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Hello kk2105,
I can share the configuration that always works for me. First, I start roscore
outside a docker container.
Locally, and in docker container, I have the following in my ~/.bashrc
:
export ROS_MASTER_URI=http://$(hostname --ip-address):11311
export ROS_HOSTNAME=$(hostname --ip-address)
Caveat: docker container was created with a --network host
flag.
Please try that configuration and let me know if it helps!