Setting Up Redundant Mirror/Mirroring Server
Jul 7, 2009
I have a LAMP server running and would like to have the exact mirror running on another location. I would like to sync the web files and database in either real time (upon any update) or in delayed mode (x minutes after the update).
For MySQL, I believe replication can do the job unless anybody has better recommendation. What would you guys suggest for web files? Can I use different Linux flavor but maintain back the same LAMP version?
Is there any "online" 3rd party load balancing service that I could use to load balance the traffic to both servers?
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Jan 10, 2008
I have a DB server, running mysql 64bit. I would like to add another server to the mix to build some kind of redundancy if the 1st one were to go down.
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Apr 14, 2008
2 servers in 2 different continent. One will be primary and the other is redundant. It will be controlled by DNS fail over service.
Question:
1. What is the things that i need to consider before setting it up?
2. What is the best way to sync the data and databases?
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Aug 10, 2005
I currently have a mirror site set-up on a seperate server (with a seperate web hosting company) for risk management purposes.
For zero downtime dependability, a load balancer cluster checking both servers in real time, and directing traffic at only servers that were online has been suggested.
However this option is rather expensive. Does anyone know of any other options?
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Jan 29, 2009
A great insight to alot of my research and thank you in advance for any advice given.
I have a server based in HK(with WHMCS) and host several websites. The speed and availability serves the Asia Pacific market/viewers well; but we have several new websites that also targets the European and North American viewers.
I have been researching on getting a dedicated server based in US to mirror our server. Therefore allowing the US/European market to access the website faster. Although we have a few problems (and very little budget to solve it too ;p)
1. We need to sync the two servers in real time ; rsync seems to be the best but is there any other reccomendations?
2. We will make the IP address in each servers the same, so our clients need not change their dns. Do we need IPcast/anycast?
3. Is there anything else that I may have oversight?
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Oct 29, 2007
My company requires a Mirrored Server setup. I hope someone can direct me to the right solution which guarantees the least downtime.
- We have 20+ php/mysql websites.
- We need two dedicated servers hosted in 2 different datacentres.
- Users are directed to the first server.
- If the first server is down the users are automatically directed to the 2nd server @ the 2nd datacentre.
- The software/hardware which redirects the users need to be fail proof or have an instant backup which takes over incase that goes down too.
- Data (databases and files) needs to be synced correctly to avoid data not being mirrored correctly.
I've done some reading and there is alot of mention of the DNS round and load balancers.
However, it seems these two options are also not fail proof.
Would appreciate if someone could simply outlining what system would be best for us for 100% uptime incase of server failure.
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Jan 8, 2007
We damaged a file on a windows server 2003 system which caused us to get a grey screen where the login windows should be (it was setup as a domain controller)
We tried booting it in safe mode and all the other modes etc etc.... but to no avail... we couldn't get it to work.
So we wanted to replace the file manually using another pc (by inserting one of the harddrives into the pc, and copying the file to it).
We used a windows XP machine.... imported the harddrive using disk management..... we had to un mirror the drive to be able to access it.
Once the mirror was broken i gave it a drive letter, copied the the new file to it, and, removed the drive letter i assigned it, and tried booting with *just* that drive in the windows 2003 server.
Now it wont boot, it just reboots everytime i tries to start up, probably because we broke the mirror on a different machine.
It still boots from the other untouched drive... that was in the mirror, but we have no way to edit the files on there.
So is there any way to actually get this, once mirrored drive, to boot now its a single disc?
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Dec 18, 2005
i am new to this and am in need of some help.. i have vbulletin 3.5.0 installed with photopost gallery and phpprobid auction...
I am hosted with fasthosts on a linux dedicated server, it is crap! it has been down 3 times in 1 month, the support is terrrible.. I have already movedit from pipex hosting due to lack of support for mysql. i canot keep moving my site, my brain will melt out of my ears ...
Can i link to my original install.. so if the fasthost server goes down,, could i have it directed to the old server? and can i keep the 2 databases current?
Hope i have explained it well enough... basically need a backup server setup for my vbulletin so, i dont lose potential new members..
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Sep 12, 2007
I have two dedicated servers on two different countries. My idea is having one of them fully active and the other as a backup server so that in case the first crashes or something I only have to redirect the domains to the second server.
Can you help me on how this can be done?
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Dec 20, 2005
There are some Download Manager Programs that have a option like Find alternate URLs through mirror list file when giving a file for downloading. Where can I insert such a file in my site so that download programs can add other mirrors to it from my list of mirrors?
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Mar 28, 2009
Does anyone run a setup where 2 or more cPanel servers (perhaps in a shared hosting environment) are dynamically mirrored for high availability?
How have you configured this? Does cPanel play nicely?
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Feb 24, 2009
I was wondering if anyone knows of any provider that provides RAID VPS Mirrored Hosting.
So if one drive goes down, the site will immediately switch over to the next one in the cluster.
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Nov 16, 2006
We are expanding our photo sharing business and are revising our Unix-based server architecture. We're looking to develop a standard server configuration so that we can easily add servers when necessary.
Our ISP has recommended a configuration with mirrored web servers and mirrored RAID5 NAS boxes. I've read about Google's server architecture which consists of identical mirrored servers; when a drive or part from one of those servers goes down, data is served from the mirrored servers and the bad machine is repaired or replaced.
Comparing the two architectures with similar storage sizes, the overall cost of the hardware itself is about the same, with the identical mirrored machines being slightly cheaper. The monthly co-location fees (rack, power, etc.) are higher for the NAS solution.
I'm interested to hear your thoughts and experiences with similar solutions. I know the web/NAS solution is popular, and it's probably the one we'll go with, initially at least. Has anyone here implemented a Google-like identical mirrored server solution?
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Dec 17, 2008
Keeping mirrored backups...anything better than rsync?
I'm keeping mirrored backups of my servers. Does anyone know of any solution better than rsync to update the files on the backup server?
I've noticed that when running rsync it can cause a lot of disk i/o, which can slow down a running server.
Does anyone have any suggestions on how to decrease disk i/o or another solution to keeping mirrored backups on a secondary server?
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May 20, 2009
I was asked earlier today by one of the tech people at the university that I go to if I knew of any hosts that would offer some space/bw/access for a website that already exists. From what I was told, the host would not be the primary server for the website, so it would not require very much bandwidth, and the entirety of the website is only 300MB, so space isn't really an issue either (As most hosts now a days offer 1GB+). The catch is that they were planning on using rsync to update the mirror host, with the latest content from the live website, every 3 hours or so. Preferably, they want to spend as little money as possible on this and not buy a dedicated server or VPS somewhere, as that would be very costly.
So, does anyone here know of a host that would offer such a thing and allow SSH access to setup the rsync?
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Mar 19, 2008
I am trying to find a piece of software that will allow me to mirror the online files of my companies domain. There are a number of contributers to the domain, so files are not stored offline in one location. I want to create an exact mirror of the contents that perhaps I schedule to mirror once every week.
I cant seem to find anything that would allow me to do this.... can anyone point me in the right direction?
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Apr 2, 2009
On a CentOS5 VPS I have access to "yum update" barely working due to the base mirror "styx.biochem.wfubmc.edu" being tremendously slow.
I'm trying to find out how to disable that mirror possibly via a mirror exclude setting in yum.conf or some other way. I've been searching but I've not found any documentation on this so hopefully somebody out there will know how to make this change.
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Jan 29, 2009
I'm having an issue with a client site and I am not sure what to do at this point. Conversations with the host (GoDaddy) haven't led to a solution and to be honest, I'm not sure it's their issue to handle although I will be firing off an email to their domain dispute department shortly. I spoke with a couple of supervisors there and they were as baffled as I am.
Here's the situation:
When people Google the name of the client's business, it returns their site but on a different domain. The entire site is there, nothing is changed but the URL. It's like having an unintentional mirror site except that none of the forms work which is what tipped off the users that something was wrong but of course, they don't notice that they're not actually on 'www.clientsite.com' so they think it's just a form error when in actuality, they're not even at the right domain.
There is really no way for this other domain to profit from mirroring the client's site; it's just a business profile type of thing with a few forms for contact, employment applications and vendor applications. No secure info is transmitted other than perhaps the occasional email address but we're not talking a heavy volume site, it's a niche market and really not something that would be a typical target. There's no eCommerce, no subscriptions, no financial info.
I'm at a total loss. Could this happen if this other site is hosted on the same server as my client's site? Could it be an actual error of some sort or would it have to be intentional?
The whois for this bogus site leads to DomainsbyProxy.com and I'll be sending them a letter as well but I'd really appreciate any input you all might have on HOW this could happen. Should I also contact Google?
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Mar 10, 2005
If you receive the following errors while trying to install a Perl Module through the WHM ...
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Nov 5, 2009
We recently began to mirror a large number of open source projects with a dedicated mirror server on our network and I was surprised not only with how popular the mirror server has become, is, but also of the ability of the hardware we're using to keep up with the load.
At an given time, the mirror seems to be pushing at least 50 Megabits of trafficthe server is also an IRC server (irc.igsobe.com) for customers and internal staff communications.
The hardware is a low end Dell Pentium 4 @ 2.66 GHZ server, running with 512MB of RAM and a 400 GB ATA hard drive. CentOS v5.3 is the operating system.
If you're interested, you can view the HTML logfile analysis here but that doesn't tell the full story as FTP users make up a good portion of the traffic. We've received over a quarter million hits in the first few days of November alone.
18:14:15 up 65 days, 9:04, 5 users, load average: 0.31, 0.69, 0.56
The only change that I made to the default configuration was lowering the maximum number of Apache servers to 128.
Just thought I'd share this information as I wouldn't have thought a server with such a small amount of RAM would be able to serve up so much data, even though we are talking strictly static HTML files.
I'll definitely keep this in mind when clients ask me for those "what type of dedicated server should I use for XXX" type discussions that are had all too often with clients.
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Sep 15, 2007
I have two servers. One hosts about 55 small sites and the other does nothing.
Can I make use of the spare one to take over automatically if the main server fails for whatever reason?
I had been thinking of using Rsync to backup accounts / mail every 6 hours or so and then manually changing the nameservers on the domains in the event of server1 failing. Would that even work? Then I got thinking about it all being automatic.
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Apr 15, 2008
We have 2 linux servers with plesk. We want Redundant Dns and backup mail servers for our hosting domains. We already setup Primary nameserver ip address is first server, Sec Nameserver ip address is second Server. like
ns.ourdomain.com - first server ip address
ns1.ourdomain.com - Second server IP Address
and how can setup backup mail server for both servers
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Oct 29, 2008
I have registered a domain using godaddy. I have hosted my site on a server of my shared hosting provider(lets call them X).Currently I have pointed mydomain.com to the server and it is up and running.Sometimes, I have experienced downtimes.
In order to solve this problem, I have hosted a clone of my site on another server from another hosting company(lets call them Y).
1. I want mydomain.com to point to Y when X is down
2. again point it to X when it is up.
My main aim is to have my site live with less downtime. The probability having both servers down is very less.
I dont know if it is technically feasible, just a thought out of dirty mind. I tried to google but was not able to find an answer specific to my problem.
Can anybody tell me how to achieve this through godaddy domain.
Added note, My site is not a commercial site and I cant afford large dedicated servers with clustering and failovers.
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Dec 19, 2008
Mirror a site running server 2003 web services
I'm a network admin at a university and one of the departments is hosting their site on their own personal server running Server 2003 and Windows Web services. They've been asking me how would they go about mirroring their site in the event of a power loss intentional or otherwise. There are times during holiday periods where building maintenance will shut off power but they still want students to be able to get to their site. So they want to set up a mirror on another server in an office offsite.
I've done some research on the subject but I haven't been able to find anything dealing with mirroring Microsoft hosted sites.
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Mar 22, 2007
We are considering buying rackspace at a datacenter, and setting up two servers. The first would be the primary, lets call it Stewie. The second is called Peter.
Is it possible to setup some sort of either software or hardware solution that automatically mirrors all data from Stewie to Peter automatically?
Basically we want a redundant setup, where if either one of the server fails, the other can take over without any interruption and loss of data.
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Apr 9, 2008
I was wondering how I can mirror another server, I have a client website and they want redundant DNS so if one of their servers goes offline, the other will keep it up. Any ideas how I can set this up? Is it difficult to do?
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Jan 30, 2007
First of all appologies if this is posted in the wrong forum, was unsure of where to ask the following questions.
We have a web server running a web application accessed by a large number of users during a working day. On an evening the web server is set to back up the database to another web server at a different location.
The server is running SQL 2000 ( although we are just upgrading to SQL 2005)
My question is how easy would it be to setup our server so it "mirrors" to our back up server. What I mean by this is that at periods during a working day the database is transfered to our back up server at periodic intervals, say every 15 mins, so that in event we suffer a problem with our main server could re direct our users to our back up server, with little or no data loss?
If this is possible does it also put extra strain on our server that is being accessed, i.e. would users notice a slow down of server as data is moved about?
If all the above is possible, is there any easy way of pointing our domain name at the back up server within say 15mins or so of main server failure? if our main server went down we could not redirect users form main server to back up, so is there any method of making this happen in event of failure of main server?
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Sep 4, 2006
I'm a web designer - not an IT guy, as such I'm not 100% on setting up servers/dev environments etc...
I'm freelance and currently working in-house for a client that has set up a dev server that supposedly mirrors their live site - its a catalogue site with loads of dynamic elements.
The dev site they've set up displays only the html, no images or stylesheets link up when i preview them in dreamweaver as they don't logically link to the page as the pages are templates drawn from various folders.
What I want to know is is it possible to mirror a dev server exactly like the live website so the scripts etc all work as they do on the live site. I'm pretty sure it is as I've worked on dev servers before but not one like this bloody mess. The IT bods here seem to think the dev server is the best that is achievable - are they right? am I missing something???
I can't really answer any technical questions apart from i think the dev server is an apache server - what do i need to explain to the IT bods to get my point across?
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May 21, 2008
Well I am looking to learn to manage a server (so I won't need to hire others to do what I can do). However I have some basic questions.
1) So lets say you have a server with two identical HDD's and raid 1?? or a SATA controller so that the second HDD is just a mirror of the first HDD when/if the first HDD dies does the SATA controller or RAID card see that the first HDD died and switch to the second HDD so the site that is hosted on the server stays online?? I am thinking yes as that would seem to be the point of having a raid or sata controller and setup ??
Part twoto the question is is their software that you need to install that will make the server email you when/if a HDD dies (so you can do pull the dead one out and replace it with a new one). Or is it just that you would watch some type of server log(s) to stay ontop of if the server is running all good??
Second is how common (these days) is it for a server that would be new and brand name have a HDD die or have some other hardware failure?
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Oct 17, 2006
This is my first post and had a question about dns and mirroring.
Here is the scenerio :
I have my main website on server1 and it is a whm cpanel server. The website is dynamic and database oriented website.
I have another server - server2 with whm installed on it and I wish to configure both the servers such a way that the data is synchronised on both the servers in particular intervals.
Also I would like to configure dns redundancy in such a way that if one server goes offline for some reason, the website should be immediately resolving from the other server.
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