Re: NFS-mounting from a QEMU/KVM guest

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On Sun, 2019-11-17 at 09:55 +0100, Tom H wrote:
> On Sat, Nov 16, 2019 at 7:50 PM Patrick O'Callaghan
> <pocallaghan@xxxxxxxxx> 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.
> > 
> > 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?
> 
> Does "showmount ..." list anything on "bree" itself?
> 
> What's the output of "cat /proc/fs/nfsd/versions" and "ss -ntul | grep
> -E "111|2049|20048" | column -t" (on "bree")?
> 
> "showmount ..." won't work if the first doesn't have "+3" or if the
> second doesn't have rpcbind, nfsd, and mountd lines.
> 
> FTR. for firewalld:
> "mountd" opens 20048, tcp & udp
> "nfs" opens 2049, tcp
> "nfs3" opens 2049, tcp & udp
> "rpc-bind" opens 111, tcp & udp

Thanks. I solved it by adding the services to the libvirt zone as Ed
recommended.

poc
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