How To Cluster?
Mar 19, 2008
We have been running two dedicated servers for a number of years now and we use Cpanel and DirectAdmin for the control panels. Today we had a big problem with our first server which effectively made the 150 sites on it out of action and it exposed a potential issue to us that if the server died that we'd have a big task restoring all the sites from the backup drive. I've heard that some hosting companies strip data across more than one machine and I presume this is a cluster, and I was wondering if this is the best method and what the most cost effective route would be to do it?
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Mar 19, 2008
Anyone had any experience with setting up an ftp cluster? We have tried to search Google and haven't been successful in such a solution so I came here to ask if anyone else has ever thought about doing it. Or done it and how did you do it? I'm looking in to it for windows. 99% of my servers are windows.
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Aug 8, 2007
I see more and more hosts popping up (and older hosts switching to) offering what they call clustered load balanced plans. These plans are mostly on the low end price wise (sub $10/month), and the marketing speak tells of zero downtime, intelligent clustered, load balanced, failover, will wash your clothes approaches to keeping websites up 110% of the time.
I guess what I fail to grasp is are these plans really, truly load balanced clustered approaches, or is it more of a case of we have 1 DNS server, 1 mail server, 1 web server, 1 mysql server, and a backup server that in an emergency has rsyncs each hour to "failover" to and screw up your dynamic data?
If the webservers are load balanced, what about accounts that use SQLite db's, or berkeley db's, are these maintained 100% in synch, and if so, how? If one server goes down, and the other picks up the slack, won't the db's be out of synch and data contention will occur? Are sessions including SSL truly handled correctly?
Same for MySQL. Is this true two way replication with fault tolerant switchovers between master and slave to preclude data loss and corruption on hot switch overs when a server fails?
I guess I just see everyone slapping a "clustered" label on things, and speaking of load balancers, etc... all for the cup of coffee a month. But I am highly suspect if these plans are truly load balanced, or is it a band-aid approach to load balancing?
Just the ranting of a an older hosting owner who's just not sure what many companies are truly offering when they speak of clustered, load balanced, more uptime than Viagra type of solutions...
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Jun 26, 2007
I was wondering if there is any way to connect 40-50 Linux VPSes in a cluster. Most of the cluster solutions out there want you to recompile a custom kernel which cannot be done on a vps. The virtual machines are on different hardware nodes and I don't have access to those since I am renting the VPSes from another company.
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May 2, 2009
What is the best way to make sure my website is 100% available all the time.
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Jun 8, 2009
On setting up a pair of CPanel DNS only servers, I decided to use 2 Virtual Servers from 2 seperate companies - one Xen and the other was Openvz. Reason behind it was in case something happens to the company or the virtualization technology implemented, I'm not screwed.
Guess what! Next day my Openvz node (I will not name the provider) went south and I'm on one leg right now. I'm kinda pleased with myself for having this laid out from the beginning and DNS is still working fine.
Now I'm thinking of having different OS - one linux and the other freebsd. Am I paranoid and over-the-top?
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Apr 2, 2008
we are planing to build a 5 system mysql cluster for our website. i have few questions regarding this. As per our provider, we need mod_ndb for apache to connect database cluster. (SQL API). we have 5 system apache cluster.
Mod_ndb configuration, we need to add all table structure in http configuration. Is there any other way to connect database? or any other way to configure mod_ndb without adding table structure inside http configuration.
any other better way to connect database
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Jun 1, 2008
All my sites that depend on MySQL at iMountain have been down all day. I was in the process of converting some of them to Joomla/Drupal but I'm having second thoughts now.
My question is - shouldn't "clustering" prevent this sort of thing happening? I thought it implied some level of redundancy.
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May 13, 2008
I try to keep on the up and up about hosting and constantly looking for a new host to provide better services, but I saw an article in TheWHIR that got me to wonder if people are making stuff up or is it just "marketing" or real?
Ok, so the article:
[url]
I hope adding a link to the article is ok?
First of all I have NEVER heard of cPanel ever offering clustered technology. Can anyone confirm or deny that this is real? I have really only used HSphere which I know has some cluster abilities and even those hosts don't advertise "clustered" services.
Then I see other so called cPanel wannabe clustered services which they call cPanel clustered failover or something like that which to me is ummm..more fault tolerant hosting than actual cluster hosting.
Basically, am I just not understanding the meaning of "cluster"?
I think cluster has to do with the proper allocation of reasources spread across the network of defined processes, though, I have been wrong in the past...
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Dec 22, 2008
i have a site which involves heavy cpu use but its in a small private network with 3 other boxes which are pretty much idle, so im wondering is their a way to use the idle cpu time /ram possibly on my main server via the network ?
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Mar 21, 2008
I have a total DB in size of 800MB... Recently I had to make a few configurations in the management tool and had to do an intialize restart... Not sure what's taking so long, but it's been nearly 8 hours and I have not seen any of my tables that used to be there.
When I do du -sh /var/lib/mysql-cluster, it shows that I have 800M /var/lib/mysql-cluster...
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Sep 2, 2007
I just need a bit of feedback, I currently have a forum, getting around 20-35k uniques per day.
I am currently on a Intel C2D, 4gb Ram, paying around $185/month.
Would setting up a cluster help me reduce the costs or load?
Cluster = 1 server for httpd, 1 server for mysql, 1 server for images?
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Jul 27, 2006
I´m running 4 servers on a cpanel - dns - cluster.
- 1 running cpanel (srv01)
- 3 running cpanel-dns-only (cluster01 - cluster03)
My DNS config is:
srv01 - dns1.domain.com
cluster01 - dns2.domain.com
I ´ve setup on srv01:
- cluster01 (synchronize changes)
- cluster02 (standalone)
- cluster03 (standalone)
On cluster01:
- srv01 (synchronize changes)
- cluster02 (standalone)
- cluster03 (standalone)
And on cluster02 and cluster03, I did something like that:
- srv01 (synchronize changes)
- cluster01 (synchronize changes)
- cluster03 (standalone)
And
- srv01 (synchronize changes)
- cluster01 (synchronize changes)
- cluster02 (standalone)
1. So, is that correct?
2. It seems that when I click on 'syncronize all DNS records on all the servers' only cluster01 and srv01 got all the DNS records. So is it normal?
Yet If I add a domain on cluster02 for example, where I need to add the DNS? cluster02 named.conf or on cluster01/srv01?
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Oct 18, 2006
Anyone have issues where after setting up cpanel dns cluster via whm, cpanel fails often on the clustered boxes?
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Feb 1, 2009
when cluster server will be avalaible?
and I'm curious about the space and bandwidth of this service
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Jul 2, 2008
I'm planning to upgrade my servers to a more "enterprise-class" installation and would like to hear your advice for good managed hosting providers for this.
Currently I use RackSpace which are great but pricey (leased servers); in the past we had a colocation with another provider: it was good cost-wise and generally proffesional but alas the provider's infrastructure was not sufficiently resilient to natural disasters and unlikely but occurring infrastructure accidents.
My feeling is to stay with a more managed service rather than try to colocate again: we need someone making sure the hardware stays around 24/7 and makes sure to have the appropriate spare parts and expertise in the hardware they sell us. We can handle the software parts.
I'll probably stay with RackSpace because they can and have already built stuff like the below. But maybe there's another provider out there which fullfills similar needs for customers.
My needs are:
1.5 TB of shared storage (i.e. SAN or NAS; must be reasonably fast (maybe 10MB/s sustained) and 99.99% up); add .5TB per year
4 application servers in various configuration (8-16G of RAM, quad or dual-quad Xeons)
2 database servers (With fast drives in RAID-10 but not much disk; most of our data is not in an SQL server)
Some appropriate load balancing appliance (with at least 99.99% reliability)
Red Hat Enterprise Linux 5
Redundancy to a point (i.e. redundant mechnical parts, hot-swap drives)
Usual stuff: managed backup, private network, hardware monitoring with fast hardware exchange
No Linux system administration beyond a sane installation needed
99.99% uptime on the network and infrastructure (i.e. if an UPS blows up or a router goes down this should not affect me; redundant connections to multiple network providers etc. etc). RackSpace has a 100% network uptime guarantee and in the many years we've been with them in one form of another I haven't been disappointed in their competency on that front.
This would be in some US datacenter. Does someone have experience with such a scale installations with other providers (or RackSpace too) ?
(I wrote "SAN or NAS" because I'm not really yet sure if some NFS server or maybe shared storage via SAN and something like RedHat's GFS will be best for my needs; it would be nice if the provider was capable of advicing on things like that).
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Feb 23, 2008
I have started to move my websites over to my UK Colocation But would like a little guidence on what the best solution would be.
I would like to build up a Server Cluster that will handle all of my sites really and also have redundancy, so If 1 server goes down the other Web/SQL/Whatever server will be used instead.
I have websites ranging from large forums to streaming & download websites.
Should I got for a setup for example:
X Web Servers + X Database Servers
Connected to X Storage (see link below)
Connecting the Web Servers in something like a a round robin config or use a Load Balancer / Other
OR Should I setup multiple:
Web Server + Database Server + Media Server
OR another config?
Below are my current setups
Current UK Setup (Colocation)
Web Server
Quad Core, 8GB Ram, 250gb HDD Raid 1
Quad Core, 8GB Ram, 250gb HDD Raid 1 (just ordered)
SQL Server
Quad Core, 4GB Ram, 250gb HDD Raid 10
Storage Server
HP StorageWorks NAS 1200s 1TB (just Ordered)
Link: [url]
Current US Setup (Dedicated Servers)
Web Server
Quad Core x2, 8GB Ram, 3TB HDD
SQL Server
Quad Core x2, 8GB Ram, 1TB HDD
Media Server
Quad Core x2, 8GB Ram, 3TB HDD
Dual Core, 4GB Ram, 3TB HDD
Backup Server
Dual Core, 2GB Ram, 1TB HDD
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Jun 9, 2008
We've come to a crossroad with our site and not sure where to take it from here. It would seem like a cluster option would be the best bet, but wanted to ask the professionals first to see if there were any other way to solve it.
The problem is (as usual) too high load making the servers slow. Actually, only the apache server. We recently seperated mySQL and apache on two servers to help out with the load. The mySQL server load is around 0.25-0.5 throughout the day, but the apache server load is almost always at 6.xx-10.xx.
Both servers has the following stats:
CPU: Intel Core2Quad Q6600-S3 (Quad Core @ 2.4GHz)
RAM: 8GB DDR2
HDD: 750gb SATA2
Average Daily Stats:
Uniques: 60 000
Pages: 1 300 000
Hits: 14 700 000
BW: 95 GB
Concurrent users on vBulletin forums 250-700.
* Shouldn't an apache server with these stats be capable to handle the current visits?
* Could this perhaps be solved if we swapped the sata drive with a scsi/sas?
If we're moving to a cluster solution, we'd be looking at minimum 5 servers.
2x Load balancing servers
1x SQL server
2x Apache servers
Preferably we should have 2 SQL servers for redudancy, but for a site that is hobby based, it would be insane to pay around $1245-1490 a month just to keep it up.
Key stats from httpd.conf
Code:
ServerType standalone
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 1
MinSpareServers 15
MaxSpareServers 20
StartServers 15
MaxClients 275
MaxRequestsPerChild 1000
I have root access if anyone needs more info.
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Nov 16, 2008
I there any good shared or reseller host that has clustered mysql servers facility?
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Aug 27, 2007
i am going to use with hsphere preferently i want to use Dell blade server 1955 with exchange and sharepoint, cause the low HD capacity i will like to add and HD array could be NAS or SAN,
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Jun 17, 2008
This is clearly the next logical step in hosting. Consider what RAID1 did for hard drive availability. Worried about your disk failing? No problem - throw in a duplicate. From a user/admin perspective the mirrored disks appear as one, highly reliable disk. Every modern OS supports this, even cheap motherboards support it, with a minimal amount of configuration.
The perfect high availability cluster should be completely transparent. Think about it... What if clustered hardware allowed you to manage a single instance of your chosen server OS with no worries about hardware/network/power failure?
The closest you can get to this finding a host that will give you a dual power supply server connected to different power feeds, dual network cards connected to different switches, and hot-swappable mirrored hard drives. This solution still doesn't give you any protection from CPU, memory, or motherboard failure.
I want a solution that is as simple to configure and manage as simple RAID1 mirroring.
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May 27, 2007
put together a high availability cluster for a PHP + MySQL based app to run on a LAN. We're going to use Linux, and cost is a major consern. The app itself doesn't use / need too much resources, as it will only be accessed by 2 / 3 people at a time, so I'm using the following:
2 identical PC's with:
3Ghz PIV CPU
1GB RAM
2x SATAII 160GB HDD space setup as RAID 1
10/100 Mbps LAN NIC's, on a 100MB 8 port switch
Up to now I have been running MySQL-Max 5.0.15 to run a MySQL master-master replication server, which works fine, but the setup involved a lot of manual work, and downloading of the right binaries.
Furthermore I used Linux Heartbeat todo auto switchover between the two servers & RSYNC to sync the application files between the two. This has been working fine untill one of the server's HDD's failed recently corrupting both HDD's
So, I need a better way of doing this, and want to meet the following requirements:
If 1 HDD fails on either server, the server still needs to be able to run without a problem.
Replacing a HDD & rebuilding the RAID array should be easy to manage, preferabbly over the net.
Setting up a cluster should be easy to manage, both for the MySQL DB server & the files that need to be synced between the two machines Re-installing the server should be easy todo as well.
For No.1 I have been thinking of setting up RAID 5 with 4x HDD's - how reliable / safe / redundant is this?
For No. 4 I have been thinking of using something like sysimager to backup the server once setup, but will / can it recreate the RAID array upon restoration? The MySQL DB & PHP files are being backed up to a removable HDD on a daily basis.
The client is 700Km's away, so we can't just drop-in to fix things as often as we like. Thus redundancy is of utter importance. Currently I'm running Suse 9.3, simply due to the fact that it's easy enough to tell the client over the phone howto do things with YaST. Suse 10.1 will be used for the new setup, but I could also use Fedora Core 5, and have also been thinking of using SME server 7.0.
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Sep 1, 2007
Was thinking about running an email server for some local businesses, so they can out source their IT systems (cheaper).
Now setting up a mail server, say running DirectAdmin is normally fine.
However this is a "mission critical" service to these guys, so I want 9.9999% uptime !
I was thinking of getting a few VPS's around 384MB RAM, 20GB HDD spec in the same DC but on different nodes and setting up a cluster...
And then I thought..... How the hell do I do that..? WHT must know.....
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Mar 23, 2007
Can anyone recommend a dedicated server provider that will allow us to setup a virtual iron cluster.
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Aug 10, 2007
I already have a VPS with Knownhost but since i'm hosting a critical application i really need High Availability.
Could anyone recommend a company that can provide me this?
I rent a VPS with them + pay additional tax and they conf a VPS Cluster.
The application is PHP + Mysql based. Everything is stored on MySQL and the PHP is only changed when there is a upgrade. Also, PHP is compiled with Ioncube ( doesn't know if this matters ).
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Jul 9, 2007
I have 4 dedicated servers in 1and1 and i want to create a server cluster for windows media services to stabilize the server load. i tried to add the second server details in the first server's windows media services and it always says, access denied message.
how can i give permissions to create a server cluster for windows media services? i didn't installed any additional firewalls in the servers and i am using this for only Windows media services so IIS is disabled. my configuration and server details are below...
Windows 2003 Standard edition 64 bit
Athlon
64x2 3800+
2 x 2,0GHz
1 GB Ram
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May 29, 2007
I'd like to create cluster of 2-3 web hosting servers. Data shared on NAS, infront load balancer. But I have problem what to do with Mysql server. First I wanted create cluster. But it requires my customers create cluster databases, not Myisam or Innodb.
Second solution is replication But I can see problem with creating multiple master servers. There is suggestion to create master for writing , and slaves for reading, but I can not imagine how do it transparent for users. I'd like to know how other people solve this problem.
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Feb 12, 2008
My company is trying to setup a large network to serve around 2.5 million monthly visitors. We are in need of a network consultant to help us out. Does anyone have any recommendations?
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Jan 12, 2006
I'm working on a huge project that will take like 2 months or so to release. The thing is, as I expect, this site is going to grow massively. My question is, How can I handle lot of traffic and give lot of space to my users? With a load balancing right? or server cluster? my question is? how does this work? where do I get it? what are the prices like?
All info on it is appreciated, i want to start with one from day one, so I can handle the grownth of the site once it happens.
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May 30, 2008
I was curious to know if it were possible to share your domain on a cluster server even if it has a dedicated IP and an SSL license assigned to it?
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