install docker
sfti
build image to a image name - imgname
docker build -t imgname .
run docker to a container name - ctname
docker run -d -p port:22 -v local:/root/dir --name ctname imgname /usr/sbin/sshd -D
in which portnum: like 10888 whatever local: a dir in local like /home/test
setting ssh host -- add to ~/.ssh/config
Host ctname HostName localhost User root Port portnum
connection
ssh ctname password: root