I have an application built on CherryPy. I've been using the CherryPy built-in HTTP server but now want to move to uWSGI (and nginx).
On my workstation this works fine and the change was simple enough to make.
However on my test server I get the following error.
File "./validator/dbtools.py", line 3, in <module>
import psycopg2
File "/home/apiuser/API25/env/lib64/python3.5/site-packages/psycopg2/__init__.py", line 50, in <module>
from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
ImportError: /home/apiuser/API25/env/lib64/python3.5/site-packages/psycopg2/_psycopg.cpython-35m-x86_64-linux-gnu.so: undefined symbol: lo_truncate64
unable to load app 0 (mountpoint='') (callable not found or import error)
The test server is different (CentOS 7 vs an Ubuntu based distribution on my workstation). When I google the error I see reports from similar errors but in different libraries. The psycopg library didn't change, in fact the two versions of the app (CherryPy / uWSGI version) runs from the same VirtualEnv. Running it as a CherryPy service works still fine.
I'm new to all of this so any help will be appreciated!
EDIT -- In response to the Question by Piotr: I star the app with a small bash script like this:
#!/bin/bash
. env/bin/activate
uwsgi --socket 127.0.0.1:8030 --protocol=http --wsgi-file wsgi.py --callable wsgiapp
Two other things I have picked up:
1. I set up a new test server running CentOs. On this new server the uwsgi app starts without the undefined symbol error. I would still like to know what causes it as a matter of learning about this.
2. Some of the API endpoints include some functions launched into background threads. Those work fine when running the app behind CherryPy's default server. When running the app using uWSGI the background threads doesn't execute but appears to get queued up. When I terminate the app (Control-C on the console) those threads suddenly run and those tasks (particularly push notifications) will go through.
Related
Maybe someone could help, why having this configuration:
pm2 start npm --name simple-app --log-date-format "YYYY-DD-MM HH:mm:ss.SSS" -- start
I see only date of logs? I can't see exact time:
Binding this server to an open connection can result in compromising your application or
computer. Using a different host than the one passed to the "--host" flag might result in
websocket connection issues. You might need to use "--disableHostCheck" if that's the
case.2022-22-11:
2022-22-11: Warning: Running a server with --disable-host-check is a security risk. See https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a for more information.2022-22-11:
2022-22-11:
Compiling #angular/core : es2015 as esm2015
version of pm2 - 5.2.2, but I noticed the same on older version in my case.
When I run this script "python3 script.py" everything is alright.
(I tried to run the script as a root, and other user too)
import music21
import os
# "qt.qpa.xcb: could not connect to display"
# "qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found."
os.putenv("QT_QPA_PLATFORM", "offscreen") #handle error above in my case
us = music21.environment.UserSettings()
us['musescoreDirectPNGPath'] = '/usr/bin/musescore3'
score = music21.converter.parse("myfile.musicxml")
score.write('musicxml.pdf', fp='song.pdf')
But when my django backend has to execute this code as a function to respond API call, its not working. I got:
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-myusername'
This plugin does not support propagateSizeHints()
And if I remove part with "QT_QPA_PLATFORM", I got "qt.qpa.xcb" error.
I have not idea what to do.
I also tried to add following line in my gunicorn setup script but nothing changed.
export QT_QPA_PLATFORM=offscreen
Any ideas how to fix it ? What can be wrong ?
Server OS: Ubuntu 20.04
You probably need to also set XDG_RUNTIME_DIR. See https://github.com/cuthbertLab/music21/issues/260#issuecomment-834489173
Hello I'm trying to do web scraping with the python module requests-html to handle dynamic content on the page https://www.monster.com/jobs/search?q=Software+Engineer&where=. My code is:
from requests_html import HTMLSession
url = 'https://www.monster.com/jobs/search?q=Software+Engineer&where='
session = HTMLSession()
response = session.get(url)
response.html.render()
but when I run response.html.render() I get this error
OSError: [WinError 14001] The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail
The first time I ran render() I got
[W:pyppeteer.chromium_downloader] start chromium download.
Download may take a few minutes.
[W:pyppeteer.chromium_downloader]
chromium download done.
[W:pyppeteer.chromium_downloader] chromium extracted to: C:\Users\user\AppData\Local\pyppeteer\pyppeteer\local-chromium\588429
however the file path doesn't exist but pyppeteer is actually an installed package (pyppeteer==0.2.5). Does anyone have an idea what is going on?
You're having this issue because chromium setup failed.
You can either try to reinstall request_html or what I did was switching from the python from the Windows store to the download from the python website and then installing request_html again.
After having everything setup correctly with the downloaded python I switched back to python 3.9 from the store and everything is still working.
I am trying to run the example grakn migration "phone_calls" (using python and JSON files).
Before reaching there, I need to load the schema, but I am having trouble with getting the schema loaded, as shown here: https://dev.grakn.ai/docs/examples/phone-calls-schema
System:
-Mac OS 10.15
-grakn-core 1.8.3
-python 3.7.3
The grakn server is started. I checked and the 48555 TCP port is open, so I don't think there is any firewall issue. The schema file is in the same folder (phone_calls) as where the json data files is, for the next step. I am using a virtual environment. The error is below:
(project1_env) (base) tiffanytoor1#MacBook-Pro-2 onco % grakn server start
Storage is already running
Grakn Core Server is already running
(project1_env) (base) tiffanytoor1#MacBook-Pro-2 onco % grakn console --keyspace phone_calls --file phone_calls/schema.gql
Unable to create connection to Grakn instance at localhost:48555
Cause: io.grpc.StatusRuntimeException
UNKNOWN: Could not reach any contact point, make sure you've provided valid addresses (showing first 1, use getErrors() for more: Node(endPoint=/127.0.0.1:9042, hostId=null, hashCode=5f59fd46): com.datastax.oss.driver.api.core.connection.ConnectionInitException: [JanusGraph Session|control|connecting...] init query OPTIONS: error writing ). Please check server logs for the stack trace.
I would appreciate any help! Thanks!
Nevermind -- I found the solution, in case any one else runs into a similar problem. The server configuration file needs to be edited: point the data directory to your project data files (here: the phone_calls data files) & change the server IP address to your own.
I've built a simple test app with clutter: A stage with two ClutterText actors to display two words. It works OK when I run it from within gnome but running it from the tty (not gnome-terminal or xterm) with xinit my_app_binary I get an error:
failed to create drawable
Unable to initialize Clutter: Unable to select the newly created GLX context
Window manager error: Unable to initialize Clutter
If I run xinit gnome-terminal from the same tty everything works, gnome-terminal shows up in a black screen. That's the same I want to do with my app.
Is there anything I can do to overcome this error?
All the above are tested in Linux Mint 12. After normal boot I switch to a tty (ALT-F1) and stop lightdm (sudo /etc/init.d/lightdm stop).
Thanks!
EDIT: running as root everything works, so the question is: how to run it as a regular user?
Be sure to set the DISPLAY-var - add it in front of your command
DISPLAY=:0.0 /path/to/myapp
Sometimes this is an access-rights problem - the app should be started with the user who started the X-server
su user-started-x -c 'DISPLAY=:0.0 /path/to/myapp'