在 docker-compose 中挂载主机 Vm

Question

I want to mount the host vm in Docker for Windows in my container (for backup purpose). I found a short article about it which says to run

docker container run --rm -it -v /:/host alpine

to do this. I tried and it works fine. Now i wanted to put it into a docker-compose file. However

volumes:
  - / :/host:ro

doesn't work. I don't get an error message, the folder is just empty. The space in front of the colon was necessary, without it I got an error.

Does someone know how to set this up in docker-compose?

Answer 1

Just write the same way you did on docker run , do not put any space between directories.

volumes:
   - /:/host:ro

But with :ro docker will not write anything to it and will simply read the contents of the directory. If you want to write, remove the :ro .