[SOLVED] Error: mount: only root can use "--types" option (effective UID is 100000)

[Zavod]

Fresh install of Proxmox 6.3-3 on Debian 10 (4.15.18-1-pve).

Trying to make NFS shared folder for containers:

Allow NFS in apparmor profile: /etc/apparmor.d/lxc/lxc-default-cgns

mount fstype=rpc_pipefs,
mount fstype=nfs,
mount options=(rw, bind),

restart APPARMOR,
setup /etc/exports with /mnt/shared_folder 10.5.0.100(ro,sync,no_subtree_check)

LXC container config (Debian10 template):

/etc/pve/lxc/100.conf

arch: amd64
cores: 1
hostname: DebianTest
memory: 512
nameserver: ****
net0: name=eth0,bridge=vmbr0,firewall=1,gw=10.5.0.1,hwaddr=B6:FA:80:6C:4D:3D,ip=10.5.0.100/24,type=veth
ostype: debian
rootfs: local:100/vm-100-disk-0.raw,size=10G
searchdomain: ****
swap: 512
unprivileged: 0
unused0: A02:100/vm-100-disk-0.raw

But then i trying to mount shared folder inside container, got error:

root@DebianTest:/# mount -t nfs 10.5.0.1:/mnt/shared_folder/ /mnt
mount: only root can use "--types" option (effective UID is 100000)

No additiobal errors at syslog on NFS server. Trying with Ubuntu 18 template with same result.

On previous version of proxmox this setup works well, any ideas how to solve it ?

 

[Zavod]

I do not resolve this problem, so i found another way to mount shared folder from proxmox hypervisor inside container, via mount bind:

pct set 100 -mp0 /mnt/hypervisor_shared_folder/,mp=/mnt/,ro=1

This solved my goal to get a readonly shared folder for containers.

 

[Zavod]

mount: only root can use "--types" option (effective UID is 100000)

I suspect that this error couse of this line - unprivileged: 0