连接docker的时候会出现：
docker: Error response from daemon: Conflict. The container name "/nachos" is already in use by container "39a3325afcf244d275555cf483786aa2d96f84dde69b29affd55cdafa65a7ed1". You have to remove (or rename) that container to be able to reuse that name.
解决方法是：
sudo docker container ls -all
获得ID，然后
sudo docker start 39a3325afcf2
sudo docker attach 39a3325afcf2