[GTALUG] Cache DNS issues.

[James Knott]

On 11/25/2014 11:08 AM, William Muriithi wrote:
> ‎Morning, 
>
> I have cache dns running on a postfix based mail server. The bin‎d server do come up before postfix, but dns queries fail till the dns master come up.
>
> Doesn't slave servers keep data persistent? I mean, is it normal for slave to fail resolving queries on start up if the master us down?
>
>

What's your cache time?  A cache will typically hold the data for a
short time, to keep stale data from propogating.  It might be as short
as a few minutes.  A cache certainly won't survive a reboot.