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I recently changed my home server setup from a basic Ubuntu Server installation running everything to a virtualised environment. I am currently running ProxMox type 1 hypervisor, with several VM's. Most of my services are run in Linux Containers (LXC), some of these services need access to a shared dataset. In order to provide access to the shared data set, I passed the data HDD through to a VM and then setup NFS exports. The LXC's then mount the NFS shares. However I am constantly coming across user permissions errors from different services. How can I easily manage these permissions across multiple LXC's without just setting everything to 777`.

UPDATE

Example of export:

/mnt/data/www 192.168.0.0/24(rw,async,no_root_squash,no_subtree_check,insecure)

Example of mount in fstab:

192.168.0.254:/mnt/data/www /mnt/www nfs auto,x-systemd.automount,soft,rsize=16384,wsize=16384,timeo=14,intr    0      0

The errors are in the form of permissions denied, as one LXC may create a file under the user www-data, but another LXC cannot access the file as it shows up as being owned by MySQL, I understand this is because of mismatching UID's, but I can't figure out how to solve the problem.

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    Post the details of your NFS exports along with the errors you're getting. Without that, it's impossible to say how you should manage your permissions.
    – Andrew Henle
    Feb 3 '16 at 14:53
  • I have updated the original post. I will add specific permissions issue errors later as I cannot access them at the moment from my mobile.
    – Craig Lowe
    Feb 3 '16 at 15:01
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If you use NFS v4 you can map UIDs. Otherwise, you need to make sure that user and group IDs are consistent across all your VMs.

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