multi-master with mysql backend

fddi fddi at
Sun Feb 13 16:06:45 UTC 2011

I do not know why you really don't liket this mysql solution.
OK I am talking of a DNS for HA purposes for grid computing services for 
exampe, so DNS
resolution must be always working at any cost.
The David solution can be OK, but I want to be sure not to have issues 
with serial numbers on the two servers
and the mysql solution looks safer to me. You do not have to rsync 
anything, just have mysql properly configured.


On 2/12/11 11:33 PM, Doug Barton wrote:
> On 02/11/2011 01:51 PM, fddi wrote:
>> I understand you, but the advantage of having mysql backend is that
>> if one of the two servers dies, the other keeps running with up to
>> date informations, and can also be updated wit new informations. When
>> the  other server comes up again it will automatically sync itself
>> using mysql replica mechanism. if I use file backend I have to
>> manually sync it, and how to keep tracks of modifications ?
>> for this I choose mysql backend
> Two questions, how often do you anticipate one of the masters failing, 
> and how much data are you talking about? Generally the number of times 
> a server fails is going to be pretty small, if it's not, you've got 
> bigger problems.
> If you're not talking about a huge amount of data here (and from what 
> you've described in previous posts, you're not) then you are fairly 
> dramatically over-architecting your solution here. Personally I think 
> David had a great idea in regards to using nsupdate to update both 
> masters at the same time. If you really think that one of them is 
> going to fail often enough to justify an automated solution than 
> scripting something that utilizes rsync shouldn't be too hard.
> hth,
> Doug

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