Re: [SOGo] DNS A record round robin
Am 09.11.2022 schrieb "Odhiambo Washington" (odhia...@gmail.com) : > You can have this load-balancing implemented if you wanted, probably > even locally on the host We have SOGo 2 on RHEL6 without systemd-resolved, load balancing works. On our SOGo 5 on RHEL 8, also without systemd-resolved, it doesn't work. Our nameservers are in resolv.conf and they do round-robin by randomly sending the responses. Our DNS is finde, I tried it.
Re: [SOGo] DNS A record round robin
As sogo does not resolve by itself the hostname, I'd recommend setting up your resolver to return the records accordingly. This can be also done on a per-host basis. E.g. by configuring systemd-resolved (which randomizes) or unbound (which defaults to round-robin) locally on the host via resolv.conf. Nicolas Am 08.11.22 um 12:42 schrieb Marco Moock (marco.mo...@urz.uni-heidelberg.de): Hello, at work we have 2 IMAP servers. There is a hostname with 2 A records. Does sogo do DNS round-robin by using them randomly or does sogo use just the first and only uses the second if the first is unreachable? Currently the requests only go to the machine listed in the 1st A.
Re: [SOGo] DNS A record round robin
On Tue, Nov 8, 2022 at 8:59 PM Marco Moock wrote: > Am 08.11.2022 um 18:48:47 Uhr schrieb Odhiambo Washington: > > > Well, this is something that you can check from SOGo's logs. If you > > gave it that name as the IMAP server, > > you can check on the logs to see the IP address it is making a > > connection to. > > It currently only connects to the server in the fist A record (no > set, our admins haven't already set up IPv6, sadly). > You can have this load-balancing implemented if you wanted, probably even locally on the host running SOGo. dnsdist, haproxy, traefik all come to mind. You just need a TCP load balancer. -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", egrep -v '^$|^.*#' ¯\_(ツ)_/¯ :-)
Re: [SOGo] DNS A record round robin
Am 08.11.2022 um 18:48:47 Uhr schrieb Odhiambo Washington: > Well, this is something that you can check from SOGo's logs. If you > gave it that name as the IMAP server, > you can check on the logs to see the IP address it is making a > connection to. It currently only connects to the server in the fist A record (no set, our admins haven't already set up IPv6, sadly).
Re: [SOGo] DNS A record round robin
On Tue, Nov 8, 2022 at 6:36 PM Marco Moock wrote: > Am 08.11.2022 um 16:48:53 Uhr schrieb Odhiambo Washington: > > > SOGo is not a load-balancer. > > SOGo daemon only listens and responds to what the web server requests > > of it. > > I talked about the connection to the IMAP server. Does sogo do any load > balancing there is it is possible, e.g. because multiple A, or > CNAME are set for the DNS fo the IMAP server? > Well, this is something that you can check from SOGo's logs. If you gave it that name as the IMAP server, you can check on the logs to see the IP address it is making a connection to. I will leave the definitive answer to the developers to talk about how the DNS libraries behave :) -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", egrep -v '^$|^.*#' ¯\_(ツ)_/¯ :-)
Re: [SOGo] DNS A record round robin
Am 08.11.2022 um 16:48:53 Uhr schrieb Odhiambo Washington: > SOGo is not a load-balancer. > SOGo daemon only listens and responds to what the web server requests > of it. I talked about the connection to the IMAP server. Does sogo do any load balancing there is it is possible, e.g. because multiple A, or CNAME are set for the DNS fo the IMAP server?
Re: [SOGo] DNS A record round robin
SOGo is not a load-balancer. SOGo daemon only listens and responds to what the web server requests of it. On Tue, Nov 8, 2022 at 4:38 PM Marco Moock wrote: > Hello, > at work we have 2 IMAP servers. There is a hostname with 2 A records. > Does sogo do DNS round-robin by using them randomly or does sogo use > just the first and only uses the second if the first is unreachable? > Currently the requests only go to the machine listed in the 1st A. > > -- > kind regards > Marco > -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", egrep -v '^$|^.*#' ¯\_(ツ)_/¯ :-)
[SOGo] DNS A record round robin
Hello, at work we have 2 IMAP servers. There is a hostname with 2 A records. Does sogo do DNS round-robin by using them randomly or does sogo use just the first and only uses the second if the first is unreachable? Currently the requests only go to the machine listed in the 1st A. -- kind regards Marco
