Create uWSGI Socket in other folder? - django

I want to create uWsgi socket in my project folder and not in /tmp/
Here's my uWSGI config
[uwsgi]
socket = /tmp/uwsgi.sock #I want this in any other folder
#say in /home/me/Desktop/myDjangoApp/
chmod-socket = 666
processes = 1
master = true
vhost = true
no-site = true
But whenever I restart uWSGI with the socket created in my folder, it [fails].
Can't I create the uwsgi.sock in other folder?

I use the following uwsgi config (reduced to relevant parts):
[uwsgi]
uid = moin
gid = www-data
socket = /var/run/moin/uwsgi.sock
hook-as-root = exec:mkdir -vp /var/run/moin/; chown -v moin:www-data /var/run/moin/
Note the hook which creates the /var/run/wiki/ directory with user permissions before the server drops privileges. Call the directory whatever you want, moin was the name of my wiki engine.
On newer distros, /var/run points to a tmpfs location so that any manually created directory gets dropped after a reboot. The hook definition in this file keeps your configuration compact, compared to adding/modifying another init script.

Well, I found an alternative solution for the same. I created the socket in localhost
Here is my uwsgi file
[uwsgi]
uid = www-data
gid = www-data
master = 1
workers = 2
plugins = python
socket = 127.0.0.1:3100
enable-threads = true
processes = 2
pythonpath = <>
wsgi-file = <>
chdir = <>

unix sockets must obey to file permission schemes.
In the second config you're seting uid=www-data and gid=www-data.
The socket file must be writable by www-data and nginx must be able to read/write /tmp/uwsgi.sock
On the other hand if you find that difficult, using host:port (tcp sockets) will work too and you've seem to be able to do it like that.

Related

Touch command kill uWSGI service

I'm getting a little issue with uWSGI and my Django application on production server. I have a FreeBSD jail which has only one Django application. When I made code improvements, I do a touch on settings file in order to take into account modifications.
However, touch kills my uWSGI service each time. So I need to start uWSGI manually else I get a 502 Bad Gateway issue with my browser.
Environment:
Django version : 1.11.20
uWSGI version : 2.0.15
Python version : 3.6.2
uWSGI.ini file:
This is my uwsgi.ini file :
[uwsgi]
pythonpath=/usr/local/www/app/src/web
virtualenv = /usr/local/www/app/venv
module=main.wsgi:application
env = DJANGO_SETTINGS_MODULE=main.settings.prod
env = no_proxy=*.toto.fr
env = LANG=en_US.UTF-8
master=true
processes=2
vaccum=true
chmod-socket=660
chown-socket=www:www
socket=/tmp/uwsgi.sock
socket-timeout = 60
post-buffering = 8192
max-requests = 5000
buffer-size = 32768
offload-threads = 1
uid=www
gid=www
logdate=true
log-maxsize = 20000000
manage-script-name=true
touch-reload = /usr/local/www/app/src/web/main/settings/prod.py
Issue:
When I make a deployment, once it's done, I do :
touch /usr/local/www/app/src/web/main/settings/prod.py
Then I have my uWSGI service out.
This is the last log I have :
Thank you very much !

In this case, How to set uwsgi.ini?

I will use uwsgi on AWS EC2 service.
I structured my server's workflow like this.
Internet - ElasticLoadBalancer-a - webserver-nginx - ElasticLoadBalancer-b - web-application-django_uwsgi_server - RDS
So between webserver-nginx and web-application-django_uwsgi_server, There will be communication through http data.
Also you should know that I run web-application-django_uwsgi_server on a docker container. Like, docker run --name django_uwsgi -p 8080:8000 djangoproject_and_uwsgi:1.0
And I set uwsgi ini file like this.
uwsgi.ini in docker container:
[uwsgi]
chdir = /sampledir
wsgi-file = /sampledir/sample/wsgi.py
master = true
processes = 10
# cron = -5 -1 -1 -1 -1 /path/to/some/script
harakiri=20
max-requests=5000
vacuum = true
enable-threads = true
single-interpreter = true
lazy-apps = true
# From this line, I ask these below options.
http = 0.0.0.0:8000
# the socket (use the full path to be safe
# socket = /path/to/your/project/mysite.sock
# chmod-socket = 664
I'm newbie in linux and network, but heard that socket settings will be better than just setting like http = 8000. Because of http overheads.
But I had webserver-nginx on another EC2 instance. In other words, webserver-nginx and web-application-django_uwsgi_server are not on the same EC2 instance(machine).
QUESTION:
In this case, How can I set socket or port settings appropriately?

"[Errno 12] Cannot allocate memory" on Geoip2() in Django with uWSGI

The following code runs successfully in manage.py shell:
from django.contrib.gis.geoip2 import GeoIP2
g = GeoIP2()
If I start the server manually with manage.py runserver
and put the code in my Django view, it also runs fine.
My Django application is hosted with uWSGI and Nginx as reverse proxy.
Both uWSGI and Nginx run with www-data user.
Here is the exception that I get when running on uWSGI:
...
File "/home/myuser/Env/virtenv/myproject/index/views.py" in index
28. g = GeoIP2()
File "/home/myuser/Env/virtenv/local/lib/python2.7/site-packages/django/contrib/gis/geoip2/base.py" in __init__
95. self._city = geoip2.database.Reader(city_db, mode=cache)
File "/home/myuser/Env/virtenv/local/lib/python2.7/site-packages/geoip2/database.py" in __init__
82. self._db_reader = maxminddb.open_database(filename, mode)
File "/home/myuser/Env/virtenv/local/lib/python2.7/site-packages/maxminddb/__init__.py" in open_database
37. return maxminddb.reader.Reader(database, mode)
File "/home/myuser/Env/virtenv/local/lib/python2.7/site-packages/maxminddb/reader.py" in __init__
52. db_file.fileno(), 0, access=mmap.ACCESS_READ)
Exception Type: error at /
Exception Value: [Errno 12] Cannot allocate memory
Local variables are:
Variable Value
database '/home/myuser/Env/virtenv/myproject/geoip/GeoLite2-City.mmdb'
db_file <closed file '/home/myuser/Env/virtenv/myproject/geoip/GeoLite2-City.mmdb', mode 'rb' at 0x7f8c5cf5d390>
mode 0
self <maxminddb.reader.Reader object at 0x7f8c5cf5f550>
I use Virtualbox and my guest OS is Ubuntu 16.04. I have 4GB swap file there.
If I free up some RAM the problem persists.
This shouldn't be a memory issue on OS level, though,
as I can create the GeoIP2 object in the shell and also if I run the server manually.
Next thing I checked is that the geoip directory in my project is owned by www-data and has 775.
Both files inside (GeoLite2-City.mmdb and GeoLite2-Country.mmdb) are also owned by www-data and have 774.
/etc/systemd/system/uwsgi.service contains:
[Unit]
Description=uWSGI Emperor service
[Service]
ExecStartPre=/bin/bash -c 'mkdir -p /run/uwsgi; chown www-data:www-data /run/uwsgi'
ExecStart=/usr/local/bin/uwsgi --emperor /etc/uwsgi/sites
Restart=always
KillSignal=SIGQUIT
Type=notify
NotifyAccess=all
[Install]
WantedBy=multi-user.target
/etc/uwsgi/sites/my_site.ini contains:
[uwsgi]
project = myproject
base = /home/myuser
home = %(base)/Env/virtenv/%(project)
binary-path = /usr/local/bin/uwsgi
chdir = %(home)
chmod-socket = 660
chown-socket = www-data:www-data
#emperor = true
#enable-threads = true
gid = www-data
limit-as = 1024
logto = /tmp/uwsgi.log
master = true
module = myproject.wsgi:application
pidfile = /opt/logs/uwsgi/master.pid
# number of cores on machine
processes = 2
python-path = %(home)
py-autoreload = 2
socket = /run/uwsgi/%(project).sock
uid = www-data
vacuum = true
virtualenv = %(base)/Env/virtenv
vhost = true
workers = 4
env = AWS_KEY=***************
env = AWS_SECRET=***************
env = DJANGO_SETTINGS_MODULE=myproject.settings.local
env = GMAIL_PASS=***************
env = PSQL_PASS=***************
env = SECRET_KEY=*********************************************
I am wondering where the limitation of uWSGI is?
limit-as = 512 in uWSGI's ini file was the culprit. Doubling it to 1024 mb resolves the problem.
From the official uWSGI 2 documentation here:
limit-as
Argument: number
Limit process address space (vsz) (in megabytes).
Limits the address space usage of each uWSGI (worker) process using
POSIX/UNIX setrlimit(). For example, limit-as 256 will disallow uWSGI
processes to grow over 256MB of address space. Address space is the
virtual memory a process has access to. It does not correspond to
physical memory. Read and understand this page before enabling this
option: http://en.wikipedia.org/wiki/Virtual_memory

start: Job failed to start UWSGI,

Trying to configure ubuntu+nginx+uwsgi+django
upstart script /etc/init/uwsgi.conf
description "uWSGI application server in Emperor mode"
start on runlevel [2345]
stop on runlevel [!2345]
setuid voxa
setgid www-data
exec /usr/local/bin/uwsgi --emperor /etc/uwsgi/sites
uwsgi configuration
[uwsgi]
project = project
base = /home/user
chdir = %(base)/%(project)
home = home/user/Env/project_env
module = %(project).wsgi:application
master = true
processes = 5
socket = %(base)/%(project)/%(project).sock
chmod-socket = 664
vacuum = true
socket = %(base)/%(project)/%(project).sock
chmod-socket = 664
vacuum = true
But after running the command sudo service uwsgi start I get an error
start: Job failed to start
What should I check to handle it?
UPD:
with virtualenv enabled app successfully runs with uwsgi command
uwsgi --http :8000 --module project.wsgi
uWSGI doesn't have permissions to create socket file in specified directory. To solve that, you can run emperor as root and drop privileges in vassal, after creating socket. Simply add to your vassal config:
username = voxa
gropuname = www-data
And remove setuid and setgid from your upstart config file.
If you're worried that someone will abuse that and use other user/group, you can use emperor tyrant mode, by adding --emperor-tyrant to uwsgi start line in upstart config. That will disallow change of username and groupname to other than owner of vassal config file.

uwsgi worker processes keep running

I am using emperor mode and noticed a couple of uwsgi worker processes keep using CPU.
Here is the ini config for the particular website
[uwsgi]
socket = /tmp/%n.sock
master = true
processes = 2
env = DJANGO_SETTINGS_MODULE=abc.settings
module = django.core.handlers.wsgi:WSGIHandler()
pythonpath = /var/www/abc/abc
chdir = /var/www/abc/abc
chmod-socket = 666
uid = www-data
virtualenv = /var/www/abc
vacuum = true
procname-prefix-spaced = %n
plugins = python
enable-threads = true
single-interpreter = true
sharedarea = 4
htop shows:
13658 www-data 20 0 204M 59168 4148 S 3.0 3.5 3h03:50 abc uWSGI worker 1
13659 www-data 20 0 209M 65092 4428 S 1.0 3.8 3h02:02 abc uWSGI worker 2
I have checked nginx and uwsgi log and both not showing the site is be accessed.
The question is:
why the workers keep using around 1-5% of the CPU when the site is not being accessed.
I think I have found the cause of this, in development, I am using the timer to monitor code changes then reload the uwsgi processes, and I think it's because the project is using django-cms and it's kind of big, so constantly monitoring for code changes every second is kind of heavy, after changing the timer to 5 seconds the processes actually gone quiet.