CentOS 5 :: Create A High Availability Environment Between Two Machines?

Jul 9, 2009

Is there a way to create a high availability environment between two CentOS machines? I don't mean just the HTTP service or just one other thing. I need the entire server synced in real time ready to take over if the next goes down.

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CentOS 5 :: Configure An ISCSI / DRBD High-availability Cluster

Jul 23, 2010

I'm trying to configure an ISCSI/DRBD high-availability cluster and I'd like to know what is the best option between OpenAIS and Heartbeat. I've seen they both are included in Centos Repos, yet OpenAIS requires installing 2 addition repos to install Pacemaker (EPEL and Clusterlab repos).

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Server :: How To Achieve High Availability Website?

Apr 7, 2011

I have 2 web servers running apache hosted at 2 data centres on 2 different IP ranges.The 2 servers are an exact clone of each other hosting www.example.com.What I am trying to achieve automatic failover. Say my first data centre gets wiped out, how would customers reach my website on my second server in the second data centre by still typing www.example.com?The aim is for the customer not to notice any difference.

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Debian Configuration :: Fault Tolerance / High Availability

Aug 19, 2015

I work for a data center where we use a whole lot of VMware's "Fault Tolerant" Solution. As a personal project, I want to piece together an alternative solution out of open source software.

Here's my punchlist:

*Configure Debian (or build from scratch) to be as slimmed down as possible so that I may call it "Just Enough OS" or "baremetal"
*Install and configure Xen with XenMotion
*Prove that both the physical and virtual fail-overs work as intended
*Prove the automatic repair of failed virtual machines.

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Server :: Concept Of Fail Over High Availability Mode

Jun 25, 2009

Now that I have setup a proxy server, as a next step I want to run it in fail-over high availability mode, so that if one proxy is down due to any reason, second proxy should automatically be up and start serving requests.

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Red Hat :: RHEL 6 High Availability Fencing Drack Not Working?

May 12, 2011

I am setting up a high availabilty system on a RHEL 6 system.

I have configured 2 nodes.


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Networking :: Use Round Robin DNS Service For Setting Up A High Availability Solution?

Nov 16, 2010

we use round robin DNS service for setting up a high availability solution ? i want to know whether it will work.

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General :: Enable High Availability Between Two Squid Proxy Servers Acting As One?

Sep 29, 2010

I have setup proxy server as squid Now i would like to enable High Availability between two squid proxy servers acting as one.

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Server :: High-Availability HTTP Load Balancer With HAProxy & Heartbeat On RHEL 5.4

Oct 15, 2010

I am trying to setup a High-Availability HTTP Load Balancer With HAProxy & Heartbeat using the below links.

I have all RHEL 5.4 servers hosted on VMWare.


This is the scenario, as given in the links as wells as my setup.

Load Balancer 1

Load Balancer 2

Web Server 1

Web Server 2

I have followed all the steps mentioned in the links religiously except the 2.2 here, in which it is asking to configure the vhosts. I could not really understand , what is to be placed in /etc/httpd/conf.d/vhosts.conf file and in which Web Server.

Due to this step only, I think I am failing in Failover test given in Point 4.1 here. I am able to open the webpage by [url] which gives the content of Web Server 1 (http1.example.com). But, when I try to shutdown the http service (to check failover), it does not shows the contents of Web Server 2 (http2.example.com)

Although, I am able to succeed in Failover Test 4.2, in which shared IP switches when I try to start/stop the any of the Load Balancers.

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Server :: Build A Redundant, High-availability File Server System?

Mar 23, 2010

I am kinda stuck while providing solution for the above problem. I have achieved the fail over using keepalived but not sure how can we replicate the data from one server to other seamlessly and have them in sync with each other. My prime requirement for this project is end user should not notice the fail over and replicated copy of data should be available on the secondary as well.

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General :: Test A Code That Needs To Have High DiskIO And DiskBisy In System Environment?

Oct 13, 2010

I need to test a code that needs to have high DiskIO and DiskBisy in a Linux environment. Is there any way that i can use to test this urgent need of mine.

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Networking :: Feasible / Desirable To Setup A Network Of Virtual Machines To Use As An Environment To Learn Networking?

Nov 18, 2010

I've been learning linux for a while now with half an eye on making a career out of it in future. One sizeable gap in my knowledge at the moment is networking. Is it feasible/desirable to set up a network of virtual machines to use as an environment to learn networking? My budget is non-existent so I was hoping to be able to get a basic understanding of the principles from installing a few desktops, a virtual gateway etc on VMware workstation on my laptop, and doing a lot of reading online.

Is this feasible, or will I just end up learning about virtual networks instead of real ones? Also how much power would be required, because my 3GB RAM lappy has just gone bang and all I have now is a (new) 1GB RAM lappy.

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Fedora Networking :: Create A LAN Where The Machines Connected Have A Name Binded With The IP's?

Mar 9, 2010

How can one create a LAN in fedora where the machines connected have a name binded with the IP's . The names corresponding to the IPs are stored on a host which can act as a domain name server. The host can have a name of something like test1.test1.org. I am actually working on Globus toolkit where I will be providing grid services to clients. For that I needed a static IP registered with a domain name service. But since I required it only for local network so I thought to create a Local network myself.

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Networking :: Create Simple Pppd Tunnel Between Two Machines?

Nov 26, 2010

I'm looking for a tutorial on how to create a simple pppd tunnel between two machines. I've found alot of tutorials about pppd over ssh (using the pty option) but for the purpose I just want a simple pppd tunnel.

host 1: lan ip running slackware 13.0
host 2: lan ip running slackware 13.1

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CentOS 5 Server :: Building VMWare Virtual Machines From CentOS Mail Servers?

Oct 12, 2010

I have a few mail servers, a mail log server and a web server running on Centos 5. Now I have a task: to avoid accidental crashes on the production servers while installing updates, my boss asked me to do clones (these clones will all be VMware virtual machines) of the servers (EXCLUDING the actual e-mails and log contents) and then to run those clones on VMWare Server. This way, first I will install and test updates on the clones and - if they will be running without crashes - I will apply the updates on the real production servers themselves.

I have already installed VMWare Server 2.0 I have a few questions: How do I build the virtual machines to exclude the actual mail files and mail logs? Can I use VMware Converter for this purpose, or do I have to use another program? How do I actually do this cloning? Is there a tutorial on how to do this?

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Programming :: BASH - Create User And Password On Multiple Machines

Aug 9, 2010

I'm trying to write a script that will prompt the user for a username/password, then create that user/password in the right groups on all my machines. I know this is kind of a long way around to avoid a NIS server, but I like making my life more difficult.

This is what I have so far:


the script has 2 problems: The "if" functions return an error and do not compare the strings successfully. whatever password is entered does get applied properly and the user is unable to login

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CentOS 5 Server :: Attach Windows Xp Machines To A CentOS DS?

Sep 22, 2011

I'm experimenting with CentOS DS and have a question.Is it possible to attach windows xp machines to a CentOS DS? If so, how?!I think I've skimmed most of the documentation out there. Did I miss something? Is this not what the DS was designed to do?

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General :: Create A Desktop Environment Theme?

Apr 28, 2011

I have a tried looking at google up, no luck, but maybe i am blind, anyway. I want to looking for, I want to create a theme and icons, too.

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Programming :: Create A User For Php/MySQL Under Ms Win Environment?

Jun 30, 2010

create a user for php/MySQL under ms win environment?

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CentOS 5 :: Centos-approved Way To Handle Group Environment Configuration?

Mar 10, 2010

What's the centos-approved way to handle group environment configuration? Let's say there are users in, oh, 4 different groups. Let's use the usual suspects:


and I want to set up environment variables and maybe some pathing that are specific to a given group. So that when 'joeblow', who is a member of group 'warehouse', logs in, the pathing and environment variables (and whatever else) that is needed for users in the 'warehouse' group is set up and configured.

What I was initially looking for was an /etc/groups.d, and in /etc/groups.d is


As part of the login process, the group memberships for the login username would be examined, and for each hit the respective /etc/groups.d/ script would be run. I'm not seeing anything like that, so I'm assuming centos uses some other mechanism, but I'm obviously not using the proper keyword mojo. Can someone point me to where this mechanism is described?

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Ubuntu Servers :: Create Secure Shell Environment For Users?

Feb 25, 2010

I was planning on using my VPS to grant some of my friends shells. The problem though is that I don't want them doing crazy stuff on it, like using up all my RAM or disk space. I would like to limit them to a very small 25 mb disk space, and allow them only certain application in /usr/bin like python perl irssi screen etc. I do NOT want them to be able to cd out of their home directory. I really want this to be setup like the shell provider SHellium. I can setup the FTP and SSH stuff myself.

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General :: Create Virtual Machine For Web Development Test Environment

May 31, 2011

I'm looking into creating a virtual machine to mirror a web hosting environment I pay for. Long story short, I need a lab so I am not taking down the live site with my mistakes.Questions:

1 - What OS is most commonly used and / or best for running apache web server?My paid host is running "Operating System =linux; Kernel Version2.6.28.5-grsec-sg2"

2 - What is the best open source solution for creating a virtual linux machine on a box running XP?

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Server :: Script Query - Create A Folder With An Environment Variable?

May 18, 2010

I am busy learning shell scripting, and I managed to get my first few right, but now I am trying to do something that I know how to do in Windows, but not in Linux. Basically, during a file copy, I want to create a new date for each folder on a daily basis to copy backups into.so, in windows the syntax would be "xcopy %systemroot%ackupslah.blah \servernameackups\%date%"in linux I am running a "cp blah.gz /mount/blah" I want to create a folder with the date based on the current date.anyone know how to get the same right in shell script?

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Debian :: Create A Sandbox Environment On LAMP Server For PHP/MySql Development?

Mar 5, 2011

I need to create a sandbox environment on my LAMP server for PHP/MySql development. Anyone who could point me in the right direction or share their insight?

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CentOS 5 :: High CPU Utilization For All Processes?

Apr 9, 2010

I am getting a strange problem with my new machine (P4 3Ghz, 1 GB RAM DDR333). The machine is an industrial PC. Firstly I had installed Fedora Core 2 on it. It ran superbly without any problem. I tried to load Redhat Enterprise Linux WS4 (Update 2 as well as Update 5) on it. But the PC was giving high CPU utilization for each and every task. With-out any application running both the cores shows utilization around 10 %. But when i try to my application, the CPU utilization in one of the cores goes to 100 % for majority of the time. This is causing my appilcation to run slowly when compared to the same application running on the same machine under fedora core 2. (CPU Utilization around peak 17 % in either of the cores in Fedora Core2) Recently I installed Cent OS 5 on it. But the behavior of the PC remains the same as of Redhat Enterprise Linux WS4. Some-where on the forums I had read about the RAM size. So i tried to downgrade the RAM from 1 GB to 256 MB. But the problem remains the same. I think it has to do with some kernel tweaking.

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CentOS 5 :: High Pagefaults In Server?

Jan 19, 2011

I can able to view there is high amount of memory & swap usage on the server, upon investigation found that there are high no of page faults happening on the server more than 300 .. Is there is any option to fix the page faults , and also how to release the locked memory with out using drop_caches..

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CentOS 5 :: High CPU Usage On Clock_gettime() C - C++

Apr 5, 2011

I am calling clock_gettime() function to get time with nano seconds accuracy. My program works fine on Ubuntu but have high CPU usage problem on CentOS 5. it takes 40% CPU on Ubuntu and 90% CPU on CentOS. Kindly give me solution so that I can reduce high CPU usage problem on CentOS. You can build this code like: "gcc -lrt gettime.c -o gettime.e"


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CentOS 5 :: High CPU Load On Dell PowerEdge2950

Apr 5, 2009

I recently installed Centos-5.3-x86_64 in a PowerEdge2950 machine, to serves as an ftp server using proftpd-1.3.2. I noticed that the CPU load is much higher than the days when I was using RHEL-4.7-X86_64. In the past, CPU load get higher than 100 only when there're about 400 online users. But in Centos-5.3, the CPU load gets higher than 150 when there're 200 users.

The details of the server machine: Intel Xeon E5430, 16 GB RAM, 1.8 TB as a RAID disk, 400GB hardisk used to installed the system.

More details:

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CentOS 5 :: Performance - High Context Switches - When We Run The App, Get This Up To The 500,000 CSs Per Second?

Dec 18, 2009

I have a user complaining about performance:-

Quote: At times on our server, during more-or-less idle moments, context switching is around the 2000-3000 mark.When we run the app, we can get this up to the 500,000 CSs per second. Not only this, but at the same time, the CPUs go to >60% system (the kernel is having to do all that context switching after all), leaving only around 30% for user space. We think it is a possibility that the massive context switching is contributing significantly to our performance issues.

The server is a HP DL580 G5 with 4 x Intel Xeon E7340 @ 2.4Ghz.My issue is that I don't know if the contect switching is a problem or not.From what i've read those values are not necesserilly cause for concern.

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CentOS 5 :: Determine What Is Causing High Load

Sep 12, 2011

I am running a CentOS 5.6 32 bit installation under VMWare ESXi and have been experiencing some very high load values from time to time. The server is running multiple installations of gameservers, and the load fluctuates from around 1 to 9, with more or less the same amount of players playing (give or take 5-10 of a possible 80). I've been running DStat with almost all possible metrics, and, except for the large fluctuations in load, nothing else out of the ordinary seems to happen when load is rising. (Log data can be provided, if anyone wants to see it). Disk IO, Network throughput, memory consumption, CPU usage, process count, all stay at the same levels when the load is 1 as when it is 9. How I can begin to troubleshoot this, and find out why the load goes to such high values?

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