Hello, I'm having a frustrating issue here, and i cant find a viable solution after searched howtos for a month... My setup is as follows : i have 2 server, with 2 different public IP addresses. I'm running BIND on both of them, and i did setup them according the http://www.howtoforge.com/traditional_dns_howto as follows: 1 slave and 1 master. I dont want to make load balancing between them, and also i want to make a "failover" situation. I dont know if this is the corret term. Basicly, if one server is down [ having no internet connection] i want to redirect all users who access my website to the other server who is already mirroring the content. And i want to do this with BIND, because i dont have the resources to use a hearthbeat server. I found that i can use SRV options, to make a load balancing and a failover situation. and my setup looks like this : [ the domain and ips are changed ] Code: [the SOA thing ].. $TTL 28800 @ IN NS ns1.example.org. @ IN NS ns2.example.org. example.org. A 192.168.0.1 ns1 A 192.168.0.1 ns2 A 172.16.10.1 $TTL 84 _http._tcp.www.example.org. IN SRV 0 1 80 www.example.org. IN SRV 1 1 80 www2.example.org. www.example.org. IN A 192.168.0.1 www2.example.org. IN A 172.16.10.1 The problem is if i stop apache / bind on 192.168.0.1, and i flush dns records on my computer, when i try to access http://www.example.org i get Connection timed out , but no redirection. Knowing this, can you give me any ideea, or a link to a resource i can consult ? Everywhere i go, it says the same thing : use SRV records and it works 100%. But in my case, it doesn't. Also, I am interested in any possibility to do what i want to do. I can modify the nameservers pointing to my servers in the Root NS. Thx a lot for reading, Dan
DNS is a bad solution for HA setups because DNS records are almost always cached, so you can never be sure what answer a client gets for a DNS query (even if it's working for you).
But what if i set the TTL for let's say 60s? I made a research on google NSs, they have set TTL for 84s, and they are using round robin DNS, with 4 ips. And speaking of this, isn't round robin a form a load balancing ? I'd use that method if it wasn't 1 problem : the round robin thingy cannot control whether the server is "dead" or online.. Supposing we don't get cached, is there any method i can make what i want ? Thx, Dan
That doesn't help you if other name servers don't care about the TTL and use a caching mechanism. There are lots of caching nameservers out there.
