Hi Amir, Thanks for the prompt reply. The Linux distribution is RHEL 7.4 and the kernel version is 3.10.0-693.2.2.el7.x86_64 Following is the dmesg output --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- [ 1341.548099] TECH PREVIEW: Overlay filesystem may not be fully supported. Please review provided documentation for limitations. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Following is the log message from /proc/self/mountinfo --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 112 62 0:40 / /mnt/nfs rw,relatime shared:63 - nfs4 10.32.8.113:/var/nfs rw,vers=4.1,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.32.8.113,local_lock=none,addr=10.32.8.113 113 62 0:39 / /home/czheng2/test/merged rw,relatime shared:65 - overlay overlay rw,lowerdir=/mnt/nfs/lower,upperdir=/home/czheng2/test/upper,workdir=/home/czheng2/test/work --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- I also tried on Fedora 26 with kernel version 4.13.5-200.fc26.x86_64 I got same error, but this time, I cannot find overlay related log from dmesg Following is the log message from /proc/self/mountinfo --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 202 66 0:54 / /mnt/nfs rw,relatime shared:145 - nfs4 192.168.10.123:/var/nfs rw,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.10.123,local_lock=none,addr=192.168.10.123 205 84 0:47 / /home/zc/test/merged rw,relatime shared:152 - overlay overlay rw,seclabel,lowerdir=/mnt/nfs/lower,upperdir=/home/zc/test/upper,workdir=/home/zc/test/work --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Best, Charles On Mon, Oct 16, 2017 at 4:41 PM, Amir Goldstein <amir73il@xxxxxxxxx> wrote: > 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
