Linked Questions

53
votes
11answers
14k views

Multiple data centers and HTTP traffic: DNS Round Robin is the ONLY way to assure instant fail-over?

Multiple A records pointing to the same domain seem to be used almost exclusively to implement DNS Round Robin as a cheap load balancing technique. The usual warning against DNS RR is that it is not ...
5
votes
3answers
3k views

If DNS Failover is not recommended, what is?

As a followup question to his very popular question: Why is DNS failover not recommended?, I think it was agreed that DNS failover is not 100% reliable due to caching. However the highest voted ...
5
votes
3answers
1k views

Is round-robin DNS a possible solution for high availability?

Let's say I have 2 IPs for a given domain (round-robin DNS). If one the IPs becomes unresponsive, will clients try to connect to the other IP? or they will just fail to establish comunication with the ...
2
votes
3answers
3k views

How use DNS server to create simple HA (High availability) of my website?

Welcome, How can i use DNS server to create simple HA (High availability) of website ? For example if my web-server ( for better understanding i use internal IP in real it will be other hosting ...
2
votes
5answers
1k views

How can I serve a static landing page if my server is down?

I would like to fallback to a static webpage if my main web server is down (currently a Rackspace Cloud instance). This would be a sort of worse-case scenario that shouldn't happen, but has before ...
2
votes
4answers
1k views

Statically mirroring a heavy trafficked site, CloudFlare as DNS

I run a fairly heavy trafficked website and due to some unfortunate incidents the machines that are in my cloud at Linode went down. And I have only a single Load Balancer machine exposed to the ...
6
votes
3answers
538 views

Apache availability with the two front-ends on diferent locations. Is it possible?

I have to locations (office and service providers). One DNS(bind) serving our domain as authoritative, and a service provider webserver with our corporate web on a private server. So.. Now we are ...
2
votes
2answers
2k views

DNS failover across multiple datacenters?

I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all ...
2
votes
2answers
396 views

Is it possible to completely avoid a single-point-of-failure in a web back-end?

It seems like you're always dependent on some hosting provider being available. Even if you servers are geo-redundant across data centers, you still have a DNS record that points to some IP address ...
3
votes
3answers
270 views

Dual external internet connections

We have here 2 Internet connections coming in. And the intention is to have all services available on our server which should be available externally, to be available through both connections. Also, ...
1
vote
1answer
299 views

How could dynamic DNS work if DNS updates take hours to propagate?

Simple Failover markets itself as: continuously monitors your servers to find out which are up and which are down, and then it dynamically updates your DNS records accordingly so that your ...
1
vote
3answers
552 views

Can DNS do failover switch for a domain?

I have heard about round robin solution. But that one is making different request to different ips to do load balancing. What I want is making one IP as master, only if it dies, the DNS server switch ...
0
votes
1answer
680 views

DNS failover in a two datacenter scenario

I'm trying to implement a low-cost solution for website high availability. I'm looking for the downsides of the following scenario: I have two servers with the same configuration, content, mysql ...
2
votes
2answers
167 views

How can one domain route to an always-changing pool of servers?

I'm sure this is an easy solution, I'm just not too familiar with how DNS works or if that's even related to this problem. If I'm running a web service on amazon ec2, distributed across many ...
-1
votes
3answers
214 views

What's the best solution for 99.999% Up-time to end users? [closed]

I'm looking for a solution to make sure my site stays accessible as much as possible on a long term basic, what i might need is just a simple DNS management solution (I don't know but i would like ...

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