Redhat Cluster Suite Case Studies / Tutorial

Sep 18, 2007

I would like to know f.e the setup scenarios f.e for one,two or x fence devices.
The below docs just dont contain enough meat to get you going.

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If you are aware of any good hands on tutorials or docs than please feel free to let me know.

I dont mind if the documentation has no screenshoots but the technical explanations must be sound in order to understand how to configure RHCS.

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Virtual Private Server (VPS) Case Studies

Feb 22, 2008

I am writing a few articles about Virtual Private servers and their advantages over regular shared hosting or dedicated servers.

As such Im looking for some case studies from users of vps who found that a vps hosting option was particualrly right for them and why.

Often a couple of sentances to illustrate your point will be enough for me to work with. Naturally there will be a link to the site that your vps was useful if you wish.

Please feel free to reply here or pm me your experiences.

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Cisco Cluster Management Suite (CMS) Software

Jul 25, 2008

Is it easy enough to setup without using the SSH/Telnet console at all? I am thinking about purchasing a Cisco 3550 EMI

Is it free download/use?

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HAproxy - Quick And Dirty HTTP Load Balancing Tutorial On Redhat/Centos

Aug 14, 2007

This can be adapted to other operating systems, for the scope of this tutorial it will be designed for Redhat enterprise / Centos ....

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Private Suite Price

Oct 24, 2009

I would like to have a discussion.

We are looking for a private suite, and we have got many offers, can someone tell me what are normal prices per square meter in regular data centers? Just a basic room, no hardware etc.

We received really strange offers and they flip from 400 dollar to over thousand dollar per square meter.

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CPanel Server Suite - ETA

Jun 9, 2008

I was told this was coming out in Spring 08, does anyone have an ETA?

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Plesk 12.x / Linux :: Elliptic Curves Ciphers Suite With Sw-nginx

Nov 9, 2014

I am testing our Plesk linux-server (Plesk 12.0.18 on RHEL 6.6 x64) for SSL high security configuration with Qualys SSL Labs reccomendations (https://www.ssllabs.com/ssltest/).

Best choise today is using Elliptic Curves Ciphers Suite for secure-connection negotiating, but I could not force plesk-contributed sw-nginx to using elliptic curves ciphers suite (sw-nginx-1.6.0-1.14051516.rhel6.x86_64):

when place ssl_ciphers ECDHE-RSA-AES256-GCM-SHA384:ECDH+AESGCM; to nginx server and vhost configurations, then secure negotiation is not established.

Starting from RHEL6.5 Red Hat contribute openssl with EC ciphers - https://access.redhat.com/documenta...erprise_Linux/6/html-single/6.5_Release_Notes (openssl-1.0.1e-30.el6_6.4.x86_64)

OpenSSL on live system shows these ciphers:

openssl ciphers -v | grep ECDHE
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD

I think, the problem is that the sw-nginx is compiled with old openssl binaries without elliptic curves support.Can Plesk development team recompille and release updated sw-nginx package..Сan use genuine nginx package from official nginx repository instead of sw-nginx package?

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DNS Tutorial For VPS?

Jul 16, 2009

Can someone show me a tutorial on exactly how to point a domain name to my VPS? Not just a simple masked forwarding, I want it to actually point to my VPS so that basically [url]is the same as [url]

I'm running Ubuntu & HyperVM,

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VPS Tutorial

Mar 24, 2009

Does anyone know if the VPS tutorial thread (the one that told you exactly how to do everything) was distributed anywhere else apart from WHT? Because of the recent site problems, that thread was one of the lost ones.

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Vps Tutorial

Nov 6, 2007

How do I add a domain name to my vps account? Where is the vps detail tutorial? I brought a vps plan so I could learn at least 100 things about managing my own vps through hypervm and webmin.

If you have a thing or two to teach about managing it, please reply with how to do so and so.

I am at school now. I will get home later and then I can get back to my hobby of teaching myself how to manage a vps. I have a lot of time on my hand to learn how to manage a vps.

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Tutorial Request

May 3, 2007

Can some nice person please write a good tutorial on setting up the game server cpanel addon?

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Best Web Server Tutorial

Apr 18, 2007

I am wanting start hosting my own websites on my own webserver...however my knowledge f running one is very limited.

Any decent tutorials, books, or qualifications you could recommend?

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CentOS 5 Is Same As RedHat 5

Apr 29, 2009

CentOS 5 is same as RedHat 5, is it?

I have heard that CentOS is same as RHEL excepting logo and name changes

If I want to learn CentOS, can I buy RHEL 5 book?

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HAProxy Install Tutorial?

Aug 5, 2008

I am planning to install haproxy on arch linux is there any notes or tutorial?

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Migrating Zero Downtime Tutorial

Mar 18, 2008

Ive looked for a long time now trying to find the perfect tutorial to migrate my clients (on cPanel) to my VPS without downtime. Every tutorial i found doesnt tell you how to make it so you dont have any downtime at all.

I know you can point the DNS from the old server to the new server by editing it through cpanel but i have more than 100 clients and it would be DAMN annoying to edit every single one of them one by one. Is there a faster way? Anyone have a tutorial that i can follow?

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Tutorial To Use SSH Keys Instead Of Password

Jan 19, 2008

A Short tutorial to use SSH keys instead of plain password to login.


1. Logon to WHM and goto Main >> Security >> Security Center

2. Under "SSH Password Auth Tweak" and disable the Password Authentication.

3. Under "Manage SSH Keys" click on Generate new key.

4. Give a Key name and Generate a good password (remember it). Choose KeyType as DSA since it's more secure than RSA.

5. Once done, you will see a pair of public private keys. Authorize the public key to connect.

6. View/Download the private key to your system. If you're using putty it can also generate in relevant format.

7. Save the key in a secure place in your local system and chmod to 600 so that no one can read it.

8. Next, connect to your server:

Code:
root@localhost ~]# ssh -i /path-to-file/file.key root@server.ip.address
It should ask for the password, if you have used in step 4.

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Redhat 5 Or CentOS On My New Dedicated Box?

Dec 20, 2008

I'm getting a new server with ThePlanet and moving away from a reseller account.

My choices are Redhat 5 or CentOS.

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Installing Mono RedHat

Sep 17, 2007

on installing Mono but havnt found any. Tried their installer and it doesnt work at all.

Does anyone know of a tutorial out there that will help or can anyone provide me with step by step instructions for installing it to REDHAT Enterprise 4 i686

I am using WHM but read a lot of horror stories about installing it via WHM unless thats fixed. If it was fixed, how could i do this instead of a manual install?

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RedHat Hosting Program

Mar 28, 2008

Does anyone know how to sign up for the RedHat hosting program where you have to pay monthly for the licenses as opposed to yearly?

I called their support number but that guy asked me to sign up online for the Yearly license. But I know a lot of dedicated server companies have a monthly commitment.

Can anyone recommend their sales rep to me who knows exactly what I'm talking about? You can PM me their details if you want.

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Update Tool On Redhat

Oct 31, 2008

What is the equivalent to yum in the latest Redhat releases? I just got a VPS but it doesn't come with yum.

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Tutorial Zabbix Install On CentOS 5

Jan 19, 2008

Other manual install Zabbix on CentOS 5.

Zabbix for used a vps, this is a problem?

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RedHat's Global File System

Apr 25, 2009

Is anyone here running GFS? The responsibility of managing a small cluster of them is about to fall into my lap, and the only documentation I can find is on Wikipedia, which is troubling. I've got the man pages, but I was hoping for more of a document outlining how it works.

Why would lock_dlm2 or gfs_scand take up close to 100% CPU with minimal traffic on the machine, for example? What do those do? How can I tune it to not do that?

I'm not so much looking for specific answers here about tuning, but am more curious about where I should be looking for documentation. I find it hard to believe that there is none?

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Hitting Connections Per Second Limit Of RedHat EL

Jun 11, 2009

I have a powerful 8 core 8gb ram web server with scsi raid drives running RedHat EL 4. This server handles 2,000 - 3,000 HTTP requests per second via Litespeed httpd without strain (over 60%+ CPU idle time during peak load, under 1% IO wait). As the traffic volume continues to increase I've encountered a strange problem, the symptoms of which are as follows:

- About 1/4 or 1/3 of new connections are not answered by the server - they time out.

- All connections that are answered have exactly 3 seconds added to the time it takes to establish connection with the server (can be seen as "Connecting to ..." phase in FireFox). HTTP response times were tested by Pingdom from multiple locations all over the world.

- The problem is either "on" or "off", it is not gradual.

- Server ping is unaffected during the problem - no delay and no packet drops.

- The problem does not happen during off-peak hours of the day.

If litespeed httpd settings are tweaked to keep as many connections as possible in keepalive state for as long as possible, the problem is avoided, while tens of thousands of connections are kept in keepalive state.

Possible causes that were tested and eliminated: PHP/MySQL load (problem applies to static files exactly the same), CPU / IO / RAM, network uplink, hardware firewall, DNS.

This makes me think that there is some kind of bottleneck of how many NEW connections per second the server can accept. By maxing out keepalive quantity and duration I'm reducing the number of new connections per second. This is a temporary fix that will only work up to a certain point.

After investigation, litespeed staff verified that my litespeed configuration was correct and after some testing said that nothing in litespeed was responsible for this limiting factor. Litespeed process uses relatively little CPU and can definitely handle more volume.

Following sysctl.conf values were increased substantially to see if that will make a difference: tcp_max_syn_backlog, tcp_max_tw_buckets, tcp_max_orphans, netdev_max_backlog, somaxconn, file-max. This didn't produce any results. Disabling syncookies didn't help either. dmesg doesn't have any notices of limits being hit or throttles being applied.

Litespeed staff suggests that likely some limit in linux kernel is being reached. The strange 3 second delay does seem like an "intelligent" DDOS protection strategy of some sort. Perhaps this is some kind of kernel level DDOS protection?

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Exim Wont Work, Redhat ES4

Mar 6, 2007

I have complied exim 4.66 version using the source, now i do not seem to make it work

i am getting the fallowing error when i try send mail

$ exim xxx@xxxx.xxx
test

2007-03-06 12:36:44 1HOeWd-0000SH-EZ Cannot open main log file "/var/log/exim/mainlog": Permission denied: euid=8 egid=12
2007-03-06 12:36:44 1HOeWd-0000SH-EZ Failed to create spool file /var/spool/exim/input//1HOeWd-0000SH-EZ-D: Permission denied
2007-03-06 12:36:44 1HOeWd-0000SH-EZ Cannot open main log file "/var/log/exim/mainlog": Permission denied: euid=8 egid=12
exim: could not open panic log - aborting: see message(s) above

when i do $ service exim restart the service fail to stop and but starts OK.

there is no control panel installed on the box.

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Apache/MySQL Hosting In 2 Locations -tutorial?

Jun 27, 2008

I'd like to have the ability to offer hosting in two geographical and network diverse locations for both Apache and MySQL. Two entirely different instances, with different everything. ie: high avail to the max. Obviously the MySQL part is harder due to the dynamic nature.

I can appreciate the technical aspects of the question - such as data needing to replicate to 2 locations, dealing with static versus dynamic data, etc. In short, there's a few ways this could be done.

I've not been able to find a guide in my Google searches, but I'm sure this is something that has been setup before.

If you're someone with experience in having had set this up, perhaps it would be easiest if we just speak directly and work something out, either via payment or giving you a dedicated server on my network. My AIM name is IGSOBEHELPER.

Please note that I am hoping to start a technical discussion about this, hence I am not posting the message in the employment section. I hope this is not off topic because of this.

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Bs Best Tutorial And Reference Guide For RHEL And GUI Admin

Feb 18, 2008

Is there a Windows GUI software for remote Admining servers that run on Red Hat Linux?

FYI: Currently I use Putty for remotely managing our servers.

So if you can recommend a GUI like Windows desktop software for remotely Admining servers running Red Hat Enterprise, I would very much appreciate that.

FYI: we have like 10 dedicated severs, so a desktop GUI that would allow one to monitor/manage multiple servers would be best. But if the GUI that you think is best can only remotely connect/manage one server at a time, requiring disconnecting to connect to the other server to Admin it, that is fine.


Also, I would love to hear what you think is the best book, best tutorial and reference guide for remotely Admining servers running RHEL? I am not looking for one of those books that are 1000 pages, but something that is a few 100 pages and can be read in 1 month assuming a few hours per day of reading.

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Tutorial Request For Non Control Panel Server.

May 13, 2007

write a tutorial how to set up a server without a control panel. A step by step guide how to set up the dns, add doamins. create accounts, create ftp users, create databases, create db

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Qmail On Redhat Setup For Mail Relay?

Dec 10, 2008

Qmail on Redhat setup for mail relay? (I'm a newbie)

I'm trying to figure out how to enable mail relaying for a specific domain on a Redhat server running Qmail. Can anyone tell me where to look? I searched Google, but am now very confused.

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Hypertown RedHat RHEL 5.2 Server Has Been Going Down Everyday

Jul 13, 2008

For the past two weeks, our Hypertown RedHat RHEL 5.2 server has been going down everyday because of a wierd Kernel Panic problem.

Attached you can see what was displayed on the console at the time of the panic. This is what SoftLayer tech. support team was able to obtain from the console.

We are not using Samba or NFS-based applications.

Here is the server's info:

[kaware3@rannatweb ~]$ uname -a
Linux rannatweb.com 2.6.18-92.1.6.el5PAE #1 SMP Fri Jun 20 02:51:01 EDT 2008 i686 i686 i386 GNU/Linux
[kaware3@rannatweb ~]$ free
total used free shared buffers cached
Mem: 16632176 3244660 13387516 0 234480 1934632
-/+ buffers/cache: 1075548 15556628
Swap: 2096472 0 2096472
[kaware3@rannatweb ~]$ more /etc/fstab
LABEL=/1 / ext3 defaults 1 1
LABEL=/var1 /var ext3 defaults 1 2
LABEL=/boot1 /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sda3 swap swap pri=0,defaults 0 0
/dev/sdb1 /disk1 ext3 defaults 0 0
/dev/sdc1 /disk2 ext3 defaults 0 0
/dev/sdd1 /disk3 ext3 defaults 0 0
[kaware3@rannatweb ~]$ iostat
Linux 2.6.18-92.1.6.el5PAE (rannatweb.com) 07/13/2008

avg-cpu: %user %nice %system %iowait %steal %idle
3.78 0.00 4.41 9.02 0.00 82.79

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 90.93 1784.24 1401.45 2073549 1628690
sdb 156.49 1567.09 179.30 1821188 208368
sdc 47.39 443.82 565.21 515787 656864
sdd 0.06 0.88 0.01 1019 8

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Apache :: Multiple Servers On Single Linux Box Redhat

Nov 5, 2014

I need to configure multiple Apache Web Servers on redhat server. I have copied and extracted Apache 2.2 into redhat server and extracted but not able to install because I don't understand setting prefix. Please let me explain about prefix configuration and how to set it. At the same time I would like to know is it possible to setup 4 Apache Web Servers on same machine if possible then how to. Can we set up different versions of Apache HTTP Servers?

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Case Sensitivity

Dec 20, 2007

Using Red Hat EL4 with Apache 2

Is there any way to setup the server to ignore case-sensitivity? For example:

[url] is the same as
[url] or
[url]

Regardless of what is upper or lower case that it goes to the same directory.

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