Impementing Failover

Jul 8, 2007

I was wondering what sort of systems have you guys implemented for ensuring your website remains online.

Iv attached a pic of what I think are the best options.

What do you think?

Also, am I correct in my assumptions about DNS?

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DNS Failover

Mar 26, 2009

I want to add a DNS Failover automated service at my server, in order that when it goes down, the DNS Failover enters in action and it will redirect all the traffic to a second backup/failover server (hosted at a different location).

So in order to do this i have been looking around and i have found dnsmadeeasy, and i found their offer interesting.

But i still have some question and doubts on how a dns failover service works. So maybe someone can expalin it to me.

My question and doubts:

1 - If i use for example the DNS failover from dnsmadeeasy, i would have to buy 2 servers where one is the principal server and the other is a backup/failover server, so when my main server goes down, the dnsmadeeasy will detect in a automatic way, and redirect all the traffic to my backp/failover server. After my principal server goes back online, dnsmadeeasy will automatic redirect all the traffic to the principal server.

Im i correct? Or i understound wrong how this works?

2 - I use my own Nameservers and i want to continue to use my own nameservers. So if i use dnsmadeeasy services, i will be able to continue to use my nameservers as ns1/ns2 and then i will add the dnsmadeeasy ns3/ns4...as the following example:
ns1.mynameservers.com
ns2.mynameservers.com
ns3.dnsmadeeasy.com
ns4.dnsmadeeasy.com
ns5.dnsmadeeasy.com
ns6.dnsmadeeasy.com

Correct?

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Failover Or Not

Apr 4, 2009

I am planning to rent 2 managed dedicate servers with windows server 2008 and ms.sql 2008.
which I will use one for web application and 1 for database server.

why people usually divide them into web and database server? is it for security or performance reason?

Which one you prefer to choose?

- 1 server for web and 1 server for database.
or

- 1 server(web and database) and 1 server for failover

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Failover

Aug 4, 2007

In making my plans for my web hosting business I plan to start, I've thought about a failover but wanted to know the best way to set it up.

I would ideally like to start with something like getting a small shared hosting solution (not reseller, just shared) at a reliable hosting company. On this hosting plan, I will host a simple 1 page site that says my company is having technical difficulties, reminds people that data is safe, and provides any contact information accessable (like e-mail/phone/etc...).

I already have DNS setup offsite.

I would like that if my server(s) go down for any reason, whatsoever, that DNS automatically starts serving the temp site.

so if my server suddenly goes down, [url]or [url]suddenly goes to the offsite shared hosting plan.

This would not provide customer site redundancy. This would only ensure that if anything happens to my service, customers have a page available that explains what is happening and has information to contact us to get more details.

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PIX Failover, Serial Or LAN?

Jul 11, 2008

We have 2 Cisco PIX 515's in a failover configuration (7.1 series IOS). We have available both a serial failover cable and adequate switch capacity to allow using either the serial or LAN-based approach. We have no current plans to locate the firewalls physically apart.

We have plenty of info on how to configure either, but no recommendation on which is the better choice.

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Web Hosting Failover

Feb 21, 2009

I have a reseller account with a company that often has spontaneous DNS errors, and this, as you know looses us money. I also have a dedicated server running a panel exclusively via IIS. Is there a way I can set up my dedicated (Windows) box and my reseller account in a mirror way, so if one of them fails, the other will take over.

There are no file changes often, more database then anything. Is this possible?
Main necessities are:

-Mail Servers

-MySQL Servers

-PHP5

-Cron jobs

(Or, if a shared hosting company can accommodate this somehow and is relatively inexpensive.

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Failover Server

Jul 17, 2008

I host my own server but need to get a failover server in the case it goes down. Does anyone know of any companies that host failover servers that will run off my own server?

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DNS Failover/Redundancy

May 1, 2008

Basically have 2 hosting accounts at different providers...each set-up for the same domain name...and then somehow wtih DNS make it so if host #1 goes down traffic goes to host #2 (which would basically be a splash screen explaining that host #1 is down and will be back soon).

DNS isn't my strong point, but I do know you can do this with MX records...so if the first server fails it tries the next until it gets a working one or reaches the end of the list. I'd just like to do it is A records.

It wouldn't be as simple as setting the nameservers like this would it?

ns1.host1.com
ns2.host1.com
ns1.host2.com
ns2.host2.com

Would it use the host1 nameservers as long as they're online, and if not failover to the host2 nameservers? If so, great, but what if the host1 nameservers are online but the server itself is not.

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DNS Failover Service

Dec 10, 2007

Assume, a DNS failover service would change the DNS from server 1 to server 2 when the first one is offline. This will be changed quite fast, however isn't it true that some visitors still experience a downtime of a couple of hours (saying that the main server will be offline for 6 hours) as their ISP might not update DNS that frequently?

So basically, what is the added value of a failover service?

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Secondary DNS Failover

Jul 22, 2008

What happens if your primary nameserver goes down? Meaning that it goes completely off the net, not even denying dns requests but completely ignoring them.

I'd guess that resolvers would query the secondary NS after a specified timeout, but what is that timeout set to? Does it differ from ISP to ISP? How much of a slowdown are we looking at for end users?

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Failover Server

Oct 26, 2007

I'd like to create a failover server, a complete and identical copy (as much as possible) of my primary server, which becomes "primary" when the first server dies.

I've been reading a lot about this subject and i've seen an already working method which uses rsync and MySQL replication.

Has anyone managed to create such a system? is there someone with experience or can point me to a relevant web site?

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MSSQL Mirroring / Failover?

Jul 8, 2008

I'm building the infrastructure for a live event site.

I have specced 8 app servers but I'm still unsure with regards to MSSQL.

The site functionality makes a single write to the DB with no reads. A simple option would be to have a MSSQL DB instance on each of the APP servers and simply collate the information after the event.

I've also been looking at the mirroring function of 2005 as it would mean we could get away with two MSSQL servers instead of 8.

Has anyone used MSSQL 2005 Mirroring? Is it easy to setup and maintain? Any caveats?

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How To Keep 2 Servers Synchronized (to Use Failover)

Apr 21, 2009

We want to provide failover service at our server using dnsmadeeasy service.

So we have already buy the "failover server" (running linux/plesk), and now we are looking to find the most adequate / best way in order to keep the 2 servers sincronized, in order that if "main server" goes down, all the traffic can be redirect to the "backup server" using dnsmadeeasy.

on scripts/software to keep 2 linux servers sincronized in a failover setup?

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MySQL Replication/Failover

May 24, 2008

I'm working for a client who has an e-commerce site currently hosted on a shared hosting solution.

He is now looking for 100% uptime (as near as), so I have suggested that we get 2 VPS and use DNS monitoring to switch servers as required (from DNSmadeEasy).

This is all fine, and the websites files/images do not change often, so I can use rsync every so often to sync these. Not a problem.

What does change frequently is the mySQL db for the site.

I've been looking at MySQL replication, but this seems to be no good. If one server goes down, then the other one takes over, they don't automatically sync themselves after they come back up. It seems MySQL cluster is best, but this needs 3 servers and they all need to be on the same LAN.

I've read you can set MySQL replication to MASTER-MASTER so that it acts like a cluster, and resyncs itself as required.

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How To Use Two Connections In A Failover Scenario

Jul 7, 2008

I was wondering if this is the right section.

Well my problem is, we have 2(ABC and XYZ company) internet connection and sometimes,
the ABC connection is not active and we're disconnected for about 2-4 minutes interval to get the XYZ internet connection online.

My question is - Is there a software that will automatically set the XTZ internet connection to active? Something like if the ABC connection is down, the XYZ will supply internet connection right away.

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Subdomain As Failover On Other Server

Jun 12, 2007

CentOS, LAMP, webmin.

I have ibeat.org running on one server.

Now I want to make a status subdomain on another server.

ibeat.org on one - status.ibeat.org on another.

I've edited the master zone on server one and added status.ibeat.org. and www.status.ibeat.org. ... and pointed it with A and CNAME to the other server and related IP...

I have also created the subdomain on the second server.

So my question is what should I do to get this working? This isn't!

I want to have a status link on the ibeat site ... and also:

... if server one with ibeat.org fails make it open status.ibeat.org?


Should be pretty simple - but can't get my head wrapped around it.

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Failover Or True Clustering

Oct 23, 2007

I have been searching and searching for a solution. We are currently using one single vps to host some of our clients. We are finding more and more that we need to have some redundancy.

I have looked at using DNS failover using RSYNC/mysql replication etc with two servers, but just dont like the idea.

I have also looked at hosts like imountain etc that use h-sphere. I dont like this setup because services are split onto single machines. For example mail is done on one single server, therefor if that server is down, mail is down.

What I am looking for:

I am trying to stay in a budget of 150/month or less.

I would like to get one of the two options here:

option 1: two vps's or dedi's that technically act as one(a true cluster) then on top of that is OS and control panel and done. This solution doesnt allow for whole datacenter outages, or network issues.

option 2: Two geographically placed vps or dedi's that are somehow either load balanced, or failover.

Ultimately our goal is to have high uptime, but we dont really have much server load.

Basically failover is ok as loads are always low anyway, but if we are paying big $$ it would be nice to have it load balanced.

Please let me know if my expectations are way to high or my price is way too low. I need to find a solution here somehow and if I cant find anything will most likely just go with DNS failover.

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Webserver Standby Failover

Jul 9, 2007

to do a standby fail over solution for a web server box. I would like the solution to be automated so that in the event of a failure the change happens without any manual intervention.

I have 2 identical hardware boxes and bandwidth is not an issue.

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Apache :: Mod Proxy With Failover

Jul 13, 2014

I have the following setup in my apache vhost:

Code:

ProxyPass /abc http://www.newest.com/
ProxyPassReverse /abc http://www.newest.com/

I want to setup a failover approach in which if after a particular timeout say 10secs the load shifts to some other website like Refer.com | The world. The timeout should be in Proxy Pass and if timeout occurs it shifts to Refer.com | The world

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Servers Failover With DNS Running On The Cloud

Apr 11, 2009

im looking to add failover protection at my main server, in order that if it goes offline, all the traffic can be in a automatic way redirect to a failover / backup server.

For the failover server i was looking to buy a low-cost dedicated server located in other datacenter and have my dns be run at this failover server, but now i have been looking at Cloud Hosting, like Amazon or Mosso CloudServers and as it seems a very stable network, im thinking if it will be best to have setup/running my DNS at a Cloud Host...

So what do you think it would be best:

Option A:
1 main server
1 failover dedicated server
1 cloud (amazon/mosso) virtual server to run DNS

or

Option B:
1 main server
1 failover dedicated server (running the DNS)

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Redundant Apache (failover System)

Sep 22, 2009

I currently own several servers: let's say sites on 3 of those servers rely on a website that sits on server 4

If server 4 goes offline, then servers 1 2 and 3 suffer a lack of usability.
The website on server 4 is very small and fast, but receives several hundred thousand visits a day

I figured it would be a good idea to replicate that website on each of my servers, but I'm unsure about how to set up a good redundancy system..

Using several nameservers doesn't work as expected (visitors are randomly sent to one of the nameservers, in no particular order)

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Failover Plan - If One Server Is Down, Pick The Second One

Apr 23, 2009

So, there is my example. I have two servers in different locations. First one is the main server with all the data and the second one has just simple notice like "We will be back soon".

Now, if I set the primary DNS server on main server and secondary DNS on second one (but with different A records), will users actually get the server two if main server is down?

Will this work or not? I want 100% access to the site, at least to the server with only notice (I don't need data from main server). I can set the round robin, but I don't need load balancing (actually I want access only main server), but just if main server is down to go on the second one.

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Cpanel DNS Cluster....for Simple Failover.

Oct 26, 2007

We have a 1 server setup. Right now all dns, web, and email are hosted from this single box.

We wish to bring in a server2 and have dns cluster setup, this would also host mirrors of email and web sites from server1.

What i want to know is what is the best way to setup the DNS cluster/nameservers?

would it be

ns1.domain.com pointing to server1 dns
ns2.domain.com pointing to server2 dns?

if that is the case and lets say server 2 goes down, wouldnt that mean the 50% of hits to the web site would be denied as ns2 is down? The reason i ask this is that to my understanding nameservers do not have priority, they are randomly hit.

I am trying to provide some small bit of redundacy.

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Failover Clusters? Network Load Balancing?

Jul 28, 2007

I have a server which runs some important apps. I want to provide as much availability as I can..in case the server goes done, another one to take the load.

The server is a Win 2k3 one.

I've looked over the net but I don't know which solution should I go for: a Failover clusters or a Network Load Balancing setup.

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Round-Robin Domain Name Server Failover

Jul 13, 2007

I am trying to do a fail over solution with round robin dns. Our dns is served by windows and our web servers are setup with Linux..

I know round-robin does not by default do a fail over, however my understanding is that a script can be used to remove the failed server for dns, is anyone aware of something that will do this for windows?

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Cheap Linux, Windows, FailOver Web Hosting

Apr 11, 2009

Cheap Linux, Windows, FailOver Web Hosting.

UA Speedy Host is a majorperformer of web hosting. We are providing quality web hosting at affordable price. We have given a new trend to web hosting business. Our web hosting packages cater needs of all sizes of companies. Why go for 100 MB or 500 MB or 1 GB web hosting packages as many web hosting companies offer when UA Speedy Host provides unlimited space at fraction of cost. You can compare us with other web hosting companies and you will find UA Speedy Host most competitive in all web hosting companies. UA Speedy Host is an ecommerce gate way for all sizes of companies.

To Know More Please Visit Below Link:

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General Features
General Features: Linux Package Windows Package Failover Package
Disk Space Unlimited Unlimited Unlimited

Bandwidth Unlimited Unlimited Unlimited

Free Domain
Domains Host Unlimited 1 1

Park / Alias Domains Unlimited Unlimited Unlimited

Sub Domains Unlimited Unlimited Unlimited

Hosting Panel Cpanel Plesk Plesk

Uptime 99.9% 99.9% 100%

To Know More Please Visit Below Link:

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Cheap Reseller Web Hosting Packages:

Our Reseller Web Hosting Account give you freedom to host unlimited domain at your own price and brand. Complete transparency in every aspect allows our each reseller to fulfill their services without the worry of being discovered as our reseller. All of this is designed so you can concentrate on selling and making money while we do all of the hard technical work behind the scenes.

As our reseller, you are free to resell each account under your own brand name and charge your customers whatever you want. This allows you to have the look and feel of your own hosting company. All resellers will can also create their own private name servers (ns1.anydomain.com & ns2.anydomain.com). All end user customers of the reseller will be using that assigned name servers.
Host Unlimited domains with complete security.
Website and E-commerce builder tools are included freely.

To Know More Please Visit Below Link:

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General Features: Linux Reseller Windows Reseller Linux + Windows Reseller

Disk Space Unlimited Unlimited Unlimited

Bandwidth Unlimited Unlimited Unlimited

Hosting Billing Software

Domains Host Unlimited Unlimited Unlimited

Park / Alias Domains Unlimited Unlimited Unlimited

Sub Domains Unlimited Unlimited Unlimited

Hosting Panel Cpanel Plesk Plesk+Cpanel

Uptime 99.9% 99.9% 99.9%

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Error While Connecting To MySQL. Failover Enacted

Jul 4, 2007

I have this problem with MySQL

Quote:

Error while connecting to MySQL. Failover enacted.

MySQL is Running and Working, how i can fix this problem?

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Report On Viability Of Domain Name Server (DNS) Failover Solution

Jun 22, 2006

I run a site with about 1,000,000 unique visitors per month and recents server failures made me decide to get a failover server to minimize downtime. My goal wasn't to get 99.999% uptime but to be able to be back on track after a failure in a "reasonable" amount of time. After evaluating several solutions, I decided to go with DNS failover. Here's how the setup work:

1) mydomain.com points to main server with a very low TTL (time to live)
2) failover server replicates data from main server
3) when main server goes down, mydomain.com is changed to point to failover server

The drawback is the DNS propagation time since some DNS servers don't honor the TTL and there is some caching happening on the user's machine and browser. I looked for empirical data to gauge the extent of the problem but couldn't find any so I decided to setup my own experiment.

The Experiment
==============

I start with mydomain.com pointing to the main server with a TTL of 1800 seconds (1/2 hour). I then change it to point to the failover server which simply port forwards to the main server. On the main server, I periodically compute the percentage of requests coming from the failover server which gives me the percentage of people for which the DNS change has propagated.

I made the DNS change at exactly 16:04 on 06/21/06 and here are the percentage of propagated users:

06/21/06 16:00 0 %
06/21/06 16:05 3 %
06/21/06 16:10 20 %
06/21/06 16:15 37 %
06/21/06 16:20 59 %
06/21/06 16:25 69 %
06/21/06 16:30 76 %
06/21/06 16:35 80 %
06/21/06 16:40 86 %
06/21/06 16:45 90 %
06/21/06 16:50 91 %
06/21/06 16:55 92 %
06/21/06 17:00 93 %
06/21/06 17:05 94 %
06/21/06 17:10 94 %
06/21/06 17:15 95 %
06/21/06 17:35 95 %
06/21/06 17:40 96 %
06/21/06 17:45 97 %
...
06/22/06 10:40 99 %

So even after 18 hours, there is still a certain percentage of users going to the old server so DNS failover is obviously not a 99.999% uptime solution. However, since more than 90% of the users are propagated in the first hour, the solution works well enough for me.

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10TB 1/4 Cabinet Deals - Looking To Expand Our Failover Product

Oct 11, 2009

Please do share if you know of a 10TB colo offer in either east or west. I know co-location is bandwidth-based but this is what we're looking for right now. Here are the requirements:

10TB (up and/or down) transfer on at least 100Mbps port

Good uptime history (BGP mix, A/B redundant power feeds, redundant hvac, etc)

Friendly crew (willing to help rack up 1U's if it's remote)

20A circuit (willing to consider 10A)

Access to KVMoIP

Ethernet drop

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Dell 1950 - Setting Network Card To Failover

Nov 5, 2008

We must install Dell 1950 With Centos 5 and WHM/Cpanel

How to setting 2 onboard NIC to fail over

The second card have same IP and must start only when the first is down.

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