[Pacemaker] Dnsmasq

[David Coulson]

Did dnsmasq log that it is listening on the cluster address? You could try adding an iptables nat rule to the box and see if that works. Nat the cluster address for port 53 to the local server ip. 

Sent from my iPad

On Mar 23, 2012, at 9:35 PM, Gregg Stock <gregg at damagecontrolusa.com> wrote:

> I'm have some "interesting" behavior with a pacemaker managed DNS server.  Here is the basic setup:
> 
> primitive p_dnsmasq lsb:dnsmasq \
>        op monitor interval="60s" timeout="30s"
> primitive p_ip_dnsmasq ocf:heartbeat:IPaddr2 \
>        params ip="192.168.1.250" cidr_netmask="24" \
>        op monitor interval="10s"
> order o_ip_before_dns inf: p_ip_dnsmasq p_dnsmasq
> 
> The cluster seems to manage the resource ok.
> 
> If the dnsmasq server is running on the hosts regular ip address, everything is fine. When switching to the cluster managed ip address, I get the following behavior on our network. The behavior was the same for various permutation of the listening addresses in the dnsmasq.conf file.
> 
> 1. Linux hosts are fine.
> 2. Windows and Mac hosts can ping the DNS server but don't get DNS service. I was able to verify that the requests were getting to the DNS server but the replies were getting and ICMP destination unreachable on the way back.
> 
> I was able fine a tidbit of information here http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2010q2/003906.html
> 
>        A destination unreachable ICMP reply is normally generated by the kernel
>        when there is nothing listening on that port. The most likely reason for
>        that is that the dnsmasq process no longer exists. If that's the case
>        the problem changes into "find why the dnsmasq daemon is exiting".
> 
> This doesn't seem to be completely applicable because the dnsmasq daemon is running.
> 
> Any additional information required?
> 
> Thanks in advance.
> 
> Best regards,
> Gregg Stock
> 
> 
> 
> 
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