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I am running VMware Workstation 16 Pro on my W11 PC. I have several VMs, including a Ubuntu 22.04.4 LTS VM, and a Solaris 10 VM (sadly still needed for legacy projects). I need to allow the Solaris VM access (full RW permissions) to my "/" partition (ext4, /dev/sda3) in the Ubuntu VM. First, is this even possible? If so, what are the steps necessary for this to happen?

On the Ubuntu VM, I went to Settings -> Sharing, enabled Sharing, and then went into Media Sharing, and shared the folder /, and enabled Wired connection 1. In the Solaris VM created the folder /etc/nfs/ub22 (as root), I su'd to root and entered

mount -F nfs 192.168.18.107:/ /etc/nfs/ub22

(1921.68.18.107 is the IP of the Ubuntu VM) but I get the error

nfs mount: 192.168.18.107: : RPC: Rpcbind failure - RPC: Unable to receive
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  • I think the Ubuntu sharing is CIFS/SMB or DAV. Those are different protocols compared to NFS. Commented Jul 18 at 15:29

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Ok, did some more sleuthing and came up with an answer!

On Ubuntu:

  • sudo apt update
  • sudo apt install nfs-kernel-server
  • Create shared directory (if DNE): mkdir -p /path/to/desired/shared/dir
  • Edit /etc/exports file: sudo nano /etc/exports
  • Add mount line: /path/to/shared/dir <client_ip_address>(rw,sync,no_subtree_check,all_squash,anonuid=<your UID>,anongid=<your GID>)

N.B.:

  • You can (likely) lookup your UID/GID in /etc/passwd
  • There cannot be any whitespace between the IP address and the opening paren
  • The above line sets the share as RW, ensures data is written to disk before acknowledgement, disables subtree checking for performance, and sets all file ownership to your Ubuntu UID/GID
  • This is fundamentally insecure, and assumes you have total control over your network environment

Back to commands:

  • sudo exportfs -a
  • sudo systemctl restart nfs-kernel-server

On Solaris:

  • su to root: su -
  • Create a memorable mount point dir, or use an existing one. I did: mkdir /mnt/ub22
  • mount -F nfs <server IP>:/path/to/share/as/in/etc/exports /dir/created/above

And now you can create/delete/edit files in your Solaris VM, which reside in your Ubuntu VM!

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