BTW, The lua configuration will only deliver the list of the servers available for the new queries. For example, let imagine you have the 3 registers www and a TTL of 1 hour:
- One client makes a query for the www register and will store it locally for 1 hour - 5 minutes later, one of your servers goes down. - the PDNS will now only respond to the www queries with the 2 available servers/IPs. - but the first client, will maintain the 3 IPs/servers on it cache - the client browser will then try to connect to one of your servers, but if it is unavailable, it will try the next one - after 55 minutes more, the first client will ask again for the www register and then will get only the 2 available servers/IPs. So, you can reduce the TTL of the www register from 1 hour to 60 or 30 seconds and try to reduce/eliminate this "dead connection" on the client side, "but" with these change you will increase the queries that the clients are doing to the DNS servers. ;-/ you need to pick one !! :-D Salu2 On Tue, 26 Sept 2023 at 19:37, Victor Hugo dos Santos <listas....@gmail.com> wrote: > > Hello there, > > you mean, something like this: > https://doc.powerdns.com/authoritative/lua-records/index.html > > Anyway, you don't need it for http protocol, because it is included by > default in almost all the browsers (rfc8305 if I remember well), so, > you only need to create the registers: > > www IN A 1.1.1.1.1 > www IN A 2.2.2.2.2 > www IN A 3.3.3.3.3 > > and it will create a round robin for you on the DNS server and if the > web server on 1.1.1.1 is down, the client will automatically use the > others servers. > > Note: There is a small performance, because the browser will need to > contact the next server if the first is down. > > Salu2 > > On Tue, 26 Sept 2023 at 18:43, Riccardo Brunetti via Pdns-users > <pdns-users@mailman.powerdns.com> wrote: > > > > Hello everybody. > > I'm trying to figure out if it is possible to make pdns (or dnsdist) to > > return a different answer according to the availability of a service. > > Suppose we have: > > > > - server A with IP: XXX.XXX.XXX.XXX > > - server B with IP: YYY.YYY.YYY.YYY > > > > Server A and B are two web servers which are configured to answer to a > > given http GET like http://myservice.net. > > They are both configured in the same way and are independent. > > > > I would like the DNS query to return XXX.XXX.XXX.XXX as long as the server > > A is working (returns 200 to the GET) or return YYY.YYY.YYY.YYY when server > > A is not working. > > In other words, I would like to have two records A for myservice.net with a > > somehow "intelligent" behavior and not a simple round-robin. > > > > Can you suggest me how to achieve this, if it's possible? > > > > Thanks a lot > > Riccardo > > > > > > _______________________________________________ > > Pdns-users mailing list > > Pdns-users@mailman.powerdns.com > > https://mailman.powerdns.com/mailman/listinfo/pdns-users > > > > -- > -- > Victor Hugo dos Santos > http://www.vhsantos.net > Linux Counter #224399 -- -- Victor Hugo dos Santos http://www.vhsantos.net Linux Counter #224399 _______________________________________________ Pdns-users mailing list Pdns-users@mailman.powerdns.com https://mailman.powerdns.com/mailman/listinfo/pdns-users
