Running django channels with daphne on systemd

Question

First of all, sorry for the long question, I hope a few of you have patience for this.

TL; DR: How do I load django settings correctly in systemd?

I am fol

Answer 1

Yes, supervisord did work. Key bits of the /etc/supervisor/conf.d/project_name.conf were (some further links in the commented portions):

[program:platform_asgi_daphne]
; # https://stackoverflow.com/questions/17055951/how-to-set-environment-variables-in-supervisor-service
; # https://github.com/django/daphne/pull/37
; # https://wiki.cac.washington.edu/display/infra/Extracting+Certificate+and+Private+Key+Files+from+a+.pfx+File
; # daphne -e ssl:8443:privateKey=localhost.key:certKey=localhost.crt <channel_layer>
environment =
    DJANGO_SECRET_KEY='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
    DJANGO_DEBUG='True'
directory=/path/to/project/
; # http://channels.readthedocs.io/en/stable/deploying.html
; command=/path/to/venv/bin/daphne --port 80 --bind 0.0.0.0 classact.asgi:channel_layer
command=/path/to/venv/bin/daphne -e ssl:443:privateKey=../keys/server.key:certKey=../keys/server.crt --bind 0.0.0.0 projectfoldername.asgi:channel_layer
;user=webapps
;group=webapps
user=root
group=webapps

[program:platform_asgi_workers]
; # https://github.com/django/channels/issues/408#issuecomment-276384104
environment =
    DJANGO_SECRET_KEY='xxxxxxxxxxxxxxxxxxxxxxxxx',
    DJANGO_DEBUG='True'
command=/path/to/venv/bin/python /path/to/project/manage.py runworker
process_name=asgi_worker%(process_num)s
numprocs=2
;user=webapps
user=root
group=webapps

I had a couple of issues running as the user webapps which have yet to be sorted out so they run as root (writing to an encrypted folder with odd perms). I didn't get to the point where I wasn't repeating a bunch of environment vars in each section (there is probably a way). There are several others there like the database, user, static root etc depending on the platform (prod or dev).

I also have some certs to deal with so that is shown as well (if not needed take out the ssl parts). Also note running two workers.

Answer 2

In your posted configs the daphne port seems to be off.

you wrote:

ws = new WebSocket("ws://localhost:8000/order/1/")
ws.send("test")`

while using 8001 in your systemd startup file

ExecStart=/home/ubuntu/rest-api/env/bin/daphne --access-log /home/ubuntu/rest-api/access.log -b 0.0.0.0 -p 8001 farmaApp.asgi:channel_layer

Answer 3

I've just deployed my django channel app, and the following systemd service file worked for me without using supervisor:

/etc/systemd/system/django-channels-daphne.service

[Unit]
Description=daphne server script for my project
After=network.target

[Service]
User=webuser
Group=webuser
WorkingDirectory=/path/to/myproject
Environment=DJANGO_SECRET_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Environment=DJANGO_ALLOWED_HOSTS=myapp.chatbot.ai
ExecStart=/path/to/python/virtualenv/bin/daphne -b 0.0.0.0 -p 8000 myproject.asgi:channel_layer
Restart=always

[Install]
WantedBy=multi-user.target

/etc/systemd/system/django-channels-runworker.service

[Unit]
Description=python runworker server for myproject
After=network.target

[Service]
User=webuser
Group=webuser
WorkingDirectory=/path/to/myproject
Environment=DJANGO_SECRET_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Environment=DJANGO_ALLOWED_HOSTS=myapp.chatbot.ai
ExecStart=/path/to/python/virtualenv/bin/python /path/to/myproject/manage.py runworker --threads 4 
Restart=always

[Install]
WantedBy=multi-user.target

/path/to/myproject/myproject/asgi.py

import os
import channels

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "myproject.settings")
channel_layer = channels.asgi.get_channel_layer()

Some lines in /path/to/myproject/myproject/settings.py:

ALLOWED_HOSTS = [os.environ['DJANGO_ALLOWED_HOSTS']]
SECRET_KEY = os.environ['DJANGO_SECRET_KEY']