Re: AW:DNS in virtual router not stable
Thanks for the reply. We have been thinking about updating /etc/hosts of
each of the VM to add the entries for other VMs. Then we don't have
dependency to the DNS in the virtual router. But there's lots of work as
VMs are being added / removed continuously in our case. I just hope there
will be easier solution.
From: Benjamin Naber <benjamin.naber@xxxxxxxxxxxxxx>
To: "users@xxxxxxxxxxxxxxxxxxxxx" <users@xxxxxxxxxxxxxxxxxxxxx>
Date: 2018/12/13 09:39 AM
Subject: AW:DNS in virtual router not stable
I've seen this problem to. The solution is to handle your ip address by
the host youre adding static by api or gui. The router VM uses the old
host entries set in /etc/hosts if you cleanup vpc network. The host file
will be cleared.
Von meinem Huawei-Mobiltelefon gesendet
-------- Originalnachricht --------
Betreff: DNS in virtual router not stable
Von: Ivan X Yue <ivanyue@xxxxxxxxxx>
We are using Cloudstack 4.9.2 with KVM and advance networking
We are having VPC network, and need to continuously adding / removing VM.
One issue we found is, from time-to-time, on the VM deployed, it gets
error that the hostname of the other VM is not resolved. We dig into the
VR, and it seems that every time a VM is added or removed, the dnsmasq
needs to be restarted. And based on /var/log/dnsmasq.log, there is 2
second delay before dnsmasq is running again. Quite likely while restart
is happening, the DNS is not working and therefore VM will not be able to
Dec 12 15:22:55 dnsmasq: exiting on receipt of SIGTERM
Dec 12 15:22:57 dnsmasq: started, version 2.62 cachesize 150
Dec 12 15:26:36 dnsmasq: exiting on receipt of SIGTERM
Dec 12 15:26:38 dnsmasq: started, version 2.62 cachesize 150
We don't see this issue in CloudStack 4.11. In 4.11, we also see dnsmasq
being restarted in dnsmasq.log, but there is no delay between exiting and
Is there anything we can do in 4.9.2 to have the DNS more stable. e.g.
can dnsmasq not being restarted even new VM info is added? Or can it just
reload the VM info?