Pulling/pushing Docker images is extremely slow in China. There are a few ways to speed up docker pulling/pushing in China.

Using the Official China Mirror

Now the best way is to use the offical China mirror. Please refer to Docker 中国官方镜像加速 …

If the docker container was started using /bin/bash (you can check using docker ps) command you can access it using attach.

docker attach container_name_or_id

If the docker container was started but not with /bin/bash, you have to create a bash instance inside the container using exec.

docker exec …