howto: keep serving from cache after TTL if servers down ?
seandarcy2 at gmail.com
Fri Nov 23 16:25:15 UTC 2018
Thanks for the prompt reply. Exactly what I needed.
On Fri, Nov 23, 2018 at 11:02 AM Wouter Wijngaards via Unbound-users
<unbound-users at nlnetlabs.nl> wrote:
> Hi Sean,
> On 23/11/2018 16:56, Sean Darcy via Unbound-users wrote:
> > I'm running a voip application, asterisk, that dies if it can't
> > resolve the addresses for its SIP registrations. Importantly there are
> > other connections, PSTN, that work even if the internet connection is
> > down. Also, I want the app to stay alive so that it can reconnect to
> > the SIP servers once the internet comes back up. For whatever reason,
> > asterisk itself will not have a fix for this.
> > I have unbound working on the machine. I'd like to have unbound serve
> > an address from its cache even if it's beyond the ttl IF it can't
> > refresh the address. In other words, just serve the stale address
> > until it can be refreshed.
> > Any way to do this ?
> serve-expired: yes in unbound.conf serves stale data.
> It is good to also enable prefetch: yes. Then unbound tries to refresh
> data that is about to expire, whilst serving the existing data.
> You can fine-tune it with the serve-expired-ttl and
> serve-expired-ttl-reset options if you want. But you can just leave
> those at the defaults.
> Best regards, Wouter
> > sean
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