[Qemu-devel] [Bug 546638] Re: Connection error when use PXE+NFS to boot guest

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/546638

Title:
  Connection error when use PXE+NFS to boot guest

Status in QEMU:
  Expired

Bug description:
  I use NFS+PXE to boot RHEL 5. The installation is slow, and I send
  Ctrl+Alt+F4, then find that half (but not all) of connections are
  dropped:

  nfs: server 192.168.122.50 OK
  nfs: server 192.168.122.50 OK
  nfs: server 192.168.122.50 OK
  nfs: server 192.168.122.50 not responding, still trying
  nfs: server 192.168.122.50 OK
  nfs: server 192.168.122.50 not responding, still trying
  nfs: server 192.168.122.50 not responding, still trying
  :
  :

  I have checked that there is no IP conflict.

  Host machine
  Kernel: 2.6.32.9-70.fc12.x86_64
  QEMU version: 0.12.3-2.fc12.x86_64
  libvirt version: 0.7.1-15.fc12.x86_64

  Guest machine 1 (NFS server)
  Kernel: 2.6.18-164.el5
  nfs-utils version: 1.0.9-42.el5
  Set up command: virt-install --connect qemu:///system -n m5 --vnc 
--accelerate --ram=256 --noreboot --os-type=linux --pxe --os-variant=rhel5 
--mac=52:54:00:50:00:00 --file=/dev/VolGroup00/m5

  Guest machine 2 (the machine to be installed via PXE+NFS)
  Set up command: virt-install --connect qemu:///system -n e51 --vnc 
--accelerate --ram=128 --noreboot --os-type=linux --pxe –os-variant=rhel5 
--mac=52:54:00:51:01:00 --file=/dev/VolGroup00/e51

  ============================================================================
  I try to use NFS under different situations to test.
  Test 1) Try normal NFS mount. This test successes.
  Test 2) Try to boot a diskless machine via PXE, use a NFS mount point at 
root. This test suffers the same problem

  At test 1)
  NFS client mount an export of the NFS server, and use command "find ." to see 
if it runs smoothly.
  Result: it runs smoothly for thousands of lines.

  Guest machine 3 (NFS server)
  Kernel: 2.6.18-164.el5
  Set up command: virt-install --connect qemu:///system -n dm1 --vnc 
--accelerate --ram=256 --noreboot --os-type=linux --pxe --os-variant=rhel5 
--mac=52:54:00:d1:00:00 --file=/dev/VolGroup00/dm1

  NFS client is Guest machine 1 mentioned before.

  At test 2)
  Set up a PXE server, write a customized initrd, in which init script uses 
"mkrootdev -t nfs -o nolock,ro" to set root directory on a NFS mount.

  Result: the client machine can boot, but very slowly, with numerous
  nfs: server 192.168.122.110 OK
  nfs: server 192.168.122.110 not responding, still trying

  NFS server: it is Guest machine 3
  Client to be booted: Guest machine 4
  Set up command: virt-install --connect qemu:///system -n de11 --vnc 
--accelerate --ram=128 --noreboot --os-type=linux --pxe –os-variant=rhel5 
--nodisk --mac=52:54:00:d1:01:00

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