[Flask] errors w/ flask deployment with emperor

[tigernassau]

thks
okay we can try "module" - hmm, will app.py do ?  or do we need to use 
__init__.py ?  and spec python3 ? right now our __init__.py is empty

is it a good idea to run emperor as root ?  run anything as root ?  when 
we ran a test, it gave us a warning msg about running as root




On 10/20/2015 01:25 PM, Jeff Widman wrote:
> A few quick things I noticed:
>  - no need to set Master = True in your Emperor because functionally 
> the Emperor IS the master process. I submitted a pull request to the 
> uWSGI docs clarifying this last week.
>  - Emperor is generally run as root, with the vassals specifying their 
> UID/GID. That lets the Emperor respawn vassals for various 
> UID/GID's--for security, it will drop the vassal's privileges before 
> actually serving requests
>
> I noticed you're trying to call Flask using the 'file' + 'callable' 
> params. Typically most examples I've seen just use 'module' + 
> 'callable'. I haven't looked into the 'file' param, it may do the same 
> thing. The most important part is making sure you're calling whatever 
> it is that starts your app... sometimes people subclass app in a 
> different file, particularly if they're using the app factory pattern 
> for quickly switching between dev and prod configuration.
>
> To debug, I'd first try running the Flask development webserver, and 
> make sure it loads. That should allow you to trace whether you should 
> be calling 'app' or a different command. Then try the vassal by itself 
> using the shell and see if it loads, then if that works then add the 
> emperor, then if that all works, then go to daemonizing it using SystemD.
>
> Cheers,
> Jeff
>
> ᐧ
>
> On Tue, Oct 20, 2015 at 11:34 AM, tigernassau <tigernassau at gmail.com 
> <mailto:tigernassau at gmail.com>> wrote:
>
>     okay, we took another try at getting flask to deploy using emperor
>     server: debian 8, using python3
>
>     server runs bottle apps fine
>
>     here is the config we tried - get error:  "curse the vassal...
>     /etc/uwsgi/vassals/testapp.ini
>     couldn't find any more details on what is wrong
>
>     btw had to run uwsgi emperor as sudo since the systemd service
>     failed with log file permission error
>
>     ---- w/ flask ---
>     # sudo apt-get install python3-dev
>     # sudo apt-get install python3-pip
>     # sudo pip3 install flask
>     # sudo pip3 install py-bcrypt
>     # sudo pip3 install psycopg2
>     # sudo pip3 install uwsgi
>     # sudo apt-get install uwsgi-plugin-python
>
>     sudo vim /etc/nginx/nginx.conf
>       user nginx;
>       worker processes 5
>       .....
>       http {
>          ...
>           server {
>               listen 80;
>               server_name testapp.com <http://testapp.com>
>     www.testapp.com <http://www.testapp.com>;
>               root /home/testapp;
>               charset utf-8;
>               location /static {
>                   alias /home/testapp/static;
>               }
>               location = /favico.ico  {
>                 root /home/testapp/static/images/favico.ico;
>               }
>               location / {
>                   try_files $uri @wsgi;
>               }
>               location @wsgi {
>                   include /etc/nginx/uwsgi_params;
>                   uwsgi_pass unix:/home/testapp/testapp.sock;
>               }
>           }
>       }  #http
>     sudo service nginx configtest
>     sudo service nginx start (stop reload)
>
>     ---- uwsgi-emperor ---
>     sudo vim /etc/uwsgi/emperor.ini
>     [uwsgi]
>     emperor = /etc/uwsgi/vassals
>     master = true
>     #plugins = python2
>     #uid = www-data
>     #gid = www-data
>
>     --- uwsgi vassals ---
>     sudo vim /etc/uwsgi/vassals/testapp.ini
>       [uwsgi]
>       chdir = /home/testapp
>       socket = /home/testapp/testapp.sock
>       chmod-socket = 664
>       file = app.py
>       callable = app
>       processes = 4
>       stats = 127.0.0.1:9191 <http://127.0.0.1:9191>
>       max-requests = 5000
>       #master = true
>       #plugins = python
>       #uid = www-data
>       #gid = www-data
>       vacuum = true
>       thunder-lock = true
>       enable-threads = true
>       logto = /var/log/uwsgi/testapp.log
>       # die-on-term = true
>
>     ---- systemd service emperor ---
>     sudo vim /etc/systemd/system/testapp.service
>       [Unit]
>           Description=uwsgi emperor for testapp
>           After=network.target
>       [Service]
>           User=www-data
>           Group=www-data
>           WorkingDirectory=/home/testapp
>           ExecStart=uwsgi --emperor /etc/uwsgi/vassals/testapp.ini --logto
>               /var/log/uwsgi/testapp.log
>       #[Install]
>       #WantedBy=multi-user.target
>
>
>
>
>
>
>     -- 
>     Tiger Nassau, Inc.
>     www.tigernassau.com <http://www.tigernassau.com>
>
>     _______________________________________________
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>
>
>
>
> -- 
> *
> Jeff Widman*
> jeffwidman.com <http://www.jeffwidman.com/> | 740-WIDMAN-J (943-6265)
> <><


-- 
Tiger Nassau, Inc.
www.tigernassau.com

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