[rhos-list] dnsmasq cannot start properly

Shixiong Shang (shshang) shshang at cisco.com
Tue Feb 19 01:14:15 UTC 2013


Hi, Perry:

Thanks a bunch for the pointer. I exchanged a couple of emails with Gary on this issue, which occurs on compute-node. We had workaround/solution in place right now, so it is not a road blocker for us. I will continue working with Gary until it is resolved and verified.

In my configuration, I separated all quantum functions from compute onto a separate machine, i.e. as-net1. The default iptables rules happen to allow DHCP packets at inbound direction. Beyond that point, I verified at OVS bridges (both br-eth1 and br-int) and I could see DHCP DISCOVER message was passed upstream all the way to tap interface. As a result, I expected dnsmasq to return IP assignment conveyed by DHCP OFFER message. However, it never happened.

Would like to make sure there is no misconfiguration on my side.

Thanks again!

Shixiong



On Feb 18, 2013, at 7:58 PM, Perry Myers <pmyers at redhat.com<mailto:pmyers at redhat.com>>
 wrote:

On 02/18/2013 07:50 PM, Shixiong Shang (shshang) wrote:
Hi, Chris:

If I completely disabled SELinux, then dnsmasq process could start
without any error. However, my VM still couldn't obtain IP address from
the DHCP server. Based on tcpdump right on tap interface to which DHCP
server was hooked up, I saw inbound DHCP Discover message from VM. But I
never saw DHCP OFFER message returned back to VM. I checked dnsmasq host
files and it contains the right mapping between VM MAC and IP
address…..Anything could go wrong?

Maybe you're hitting this error?
https://bugzilla.redhat.com/show_bug.cgi?id=889868

Gary is working on that one, and we hope to have a fix in the next build
of quantum to put out on RHN/CDN.

There's an upstream patch in review:
https://review.openstack.org/#/c/22183/

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