On Mon, Oct 16, 2017 at 7:13 PM, charles zheng <czheng2@xxxxxx> wrote: > Hi Miklos, > > We are developing a docker related system that requires to union > directories on NFS and local filesystem. I successfully created a > overlayfs that has lower layer located on NFS and upper layer located > on the local file system. But when I tried to create new files in the > directory located on NFS, I got error message: "Operation not > supported". Does that mean I can not create new files inside the > directory located on NFS? But base on the documentation of overlayfs, > lower layer does not need to be writable. > > Steps to reproduce the problem are (/mnt/nfs is the NFS mount, > /home/zc is the local mount) > > 1. create directory "/mnt/nfs/lower/lower_dir" > > 2. create directories "/home/zc/upper/upper_dir", "/home/zc/work" and > "/home/zc/merged" > > 3. create overlayfs by running command > > mount -t overlay overlay -o\ > lowerdir=/mnt/nfs/lower,\ > upperdir=/home/zc/upper,\ > workdir=/home/zc/work \ > /home/zc/merged > > 4. Try to create new file "/merged/lower_dir/test.txt" and get error > message "Operation not supported" > Hi Charles, This should definitely work. Please specify with kernel version/commit you are testing with Please attach relevant overlayfs logs from dmesg when you get the error and from overlayfs mount time. Please attach content of /proc/self/mountinfo after overlay is mounted Thanks, Amir. -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
