Conflict. The container name

$ nvidia-docker run --name test1 -p 1234:1234 -di test/project:ver1.0
docker: Error response from daemon: 
Conflict. The container name "/test1" is already in use by container "aaaaaa".
 You have to remove (or rename) that container to be able to reuse that name.
See 'docker run --help'.

docker container ls

docker rm test1

dockerコンテナのコンフリクトを解消 – エラーの向こうへ