0
votes
1answer
11 views

Supporting writes on bind9 failover

I want to set up a redundant DNS based on Bind9, including failover for write operations. I have DHCP dynamically update DNS based on client hostnames, and I need this functionality to continue to ...
1
vote
2answers
59 views

Windows Server 2008 DNS Forwarder Failover

When setting up and testing DNS forwarders I am finding that if the primary is unreachable 2008 will still try it for every query before trying the secondary. The default timeout before querying the ...
1
vote
0answers
87 views

Dreamhost DNS to AWS Route 53

I'm looking to setup DNS failover for config.webconverger.com and I think Route53 is the best option to get it going. However I'm confused how to export the DNS zone from Dreamhost to Route 53, ...
1
vote
2answers
51 views

Multiple DNS servers for website failover

I know this is a bad "solution", if its even one, but due to the circumstances I think it fits. If Server A runs ns1.example.com and Server 2 runs ns2.example.com and both are hosting an exact ...
1
vote
0answers
33 views

Failover web hosting with multiple NS

Are there any drawbacks in having each nameserver entry in a domain name point to different failover server? In this setup, the same DNS server will also serve the content - so if it's down, the ...
1
vote
2answers
408 views

Failover for server with dual WAN

I have one mail server, one SonicWall firewall, two Internet providers, and an internal DNS server. I have WAN failover set up on the SonicWall so in the event that the primary connection is down ...
0
votes
2answers
37 views

DNS failover in virtual network

I have read some articles here and on other websites about the drawbacks of using DNS to implement high availability services. This is mostly due to the fact that configuring DNS to work efficiently ...
0
votes
1answer
64 views

Ip-failover and geolocalization

I have a server (from OVH) located in France with French ip. However most of the people coming to my website are from Poland. From what I read having a Polish ip address could lead to better search ...
2
votes
1answer
73 views

Performance penalty when using CNAME

We are using the current CNAME record for a server, i.e. foo.example.com => CNAME => server1.example.com server1.example.com => CNAME => ec2-34-142-138-31.compute-1.amazonaws.com ...
3
votes
3answers
1k views

A-Record Failover?

I have a Fortigate 100D with 2x BT Business Infinity Fibre connections acting as WAN1 & WAN2. The BT lines come with 5 static public IPs each and I have my DNS hosted through CloudFlare pointing ...
1
vote
2answers
427 views

One website, two public IPs, each IP on separate line, how to do failover

We have a website that sits behind two firewalls, main and failover. Main and failover firewall have different IPs, and different Internet connections from different providers. How to provide failover ...
2
votes
3answers
113 views

Achieving Five Nines

I am building a web application where uptime is key. I understand that 100% uptime is not realistic but I would like to achieve five nines. I'm unsure as to the most prudent way to accomplish this. ...
0
votes
1answer
152 views

Using Amazon route53 for high availability

Using Amazon Route53 DNS, is it possible to build a highly available setup pointing to multiple web servers not on Amazon? I don't need to worry about session stickyness. Let's assume I have two web ...
1
vote
1answer
305 views

DC/DNS failover with global/common DNS roundrobin

I think I am getting lost in network failover land. I am trying to set up a Windows Domain Controller and DNS, while providing resilients and failover. I have two Domain Controllers and DNS servers. ...
1
vote
2answers
133 views

What is a reliable device to detect, from the outside, if my internet connection has gone down?

We host some web sites on servers in our office. We have two internet connections, a primary and a backup connection (with separate IP address ranges.) We need to be able to detect, from outside our ...
2
votes
2answers
146 views

Ways to do simple failover with one server and two IPs

The setup is one server (Windows 2008) at one location with two incoming connections. As the server has to interface with various on-site devices, and will have a small number of incoming ...
2
votes
3answers
1k 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 ...
3
votes
2answers
821 views

DNS Round-robin, Load Balancing, Load sharing, and failover in 2012

I have been reading many posts on serverfault as well as on other sites regarding all these. What I understand is, Multiple A records(round-robin dns) can be used for both : Load sharing ...
5
votes
3answers
2k 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 ...
2
votes
1answer
101 views

Failing back from DNSSec to regular DNS

A disaster recovery plan has been proposed in a client's company that would fail back from DNSSec to regular DNS in the event of 1) A major site outage requiring the change of many DNS records 2) ...
0
votes
3answers
270 views

Manage DNS outage

I have been using ZoneEdit to manage my DNS. This has been generally fine except I did have a half our outage where two of their DNS servers were down causing my site to be inaccessible. What is the ...
0
votes
1answer
585 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
1answer
903 views

DNS Failover when Datacenter is dead

I'm just trying to configure my DNS server to switch the DNS entry in my DNS server (bind) if a server becomes unreachable. Is there a simple tool that I can use to do so?
4
votes
4answers
2k views

DNS Round Robin: Do browsers stick to one IP as long as it is online?

How do most browsers behave if they get multiple A-records from the DNS server? Do the stick to one IP as long as it is reachable (and only use another if the IP is down)? Or do they switch all the ...
3
votes
2answers
2k views

How browsers handle multiple IPs

Can someone direct me to information on exact browsers behavior when browser gets multiple A records for a given hostname (say ip1 and ip2), and one of them is not accessible. I interested in EXACT ...
1
vote
3answers
511 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 ...
3
votes
2answers
2k views

Can I point my DNS to nameservers of different web hosts?

I was told that the DNS for my domain is unreliable, so basically I was wondering Could I set my secondary DNServers that points to another webhost altogether ? : ns01.host-FOO.com ns01.host-BAR.com ...
1
vote
1answer
177 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 ...
4
votes
1answer
1k views

DNS Failover with multiple Nginx load balancers

Our application is hosted on EC2, however because the nature of the app, it requires extremely high availability. We have an image of the app running on Linode as a failover. However, doing a DNS ...
2
votes
1answer
2k views

Configuring Secondary DNS to Work if Primary is down (Bind)

I have a master slave DNS server setup with bind. The secondary DNS server is working correctly and resolves any queries sent to it. However, when the primary DNS is down, it seems that the secondary ...
0
votes
3answers
371 views

Redundancy with DNS records

The firm that I work for has 2 ADSL lines into the office. We have a domain office.ourfirm.com which we would like to be able to reach our network server on. One of ADSL connections is already a DNS ...
1
vote
4answers
299 views

Fail-safe web hosting

I work maintaining a SaaS software we have developed in-house, and it really can't be offline. Being offline will upset most of our clients and most probably will result in some contracts being lost. ...
2
votes
3answers
372 views

Looking for a DNS Hosting provider with automatic failover and role switching

I need to set up automatic failover with two SQL Server Instances and mirroring. There are several DNS hosters (such as DNS Made Easy and Netriplex) out there providing automatic failover. The are ...
2
votes
2answers
373 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 ...
0
votes
1answer
162 views

DNS server failover [duplicate]

Possible Duplicate: How can I automaticaly change the DNS A record to point my site to a secondary server in case of a failure? welcome we have MS records for our domain in ISP DNS server ...
2
votes
4answers
5k views

DNS Round Robin: Multiple Nameservers VS Multiple A Records?

Note: This is a follow-up to my previous question regarding DNS Failover. The Goal: to make the client's web browser select the next available server if one is down instantly. I've read somewhere ...
1
vote
1answer
598 views

“Simple” Failover to a Geographically Separated Server?

I've been reading about DNS failovers and a bunch of other technical terms however I'm a bit of a newbie in this so it all sounds Greek to me. Basically here's what I just need: I have two shared ...
2
votes
2answers
2k views

Browser-based DNS failover using multiple A records

It has recently come to my attention that setting up multiple A records for a hostname can be used not only for round-robin load-balancing but also for automatic failover. So I tried testing it: I ...
0
votes
2answers
1k views

Two Web Hosts, One Domain name, How to share the two?

I have a domain that's hosted on a server. I want to set up another server to sometimes serve up pages instead of the pages on the first server. How do I set this up? I guess it's similar to a ...
0
votes
4answers
253 views

redirect traffic to www.example.com through DNS from example.com

I have a bit of a unique problem. for the domain (example.com) I want people to go to www.example.com however I'm also throwing GSLB into the mix. for GSLB the devices(one in each datacenter) need to ...
1
vote
6answers
2k views

Alternatives to DNS round robin

Sorry for being unclear previously. We have a vmware virtualized server instance that is our main production server. I stores a series of web based applications on close to a hundred unique top level ...
1
vote
1answer
784 views

How to configure the timeout that ping uses to resolve a hostname with first and second name servers

According to the man page for resolv.conf, I should be able to specify a few options for how the resolver will resolve a given hostname for lookup: http://linux.die.net/man/5/resolv.conf I know my ...
1
vote
3answers
822 views

Best Practice - Setting up 2 AD intragrated DNS servers for internal network

Windows 2003 functional level domain which includes... 2 windows 2008 Domain Controllers with integrated DNS serves, one of the 2 servers is a RODC. DHCP is giving our both IP address of DNS servers. ...
0
votes
1answer
879 views

failover dns not working and not sure how to troubleshoot

On my domain i've got a w2k8 standard domain controller and a w2k8R2 domain controller. I recently added dns to the w2k8R2 server in an attempt to set up a failover/secondary dns but it is not ...
2
votes
3answers
2k views

Using a low TTL to help prevent extended periods of downtime

Is it feasible to set my domain's TTL to a very low value (a couple of minutes) so that, if my main host goes down for an extended period of time, I can update the DNS records in my main host to point ...
0
votes
3answers
983 views

Redundant DNS setup

I have a problem with my DNS setup and I really can't understand what's wrong with it. We host our own public DNS servers on 2 different networks (technically, we have 3 DNS servers on 3 different ...
1
vote
3answers
758 views

Fallback website domain IP configuration

I want to know whether it is possible to configure website DNS (In Godaddy) to use two IP address. If the first one does not work, it has to take the second one. I want to setup my Blog, email ...
3
votes
6answers
2k views

How do I set up failover for a single web server using two ISPs?

I have one web server and two WAN connections (1 cable, 1 DSL). DNS is run offsite, and points to the IP address assigned by one of the ISPs. How can I have the second connection take over when the ...
0
votes
1answer
397 views

Amazon EC2 Failover Solution

Does anyone know of a service that will run a DNS heartbeat check then turn on an ec2 machine and forward all requests to that machine if the original(non-ec2) hosted solution goes down? If not is ...
8
votes
3answers
779 views

Global high availability setup question

I own and operate visualwebsiteoptimizer.com/. The app provides a code snippet which my customers insert in their websites to track certain metrics. Since the code snippet is external JavaScript (at ...