Thanks Susan for the reply. Can I get some help on dns failover settings. Basically if dns server return multiple A records, how can I setup ATS to select alternative IP address in case first IP address is not accessible.
Thanks ~S On 29 May 2018 at 20:19, Susan Hinrichs <shinr...@oath.com.invalid> wrote: > We need to file an issue on getting these documented. Judging from "git > blame" . the failover settings have been around for quite a while. I > cannot help you much with the failover settings, since I haven't worked in > that area. > > I can help you on some of the other settings since Fei and I have been > digging through here recently. > > proxy.config.dns.max_dns_in_flight Controls how many DNS requests are > allowed to be outstanding. If this limit is reached, further requests will > be delayed until some responses arrive. I think this is a per thread limit. > > proxy.config.dns.lookup_timeout The timeout in seconds on a DNS request. > > proxy.config.dns.retries Number of times ATS will retry a DNS request. > > proxy.config.dns.local_ipv4 > proxy.config.dns.local_ipv6 Specify the source address ATS uses to make DNS > requests. NULL will pull the IP address from the interface > > > > > > > On Mon, May 28, 2018 at 7:34 PM, gksa...@gmail.com <gksa...@gmail.com> > wrote: > >> >> >> On 2018/05/25 16:27:08, salil GK <gksa...@gmail.com> wrote: >> > Hello >> > >> > I have a ATS ( 6.2.2 ) deployed in my server for Forward proxy. My >> > deployment is as follows >> > >> > >> > client -> ATS-1 -> ATS-2 -> "Origin server” >> > >> > Here between ATS-1 and ATS-2 I have created ssh tunnels and >> > traffic will be passed through that tunnel, using parent.config. >> > >> > ATS-1 is opening a MTLS socket to client and "Origin server" is https >> > >> > I have some questions regarding the capability of ATS. >> > >> > 1. From ATS-2 there will be a dns A query and get the address resolved >> > before connecting to "Origin Server” >> > If dns server return 2 or three addresses, is there any way >> > ATS use the alternative address ( second or third ) in case it fails >> > to reach first address ? How dns resolution works in ATS, is the dns >> > functionality embedded in dns or it allow the system to resolve the >> > address ? >> > >> > 2. I have a cluster of ATS-2 ( two ATS-2 machines.) in my >> > parent.config I have specified these two ATS-2 machines and >> > round_robin parameters is set to true. From document, I guess the >> > round_robin will happen if request come from different IP addresses ( >> > ? ). All requests come from same IP address will take same parent >> > machine only. Is there any way I can have round robin in place even >> > for requests come from same IP address ? >> > >> > 3. Is there any chance that http connection to origin server from >> > ATS-2 can be made persistent. >> > >> > 4. Since this is multi hop deployment I need to handle error >> > condition in ATS-1 and ATS-2 gracefully. So based on the HTTP response >> > code, I would like to put some logic for handling this. For example, >> > if an error is returned from the origin server, or if there is any >> > network issue between ATS-2 and origin server, I need to handle it in >> > ATS-1 ( logging or try another ATS-2 etc ). How do I achieve this ? >> > >> > >> > Any help on this would be of great help for me. >> > >> > Thanks >> > ~S >> > >> >> While searching in the web, I have seen some configuration variables >> related to dns >> >> proxy.config.dns.failover_number INT 5 >> proxy.config.dns.failover_period INT 60 >> proxy.config.dns.local_ipv4 STRING NULL >> proxy.config.dns.local_ipv6 STRING NULL >> proxy.config.dns.lookup_timeout INT 20 >> proxy.config.dns.max_dns_in_flight INT 2048 >> proxy.config.dns.retries INT 5 >> >> Where do I get the document related to these parameters ? >> >> This is a bit urgent issue for me to resolve this issue. It would be of >> great help if I get some directions on this. >> >> Thanks in advance >> ~S >>
