Only a minor error --it -> -it
unknown flag: --it
I get a message error if I try to reproduce it.
WARN[0000] `--volume-driver` is ignored for volumes specified via `--mount`. Use `--mount type=volume,volume-driver=...` instead.
docker: Error response from daemon: create sshvolume: invalid option key: "sshcmd".
docker -v
Docker version 17.06.1-ce, build 874a737
Maybe the syntax are changed?