Mount a shared NFS from TrueNAS on CentOS
2 min read

Mount a shared NFS from TrueNAS on CentOS

Mount a shared NFS from TrueNAS on CentOS

On the setup of my house, I've decided that configuration files should be stored on the NAS. For this, the idea is that the NAS would have a share (say "config")which would be mounted on the other machines. Each application would then have its own directory in that config, so they don't overlap. Think docker volumes...

So, I have a TrueNAS and a linux machine for this exercise. I've created a dataset and tried to mount it on the linux machine, but... I used to get that the folder has 0755 permission and belongs to ... you guessed it: root:root.

Correct setup

I've used the following steps:

On the NAS

  1. Log in on the NAS and on the linux machine and identify a uid/gid combination which is not used.
  2. Create a group on the NAS with the GID identified above. I used config
  3. Create an user on the NAS with the UID from step 1 and belonging to the group created at step 2. I used an user named config too.
  4. Create a new dataset for the base directory which will be mounted and set it to belong to the new user:group. I used /mnt/Main/data/config

On the linux machine

  1. Repeat steps 1 to 3 from above
  2. Create a new directory where the NFS share would be mounted. I used /mnt/config
  3. Mount the remote folder.

I used ansible for all this:

- name: Ensure group "config" exists with correct gid
    name: config
    state: present
    gid: 9013

- name: Add "config" user with correct gid
    name: config
    comment: Configuration NFS user
    uid: 9013
    group: config
      - docker

- name: Create config dir
    path: /mnt/config
    state: directory

- name: Unmount NAS share
    path: /mnt/config
    state: unmounted

- name: Mount NAS share
    src: '{{nas_ip}}:{{nas_share}}'
    path: /mnt/config
    opts: rw,sync,hard,intr
    state: mounted
    fstype: nfs

Where the nas_ip and nas_share are the identification of my NFS share.


The trick is: have matching owners on both machines

PS: In my defense, last time I mounted a NFS was about 10 years ago :)