This should
be same as username from the supervisord server configuration for the port or UNIX
domain socket you're attempting to access.
Default: No username
Required: No.
Introduced: 3.0
password
The password to pass to the supervisord server for use in authentication. This should
be the cleartext version of password from the supervisord server configuration for the
port or UNIX domain socket you're attempting to access. This value cannot be passed as
a SHA hash. Unlike other passwords specified in this file, it must be provided in
cleartext.
Default: No password
Required: No.
Introduced: 3.0
prompt
String used as supervisorctl prompt.
Default: supervisor
Required: No.
Introduced: 3.0
history_file
A path to use as the readline persistent history file. If you enable this feature by
choosing a path, your supervisorctl commands will be kept in the file, and you can use
readline (e.g. arrow-up) to invoke commands you performed in your last supervisorctl
session.
Default: No file
Required: No.
Introduced: 3.0a5
[supervisorctl] Section Example
[supervisorctl]
serverurl = unix:///tmp/supervisor.sock
username = chris
password = 123
prompt = mysupervisor
[program:x] Section Settings
The configuration file must contain one or more program sections in order for supervisord
to know which programs it should start and control. The header value is composite value.
It is the word "program", followed directly by a colon, then the program name. A header
value of [program:foo] describes a program with the name of "foo". The name is used
within client applications that control the processes that are created as a result of this
configuration. It is an error to create a program section that does not have a name. The
name must not include a colon character or a bracket character. The value of the name is
used as the value for the %(program_name)s string expression expansion within other values
where specified.
NOTE:
A [program:x] section actually represents a "homogeneous process group" to supervisor
(as of 3.0). The members of the group are defined by the combination of the numprocs
and process_name parameters in the configuration. By default, if numprocs and
process_name are left unchanged from their defaults, the group represented by
[program:x] will be named x and will have a single process named x in it. This
provides a modicum of backwards compatibility with older supervisor releases, which did
not treat program sections as homogeneous process group definitions.
But for instance, if you have a [program:foo] section with a numprocs of 3 and a
process_name expression of %(program_name)s_%(process_num)02d, the "foo" group will
contain three processes, named foo_00, foo_01, and foo_02. This makes it possible to
start a number of very similar processes using a single [program:x] section. All
logfile names, all environment strings, and the command of programs can also contain
similar Python string expressions, to pass slightly different parameters to each
process.
[program:x] Section Values
command
The command that will be run when this program is started. The command can be either
absolute (e.g. /path/to/programname) or relative (e.g. programname). If it is
relative, the supervisord's environment $PATH will be searched for the executable.
Programs can accept arguments, e.g. /path/to/program foo bar. The command line can use
double quotes to group arguments with spaces in them to pass to the program, e.g.
/path/to/program/name -p "foo bar". Note that the value of command may include Python
string expressions, e.g. /path/to/programname --port=80%(process_num)02d might expand
to /path/to/programname --port=8000 at runtime. String expressions are evaluated
against a dictionary containing the keys group_name, host_node_name, process_num,
program_name, here (the directory of the supervisord config file), and all
supervisord's environment variables prefixed with ENV_. Controlled programs should
themselves not be daemons, as supervisord assumes it is responsible for daemonizing its
subprocesses (see nondaemonizing_of_subprocesses).
Default: No default.
Required: Yes.
Introduced: 3.0
process_name
A Python string expression that is used to compose the supervisor process name for this
process. You usually don't need to worry about setting this unless you change
numprocs. The string expression is evaluated against a dictionary that includes
group_name, host_node_name, process_num, program_name, and here (the directory of the
supervisord config file).
Default: %(program_name)s
Required: No.
Introduced: 3.0
numprocs
Supervisor will start as many instances of this program as named by numprocs. Note
that if numprocs > 1, the process_name expression must include %(process_num)s (or any
other valid Python string expression that includes process_num) within it.
Default: 1
Required: No.
Introduced: 3.0
numprocs_start
An integer offset that is used to compute the number at which numprocs starts.
Default: 0
Required: No.
Introduced: 3.0
priority
The relative priority of the program in the start and shutdown ordering. Lower
priorities indicate programs that start first and shut down last at startup and when
aggregate commands are used in various clients (e.g. "start all"/"stop all"). Higher
priorities indicate programs that start last and shut down first.
Default: 999
Required: No.
Introduced: 3.0
autostart
If true, this program will start automatically when supervisord is started.
Default: true
Required: No.
Introduced: 3.0
startsecs
The total number of seconds which the program needs to stay running after a startup to
consider the start successful (moving the process from the STARTING state to the
RUNNING state). Set to 0 to indicate that the program needn't stay running for any
particular amount of time.
NOTE:
Even if a process exits with an "expected" exit code (see exitcodes), the start
will still be considered a failure if the process exits quicker than startsecs.
Default: 1
Required: No.
Introduced: 3.0
startretries
The number of serial failure attempts that supervisord will allow when attempting to
start the program before giving up and putting the process into an FATAL state. See
process_states for explanation of the FATAL state.
Default: 3
Required: No.
Introduced: 3.0
autorestart
Specifies if supervisord should automatically restart a process if it exits when it is
in the RUNNING state. May be one of false, unexpected, or true. If false, the process
will not be autorestarted. If unexpected, the process will be restarted when the
program exits with an exit code that is not one of the exit codes associated with this
process' configuration (see exitcodes). If true, the process will be unconditionally
restarted when it exits, without regard to its exit code.
NOTE:
autorestart controls whether supervisord will autorestart a program if it exits
after it has successfully started up (the process is in the RUNNING state).
supervisord has a different restart mechanism for when the process is starting up
(the process is in the STARTING state). Retries during process startup are
controlled by startsecs and startretries.
Default: unexpected
Required: No.
Introduced: 3.0
exitcodes
The list of "expected" exit codes for this program used with autorestart. If the
autorestart parameter is set to unexpected, and the process exits in any other way than
as a result of a supervisor stop request, supervisord will restart the process if it
exits with an exit code that is not defined in this list.
Default: 0,2
Required: No.
Introduced: 3.0
stopsignal
The signal used to kill the program when a stop is requested. This can be any of TERM,
HUP, INT, QUIT, KILL, USR1, or USR2.
Default: TERM
Required: No.
Introduced: 3.0
stopwaitsecs
The number of seconds to wait for the OS to return a SIGCHILD to supervisord after the
program has been sent a stopsignal. If this number of seconds elapses before
supervisord receives a SIGCHILD from the process, supervisord will attempt to kill it
with a final SIGKILL.
Default: 10
Required: No.
Introduced: 3.0
stopasgroup
If true, the flag causes supervisor to send the stop signal to the whole process group
and implies killasgroup is true. This is useful for programs, such as Flask in debug
mode, that do not propagate stop signals to their children, leaving them orphaned.
Default: false
Required: No.
Introduced: 3.0b1
killasgroup
If true, when resorting to send SIGKILL to the program to terminate it send it to its
whole process group instead, taking care of its children as well, useful e.g with
Python programs using multiprocessing.
Default: false
Required: No.
Introduced: 3.0a11
user
Instruct supervisord to use this UNIX user account as the account which runs the
program. The user can only be switched if supervisord is run as the root user. If
supervisord can't switch to the specified user, the program will not be started.
NOTE:
The user will be changed using setuid only. This does not start a login shell and
does not change environment variables like USER or HOME. See
subprocess_environment for details.
Default: Do not switch users
Required: No.
Introduced: 3.0
redirect_stderr
If true, cause the process' stderr output to be sent back to supervisord on its stdout
file descriptor (in UNIX shell terms, this is the equivalent of executing /the/program
2>&1).
NOTE:
Do not set redirect_stderr=true in an [eventlistener:x] section. Eventlisteners
use stdout and stdin to communicate with supervisord. If stderr is redirected,
output from stderr will interfere with the eventlistener protocol.
Default: false
Required: No.
Introduced: 3.0, replaces 2.0's log_stdout and log_stderr
stdout_logfile
Put process stdout output in this file (and if redirect_stderr is true, also place
stderr output in this file). If stdout_logfile is unset or set to AUTO, supervisor
will automatically choose a file location. If this is set to NONE, supervisord will
create no log file. AUTO log files and their backups will be deleted when supervisord
restarts. The stdout_logfile value can contain Python string expressions that will
evaluated against a dictionary that contains the keys group_name, host_node_name,
process_num, program_name, and here (the directory of the supervisord config file).
NOTE:
It is not possible for two processes to share a single log file (stdout_logfile)
when rotation (stdout_logfile_maxbytes) is enabled. This will result in the file
being corrupted.
Default: AUTO
Required: No.
Introduced: 3.0, replaces 2.0's logfile
stdout_logfile_maxbytes
The maximum number of bytes that may be consumed by stdout_logfile before it is rotated
(suffix multipliers like "KB", "MB", and "GB" can be used in the value). Set this
value to 0 to indicate an unlimited log size.
Default: 50MB
Required: No.
Introduced: 3.0, replaces 2.0's logfile_maxbytes
stdout_logfile_backups
The number of stdout_logfile backups to keep around resulting from process stdout log
file rotation. If set to 0, no backups will be kept.
Default: 10
Required: No.
Introduced: 3.0, replaces 2.0's logfile_backups
stdout_capture_maxbytes
Max number of bytes written to capture FIFO when process is in "stdout capture mode"
(see capture_mode). Should be an integer (suffix multipliers like "KB", "MB" and "GB"
can used in the value). If this value is 0, process capture mode will be off.
Default: 0
Required: No.
Introduced: 3.0, replaces 2.0's logfile_backups
stdout_events_enabled
If true, PROCESS_LOG_STDOUT events will be emitted when the process writes to its
stdout file descriptor. The events will only be emitted if the file descriptor is not
in capture mode at the time the data is received (see capture_mode).
Default: 0
Required: No.
Introduced: 3.0a7
stderr_logfile
Put process stderr output in this file unless redirect_stderr is true. Accepts the
same value types as stdout_logfile and may contain the same Python string expressions.
NOTE:
It is not possible for two processes to share a single log file (stderr_logfile)
when rotation (stderr_logfile_maxbytes) is enabled. This will result in the file
being corrupted.
Default: AUTO
Required: No.
Introduced: 3.0
stderr_logfile_maxbytes
The maximum number of bytes before logfile rotation for stderr_logfile. Accepts the
same value types as stdout_logfile_maxbytes.
Default: 50MB
Required: No.
Introduced: 3.0
stderr_logfile_backups
The number of backups to keep around resulting from process stderr log file rotation.
If set to 0, no backups will be kept.
Default: 10
Required: No.
Introduced: 3.0
stderr_capture_maxbytes
Max number of bytes written to capture FIFO when process is in "stderr capture mode"
(see capture_mode). Should be an integer (suffix multipliers like "KB", "MB" and "GB"
can used in the value). If this value is 0, process capture mode will be off.
Default: 0
Required: No.
Introduced: 3.0
stderr_events_enabled
If true, PROCESS_LOG_STDERR events will be emitted when the process writes to its
stderr file descriptor. The events will only be emitted if the file descriptor is not
in capture mode at the time the data is received (see capture_mode).
Default: false
Required: No.
Introduced: 3.0a7
environment
A list of key/value pairs in the form KEY="val",KEY2="val2" that will be placed in the
child process' environment. The environment string may contain Python string
expressions that will be evaluated against a dictionary containing group_name,
host_node_name, process_num, program_name, and here (the directory of the supervisord
config file). Values containing non-alphanumeric characters should be quoted (e.g.
KEY="val:123",KEY2="val,456"). Otherwise, quoting the values is optional but
recommended. Note that the subprocess will inherit the environment variables of the
shell used to start "supervisord" except for the ones overridden here. See
subprocess_environment.
Default: No extra environment
Required: No.
Introduced: 3.0
directory
A file path representing a directory to which supervisord should temporarily chdir
before exec'ing the child.
Default: No chdir (inherit supervisor's)
Required: No.
Introduced: 3.0
umask
An octal number (e.g. 002, 022) representing the umask of the process.
Default: No special umask (inherit supervisor's)
Required: No.
Introduced: 3.0
serverurl
The URL passed in the environment to the subprocess process as SUPERVISOR_SERVER_URL
(see supervisor.childutils) to allow the subprocess to easily communicate with the
internal HTTP server. If provided, it should have the same syntax and structure as the
[supervisorctl] section option of the same name. If this is set to AUTO, or is unset,
supervisor will automatically construct a server URL, giving preference to a server
that listens on UNIX domain sockets over one that listens on an internet socket.
Default: AUTO
Required: No.
Introduced: 3.0
[program:x] Section Example
[program:cat]
command=/bin/cat
process_name=%(program_name)s
numprocs=1
directory=/tmp
umask=022
priority=999
autostart=true
autorestart=unexpected
startsecs=10
startretries=3
exitcodes=0,2
stopsignal=TERM
stopwaitsecs=10
stopasgroup=false
killasgroup=false
user=chrism
redirect_stderr=false
stdout_logfile=/a/path
stdout_logfile_maxbytes=1MB
stdout_logfile_backups=10
stdout_capture_maxbytes=1MB
stdout_events_enabled=false
stderr_logfile=/a/path
stderr_logfile_maxbytes=1MB
stderr_logfile_backups=10
stderr_capture_maxbytes=1MB
stderr_events_enabled=false
environment=A="1",B="2"
serverurl=AUTO
[include] Section Settings
The supervisord.conf file may contain a section named [include]. If the configuration
file contains an [include] section, it must contain a single key named "files". The
values in this key specify other configuration files to be included within the
configuration.
[include] Section Values
files
A space-separated sequence of file globs. Each file glob may be absolute or relative.
If the file glob is relative, it is considered relative to the location of the
configuration file which includes it. A "glob" is a file pattern which matches a
specified pattern according to the rules used by the Unix shell. No tilde expansion is
done, but *, ?, and character ranges expressed with [] will be correctly matched.
Recursive includes from included files are not supported.
Default: No default (required)
Required: Yes.
Introduced: 3.0
[include] Section Example
[include]
files = /an/absolute/filename.conf /an/absolute/*.conf foo.conf config??.conf
[group:x] Section Settings
It is often useful to group "homogeneous" process groups (aka "programs") together into a
"heterogeneous" process group so they can be controlled as a unit from Supervisor's
various controller interfaces.
To place programs into a group so you can treat them as a unit, define a [group:x] section
in your configuration file. The group header value is a composite. It is the word
"group", followed directly by a colon, then the group name. A header value of [group:foo]
describes a group with the name of "foo". The name is used within client applications
that control the processes that are created as a result of this configuration. It is an
error to create a group section that does not have a name. The name must not include a
colon character or a bracket character.
For a [group:x], there must be one or more [program:x] sections elsewhere in your
configuration file, and the group must refer to them by name in the programs value.
If "homogeneous" process groups (represented by program sections) are placed into a
"heterogeneous" group via [group:x] section's programs line, the homogeneous groups that
are implied by the program section will not exist at runtime in supervisor. Instead, all
processes belonging to each of the homogeneous groups will be placed into the
heterogeneous group. For example, given the following group configuration:
[group:foo]
programs=bar,baz
priority=999
Given the above, at supervisord startup, the bar and baz homogeneous groups will not
exist, and the processes that would have been under them will now be moved into the foo
group.
[group:x] Section Values
programs
A comma-separated list of program names. The programs which are listed become members
of the group.
Default: No default (required)
Required: Yes.
Introduced: 3.0
priority
A priority number analogous to a [program:x] priority value assigned to the group.
Default: 999
Required: No.
Introduced: 3.0
[group:x] Section Example
[group:foo]
programs=bar,baz
priority=999
[fcgi-program:x] Section Settings
Supervisor can manage groups of FastCGI processes that all listen on the same socket.
Until now, deployment flexibility for FastCGI was limited. To get full process
management, you could use mod_fastcgi under Apache but then you were stuck with Apache's
inefficient concurrency model of one process or thread per connection. In addition to
requiring more CPU and memory resources, the process/thread per connection model can be
quickly saturated by a slow resource, preventing other resources from being served. In
order to take advantage of newer event-driven web servers such as lighttpd or nginx which
don't include a built-in process manager, you had to use scripts like cgi-fcgi or
spawn-fcgi. These can be used in conjunction with a process manager such as supervisord
or daemontools but require each FastCGI child process to bind to its own socket. The
disadvantages of this are: unnecessarily complicated web server configuration, ungraceful
restarts, and reduced fault tolerance. With fewer sockets to configure, web server
configurations are much smaller if groups of FastCGI processes can share sockets. Shared
sockets allow for graceful restarts because the socket remains bound by the parent process
while any of the child processes are being restarted. Finally, shared sockets are more
fault tolerant because if a given process fails, other processes can continue to serve
inbound connections.
With integrated FastCGI spawning support, Supervisor gives you the best of both worlds.
You get full-featured process management with groups of FastCGI processes sharing sockets
without being tied to a particular web server. It's a clean separation of concerns,
allowing the web server and the process manager to each do what they do best.
NOTE:
The socket manager in Supervisor was originally developed to support FastCGI processes
but it is not limited to FastCGI. Other protocols may be used as well with no special
configuration. Any program that can access an open socket from a file descriptor (e.g.
with socket.fromfd in Python) can use the socket manager. Supervisor will
automatically create the socket, bind, and listen before forking the first child in a
group. The socket will be passed to each child on file descriptor number 0 (zero).
When the last child in the group exits, Supervisor will close the socket.
All the options available to [program:x] sections are also respected by fcgi-program
sections.
[fcgi-program:x] Section Values
[fcgi-program:x] sections have a single key which [program:x] sections do not have.
socket
The FastCGI socket for this program, either TCP or UNIX domain socket. For TCP sockets,
use this format: tcp://localhost:9002. For UNIX domain sockets, use
unix:///absolute/path/to/file.sock. String expressions are evaluated against a
dictionary containing the keys "program_name" and "here" (the directory of the
supervisord config file).
Default: No default.
Required: Yes.
Introduced: 3.0
socket_owner
For UNIX domain sockets, this parameter can be used to specify the user and group for
the FastCGI socket. May be a UNIX username (e.g. chrism) or a UNIX username and group
separated by a colon (e.g. chrism:wheel).
Default: Uses the user and group set for the fcgi-program
Required: No.
Introduced: 3.0
socket_mode
For UNIX domain sockets, this parameter can be used to specify the permission mode.
Default: 0700
Required: No.
Introduced: 3.0
Consult [program:x] Section Settings for other allowable keys, delta the above constraints
and additions.
[fcgi-program:x] Section Example
[fcgi-program:fcgiprogramname]
command=/usr/bin/example.fcgi
socket=unix:///var/run/supervisor/%(program_name)s.sock
socket_owner=chrism
socket_mode=0700
process_name=%(program_name)s_%(process_num)02d
numprocs=5
directory=/tmp
umask=022
priority=999
autostart=true
autorestart=unexpected
startsecs=1
startretries=3
exitcodes=0,2
stopsignal=QUIT
stopasgroup=false
killasgroup=false
stopwaitsecs=10
user=chrism
redirect_stderr=true
stdout_logfile=/a/path
stdout_logfile_maxbytes=1MB
stdout_logfile_backups=10
stdout_events_enabled=false
stderr_logfile=/a/path
stderr_logfile_maxbytes=1MB
stderr_logfile_backups=10
stderr_events_enabled=false
environment=A="1",B="2"
serverurl=AUTO
[eventlistener:x] Section Settings
Supervisor allows specialized homogeneous process groups ("event listener pools") to be
defined within the configuration file. These pools contain processes that are meant to
receive and respond to event notifications from supervisor's event system. See events for
an explanation of how events work and how to implement programs that can be declared as
event listeners.
Note that all the options available to [program:x] sections are respected by eventlistener
sections except for stdout_capture_maxbytes and stderr_capture_maxbytes (event listeners
cannot emit process communication events, see capture_mode).
[eventlistener:x] Section Values
[eventlistener:x] sections have a few keys which [program:x] sections do not have.
buffer_size
The event listener pool's event queue buffer size. When a listener pool's event buffer
is overflowed (as can happen when an event listener pool cannot keep up with all of the
events sent to it), the oldest event in the buffer is discarded.
events
A comma-separated list of event type names that this listener is "interested" in
receiving notifications for (see event_types for a list of valid event type names).
result_handler
A pkg_resources entry point string that resolves to a Python callable. The default
value is supervisor.dispatchers:default_handler. Specifying an alternate result
handler is a very uncommon thing to need to do, and as a result, how to create one is
not documented.
Consult [program:x] Section Settings for other allowable keys, delta the above constraints
and additions.
[eventlistener:x] Section Example
[eventlistener:theeventlistenername]
command=/bin/eventlistener
process_name=%(program_name)s_%(process_num)02d
numprocs=5
events=PROCESS_STATE
buffer_size=10
directory=/tmp
umask=022
priority=-1
autostart=true
autorestart=unexpected
startsecs=1
startretries=3
exitcodes=0,2
stopsignal=QUIT
stopwaitsecs=10
stopasgroup=false
killasgroup=false
user=chrism
redirect_stderr=false
stdout_logfile=/a/path
stdout_logfile_maxbytes=1MB
stdout_logfile_backups=10
stdout_events_enabled=false
stderr_logfile=/a/path
stderr_logfile_maxbytes=1MB
stderr_logfile_backups=10
stderr_events_enabled=false
environment=A="1",B="2"
serverurl=AUTO
[rpcinterface:x] Section Settings
Adding rpcinterface:x settings in the configuration file is only useful for people who
wish to extend supervisor with additional custom behavior.
In the sample config file, there is a section which is named [rpcinterface:supervisor].
By default it looks like the following.
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
The [rpcinterface:supervisor] section must remain in the configuration for the standard
setup of supervisor to work properly. If you don't want supervisor to do anything it
doesn't already do out of the box, this is all you need to know about this type of
section.
However, if you wish to add rpc interface namespaces in order to customize supervisor, you
may add additional [rpcinterface:foo] sections, where "foo" represents the namespace of
the interface (from the web root), and the value named by supervisor.rpcinterface_factory
is a factory callable which should have a function signature that accepts a single
positional argument supervisord and as many keyword arguments as required to perform
configuration. Any extra key/value pairs defined within the [rpcinterface:x] section will
be passed as keyword arguments to the factory.
Here's an example of a factory function, created in the __init__.py file of the Python
package my.package.
from my.package.rpcinterface import AnotherRPCInterface
def make_another_rpcinterface(supervisord, **config):
retries = int(config.get('retries', 0))
another_rpc_interface = AnotherRPCInterface(supervisord, retries)
return another_rpc_interface
And a section in the config file meant to configure it.
[rpcinterface:another]
supervisor.rpcinterface_factory = my.package:make_another_rpcinterface
retries = 1
[rpcinterface:x] Section Values
supervisor.rpcinterface_factory
pkg_resources "entry point" dotted name to your RPC interface's factory function.
Default: N/A
Required: No.
Introduced: 3.0
[rpcinterface:x] Section Example
[rpcinterface:another]
supervisor.rpcinterface_factory = my.package:make_another_rpcinterface
retries = 1
Glossary
daemontools
A process control system by D.J. Bernstein.
launchd
A process control system used by Apple as process 1 under Mac OS X.
runit A process control system.
Superlance
A package which provides various event listener implementations that plug into
Supervisor which can help monitor process memory usage and crash status:
http://pypi.python.org/pypi/superlance.
umask Abbreviation of user mask: sets the file mode creation mask of the current process.
See http://en.wikipedia.org/wiki/Umask.
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