[libvirt] dnsmasq-248 (CentOS/RHEL) compatibility
gene at czarc.net
Fri Nov 2 12:57:04 UTC 2012
There are currently three significant libvirt patches I am involved with:
1. Change so that dnsmasq parameters are in a conf file instead of on
the command line.
2. A small patch to add dnsmasq parameter interface=
3. A significant patch to add DHCPv6 support to libvirt.
A concern has been raised about the compatibility of my patches with
dnsmasq-2.48 which is the version on CentOS 6 and RHEL 6. While
something like libvirt-1.0.0 is not officially supported, there is a
strong desire not to get in the way of individuals back-porting it.
Plan A: Install CentOS 6.3 into a virtual guest. Apparently, the
current virt-manager has some problems running CentOS 6.3. Since I was
here to drain a swap, I decided not to go after this alligator.
Plan B: Get a the src.rpm for dnsmasq-2.48 from CentOS and build it on
Fedora 17. Then, using a Fedora 17 virtual guest, downgrade install
dnsmasq-2.48 on it.
I then took four of my virtual dnsmasq conf-files than I use, slightly
modify them to use interface=eth2 and common pid, hostsfile, addnhosts,
and leases files. I then fed each of these configuration files to
dnsmasq-2.48. Everything worked except for the one which had an IPv6
dhcp-range specified. That was not surprising dnsmasq-2.48 only
supports IPv6 for dns.
If someone has some additional tests they would like run, please say so.
My recommendation: Incorporate my patches [when I finish the DHCPv6 one
and resubmit the others]. Add (somewhere?) a warning to backporters
that they will need to update their dnsmasq packages to actually do
DHCPv6 but otherwise, earlier versions such as dnsmasq-2.48 will be
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