CPanel DNS Clustering And Redundancy

May 5, 2008

I am working on setting up a few servers that run cPanel and the usual software, minus any sort of DNS server. These servers are setup to sync all DNS records over to a cPanel "Dns Only" (ns1.domain.com), which in turn syncs all its records to a backup DNS server (ns2.domain.com).

In other words:
[Domain registrar]
| |
[NS1]--Sync-->[NS2]
|
(Sync to NS1)
|
Cpanel Web Server

Now, say something happens to NS1 and the sever goes completely offline (i.e. power supply dies, CPU goes bad, etc.), which of the following scenarios would actually happen:

1) Because the registrar lists both NS1 and NS2 as NS records, NS1 would time out and the DNS lookup would look to the secondary DNS (NS2) for the record.

2) The registrar would randomly give out NS1 OR NS2 because of round robin, and if NS1 is given to a client as the result of a DNS lookup, the site will appear down, however if the client happens to be referred to NS2, the site would appear online.

3) The site would be down no matter what.

So, if someone with knowledge on the subject wouldn't mind enlightening me as to which of those would actually take place in the event of a failure on NS1, and maybe some suggestions as to keeping the DNS truely "redundant", then I would greatly appreciate it.

And Im aware that there are many 3rd party services that will take care of the DNS records and make them redundant (DYNDNS, DNSMadeEasy, etc) But I would prefer to keep the DNS in our full control.

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CPanel DNS Clustering

Apr 28, 2008

I just set up a cPanel DNS Cluster today. Followed the guide, and everything didnt according to my plan. As in, setup went fine, setting it up went fine too. But I do not think I understood how this solution works in real... or atleast I had assumed it to work in a different way.

So for my questions...

1) How and where do I edit the DNS Zones. On the local system or the DNS dedicated server?

2) How do I create nameservers for this dedicated DNS server? Not the registrar part, but the A record and NS record part.

3) Small doubt, not a big one. Does the DNS server have to be in stand alone mode or synchronized mode?

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Cpanel DNS Clustering

Jul 18, 2007

I'm currently using Cpanel on all our web hosting machines (total of 6 machines). Each runs its own DNS but also uses the Cpanel cluster feature to sync between all machines.

This has got to the point where DNS updates will not stay, the machines get very lagged etc etc. Now I have put 2 more machines online to do nothing but DNS.

What is the best way to set this up?

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May 24, 2009

I'm not into Dns Clustering that much all I know is some articles and threads about how to do it, and the benefits

Anyway I decided to give it a try 1st with minimum fees

so I want to host my Main domain website on a VPS, as it don't need much resources and using it as a Primary Dns Server

and use my current server as a Slave DNS server that is contain most of my client sites

It's logically possible as I see but..

Is there any Disadvantage? if exist what is it?

Do I have to make both on the same DC?

Will it affect my Slave DNS Server Performance, Stability and Load?

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May 25, 2009

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Aug 25, 2007

I am trying to setup a server cluster for my client and was thinking about load balancer.
Currently he has 4 Servers and 1 VPS.

4 Servers are in the same datacenter while VPS isn't.

Now from my thoughts about the system load, I have decided to setup like this:
VPS being the load balancer
2 Servers being the Apache
1 Server being Storage server
1 Server being MySQL

This will be hosting two forums that has very high concurrent access.

Now the problem is VPS has only 200GB/mo bandwidth while he needs about 800GB total.
My question is is there anyway to load balance the servers without the traffic going

like this:
LoadBalancer-->Apache Servers-->LoadBalancer-->USER
If the traffic goes like that then VPS needs to have about 1600GB bandwidth and will have network bottlenecks.

I would like the traffic to go like the following:
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Sep 9, 2007

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Jun 20, 2008

Im going to start to plan to build a new hosting setup within my business and aim to slowly move away from the shared hosting scene and move into clustered (web hosting)

Now im not great with words so i am sorry if any of this doesnt make sence.

Im looking to build a setup using 5+ Dedicated servers, using a cluster config and using something like plesk on top to offer high availability hosting. As i understand it using a clustered setup will provide a much higher chance of keeping 99.9/100% uptime as it eliminates a single point of failure.

But what im un sure on and what ive not learnt about yet is what is needed to make this work, what kind of software is involved and how would the Hard-drive arrangement work. For example

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Feb 28, 2008

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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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Nov 6, 2007

I am going to build a clustering system for a customer. It's around 15 servers running apache, mysql and mail. Wondering which switch do you recommend for that? I am using a HP Procurve 2524 for another smaller system, but customers face to slow performance *sometimes*

For the feature, dont need much. Dont need routing feature (Layer3 switch?), just to connect all of them into a clustering system.

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Oct 7, 2006

what happens when I have 2 DNS servers on my domain and 1 fails?
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Sep 25, 2009

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Aug 19, 2008

im now having a second server located somewhere else then my first one.

I'd like to setup something to have redundance. if server1 goes down or even if it's too much loaded server2 take the charge.

How can i do this?

let say im having a domain "mydomain.com"

Server1 ip: 10.0.0.1 (Services; Apache, DNS)
server2 ip: 192.168.0.1 (Services; Apache, DNS)

mydomain.com nameserver would be.
ns1.mydomain.com -> 10.0.0.1
ns2.mydomain.com -> 192.168.0.1

Now will i have to create 2 NS record on both server plus A record.
I cant understand this part ?

Now how would i setup bind so they replicate zone btw each other?

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May 1, 2008

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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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Apr 11, 2008

What are the smaller shops doing for switch redundancy? We have all our machines on dual Com Ed feeds but most switches in the $1k-$3k range only have one power supply. We recently had a power strip go flakey and of course the switch was plugged into it.

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Sep 19, 2008

I have multiple hosting plans with different hosts and in different areas. I also have some STATIC websites.

I would like to know if there is a way for me to make my website available on multiple servers in case one of them is down.

I thought of changing the nameservers of my domain to

IP1 Hosted on host 1
IP2 Hosted on host 2
IP3 Hosted on host 3

of course the files will be uploaded to all three servers.

Is it possible and how should it be done?

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Jun 2, 2008

I host several web clients that were recently impacted by the crap at ThePlanet. As I think about how to be more redundant (and repetitive) I'm not sure of my options.

What's the best practice to ensure that if you have a server at a data center that goes out, that you can (somewhat) easily switch over to a different server? I suppose one solution is to have 2 servers at 2 physical locations, and then you could just change the DNS record in the event of failure, but is there another solution I'm not aware of? Is there a good resource I can goto to read up on this info?

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Mar 29, 2009

I have a 2 cPanel DNSonly cluster setup for all our hosting operations.

However, we are adding a Windows Domain Forest (for Outlook "push-mail") for this the windows server needs to be its own DNS server. We are also planning to host sites on the windows server (no control panel).

Is there any way that I can allow cPanel to use Windows DNS as the new "cluster" and update/delete/add records of DNS to the windows machines?

Same would apply to this question, we are thinking about adding a Directadmin test box, but we want to keep our NS1 and NS2 cluster so they all work with it. Is it possible? What is the feature called if you can't elaborate on it so I can research it?

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Sep 21, 2007

So would the load times be noticeably longer if I ran load balancers, and then had my web servers nfs mounted to file servers / san and connecting over the network to database servers? It seems like a lot of network overhead to deal with.

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Sep 29, 2009

I am planning to buy a dedicated server and a shared server from a hosting company.
Basically I want to have a redundant server so that if one file server goes down, there is no downtime.

Somehow the servers would need to be constantly synchronized so that the files saved to one are immediately saved to the other server as well.

Can somebody told me how to setup the 2 server so that my dedicated server can serve as the main server and if the dedicated server is down, the shared server can automatically be activated and visitors of my website will auto be redirect to the shared server.

Do i need to setup any backup DNS too so that when the dedicated server is down, it will auto redirect the user to the shared server.

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Recommendations For High-performance Hosting (clustering)

Jun 14, 2008

I'd like to get your recommendations on how I should approach this problem. I posted this in another part of the forum, but I feel that this is a more appropriate place for it.

Problem:

How to handle large amounts of traffic with for a social network website? If a user uploads a photo or video, how does it become accessible on all of the server? If traffic is expected to be about 500,000 visitors a day, how many machines do you think I should use?

Possible Solution:

I've come up with the following possible infrastructure.

One load balancer. The load balancer has 3 PHP/Apache servers behind it. Behind each of the PHP/Apache servers is a (slave) MySQL server, from which data is read. Behind the slave MySQL servers, there is 1 master MySQL server, which handles all of the database writes. The master MySQL and slave MySQL servers are synced up, so data is up to date.

The actual photo and video files are not stored in the database, only the links to them is stored in the database (to keep the database small). The photo and video reside in a central location (like a SAN or NAS), which is accessible by all of the 3 PHP/Apache webservers.

Questions:

1. How many machines do you think will be able to handle photo and video uploads for 500,000 visitors a day?

2. Is having a SAN with Terabytes of RAIDED disk space an available option?

3. If a SAN or NAS is not an option, does anyone have any ideas on how to make sure all of the web servers have access to the same photos and videos? Is rsync a viable solution?

4. Which hosting provider do you think I should go with?

5. Is clustering what I need? What is clustering and how will it address my concerns?

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Recommendations For High Performance Hosting (clustering)

Jun 14, 2008

I'd like to get your recommendations on how I should approach this problem.

Problem:

How to handle large amounts of traffic with for a social network website? If a user uploads a photo or video, how does it become accessible on all of the server? If traffic is expected to be about 500,000 visitors a day, how many machines do you think I should use?

Possible Solution:

I've come up with the following possible infrastructure.

One load balancer. The load balancer has 3 PHP/Apache servers behind it. Behind each of the PHP/Apache servers is a (slave) MySQL server, from which data is read. Behind the slave MySQL servers, there is 1 master MySQL server, which handles all of the database writes. The master MySQL and slave MySQL servers are synced up, so data is up to date.

The actual photo and video files are not stored in the database, only the links to them is stored in the database (to keep the database small). The photo and video reside in a central location (like a SAN or NAS), which is accessible by all of the 3 PHP/Apache webservers.

Questions:

1. How many machines do you think will be able to handle photo and video uploads for 500,000 visitors a day?

2. Is having a SAN with Terabytes of RAIDED disk space an available option?

3. If a SAN or NAS is not an option, does anyone have any ideas on how to make sure all of the web servers have access to the same photos and videos? Is rsync a viable solution?

4. Which hosting provider do you think I should go with?

5. Is clustering what I need? What is clustering and how will it address my concerns?

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Oct 5, 2009

Let’s say I have the website myname.com

Myname.com is a very popular website and his content mirrors in 2servers (Server A and Server B) in 2 different datacenters (exactly same content).

When Server A fails due to datacenter or rack problem and no site is responding, then I need some service to transfer ALL traffic to server B. Is there any (paid or free) service doing such a thing? If yes, what about dns propagation? As far as I am concerned, dns propagation is a very slow procedure depending on each internet provider.

So how could we instantly make Server B to come live to ALL visitors? Is there any quick and reliable dns redundancy system without having to wait for dns propagation?

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Aug 14, 2008

Redundancy or more hard drive space, what is your vote?

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Nov 11, 2008

I have two questions that hopefully someone will be able to help me out with. The first, is my partner and I want to provide server redundancy for our clients. Our set-up is as follows: two identical servers with multiple virtual machines (about 4) on each. One for SQL, one for IIS, etc. We also have a ServerIron XL to connect the two together and provide replication and load balancing. So the question is, has anyone here used a ServerIron XL and how easy is it to use/how effective is it? The second question is, we would like to provide our clients with hosted Exchange. I have set up and maintained a few Exchange 2007 servers, but only for a single company with a single domain. What would be the best way to go about providing a hosted Exchange solution?

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