Red Hat Bugzilla – Bug 580215
Virtual network <tftp> element does not enable tftp port
Last modified: 2015-06-21 20:07:23 EDT
Description of problem: When creating a virtual network, libvirt starts an instance of dnsmasq. The description for defining a network via xml says that including a tftp tag within the dhcp tag will let the user point that instance of dnsmasq to a different directory for a tftp root. However, when I try to do this the instance of dnsmasq does not allow pxe booting of the ISO image I've contained in the supplied directory. Version-Release number of selected component (if applicable): (mcpierce@mcpierce-desktop:Podcast)$ rpm -q libvirt libvirt-0.7.4-1.fc13.x86_64 How reproducible: 100% Steps to Reproduce: 1. Use livecd-iso-to-pxeboot to create a tftp root directory for a LiveCD image. 2. Create a virtual interface and tell it to use the created directory as a tftp root. 3. Start a virtual machine and have it boot from the network. Actual results: The VM never PXE boots since dnsmasq never offers the LiveCD image. Expected results: The VM should PXE book the LiveCD image. Additional info: The virtual network is defined with the following XML: <network> <name>testbr5310</name> <forward mode='nat' /> <bridge name='testbr5310' stp='on' forwardDelay='0' /> <ip address='192.168.210.1' netmask='255.255.255.0'> <tftp root='/tmp/tmp.IpID1ZkCQ2' /> </ip> </network>
This seems to work with libvirt-0.7.7-4.fc13 nobody 11062 1 0 12:13 ? S 0:00 /usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --listen-address 192.168.122.1 --except-interface lo --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-lease-max=253 --enable-tftp --tftp-root /var/lib/dnsmasq/tftp --dhcp-boot pxelinux.0 # virsh net-dumpxml default <network> <name>default</name> <uuid>d0d1540f-89a2-4b2a-be23-fa74312c9ae8</uuid> <forward mode='nat'/> <bridge name='virbr0' stp='on' delay='0' /> <ip address='192.168.122.1' netmask='255.255.255.0'> <tftp root='/var/lib/dnsmasq/tftp' /> <dhcp> <range start='192.168.122.2' end='192.168.122.254' /> <bootp file='pxelinux.0' /> </dhcp> </ip> </network> But tftp port 69 is not allowed in the iptables, like ports for dns 53 and bootp 67. Workaround is to insert it manually, then VM PXE boot worked: # iptables -I INPUT -i virbr0 -p udp -m udp --dport 69 -j ACCEPT
Patch posted upstream https://www.redhat.com/archives/libvir-list/2010-June/msg00499.html
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Closing as CURRENTRELEASE, since this should be fixed in F15