Carla-client error while trying to connect to server running in local docker container

[dbersan]

Doing:

sudo nvidia-docker run -it --rm carlasim/carla:0.9.10 /bin/bash

and then:

SDL_VIDEODRIVER=offscreen ./CarlaUE4.sh -carla-world-port=2000 -opengl

I get these results:

4.24.3-0+++UE4+Release-4.24 518 0
Disabling core dumps.
sh: 1: xdg-user-dir: not found
ALSA lib confmisc.c:767:(parse_card) cannot find card '0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default
ALSA lib confmisc.c:767:(parse_card) cannot find card '0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default

Do these errors mean anything? The process is still running. When checking nvidia-smi it appears carla is using the graphics card:

+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A    195271      G   /usr/lib/xorg/Xorg                217MiB |
|    0   N/A  N/A    195623      G   /usr/bin/gnome-shell               51MiB |
|    0   N/A  N/A    196004      G   ...AAAAAAAAA= --shared-files       85MiB |
|    0   N/A  N/A    197882      G   ...AAAAAAAAA= --shared-files       48MiB |
|    0   N/A  N/A    215670    C+G   ...x/CarlaUE4-Linux-Shipping      993MiB |
+-----------------------------------------------------------------------------+

However, I am unable to connect to the carla-server using a local client:

Traceback (most recent call last):
File "set_environment.py", line 100, in main
world = client.load_world(args.town)
RuntimeError: time-out of 5000ms while waiting for the simulator, make sure the simulator is ready and connected to 127.0.0.1:2000

The container doesn't use any TCP ports also:

> sudo docker ps

CONTAINER ID   IMAGE                   COMMAND       CREATED         STATUS         PORTS     NAMES
a20a562d3171   carlasim/carla:0.9.10   "/bin/bash"   2 minutes ago   Up 2 minutes             distracted_hoover

Originally posted by @dhiegomaga in #3431 (comment)

[dbersan]

I found the problem. It was discussed here.

When running the docker, the port should be specified:

sudo nvidia-docker run -p 2000-2002:2000-2002 -it --rm  carlasim/carla:0.9.10 /bin/bash

Then carla can be started headless on the docker, and accessible on port 2000:

SDL_VIDEODRIVER=offscreen ./CarlaUE4.sh -opengl

[corkyw10]

@dhiegomaga, glad you got it working!