The python script supervisord is a powerful tool used by a lot of guys to manage the processes. I like the tool supervisord also.

But this tool requires us to install the big python environment. In some situation, for example in the docker environment, the python is too big for us.

In this project, the supervisord is re-implemented in go-lang. The compiled supervisord is very suitable for these environment that the python is not installed.

Before compiling the supervisord, make sure the go-lang is installed in your environement.

To compile the go-lang version supervisord, run following commands (required go 1.11+):

1. local: go build
2. linux: env GOOS=linux GOARCH=amd64 go build -o supervisord_linux_amd64

After the supervisord binary is generated, create a supervisord configuration file and start the supervisord like below:

$ cat supervisor.conf
[program:test]
command = /your/program args
$ supervisord -c supervisor.conf

Add the inet interface in your configuration:

[inet_http_server]
port=127.0.0.1:9001

then run

$ supervisord -c supervisor.conf -d

In order to controll the daemon, you can use $ supervisord ctl subcommand, available commands are: status, start, stop, shutdown, reload.

$ supervisord ctl status
$ supervisord ctl status program-1 program-2...
$ supervisord ctl status group:*
$ supervisord ctl stop program-1 program-2...
$ supervisord ctl stop group:*
$ supervisord ctl stop all
$ supervisord ctl start program-1 program-2...
$ supervisord ctl start group:*
$ supervisord ctl start all
$ supervisord ctl shutdown
$ supervisord ctl reload
$ supervisord ctl signal <signal_name> <process_name> <process_name> ...
$ supervisord ctl signal all
$ supervisord ctl pid <process_name>

the URL of supervisord in the "supervisor ctl" subcommand is dected in following order:

• check if option -s or --serverurl is present, use this url
• check if -c option is present and the "serverurl" in "supervisorctl" section is present, use the "serverurl" in section "supervisorctl"
• return http://localhost:9001

command "version" will show the current supervisor version.

$ supervisord version

the unix socket & TCP http server is supported. Basic auth is supported.

The unix socket setting is in the "unix_http_server" section. The TCP http server setting is in "inet_http_server" section.

If both "inet_http_server" and "unix_http_server" is not configured in the configuration file, no http server will be started.

The log & pid of supervisord process is supported by section "supervisord" setting.

the following features is supported in the "program:x" section:

• program command
• process name
• numprocs
• numprocs_start
• autostart
• startsecs
• startretries
• autorestart
• exitcodes
• stopsignal
• stopwaitsecs
• stdout_logfile
• stdout_logfile_maxbytes
• stdout_logfile_backups
• redirect_stderr
• stderr_logfile
• stderr_logfile_maxbytes
• stderr_logfile_backups
• environment
• priority
• user
• directory
• stopasgroup
• killasgroup
• restartpause

Following new keys are supported by the [program:xxx] section:

• depends_on: define program depends information. If program A depends on program B, C, the program B, C will be started before program A. Example:

[program:A]
depends_on = B, C

[program:B]
...
[program:C]
...

• user: user in the section "program:xxx" now is extended to support group with format "user[:group]". So "user" can be configured as:

[program:xxx]
user = user_name
...

or

[program:xxx]
user = user_name:group_name
...

• stopsignal list one or more stop signal can be configured. If more than one stopsignal is configured, when stoping the program, the supervisor will send the signals to the program one by one with interval "stopwaitsecs". If the program does not exit after all the signals sent to the program, the supervisor will kill the program

the "group" section is supported and you can set "programs" item

the supervisor 3.x defined events are supported partially. Now it supports following events:

• all process state related events
• process communication event
• remote communication event
• tick related events
• process log related events

The logs ( field stdout_logfile, stderr_logfile ) from programs managed by the supervisord can be written to:

- /dev/null, ignore the log
- /dev/stdout, write log to stdout
- /dev/stderr, write log to stderr
- syslog, write the log to local syslog
- syslog @[protocol:]host[:port], write the log to remote syslog. protocol must be "tcp" or "udp", if missing, "udp" will be used. If port is missing, for "udp" protocol, it's value is 514 and for "tcp" protocol, it's value is 6514.
- file name, write log to a file

Mutiple log file can be configured for the stdout_logfile and stderr_logfile with delimeter ',', for example if want to a program write log to both stdout and test.log file, the stdout_logfile for the program can be configured as:

stdout_logfile = test.log, /dev/stdout

This supervisord has a default web GUI, you can start, stop & check the status of program from the GUI. Following picture shows the default web GUI:

supervisord is compiled inside a Docker image to be used directly inside another image, from the Docker Hub version.

FROM debian:latest
COPY --from=ochinchina/supervisord:latest /usr/local/bin/supervisord /usr/local/bin/supervisord
CMD ["/usr/local/bin/supervisord"]

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