uWSGI, Nginx, Flask app service keeps failing - nginx

Question

Going to my app produces a 502 gateway error. Found out that it was because my how_lit.service is failing. But I am having trouble finding out why.
Tried editing the application and the ini document. Cannot figure out whats wrong.
The Nginx and uWSGI services are up and running fine.
Service Status:
lit#digitalocean:~/howlit$ sudo service how_lit status
[sudo] password for lit:
● how_lit.service - uWSGI instance to serve how lit rest api
Loaded: loaded (/etc/systemd/system/how_lit.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2016-08-04 00:30:44 EDT; 5 days ago
Process: 14294 ExecStart=/home/lit/howlit/env/bin/uwsgi --ini /home/lit/howlit/howlit.ini (code=exited, status=1/FAILURE)
Main PID: 14294 (code=exited, status=1/FAILURE)
Aug 04 00:30:44 digitalocean systemd[1]: Started uWSGI instance to serve how lit rest api.
Aug 04 00:30:44 digitalocean uwsgi[14294]: [uWSGI] getting INI configuration from /home/lit/howlit/howlit.ini
Aug 04 00:30:44 digitalocean systemd[1]: how_lit.service: Main process exited, code=exited, status=1/FAILURE
Aug 04 00:30:44 digitalocean systemd[1]: how_lit.service: Unit entered failed state.
Aug 04 00:30:44 digitalocean systemd[1]: how_lit.service: Failed with result 'exit-code'.
Directory and Permissions:
lit#digitalocean:~/howlit$ ls -l .
total 16
drwx---r-x 6 lit www-data 4096 Jul 29 11:47 env
-rwx---r-x 1 lit www-data 202 Aug 3 23:29 howlit.ini
-rwx---r-x 1 lit www-data 1203 Aug 3 23:01 how_lit_restapi.py
-rwxr-xr-x 1 lit www-data 72 Aug 3 23:27 wsgi.py
/etc/systemd/system/how_lit.service:
lit#digitalocean:~/howlit$ cat /etc/systemd/system/how_lit.service
[Unit]
Description=uWSGI instance to serve how lit rest api
After=network.target
[Service]
User=lit
Group=www-data
WorkingDirectory=/home/lit/howlit/
Environment="PATH=/home/lit/howlit/env/bin"
ExecStart=/home/lit/howlit/env/bin/uwsgi --ini /home/lit/howlit/howlit.ini
[Install]
WantedBy=multi-user.target
howlit.ini file:
lit#digitalocean:~/howlit$ cat howlit.ini
[uwsgi]
module = wsgi:app
uid = lit
gid = www-data
master = true
processes = 5
socket = how_lit_restapi.sock
chmod-sock = 666
vacum = true
die-on-term = true
gto = /var/log/uwsgi/%n.log
Tried running it by hand:
lit#digitalocean:~/howlit$ /home/lit/howlit/env/bin/uwsgi --ini /home/lit/howlit/howlit.ini
[uWSGI] getting INI configuration from /home/lit/howlit/howlit.ini
*** Starting uWSGI 2.0.13.1 (64bit) on [Tue Aug 9 18:28:25 2016] ***
compiled with version: 5.4.0 20160609 on 29 July 2016 11:48:08
os: Linux-4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016
nodename: digitalocean
machine: x86_64
clock source: unix
detected number of CPU cores: 1
current working directory: /home/lit/howlit
detected binary path: /home/lit/howlit/env/bin/uwsgi
!!! no internal routing support, rebuild with pcre support !!!
your processes number limit is 1896
your memory page size is 4096 bytes
detected max file descriptor number: 1024
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
bind(): Permission denied [core/socket.c line 230]
permission error again?
SOLVED IT: By sending my socket into tmp, but still getting bad gateway error when I navigate to my site :(

Answer 1

Solved my own problem.
First I checked my services.
sudo service nginx status
sudo service uwsgi status
sudo service how_lit status
then I saw them all running and up but was still getting the bad gateway error. Well after checking the logs had no errors. I had to assume my configs.
Then I realized my mistake....I never restarted all of it, just certain parts at certain times. So I restarted every single one as such:
sudo service nginx restart
sudo service uwsgi restart
sudo service how_lit restart
now it works.
About the permission issue I tried it by putting the socket into the /tmp directory that way www-data group users can access it as well as root. I learned that you need to be able to create the socket and allow access to the system for it.
I moved it out of tmp btw later for production as I was told that was not best practice.