Internal Server Error The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

[Raju]

❯ docker run -d --restart=always --name nginxui -p 3333:8080 -v /etc/nginx:/nginx schenkd/nginx-ui:latest

❯ docker logs nginxui
*** Starting uWSGI 2.0.18 (64bit) on [Tue Jun 23 01:55:51 2020] ***
compiled with version: 9.3.0 on 21 June 2020 09:42:26
os: Linux-5.4.0-37-generic #41-Ubuntu SMP Wed Jun 3 18:57:02 UTC 2020
nodename: f5f7495cb4e6
machine: x86_64
clock source: unix
pcre jit disabled
detected number of CPU cores: 8
current working directory: /webapp
detected binary path: /usr/local/bin/uwsgi
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
*** WARNING: you are running uWSGI without its master process manager ***
your memory page size is 4096 bytes
detected max file descriptor number: 1048576
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
uWSGI http bound on 0.0.0.0:8080 fd 4
spawned uWSGI http 1 (pid: 6)
uwsgi socket 0 bound to TCP address 127.0.0.1:33773 (port auto-assigned) fd 3
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
Python version: 3.7.7 (default, Jun 3 2020, 19:58:28) [GCC 9.3.0]
Python main interpreter initialized at 0x55f7fbfe7ce0
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
python threads support enabled
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 145984 bytes (142 KB) for 8 cores
*** Operational MODE: threaded ***
WSGI app 0 (mountpoint='') ready in 0 seconds on interpreter 0x55f7fbfe7ce0 pid: 1 (default app)
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI worker 1 (and the only) (pid: 1, cores: 8)
[2020-06-23 01:56:30,544] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File "./app/ui/views.py", line 15, in index
config = [f for f in os.listdir(nginx_path) if os.path.isfile(os.path.join(nginx_path, f))]
FileNotFoundError: [Errno 2] No such file or directory: '/etc/nginx'
[pid: 1|app: 0|req: 1/1] 172.17.0.1 () {48 vars in 914 bytes} [Tue Jun 23 01:56:30 2020] GET / => generated 290 bytes in 3 msecs (HTTP/1.1 500) 2 headers in 99 bytes (1 switches on core 1)
[pid: 1|app: 0|req: 2/2] 172.17.0.1 () {46 vars in 832 bytes} [Tue Jun 23 01:56:30 2020] GET /favicon.ico => generated 232 bytes in 0 msecs (HTTP/1.1 404) 2 headers in 87 bytes (1 switches on core 1)

❯ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f5f7495cb4e6 schenkd/nginx-ui:latest "uwsgi --http 0.0.0.…" 32 seconds ago Up 30 seconds 0.0.0.0:3333->8080/tcp nginxui

unable to run on http://localhost:3333/

Internal Server Error
The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

[debuggerboy]

Raju,

You need to have a fully working nginx install on your host.
If yes, then your "/etc/nginx" should have the "nginx.conf" file and "conf.d" directory.

Then when you launch "nginx-ui" docker container, you need to add your local /etc/nginx as a volume inside the "nginx-ui" docker container mapped to /etc/nginx such that the Python Flask application can read it's configuration and display the website.

1. Make sure that you local nginx is setup properly and your /etc/nginx directory is populated.
2. When you launch nginx-ui container mount your local nginx config directory into the container. use "-v /etc/nginx:/etc/nginx"

Other option

Launch 2 containers "nginx-ui" and "nginx" using "docker-compose.yml" and the use "/etc/nginx" as a shared volume on both "nginx-ui" and "nginx".

[LucaNerlich]

What @debuggerboy mentioned, using the correct volumemapping works:

docker run -d --restart=always --name nginxui -v /etc/nginx:/etc/nginx -p 7777:8080 schenkd/nginx-ui:latest

The docs are "wrong".

[Raju]

now i got it, as i'm new to docker so a bit confusing with all those options and stuffs but now i can confirm its working on localhost:7777

I'll go head and close the issue.

[amitsax]

Adding to this issue - When used with LinuxServer.io image of swag.

Map the swag/nginx directory to /etc/nginx of docker image of nginx-ui.
you will get the same error reported htere, because conf.d directory is not available.
Workaround:
create a symbolic link conf.d directory linked to proxy-confs directory. that
in swag/nginx directory execute: ln -s proxy-confs conf.d

restart container for nginx-ui. now this error would be resolved.