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From Chiradeep Vittal <Chiradeep.Vit...@citrix.com>
Subject Re: alter resolv.conf nameservers on linux
Date Thu, 08 Nov 2012 18:18:34 GMT
Did you restart the VR through the api / UI ?
What is the output of
cat /var/cache/cloud/cmdline
grep "dhcp-option=6" /etc/dnsmasq.conf

Management server log:
grep "Boot Args for" <log file>

On 11/7/12 8:40 PM, "Caleb Call" <calebcall@me.com> wrote:

>Sorry, yes, setting the global parameter does not work.  The contents of
>my /etc/resolv.conf is:
>
># cat /etc/resolv.conf
>; generated by /sbin/dhclient-script
>search cs1cloud.internal
>nameserver <ip of my vrouter>
>
>I can edit it to what I want it to be, restart the instance and it gets
>changed back to this.  This happens across all my zones in all my
>different Cloudstack environments.  DNS is configured correctly for them.
>
>The reason for my desire to not use my virtual router is two fold.
>First, I have found the name resolution (forwarding if you will) through
>the VR to be spotty at best.  To correct it, I usually have to bounce my
>VR, it's like it just stops passing traffic.  This is happening in both
>of my Cloudstack environments.  Second, running a single nameserver is by
>no means acceptable in any environment.  I wouldn't do it in my dev,
>test, or stage environments let alone my production environment.  We also
>specify additional parameters in /etc/resolv.conf like timeout and we
>have to be able to specify additional search domains.
>
>
>On Nov 7, 2012, at 6:07 PM, Chiradeep Vittal
><Chiradeep.Vittal@citrix.com> wrote:
>
>> Not sure what you mean by #2. Do you mean that you set the global
>> configuration flag use.external.dns ?
>> If so, what is the content of /etc/resolv.conf ?
>> 
>> Why is the DNS forwarder not working for you? Is your zone dns
>>configured
>> correctly in CloudStack?
>> 
>> On 11/7/12 4:06 PM, "Caleb Call" <calebcall@me.com> wrote:
>> 
>>> #2 doesn't work.  It still stomps /etc/resolv.conf with what's provided
>>> by the routervm.
>>> 
>>> On Nov 7, 2012, at 4:48 PM, Caleb Call <calebcall@me.com> wrote:
>>> 
>>>> Thanks, #2 looks perfect.  I'll give that a shot.
>>>> 
>>>> On Nov 7, 2012, at 4:29 PM, Chiradeep Vittal
>>>> <Chiradeep.Vittal@citrix.com> wrote:
>>>> 
>>>>> That should not be necessary. The DNS server in the router is a
>>>>> forwarder:
>>>>> 1. If the target of the DNS resolve is for a VM it has served DHCP
>>>>>to,
>>>>> it
>>>>> responds with the entry
>>>>> 2. If not, it forwards it to the 'zone' dns server.
>>>>> 
>>>>> Or, you can set use.external.dns to 'true', restart the management
>>>>> server
>>>>> and restart (from the api/ui) the virtual router.
>>>>> But if you do, you won't get #1.
>>>>> 
>>>>> On 11/7/12 3:12 PM, "Alex Huang" <Alex.Huang@citrix.com> wrote:
>>>>> 
>>>>>> In 4.0, what I would do is this.
>>>>>> 
>>>>>> - Write a plugin.
>>>>>> - Listen to vm start events.
>>>>>> - On router vm start, ssh into the router vm and change the
>>>>>> resolv.conf
>>>>>> 
>>>>>> In the next release, Murali have added proper external event system
>>>>>> then
>>>>>> you don't even need to do this via a plugin.
>>>>>> 
>>>>>> --Alex
>>>>>> 
>>>>>> -----Original Message-----
>>>>>> From: Caleb Call [mailto:calebcall@me.com]
>>>>>> Sent: Wednesday, November 07, 2012 3:06 PM
>>>>>> To: cloudstack-users@incubator.apache.org
>>>>>> Subject: Re: alter resolv.conf nameservers on linux
>>>>>> 
>>>>>> Good question, I've been meaning to ask this same thing and keep
>>>>>> forgetting to.  I think I've read that you have to edit the config
>>>>>>on
>>>>>> the
>>>>>> router vm, but that doesn't persist a reboot of the router vm.  Is
>>>>>> there
>>>>>> a better way to do this?
>>>>>> 
>>>>>> 
>>>>>> On Nov 7, 2012, at 3:18 PM, "Musayev, Ilya" <imusayev@webmd.net>
>>>>>> wrote:
>>>>>> 
>>>>>>> How would I pass on my nameservers in resolv.conf of an instance,
>>>>>>> instead of router vms IP?
>>>>>>> 
>>>>>>> As of now, my nameserver is set to ip address of router vm.
>>>>>>> 
>>>>>>> 
>>>>>>> Thanks
>>>>>>> ilya
>>>>>> 
>>>>> 
>>>> 
>>> 
>> 
>


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