Test utility for re-connecting shared mount points within Docker.
The (node.js) program within uses FUSE to expose whatever is mounted
at /source as a mount point inside whatever is mounted at /shared
First, we need to prepare a shared folder:
mkdir /tmp/shared
mount --bind /tmp/shared /tmp/shared
mount --make-shared /tmp/shared
Build the docker image (assuming this folder is pwd):
docker build -t fuse-test .
Run a container:
docker run --name fuse-server -d -v /tmp/shared:/shared:shared -v $(pwd):/source --privileged --device /dev/fuse fuse-test
You should, on the host, now be able to see the contents of pwd
at /tmp/shared/fuse. Now, we want to mount that endpoint inside
another container.
docker run -d --name fuse-client -v /tmp/shared/fuse:/shared:ro,rslave busybox top
If we exec in, we should see our shared folder:
docker exec -it fuse-client sh
ls /shared
Exit out, and restart the fuse server:
docker restart fuse-server
Finally, exec back into the client and see that the transport is now disconnected:
docker exec -it fuse-client sh
ls /shared
>> ls: /shared: Transport endpoint is not connected