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NFS root file system on Fedora

Here are a few notes on making your Fedora workstation serve a root file system for some embedded Linux target. There are a couple of additional steps when compared to Ubuntu, namely telling the firewall to allow NFS traffic and re-enabling NFSv2 support.

First, install the NFS and rpcbind packages:

sudo dnf install -y nfs-utils rpcbind

Enable and then activate services:

sudo systemctl enable rpcbind
sudo systemctl enable nfs-server
sudo systemctl start rpcbind
sudo systemctl start nfs-server
sudo systemctl start rpc-statd
sudo systemctl start nfs-idmapd

Tell the firewall to allow NFS connections:

sudo firewall-cmd --permanent --add-service nfs
sudo firewall-cmd --permanent --add-service rpc-bind
sudo firewall-cmd --permanent --add-service mountd
sudo firewall-cmd --reload

Enable NFSv2 support. This is very important as the Linux kernel explicitly uses the old NFS version 2 protocol when NFS booting, however NFS version 2 is disabled by default in Fedora 22, 23, and so on. Edit /etc/sysconfig/nfs and set RPCNFSDARGS= to “-V 2” in order to enable NFSv2.

Restart services for this to take effect:

sudo systemctl restart nfs-config
sudo systemctl restart nfs
sudo systemctl restart rpcbind

Verify that NFSv2 support is enabled by checking /proc/nfsd/versions,

sudo cat /proc/fs/nfsd/versions
+2 +3 +4 +4.1 +4.2

The +2 indicates NFSv2 support. You should now be able to add your exported file systems to /etc/exports.d/ and then run:

sudo exportfs -ra

to reload and add the new entries.

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