On 10/25/2011 01:26 PM, Christoph Wickert wrote:
> I'd like to give my VMs reliable addresses over DHCP and so far I was
> only able to do this by defining them in the libvirt's network config
> with 'virsh net-edit'. But as libvirt runs dnsmasq and dnsmasq usually
> reads /etc/hosts, it should be sufficient to just edit the hosts file.
>
> Unfortunately this doesn't work. Why does dnsmasq ignore /etc/hosts when
> started from libvirt?
I just tested this locally (e.g. by doing "host mytestname" in a guest's
shell) and dnsmasq doesn't ignore the entries in /etc/hosts.
One possibility why it may seem to be failing for you (but is actually
working): dnsmasq reads the contents of /etc/hosts at startup; any
changes made to /etc/hosts after that time will not be seen by dnsmasq
until/unless you either restart dnsmasq, or send it a SIGHUP. To send a
SIGHUP to all your dnsmasq processes, just do this:
killall -HUP dnsmasq
Or possibly you're misunderstanding what dnsmasq does with /etc/hosts.
It will *not* (for example) search for a client's hostname during a DHCP
request, and assign it the address it finds in /etc/hosts. That is what
the <host> elements inside the <dhcp> element are for.
What dnsmasq *does* do with /etc/hosts: when receiving a DNS request for
a hostname, it will look for a resolution for that name in /etc/hosts.
libvirt doesn't disable this functionality by default, and doesn't even
provide a way for the functionality to be disabled, so either you're
hitting one of the two situations above, or you've encountered a bug in
the version of libvirt/dnsmasq you're using.
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