synology-nfs-mount-tools

This is a repo that contains tools/documentations to help nfs mounting configuration in Synology

How to config Synology for NFS

Synology's DSM WebGUI has capability to set NFS configuration to allow Linux to access files on Synology NAS, follow tutorial: How to access files on Synology NAS within the local network (NFS)

But the GUI's feature is limited. We need more fine tuning. Following NFS: Overview and Gotchas, we can set Synology properly. (If the URL is broken, we can refer to [NFS: Overview and Gotchas in repo](/source/NFS_Overview/NFS\ Overview\ and\ Gotchas.htm)

Summary of how to configure NFS server

Configuring an NFS server is just placing a line in /etc/exports file. The line's general syntax is:

directory_being_shared subnet_allowed_to_access(options)

There are 2 kinds of options:

• General options (ignored here)
• User ID Mapping options (need to be mentioned here)

We want to make directories accessible as if the incoming request was from that user or that group, which is done by combining all_squash option with anonuid and anongid options.

e.g.

/volume1/homes	192.168.1.85(rw,sync,no_wdelay,crossmnt,all_squash,insecure_locks,sec=sys,anonuid=1025,anongid=100)

where:

• /volume1/homes is the directory to be shared
• 192.168.1.85 is the ip address of client
• rw is Read/Write
• async is for fast access. sync is for safer access
• no_wdelay is "Write disk as soon as possible"
• anonuid=1025 is uid of "guest"
• anongid=100 is gid of "guest/user"

Summary of how to configure client

mount -t nfs -o rw 192.168.100.85:/data/altamonte /mnt/test

Current solution

Due to limitation of NFS4.0, idmapping is too hard (mismatch between server and client's uid/gid), and kerberos authentication is too hard to setup. The only solution is NFS+chown

1. Setup NFS permission of shared folder on Synology
2. mount volume to client
3. When writing files, remember to chown afterward

For plex server, I need to align LXC's uid and gid with Synology

Reference

• NFS: Overview and Gotchas
• How to setup NFS server and client