如何在django，uwsgi和nginx设置中反映python的更改

Question

Hi I have deployed Django using UWSGI and Nginx using following tutorial http://uwsgi-docs.readthedocs.io/en/latest/tutorials/Django_and_nginx.html Everything is running fine. I face a challenge while updating python code. I don't know the efficient way to deploy new changes. after hit and trial, I used following commands to deploy

git pull; sudo service uwsgi stop; sudo service nginx restart; sudo service uwsgi restart; /usr/local/bin/uwsgi --emperor /etc/uwsgi/vassals

this command works fine. But I face following problems

1. Usagi runs in the foreground. Every time I make changes, a new UWSGI instance start running.
2. Due to multiple UWSGI instances, My AWS server get crashed, due to memory exhaustion.

I want to know what commands should I run to reflect changes in python code. PS: in my previous APACHE Django setup, I only used to restart apache, is it possible to reflect changes by only restarting nginx.

Answer 1

Please have a look at this for running uwsgi in background. create an .ini file /etc/uwsgi/sites/projectname.ini. The script would look like this(for ubuntu 16.04):

[uwsgi]
project = projectname
base = projectpath

chdir = %(base)/%(project)
home = %(base)/Env/%(project)
module = %(project).wsgi:application

master = true
processes = 5

socket = %(base)/%(project)/%(project).sock
chmod-socket = 666
vacuum = true

(For ubuntu 16.04):

then create the following systemd script at /etc/systemd/system/uwsgi.service:

[Unit]
Description=uWSGI Emperor service
After=syslog.target

[Service]
ExecStart=/usr/local/bin/uwsgi --emperor /etc/uwsgi/sites
Restart=always
KillSignal=SIGQUIT
Type=notify
StandardError=syslog
NotifyAccess=all

[Install]
WantedBy=multi-user.target

Refresh the state of the systemd init system with this new uWSGI service on board

sudo systemctl daemon-reload

In order to start the script you'll need to run the following:

sudo systemctl start uwsgi

In order to start uWSGI on reboot, you will also need:

sudo systemctl enable uwsgi

You can use the following to check its status:

systemctl status uwsgi

(For ubuntu 14.04):

Create an upstart script for uWSGI:

sudo nano /etc/init/uwsgi.conf

Then add following lines in the above created file:

description "uWSGI application server in Emperor mode"

start on runlevel [2345]
stop on runlevel [!2345]

setuid user
setgid www-data

exec /usr/local/bin/uwsgi --emperor /etc/uwsgi/sites

Answer 2

Try this:

git pull
python manage.py migrate  # to run any migrations
sudo service uwsgi restart

Press Ctrl + Z and then bg + enter This should run the process in the background.

Please let me know if this works.