I just encountered this and it's an issue with the official template. To resolve the issue with the error (for those who may be searching like me): docker: Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: error mounting "/mnt/cache/appdata/postgresql_alpine" to rootfs at "/var/lib/postgresql/data": change mount propagation through procfd: open o_path procfd: open /var/lib/docker/btrfs/subvolumes/<uniquekey>/var/lib/postgresql/data: no such file or directory: unknown. You just need to edit the Docker configuration as follows: 1) Edit the "Database Storage Path" path. 2) Change the "Container Path" from /var/lib/postgresql/data to /var/lib/postgresql 3) Apply That error should go away as the path is now mapped correctly in the container.