[Pacemaker] Dnsmasq

Trevor Hemsley themsley at voiceflex.com
Fri Mar 23 22:27:34 EDT 2012

I'd guess that your replies are going back with the wrong source IP
address on them and the Windows clients are being picky about accepting
them. Perhaps you need to investigate ocf:heartbeat:IPsrcaddr

On 24/03/12 01:35, Gregg Stock 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="" 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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