Related to the Alex post I think it is incorrect to define the domain name in a service docker container for the application or in the UNA app server. the application must run in localhost or any ip address and any port depend of the setup, the domain must be defined only in the reverse proxy server or a web server level, so you can run multiple containers with the app in a swarm or a cluster with more many containers or on several servers in bachend, each service can be scalable and extended in the cloud without problems. Otherwise, a social network cannot be built in a single server, this is just an illusion

"Also, this recent thread maybe useful too https://unacms.com/d/image-transcoder."

PAGE NOT FOUND

i have instaled version 14.0.0-B1 in hostname localhost:8888

.env variable:

UNA_HTTP_HOST=localhost:8888
UNA_DB_HOST=host.docker.internal
UNA_AUTO_HOSTNAME=1

Host tools:

Host Tools
Requirements
PHP:
version = 8.1.28 - OK
allow_url_fopen = On - OK
allow_url_include = Off - OK
magic_quotes_gpc = Off - OK
memory_limit = 128 MB - OK
post_max_size = 1 GB - OK
upload_max_filesize = 1 GB - OK
register_globals = Off - OK
safe_mode = Off - OK
disable_functions - OK
php module: curl = curl - OK
php module: gd = gd - OK
php module: mbstring = mbstring - OK
php module: json = json - OK
php module: fileinfo = fileinfo - OK
php module: zip = zip - OK
php module: openssl = openssl - OK
php module: exif = exif - OK
MySQL:
version = 11.3.2 - OK
Web-server: nginx/1.25.5
rewrite_module - UNDEFINED
OS:
Linux 4a2ec9e2b918 6.2.0-26-generic #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Jul 13 16:27:29 UTC 2 x86_64
Hardware:
Hardware requirements can not be determined automatically - manual server audit may be required.
Site setup
UNA version = 14.0.0-DEV5 - OK
Files and folders permissions - please click here to find out if permissions are correct.
ffmpeg -
ffmpeg version 4.4-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

if you don't know if output is correct then manual server audit may be required.
Mail sending - click here to send test email
Cron jobs -
no crontab for www-data

if you are unsure if output is correct then manual server audit may be required
Last cron jobs execution - None
Site optimization
PHP:
PHP accelerator = ZendOPcache - OK
PHP setup = fpm-fcgi - OK
MySQL:
key_buffer_size = 128 MB - OK
max_heap_table_size = 16 MB - OK
tmp_table_size = 16 MB - OK
thread_cache_size = 151 - OK
Web-server:
User-side caching for static content - click here to check it in Google Page Speed
If it is not enabled then please consider implement this optimization, since it improve perceived site speed and save the bandwidth.
To apply this optimization you need to have expires_module - UNDEFINED
Server-side content compression - can be checked manually or in "Page Speed" tool build-in into browser.
If it is not enabled then please consider implement this optimization, since it improve perceived site speed and save the bandwidth.
To apply this optimization you need to have deflate_module - UNDEFINED
UNA:
DB cache = On (File based cache engine) - OK
Pages cache = On (File based cache engine) - OK
Page blocks cache = On (File based cache engine) - OK
Templates Cache = On (FileHtml based cache engine) - OK
CSS files cache = On - OK
JS files cache = On - OK
Compression for CSS/JS cache = On - OK

the problem repeats itself, the images are not processed.

it seems that the cron service is not functional in docker container

folder permision setup:

sudo chmod 777 ./plugins/ffmpeg/ffmpeg.exe
sudo chmod 777 ./inc
sudo chmod 777 ./cache
sudo chmod 777 ./cache_public
sudo chmod 777 ./logs
sudo chmod 777 ./tmp
sudo chmod 777 ./storage
sudo chmod 777 ./periodic/cron.php
also
sudo chmod +x plugins/ffmpeg/ffmpeg.exe
sudo chmod +x periodic/cron.php