Docker container acutronicrobotics/gym-gazebo2 installed, what to do next?

asked 2020-12-20 13:34:52 -0500

duttonide gravatar image

updated 2020-12-20 13:39:07 -0500

Hello, I am new to docker

I have installed the docker container by a pull request from It got installed correctly as shown below:

duttonide@ubuntu:~$ docker images
REPOSITORY                      TAG                 IMAGE ID            CREATED             SIZE
<none>                          <none>              5415654e5aef        12 hours ago        63.3MB
ubuntu                          bionic              2c047404e52d        3 weeks ago         63.3MB
hello-world                     latest              bf756fb1ae65        11 months ago       13.3kB
acutronicrobotics/gym-gazebo2   latest              b5ccf2feaca5        18 months ago       3.82GB

When I run the docker I get the following errors:

duttonide@ubuntu:~$ docker run -it acutronicrobotics/gym-gazebo2 
root@b47af471b8bf:~/gym-gazebo2# cd ~/ros2learn/experiments/examples/MARA
bash: cd: /root/ros2learn/experiments/examples/MARA: No such file or directory
root@b47af471b8bf:~/gym-gazebo2# python3
python3: can't open file '': [Errno 2] No such file or directory
root@b47af471b8bf:~/gym-gazebo2# exit

The official github repo that shows the docker file installation here: is quite different.

On trying to install it from here, on running the following code:

cd ~ && git clone -b dashing
cd ~/ros2learn/docker
docker build -t r2l .

I got the following errors:

[0.192s] WARNING:colcon.colcon_ros.prefix_path.catkin:The path 
'home/ros2_example_ws/install/examples_rclcpp_minimal_action_client' in the environment variable 
CMAKE_PREFIX_PATH doesn't exist
--- stderr: composition                         
CMake Error at CMakeLists.txt:133 (find_package):
By not providing "Findlaunch_testing_ament_cmake.cmake" in
CMAKE_MODULE_PATH this project has asked CMake to find a package
configuration file provided by "launch_testing_ament_cmake", but CMake did
not find one.

Could not find a package configuration file provided by
"launch_testing_ament_cmake" with any of the following names:


 Add the installation prefix of "launch_testing_ament_cmake" to
 CMAKE_PREFIX_PATH or set "launch_testing_ament_cmake_DIR" to a directory
 containing one of the above files.  If "launch_testing_ament_cmake"
 provides a separate development package or SDK, be sure it has been

Then I followed the solutions suggested here:

The same issue persists may be because the file in the docker should contain all these files which brings me back to the original docker pull, now that I have it what should I do next?

Please help with this. Thanks in advance.

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Just to be sure. Have you done the git clone inside the container?

Solrac3589 gravatar image Solrac3589  ( 2020-12-21 01:17:59 -0500 )edit

In the case the issue is missing dependencies, a fast trick for me should do to do a new imaged based on the one you are using here (starting with FROM acutronicrobotics/gym-gazebo2:latest if I am not wrong) and add the dependencies. You can later keep this image for yourself or upload it on docker hub!

Solrac3589 gravatar image Solrac3589  ( 2020-12-21 01:22:23 -0500 )edit

I had downloaded it and i think i kinda succesfully loaded it.

The difference between yours and mines is that I amb actually using the example already loaded in the container instead of cloning it again.

cd ~/gym-gazebo2/examples/MARA
python3 -g

What I saw from the dockerhub web you posted here.

Hope is that.

PD: Remember you should change DDS to OpenSpice probably before executing it (it is said also in dockerhub)

export RMW_IMPLEMENTATION=rmw_opensplice_cpp
Solrac3589 gravatar image Solrac3589  ( 2020-12-21 01:38:50 -0500 )edit