I am running a Flask app on a Ubuntu Linode Server using Gunicorn to serve the app and nginx as a reverse proxy.
I have one app running successfully, but I have a second app where I'm running in to the following problem.
What does work
when I run FLASK_APP=tester.py python3 -m flask run
This works, tester.py runs the app bound to 0.0.0.0 on port 5100 and I can access it from my browser.
when I run gunicorn --bind 0.0.0.0:5100 wsgi:app
This also works, as my wsgi.py imports my app object making it accessible for wsgi
Useful details
which python gives me /usr/bin/python
which pip gives /usr/bin/pip and which pip3 gives /usr/bin/pip3
which python3 gives me /usr/bin/python3
which gunicorn gives me /usr/bin/gunicorn
I am not using a virtual environment since boths app have near identical dependencies
What's not working
I created a service for forwarding traffic with nginx with:
/etc/systemd/system/testpad.service
[Unit]
# specifies metadata and dependencies
Description=Gunicorn instance to serve myproject
After=network.target
# tells the init system to only start this after the networking target has been reached
# We will give our regular user account ownership of the process since it owns all of the relevant files
[Service]
# Service specify the user and group under which our process will run.
User=www-data
# give group ownership to the www-data group so that Nginx can communicate easily with the Gunicorn processes.
Group=www-data
# We'll then map out the working directory and set the PATH environmental variable so that the init system knows where our the executabl>
WorkingDirectory=/home/xxx/xxx
# We'll then specify the commanded to start the service
ExecStart=/usr/bin/gunicorn --bind unix:testpad.sock --access-logfile /home/xxx/xxx/accesslog --error-logfile /home/xxx/xxx/errorlog -m 007 wsgi:app
# This will tell systemd what to link this service to if we enable it to start at boot. We want this service to start when the regular m>
[Install]
WantedBy=multi-user.target
when I start the service it runs for a second then I get this from sudo systemctl status testpad
testpad.service - Gunicorn instance to serve myproject
Loaded: loaded (/etc/systemd/system/testpad.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2021-09-06 15:47:59 UTC; 16min ago
Process: 655575 ExecStart=/usr/bin/gunicorn --bind unix:testpad.sock --access-logfile /home/xxx/xxx/acces>
Main PID: 655575 (code=exited, status=1/FAILURE)
Sep 06 15:47:54 microportalbeta systemd[1]: Started Gunicorn instance to serve myproject.
Sep 06 15:47:59 microportalbeta systemd[1]: testpad.service: Main process exited, code=exited, status=1/FAILURE
Sep 06 15:47:59 microportalbeta systemd[1]: testpad.service: Failed with result 'exit-code'.
so when I cat errorlog I get
[2021-09-06 15:21:31 +0000] [655222] [INFO] Worker exiting (pid: 655222)
[2021-09-06 15:21:31 +0000] [655223] [ERROR] Exception in worker process
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/gunicorn/arbiter.py", line 589, in spawn_worker
worker.init_process()
File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 134, in init_process
self.load_wsgi()
File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 146, in load_wsgi
self.wsgi = self.app.wsgi()
File "/usr/lib/python3/dist-packages/gunicorn/app/base.py", line 67, in wsgi
self.callable = self.load()
File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 58, in load
return self.load_wsgiapp()
File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 48, in load_wsgiapp
return util.import_app(self.app_uri)
File "/usr/lib/python3/dist-packages/gunicorn/util.py", line 384, in import_app
mod = importlib.import_module(module)
File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 855, in exec_module
File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
File "/home/xxx/xxx/wsgi.py", line 1, in <module>
from run import app
File "/home/xxx/xxx/run.py", line 1, in <module>
from genedflask import create_app, db
File "/home/xxx/xxx/xxx/__init__.py", line 5, in <module>
from flask_login import LoginManager
ModuleNotFoundError: No module named 'flask_login'
[2021-09-06 15:21:31 +0000] [655223] [INFO] Worker exiting (pid: 655223)
[2021-09-06 15:21:32 +0000] [655220] [WARNING] Worker with pid 655223 was terminated due to signal 15
[2021-09-06 15:21:32 +0000] [655220] [WARNING] Worker with pid 655222 was terminated due to signal 15
[2021-09-06 15:21:32 +0000] [655220] [INFO] Shutting down: Master
[2021-09-06 15:21:32 +0000] [655220] [INFO] Reason: Worker failed to boot.
[2021-09-06 15:23:34 +0000] [655249] [INFO] Starting gunicorn 20.1.0
[2021-09-06 15:23:34 +0000] [655249] [ERROR] Retrying in 1 second.
[2021-09-06 15:23:35 +0000] [655249] [ERROR] Retrying in 1 second.
[2021-09-06 15:23:36 +0000] [655249] [ERROR] Retrying in 1 second.
[2021-09-06 15:23:37 +0000] [655249] [ERROR] Retrying in 1 second.
[2021-09-06 15:23:38 +0000] [655249] [ERROR] Retrying in 1 second.
[2021-09-06 15:23:39 +0000] [655249] [ERROR] Can't connect to testpad.sock
[2021-09-06 15:28:44 +0000] [655315] [INFO] Starting gunicorn 20.1.0
[2021-09-06 15:28:44 +0000] [655315] [ERROR] Retrying in 1 second.
[2021-09-06 15:28:45 +0000] [655315] [ERROR] Retrying in 1 second.
[2021-09-06 15:28:46 +0000] [655315] [ERROR] Retrying in 1 second.
[2021-09-06 15:28:47 +0000] [655315] [ERROR] Retrying in 1 second.
[2021-09-06 15:28:48 +0000] [655315] [ERROR] Retrying in 1 second.
[2021-09-06 15:28:49 +0000] [655315] [ERROR] Can't connect to testpad.sock
[2021-09-06 15:31:09 +0000] [655348] [INFO] Starting gunicorn 20.1.0
[2021-09-06 15:31:09 +0000] [655348] [ERROR] Retrying in 1 second.
[2021-09-06 15:31:10 +0000] [655348] [ERROR] Retrying in 1 second.
[2021-09-06 15:31:11 +0000] [655348] [ERROR] Retrying in 1 second.
[2021-09-06 15:31:12 +0000] [655348] [ERROR] Retrying in 1 second.
[2021-09-06 15:31:13 +0000] [655348] [ERROR] Retrying in 1 second.
[2021-09-06 15:31:14 +0000] [655348] [ERROR] Can't connect to testpad.sock
[2021-09-06 15:33:34 +0000] [655387] [INFO] Starting gunicorn 20.1.0
[2021-09-06 15:33:34 +0000] [655387] [ERROR] Retrying in 1 second.
[2021-09-06 15:33:35 +0000] [655387] [ERROR] Retrying in 1 second.
[2021-09-06 15:33:36 +0000] [655387] [ERROR] Retrying in 1 second.
[2021-09-06 15:33:37 +0000] [655387] [ERROR] Retrying in 1 second.
[2021-09-06 15:33:38 +0000] [655387] [ERROR] Retrying in 1 second.
[2021-09-06 15:33:39 +0000] [655387] [ERROR] Can't connect to testpad.sock
[2021-09-06 15:47:54 +0000] [655575] [INFO] Starting gunicorn 20.1.0
[2021-09-06 15:47:54 +0000] [655575] [ERROR] Retrying in 1 second.
[2021-09-06 15:47:55 +0000] [655575] [ERROR] Retrying in 1 second.
[2021-09-06 15:47:56 +0000] [655575] [ERROR] Retrying in 1 second.
[2021-09-06 15:47:57 +0000] [655575] [ERROR] Retrying in 1 second.
[2021-09-06 15:47:58 +0000] [655575] [ERROR] Retrying in 1 second.
[2021-09-06 15:47:59 +0000] [655575] [ERROR] Can't connect to testpad.sock
Not sure why it is not finding flask-login as it is installed under pip and pip3 globally, and is visible when I run pip3 list or pip list.
I assume that once I overcome this hurdle then the testpad.sock file should auto create as it did with my previous app. Most people with this problem I found it was an issue with gunicorn looking at the global environment when people installed dependencies in a virtual environment, which I am not doing in this circumstance.
Any suggestions?
Update
I never did figure out why it could not find the libraries when ran as a service, I even set the PYTHONPATH variable to see if that would help.
What I did do is give up on running as a service and instead just ran the application as a background process on port 8000 and just directed nginx to forward traffic there, and that worked.
Related
I tried to deploy very simple Flask application:
import flask
app = flask.Flask(__name__)
#app.route('/', methods=['GET'])
def home():
return '<h1>Hello!</h1></p>'
app.run()
I followed some official tutorials, created App Service in Azure Portal, deployed app using Local Git solution. Application is deployed, but when I try to browse it, I get:
:( Application Error. If you are the application administrator, you can access the diagnostic resources.
My logs:
2022-09-22T14:24:17.032341362Z
2022-09-22T14:24:17.032431764Z _____
2022-09-22T14:24:17.032440964Z / _ \ __________ _________ ____
2022-09-22T14:24:17.032445564Z / /_\ \___ / | \_ __ \_/ __ \
2022-09-22T14:24:17.032449964Z / | \/ /| | /| | \/\ ___/
2022-09-22T14:24:17.032454364Z \____|__ /_____ \____/ |__| \___ >
2022-09-22T14:24:17.032458965Z \/ \/ \/
2022-09-22T14:24:17.032463265Z
2022-09-22T14:24:17.032467265Z A P P S E R V I C E O N L I N U X
2022-09-22T14:24:17.032471165Z
2022-09-22T14:24:17.032474965Z Documentation: http://aka.ms/webapp-linux
2022-09-22T14:24:17.032489065Z Python 3.9.7
2022-09-22T14:24:17.032493765Z Note: Any data outside '/home' is not persisted
2022-09-22T14:24:17.180055832Z Starting OpenBSD Secure Shell server: sshd.
2022-09-22T14:24:17.215008000Z App Command Line not configured, will attempt auto-detect
2022-09-22T14:24:17.433349825Z Starting periodic command scheduler: cron.
2022-09-22T14:24:17.442192344Z Launching oryx with: create-script -appPath /home/site/wwwroot -output /opt/startup/startup.sh -virtualEnvName antenv -defaultApp /opt/defaultsite
2022-09-22T14:24:17.556237878Z Found build manifest file at '/home/site/wwwroot/oryx-manifest.toml'. Deserializing it...
2022-09-22T14:24:17.562671538Z Output is compressed. Extracting it...
2022-09-22T14:24:17.564241977Z Build Operation ID: |OgP/jQgIHgU=.1da790b7_
2022-09-22T14:24:17.564259877Z Oryx Version: 0.2.20220825.1, Commit: 24032445dbf7bf6ef068688f1b123a7144453b7f, ReleaseTagName: 20220825.1
2022-09-22T14:24:17.565391205Z Extracting '/home/site/wwwroot/output.tar.gz' to directory '/tmp/8da9ca604221f20'...
2022-09-22T14:24:18.725265722Z App path is set to '/tmp/8da9ca604221f20'
2022-09-22T14:24:19.018530608Z Detected an app based on Flask
2022-09-22T14:24:19.405035911Z Generating `gunicorn` command for 'index:app'
2022-09-22T14:24:19.456995902Z Writing output script to '/opt/startup/startup.sh'
2022-09-22T14:24:19.689506779Z Using packages from virtual environment antenv located at /tmp/8da9ca604221f20/antenv.
2022-09-22T14:24:19.690332099Z Updated PYTHONPATH to ':/opt/startup/app_logs:/opt/startup/code_profiler:/tmp/8da9ca604221f20/antenv/lib/python3.9/site-packages'
2022-09-22T14:24:20.556171311Z [2022-09-22 14:24:20 +0000] [77] [INFO] Starting gunicorn 20.1.0
2022-09-22T14:24:20.595370385Z [2022-09-22 14:24:20 +0000] [77] [INFO] Listening at: http://0.0.0.0:8000 (77)
2022-09-22T14:24:20.601700442Z [2022-09-22 14:24:20 +0000] [77] [INFO] Using worker: sync
2022-09-22T14:24:20.610324257Z [2022-09-22 14:24:20 +0000] [80] [INFO] Booting worker with pid: 80
2022-09-22T14:24:21.265168226Z * Serving Flask app 'index'
2022-09-22T14:24:21.266054348Z * Debug mode: on
2022-09-22T14:24:21.300157595Z [31m[1mWARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.[0m
2022-09-22T14:24:21.300272498Z * Running on http://127.0.0.1:5000
2022-09-22T14:24:21.301268023Z [33mPress CTRL+C to quit[0m
2022-09-22T14:24:21.308547204Z * Restarting with stat
2022-09-22T14:24:21.760007120Z [2022-09-22 14:24:21 +0000] [81] [INFO] Starting gunicorn 20.1.0
2022-09-22T14:24:21.772788238Z [2022-09-22 14:24:21 +0000] [81] [ERROR] Connection in use: ('0.0.0.0', 8000)
2022-09-22T14:24:21.773676260Z [2022-09-22 14:24:21 +0000] [81] [ERROR] Retrying in 1 second.
2022-09-22T14:24:22.779581652Z [2022-09-22 14:24:22 +0000] [81] [ERROR] Connection in use: ('0.0.0.0', 8000)
2022-09-22T14:24:22.780698179Z [2022-09-22 14:24:22 +0000] [81] [ERROR] Retrying in 1 second.
2022-09-22T14:24:23.781856453Z [2022-09-22 14:24:23 +0000] [81] [ERROR] Connection in use: ('0.0.0.0', 8000)
2022-09-22T14:24:23.783124685Z [2022-09-22 14:24:23 +0000] [81] [ERROR] Retrying in 1 second.
2022-09-22T14:24:24.787329534Z [2022-09-22 14:24:24 +0000] [81] [ERROR] Connection in use: ('0.0.0.0', 8000)
2022-09-22T14:24:24.788615966Z [2022-09-22 14:24:24 +0000] [81] [ERROR] Retrying in 1 second.
2022-09-22T14:24:25.792686075Z [2022-09-22 14:24:25 +0000] [81] [ERROR] Connection in use: ('0.0.0.0', 8000)
2022-09-22T14:24:25.794038102Z [2022-09-22 14:24:25 +0000] [81] [ERROR] Retrying in 1 second.
2022-09-22T14:24:26.795751866Z [2022-09-22 14:24:26 +0000] [81] [ERROR] Can't connect to ('0.0.0.0', 8000)
2022-09-22T14:24:26.839176431Z [2022-09-22 14:24:26 +0000] [80] [INFO] Worker exiting (pid: 80)
2022-09-22T14:24:26.928820618Z [2022-09-22 14:24:26 +0000] [84] [INFO] Booting worker with pid: 84
It happens all the time, starting, problem with port, restarting, again and again. As I said, I just followed tutorials, didn't change any port or IP address...
I found a solution. My code was development version - in logs was a warning:
WARNING: This is a development server. Do not use it in a production
deployment. Use a production WSGI server instead
I changed code as was answered in Flask at first run: Do not use the development server in a production environment :
import flask
app = flask.Flask(__name__)
#app.route('/', methods=['GET'])
def home():
return '<h1>Hello!</h1></p>'
# debug app:
# app.run()
if __name__ == "__main__":
from waitress import serve
serve(app, host="0.0.0.0", port=8080)
Now application is deployed to Azure and working properly.
when i run sudo systemctl status gunicorn i get this
Active: failed (Result: exit-code) since Mon 2022-01-24 20:00:09 UTC; 25min ago
TriggeredBy: ● gunicorn.socket
Process: 6889 ExecStart=/home/yawar/django_folder/myenv/bin/gunicorn --access-logfile - -- workers 3 --bind unix:/run/gunicorn.sock route_pro.wsgi:application (code=exited, status>
Main PID: 6889 (code=exited, status=4)
Jan 24 20:00:09 XPO gunicorn[6889]: [2022-01-24 20:00:09 +0000] [6889] [INFO] Starting gunicorn 20.1.0
Jan 24 20:00:09 XPO gunicorn[6889]: [2022-01-24 20:00:09 +0000] [6889] [INFO] Listening at: unix:/run/gunicorn.sock (6889)
Jan 24 20:00:09 XPO gunicorn[6889]: [2022-01-24 20:00:09 +0000] [6889] [INFO] Using worker: sync
Jan 24 20:00:09 XPO gunicorn[6891]: [2022-01-24 20:00:09 +0000] [6891] [INFO] Booting worker with pid: 6891
Jan 24 20:00:09 XPO gunicorn[6891]: Failed to find attribute 'application' in 'workers'.
Jan 24 20:00:09 XPO gunicorn[6891]: [2022-01-24 20:00:09 +0000] [6891] [INFO] Worker exiting (pid: 6891)
Jan 24 20:00:09 XPO gunicorn[6889]: [2022-01-24 20:00:09 +0000] [6889] [INFO] Shutting down: Master
Jan 24 20:00:09 XPO gunicorn[6889]: [2022-01-24 20:00:09 +0000] [6889] [INFO] Reason: App failed to load.
Jan 24 20:00:09 XPO systemd[1]: gunicorn.service: Main process exited, code=exited, status=4/NOPERMISSION
Jan 24 20:00:09 XPO systemd[1]: gunicorn.service: Failed with result 'exit-code'.
lines 1-17/17 (END)
what could I be doing wrong , and before that it was throwing a error like no module named workers found so i ran pip3 install workers and now i get the new error, can anyone help?
I'm trying to connect Gunicorn to my Django application, by Docker, to serve it as an HTTP server. The build was successful, with no errors. My problem starts in the race. That's the kind of message I get:
[2020-10-01 12:55:18 +0000] [9] [INFO] Starting gunicorn 20.0.4
[2020-10-01 12:55:18 +0000] [9] [INFO] Listening at: http://0.0.0.0:8010 (9)
[2020-10-01 12:55:18 +0000] [9] [INFO] Using worker: sync
[2020-10-01 12:55:18 +0000] [13] [INFO] Booting worker with pid: 13
[2020-10-01 12:55:18 +0000] [13] [ERROR] Exception in worker process
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
worker.init_process()
File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 119, in init_process
self.load_wsgi()
File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 144, in load_wsgi
self.wsgi = self.app.wsgi()
File "/usr/local/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
self.callable = self.load()
File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 49, in load
return self.load_wsgiapp()
File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 39, in load_wsgiapp
return util.import_app(self.app_uri)
File "/usr/local/lib/python3.7/site-packages/gunicorn/util.py", line 358, in import_app
mod = importlib.import_module(module)
File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'wsgi'
[2020-10-01 12:55:18 +0000] [13] [INFO] Worker exiting (pid: 13)
[2020-10-01 12:55:18 +0000] [9] [INFO] Shutting down: Master
[2020-10-01 12:55:18 +0000] [9] [INFO] Reason: Worker failed to boot.
I know that there are several issues with this same doubt, but I have not been successful in reading them and would like another point of view. The error says that the WSGI module was not found, and I don't know why it can't find it. I believe it is a PATH problem.
This is my tree:
Myproject
├───.pip_cache
├───.vscode
├───backups
├───general_app
│ ├───migrations
│ │ └───__pycache__
│ └───__pycache__
├───headers
├───sistem
│ └───__pycache__
│ └───wsgi.py
│ └───urls.py
│ └───settings.py
│ └───asgi.py
├───sistema.egg-info
└───app
├───migrations
│ └───__pycache__
├───util
└───__pycache__
And this is my command on docker to run gunicorn:
(cd .. && gunicorn wsgi:app --user www-data --bind 0.0.0.0:8010 --workers 3) &
nginx -g "daemon off;"
I just try to do this:
(cd .. && gunicorn sistem.wsgi:app --user www-data --bind 0.0.0.0:8010 --workers 3) &
nginx -g "daemon off;"
But the error change to:
ModuleNotFoundError: No module named 'sistem'
I don't understand what may be going on.
I am trying to read the module hello.py from Dockerfile and seeing the below error:
ModuleNotFoundError: No module named 'hello'
I have tried changing the directory to the current working directory where hello.py is present, but that still doesn't help.
The tree structure as below with hello.py and Dockerfile at the same location:
├── Dockerfile
├── hello.py
├── __init__.py
├── Procfile
├── README.txt
├── requirements.txt
Dockerfile content:
FROM python:3.6.7
RUN pip install gunicorn
EXPOSE 5000
CMD PYTHONPATH=`pwd`/.. gunicorn --bind 0.0.0.0:5000 hello:app
Output when running the container
-----> docker run -p 5000:5000 <image_name>
[2019-06-29 05:03:02 +0000] [7] [INFO] Starting gunicorn 19.9.0
[2019-06-29 05:03:02 +0000] [7] [INFO] Listening at: http://0.0.0.0:5000 (7)
[2019-06-29 05:03:02 +0000] [7] [INFO] Using worker: sync
[2019-06-29 05:03:02 +0000] [10] [INFO] Booting worker with pid: 10
[2019-06-29 05:03:02 +0000] [10] [ERROR] Exception in worker process
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
worker.init_process()
File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 129, in init_process
self.load_wsgi()
File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
self.wsgi = self.app.wsgi()
File "/usr/local/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
self.callable = self.load()
File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
return self.load_wsgiapp()
File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
return util.import_app(self.app_uri)
File "/usr/local/lib/python3.6/site-packages/gunicorn/util.py", line 350, in import_app
__import__(module)
ModuleNotFoundError: No module named 'hello'
[2019-06-29 05:03:02 +0000] [10] [INFO] Worker exiting (pid: 10)
[2019-06-29 05:03:02 +0000] [7] [INFO] Shutting down: Master
[2019-06-29 05:03:02 +0000] [7] [INFO] Reason: Worker failed to boot.
What am i missing the Dockerfile?
you are missing the COPY line:
FROM python:3.6.7
RUN pip install gunicorn
COPY . . #copy everything in the context to the current dir in the container
EXPOSE 5000
CMD PYTHONPATH=`pwd`/.. gunicorn --bind 0.0.0.0:5000 hello:app
otherwise the container would not include your files
I am trying to serve a simple API by following this digitalocean tutorial.
For testing I was earlier serving the API through gunicorn by doing a
$ gunicorn --bind 0.0.0.0:5000 trumporate.wsgi:app
And curling the API endpoint works inside the ec2 box
$ curl -X GET http://0.0.0.0:5000/api/v1/trump/rant/
{
"foo": "bar"
}
Now I shifted this gunicorn process to run at startup by making a systemd service
# /etc/systemd/system/trumporate.service
[Unit]
Description=Gunicorn instance for trumporate
After=network.target
[Service]
User=ubuntu
Group=www-data
WorkingDirectory=/var/opt/trumporate
ExecStart=/usr/local/bin/gunicorn --workers 3 --bind unix:trumporate.sock -m 007 --access-logfile /var/log/trumporate/gunicorn-access.log --error-logfile /var/log/trumporate/gunicorn-error.log trumporate.wsgi:app
[Install]
WantedBy=multi-user.target
I have created the files
/var/log/trumporate/gunicorn-error.log
/var/log/trumporate/gunicorn-access.log
and changed the ownership and group to ubuntu
After enabling the service and rebooting, I checked the status
$ sudo systemctl status trumporate.service
● trumporate.service - Gunicorn instance for trumporate
Loaded: loaded (/etc/systemd/system/trumporate.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2017-05-03 06:30:26 UTC; 1h 2min ago
Main PID: 1122 (gunicorn)
Tasks: 4
Memory: 92.2M
CPU: 1.390s
CGroup: /system.slice/trumporate.service
├─1122 /usr/bin/python3 /usr/local/bin/gunicorn --workers 3 --bind unix:trumporate.sock -m 007 --access-logfile /var/log/trumporate/gunicorn-access.log --error-logfile /var/log/trumporate/gunic
├─1264 /usr/bin/python3 /usr/local/bin/gunicorn --workers 3 --bind unix:trumporate.sock -m 007 --access-logfile /var/log/trumporate/gunicorn-access.log --error-logfile /var/log/trumporate/gunic
├─1266 /usr/bin/python3 /usr/local/bin/gunicorn --workers 3 --bind unix:trumporate.sock -m 007 --access-logfile /var/log/trumporate/gunicorn-access.log --error-logfile /var/log/trumporate/gunic
└─1267 /usr/bin/python3 /usr/local/bin/gunicorn --workers 3 --bind unix:trumporate.sock -m 007 --access-logfile /var/log/trumporate/gunicorn-access.log --error-logfile /var/log/trumporate/gunic
May 03 06:30:26 ip-172-31-25-173 systemd[1]: Started Gunicorn instance for trumporate.
Following the DO tutorial, I tried configuring nginx to proxy incoming requests on port 80
$ cat /etc/nginx/sites-available/trumporate
server {
listen 80;
server_name private_ip_address;
location / {
include proxy_params;
proxy_pass http://unix:/var/opt/trumporate/trumporate.sock;
}
}
And then did a
$ ln -s /etc/nginx/sites-available/trumporate /etc/nginx/sites-enabled
$ sudo nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
Now if I try to do GET request to the API endpoint from outside the ec2 box
$ curl -X GET http://public_ip/api/v1/trump/rant
<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.10.0 (Ubuntu)</center>
</body>
</html>
Same case when I try to do it from inside the ec2 container too
$ curl -X GET http://localhost:80/api/v1/trump/rant/
<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.10.0 (Ubuntu)</center>
</body>
</html>
log files
# /var/log/nginx/access.log
dev_box_ip - - [03/May/2017:05:50:45 +0000] "GET /api/v1/trump/rant/ HTTP/1.1" 404 580 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36"
127.0.0.1 - - [03/May/2017:06:13:26 +0000] "GET /api/v1/trump/rant/ HTTP/1.1" 404 178 "-" "curl/7.47.0"
dev_box_ip - - [03/May/2017:07:42:42 +0000] "GET / HTTP/1.1" 304 0 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36"
/var/log/nginx$ cat error.log
/var/log/nginx$
/var/log/trumporate$ cat gunicorn-access.log
/var/log/trumporate$
$ cat gunicorn-error.log
[2017-05-03 06:28:41 +0000] [1884] [INFO] Starting gunicorn 19.7.1
[2017-05-03 06:28:41 +0000] [1884] [INFO] Listening at: unix:trumporate.sock (1884)
[2017-05-03 06:28:41 +0000] [1884] [INFO] Using worker: sync
[2017-05-03 06:28:41 +0000] [1889] [INFO] Booting worker with pid: 1889
[2017-05-03 06:28:41 +0000] [1890] [INFO] Booting worker with pid: 1890
[2017-05-03 06:28:41 +0000] [1891] [INFO] Booting worker with pid: 1891
[2017-05-03 06:29:48 +0000] [1884] [INFO] Handling signal: term
[2017-05-03 06:29:48 +0000] [1889] [INFO] Worker exiting (pid: 1889)
[2017-05-03 06:29:48 +0000] [1890] [INFO] Worker exiting (pid: 1890)
[2017-05-03 06:29:48 +0000] [1891] [INFO] Worker exiting (pid: 1891)
[2017-05-03 06:29:49 +0000] [1884] [INFO] Shutting down: Master
[2017-05-03 06:30:27 +0000] [1122] [INFO] Starting gunicorn 19.7.1
[2017-05-03 06:30:27 +0000] [1122] [INFO] Listening at: unix:trumporate.sock (1122)
[2017-05-03 06:30:27 +0000] [1122] [INFO] Using worker: sync
[2017-05-03 06:30:27 +0000] [1264] [INFO] Booting worker with pid: 1264
[2017-05-03 06:30:27 +0000] [1266] [INFO] Booting worker with pid: 1266
[2017-05-03 06:30:28 +0000] [1267] [INFO] Booting worker with pid: 1267
/var/log/trumporate$
EDIT
Relevant part of the flask app
#app.route('/api/v1/trump/rant/')
def return_rant():
foo = # logic
return jsonify(rant=foo)
Did you do nginx -s reload && systemctl restart nginx?
Another thing which you could try is to make the bindings on a http port instead of a socket:
--bind 127.0.0.1:6767 #in systemd config
and change nginx config as follows:
location / {
include proxy_params;
proxy_redirect off;
proxy_pass http://127.0.0.1:6767;
}
Also why do you have private_ip in nginx config?
server_name private_ip_address;
Change that to
server_name "_";
# OR
server_name PUBLIC_IP;
and remove all default configs from /etc/nginx/site-enabled
1) use of server_name private_ip_address;?
Nginx uses the server_name to check with the host header of the incoming request, and that isn't the private address. (You usually access using either a domain name or the public address in the URL bar)
2) I deleted /etc/nginx/site-enabled/default dir to make things to get to working.
If your server_name is not set correctly, nginx processes the request using the default file or the server block containing default_server. Thus I asked you to delete that file just in case there was an issue with your server name ^_^
Also, what difference would it make to the performance of the API if I am binding it to a port instead of the socket file as suggested by the blog post?
This would typically be premature optimization, any difference you get will purely be within a margin of error compared to the bottlenecks caused by flask/python and especially database connections. Though please take this with a grain of salt as I do not have any reliable source to quote this on.