On Sat, 16 Nov 2019 at 14:50, Patrick O'Callaghan <pocallaghan@gmail.com> wrote:

This is quite embarrassing, but I'm banging my head against a wall and
hoping other eyes will spot some obvious mistake.

I have an F31 guest (fedora30) running in QEMU/KVM on an F31 host
(Bree). I want to mount a host directory via NFS in the guest. I set
this up a long time ago and it has worked through several Fedora
releases without issue, but in a fit of spring cleaning I did a fresh
install of F31 rather than my usual update, so of course now it doesn't
work. Clearly I did something right back in the day and have now
forgotten what it was.

There have been changes to NFS, particularly, NFSv4, but also some

measures to make it less insecure. Meanwhile, 9p is widely used to

share files between VM guests and hosts (mostly because it needs

fewer host resources), see:

https://www.linux-kvm.org/page/9p_virtio which gives an example

for Fedora 15. https://wiki.qemu.org/Documentation/9psetup looks

more current. It begins with kernel config, which should not be

needed with Fedora. http://blog.allenx.org/2015/07/03/virtio-9p-note

may also be helpful. https://unix.stackexchange.com/questions/240281/virtfs-plan-9-vs-nfs-as-tool-for-share-folder-for-virtual-machine has some pros and cons for NFS versus 9p in a production

environment, but several years old now.

Unless you have a specific need for NFS it may be better use of your

time to configure 9p passthru.

The guest can ping the host and ping the wider Internet, so basic
connectivity works (this is via a NAT-style connection). The host can
ssh into the guest.

Firewall setup on the host:
[poc@Bree ~]$ firewall-cmd --list-all
home (active)
target: default
icmp-block-inversion: no
interfaces: enp3s0
sources:
services: dhcp dhcpv6-client dns libvirt mdns mountd nfs nfs3 plex rpc-bind rsyncd samba samba-client ssh
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:

And on the guest:
[poc@fedora30 ~]$ sudo firewall-cmd --list-all
home (active)
target: default
icmp-block-inversion: no
interfaces: enp1s0
sources:
services: dhcpv6-client mdns samba-client ssh
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:

Guest ip:
[poc@fedora30 ~]$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:ca:07:30 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.156/24 brd 192.168.122.255 scope global dynamic noprefixroute enp1s0
valid_lft 2893sec preferred_lft 2893sec
inet6 fe80::2e77:5bc1:d19a:6045/64 scope link noprefixroute
valid_lft forever preferred_lft forever

and routing:
[poc@fedora30 ~]$ ip route
default via 192.168.122.1 dev enp1s0 proto dhcp metric 100
192.168.122.0/24 dev enp1s0 proto kernel scope link src 192.168.122.156 metric 100

[poc@Bree ~]$ ping fedora30
PING fedora30 (192.168.122.156) 56(84) bytes of data.
64 bytes from fedora30 (192.168.122.156): icmp_seq=1 ttl=64 time=20.1 ms
...

Exports on the host:
[poc@Bree ~]$ sudo exportfs
/home/Media 192.168.0.0/16
/home/poc/Shared
vm-*
/home/poc/Shared
fedora*

But from the guest:
[poc@fedora30 ~]$ showmount -e bree
clnt_create: RPC: Unable to receive

What am I missing?

poc

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