Store `docker run` command output in BASH variable

I’m having an issue storing the output of docker run -it -d -p 43211:3000 --name appname -h hostname -v $PWD/local_dir:/root/remote_dir repo/imagename in a BASH varibale. I tried `backticks`, I also tried running it like the official docs say BASH_VAR=$(docker run ...), I even tried storing the output in a file with docker run --...>$FILE_DESCRIPTOR, but no luck storing the error situation, the situation when the name is already used by another container, like so:

$ FATA[0000] Error response from daemon: Conflict. The name "appname" is already in use by container 7c84d8d703c8. You have to delete (or rename) that container to be able to reuse that name.

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    Any help would be appreciated.


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