[LITMUS^RT] HELP:NFS+KVM Tutorial

[Glenn Elliott]

On Jan 19, 2014, at 7:07 PM, Sanjib Das <cnt.sanjib at googlemail.com> wrote:

> Dear Concern,
> 
> Can any one give me some suggestion about file sharing. Cause I am following the link https://wiki.litmus-rt.org/litmus/LiblitmusViaNFS but still not succeeded.
> 
> I am trying to do this with the following command 'qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -hda /home/sdas/images/ubuntu.backing.qcow2.img -m 1024 -name "ubuntu-qemu-cjk" -nographic -kernel "/home/sdas/litmus/litmus-rt/arch/x86_64/boot/bzImage" -append "console=ttyS0,115200 root=/dev/hda1" -gdb tcp::12345 -net nic -net user,hostfwd=::2222-:22' 
> 
> And as a result eth0 in side the guest is configured automatically 
> 
> From guest to host  'ping 10.0.2.2' is working
> "root at ubuntu-qemu:~# ping 10.0.2.2
> PING 10.0.2.2 (10.0.2.2) 56(84) bytes of data.
> 64 bytes from 10.0.2.2: icmp_req=1 ttl=255 time=2.28 ms
> 64 bytes from 10.0.2.2: icmp_req=2 ttl=255 time=0.515 ms
> ^C
> --- 10.0.2.2 ping statistics ---
> 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
> rtt min/avg/max/mdev = 0.515/1.398/2.281/0.883 ms
> root at ubuntu-qemu:~# 
> "
> But Host to guest 'ping 10.0.2.15' not working
> 
> "sdas at debian:~$ ping 10.0.2.15
> PING 10.0.2.15 (10.0.2.15) 56(84) bytes of data.
> ^C
> --- 10.0.2.15 ping statistics ---
> 2 packets transmitted, 0 received, 100% packet loss, time 1006ms
> 
> sdas at debian:~$ 
> "
> 
> ip route guest :
> root at ubuntu-qemu:~# ip route
> default via 10.0.2.2 dev eth0  metric 100 
> 10.0.2.0/24 dev eth0  proto kernel  scope link  src 10.0.2.15 
> root at ubuntu-qemu:~# 
> 
> 
> ip route host:
> 
> sdas at debian:~$ ip route
> default via 192.168.0.1 dev eth0 
> 169.254.0.0/16 dev eth0  scope link  metric 1000 
> 192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.101 
> sdas at debian:~$ 
> 
> my host is debian 7 wheezy.
> 
> Any quick suggestion/ alternate tutorial / link/  will very helpful.


I don’t believe that direct network access from the host to the guest is necessary to get NFS to work.  With respect to host->guest networking, you can ssh into the guest OS by doing “ssh -p 2222 realtime at localhost”.  If you want to set up a virtual network, I believe these instructions will be useful: http://wiki.qemu.org/Features/HelperNetworking

Anyway, assuming that your NFS server on the host is working and your guest can ping the host, I believe your guest OS should be able to mount the host’s network drive.  You’ve already shown that the guest can ping the host.  Are you sure NFS is working on the host?  What do the NFS logs say?

-Glenn

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