Trouble Accessing WebUI (Docker/OCI Container)

[Shadow8472]

I am setting up MineOS for a family server within my homelab. Here is what I know so far:

Probably important

• I am able to ping into the container from a command line.
• I am using the image at https://hub.docker.com/r/hexparrot/mineos/tags.
• Server: Rocky Linux 9 (I saw a post about a similar issue on CentOS, but the fix was to install Python)
• Client: PopOS Linux (Debian/Ubuntu base)
• I use Podman for my OCI containers.

Probably less important/irrelevant

• I already know I'll need to address the Java 21 requirement for Minecraft 21+. I plan on mounting GraalVM over the container's Java path.
• MineOS is behind Caddy (reverse proxy with HTTPS protection built in, also running atop Podman). mineos and minecraft subdomains are forwarded to ports 8443 and 25565, respectively. My CA certificates are imported into both Linux and Firefox.
• Firefox immediately returns Error code: 502 Bad Gateway on a profile that will hang for a minute when pointed at an empty
• curl <https://mineos.<server_hostname>.<my_domain>.lan> returns nothing.
• Neither MineOS nor any servers I host will be available outside our LAN, so I am not worried about locking it down harder than putting it behind Caddy for now.

Edit 8-10-25
Output of top:

top - 20:58:18 up 3 days, 16:58,  0 users,  load average: 0.12, 0.10, 0.04
Tasks:   8 total,   1 running,   7 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.1 us,  0.1 sy,  0.0 ni, 99.6 id,  0.1 wa,  0.1 hi,  0.1 si,  0.0 st
MiB Mem :  13625.4 total,  11784.6 free,    955.8 used,    885.0 buff/cache
MiB Swap:   7008.0 total,   7008.0 free,      0.0 used.  12364.1 avail Mem 

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                           
      1 root      20   0   28496  23696   9088 S   0.0   0.2   0:20.34 supervisord                                       
     45 root      20   0  772360  56608  31744 S   0.0   0.4   2:18.63 node                                              
     57 root      20   0    2616   1536   1536 S   0.0   0.0   0:00.01 sh                                                
     63 root      20   0    4248   3456   2944 S   0.0   0.0   0:00.00 bash                                              
     74 root      20   0    2616   1536   1536 S   0.0   0.0   0:00.00 sh                                                
     76 root      20   0    2616   1536   1536 S   0.0   0.0   0:00.00 sh                                                
     78 root      20   0    4248   3456   2944 S   0.0   0.0   0:00.00 bash                                              
     85 root      20   0    6088   3200   2816 R   0.0   0.0   0:00.00 top                                               

[Shadow8472]

I managed to get into MineOS on my own by building the Dockerfile with Podman.

Word of advice to future adventurers: I spent a day or few throwing my Linux knowledge at diagnosing a container I knew was out of date. It took me 10-20 productive minutes studying up on Dockerfiles to complete my knowledge enough to build the one in the code. It needs maintenance (Ubuntu and Node updates, for starters), but I got it working.

PS: the top output wasn't useful. If the webUI was running, it would have been within Node. Here is a blog post I found useful: https://deeplearning.lipingyang.org/2017/08/11/list-node-process-and-kill-specific-process-if-needed/

PPS: I'm pretty sure MineOS was running, but something was interfering. Doubling up on HTTPS encryption, perhaps (container + Caddy)?