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Installation
•
Linux?
• As easy as 'pip install supervisor'
•
Windows?
• No not possible
•
Other Installation methods

Kick Start? Yes!
•
See what options exists
<echo_supervisord_conf>
•
Create your config file like this
•
What are we waiting for ???
<supervisord c /etc/supervisor/supervisord.conf>

Alright. So what does it do.
•
Not a replacement for upstart/systemd/init
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Compliments service manager. How?
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Service manager start your process on boot, but do not monitor crash
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Does not depend of pid files
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Allows non root users to start/stop/restart user level services
•
Ordering of service start up
•
Daemonizes your script and logs its <stdout> and <stderr>
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Provides hooks you could exploit in your code
•
Read it yourselves

Whats it got?
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The server <supervisord>
•
The client <supervisorctl>
•
What else?
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'XML-RPC API'
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'Web UI'
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'Event management'

Lets Process!
●
  Your process need not be a daemon
●
  Could be as simle as printing a few lines
●
Yes just print. Supervisord will log it for you.
import os
import time
sin, sout, serr = os.popen3('ps ef ')
while 1:
    print sout.read()
    print serr.read()
    time.sleep(10)
●
  Tell supervisord to manage your process
[program:process_check]
command=python /home/akandavelu/spyder/supervisord_learning/process_check.py

Start ! Stop ! Restart !
•
Relax ! supervisorctl will do it for you.
supervisorctl -u user -p 123 status process_check
supervisorctl -u user -p 123 restart process_check
supervisorctl -u user -p 123 stop process_check
supervisorctl -u user -p 123 tail process_check

That is not all
•
Process will be started in the order in which they are
specified
•
More control on process is available through events
•
Process can be started/stopped in groups
•
Complete list of process options

Lets do it on Web
•
Enable XML RPC and HTTP in supervisor config file
[unix_http_server]
file=/tmp/supervisor.sock ; (the path to the socket file)
chmod=0700 ; socket file mode (default 0700)
chown=nobody:nogroup ; socket file uid:gid owner
username=user ; (default is no username (open server))
password=123 ; (default is no password (open server))
[inet_http_server] ; inet (TCP) server disabled by default
port=127.0.0.1:9001 ; (ip_address:port specifier, *:port for all iface)
username=user ; (default is no username (open server))
password=123 ; (default is no password (open server))

Do it from another program
•
The XML RPC api allows for interaction to supervisord
programatically
import xmlrpclib
server = xmlrpclib.Server('http://localhost:9001/RPC2')
server.system.listMethods()
server.supervisor.getAllProcessInfo()

Child Process Logging
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By default stdout and stderr of child process are
stored in /tmp
•
Can be changed using 'childlogdir' param in
config file
•
Options for logging stdout and stderr to separate
files, along with max file size are available.

Events ??
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To detect process crash and respond accordingly
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Generate crash report and notify admin via mail
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How does it happen?
• User specifies event listeners in supervisor config file
• User specifies what event types the listener should be sent
• Supervisord talks to the listener via its stdin and stdout in
pre defined format

Create a listener
•
Configure a listener that subscribes for crash event
from a process
[eventlistener:check_process_crash]
command=python /home/akandavelu/spyder/supervisord_learning/check_process_crash.py
events=PROCESS_STATE_EXITED
•
Started listener would be invoked every time any
process exits
•
Listeners could aslo be configured to run at a specified
frequency

More ?
•
Writing listeners is easiers in python with
'supervisor.childutils'
•
Supervisord XML RPI can be customized
•
Configure supervisord to send mails on events
•
Automate you build
•
Third party applications using supervisord.

More ??
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Supervisord is opensource so you can contribute
•
Its extensible, so you can add more features on the
fly

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Supervisord, The Process Manager

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