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.
View 3 RepliesI 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.
View 3 Replies View RelatedNow 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.
View 3 Replies View RelatedI 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.
[url]
[url]
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 192.168.0.120 switches when I try to start/stop the any of the Load Balancers.
I just rebuild the kernel for slackware 13, everything works, but root file system which is ext3 is mounted as ext2. Normally I've build ext3, ext4 and so on as modules, not in the kernel... but if I do this, then the kernel mounts the file system as ext2, which is build in the kernel. I also modified rc.modules so I can make sure that ext3,ext4,jbd are loaded, but it doesnt work.
View 2 Replies View RelatedWe are using wordpress with MYSQL. Both the app and DB server are different with 6CPU and 6GB RAM and 32bit processor. We had noticed recently that mysqld process is taking too much of system usage- ranging upto 100% of CPU utilization while having the load of 1200-1600 concurrent users.
Pasting d my.cnf file-
# The following options will be passed to all MySQL clients
[client]
port= 3306
[code]....
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.
I am setting up a high availabilty system on a RHEL 6 system.
I have configured 2 nodes.
dev0301
Eth0:
[code]...
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.
View 3 Replies View RelatedI'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).
View 1 Replies View Relatedwe use round robin DNS service for setting up a high availability solution ? i want to know whether it will work.
View 1 Replies View RelatedI have setup proxy server as squid Now i would like to enable High Availability between two squid proxy servers acting as one.
View 6 Replies View RelatedAt my work, we have an ISP that provides us with 2 connections with different IP addresses but at the moment they don't switch automatically if one fails, and can only work for outbound traffic.I tried to automate this with floating routing table on a CISCO 1711 router but then switching to the second link only happens when there's no longer a signal on the cable that's plugged into the router's interface directly -- and the failure most often happens somewhere in the middle. And that also does not make us available from outside.
Can anyone suggest a better way? Maybe an outside DNS server can have a second IP address recorded for our domain name?I found somewhere suggestions that a loadbalancer could solve that but these appliances are way too expensive.I also thought about using BGP but my router's RAM (128MB) is too small for the global routing table that BGP requires. And I also need an ISP (or better 2 ISPs) that provide BGP service. Before trying to convince others that we need to invest more into this, I'd like to know whether there are no easier ways.
I have a weird performance issue with a centos 5 running a nfs server and a rh8 client. I think the fact that it is rh8 client should be downplayed. It is just that with rh8 client the performance degradation seems more clear. See test details below OS in server is Centos 5 x86_64 kernel 2.6.18-92.1.22.el5
1Gb connection between machines File to test over NFS is a 1GB file. First of all I wanted to measure how the network alone performs while using NFS. So in the server side I run a "cat" command on the 1GB file to /dev/null. Please note that the disk read speed is about 98MBs. At this point the file system has the 1GB file cached in memory. In the client side a "cat" on the same file gives me a speed of about 113MBs. It seems then that the bottleneck in this instance is the network and it is very close to nominal speed. So the network performance is really good. (BTW I know that the server got that file from cache because a vmstat or iostat shows no disk activity.)
The second test is reading from disk with no caching involve. In the server I flushed the 1GB file from the memory. For instance by reading another 5GB file and I repeat the same thing as above in the client (a cat on the 1GB file). Now, the server has to go to disk.(vmstat or iostat shows the disk activity). However the performance, now, is about 20MBs, I was expecting something closer so 90MBs. (since the reading speed in the server in the first test showed 98MBs).
This second test was repeated for ext2, ext3, xfs with no significant differences. A similar test using a RH8 NFS server and client gets me close to 60MBs for a 1GB file not cache by the file system in the serverSince network speeds and disk read speeds are not the bottlenecks ... what or where is the limiting factor then?
We are trying to define an appliance for an application server so I would like to know which should be the best file system type for this kind of use, basically our web applications uses libraries of 50 KB and our web apps.creates temp and logs files not bigger than 3 MB.
View 1 Replies View RelatedI have a remote ftp serwer, witch many of disks, something SATA, some IDE... There are ext3 filesystems. And a lot of files and direcotories/subdirectories. Tell me, which filesystem is the best for serwer like this? I'm not interesting on efficiency... The most important thing is failure-free. On ext3 sometimes is problem witch 'dirty' filesystem, in that case I must handy run e2fsck to fix this. Is any option to automate this, or any power-down proof filesystem?
View 2 Replies View RelatedI am trying to build a multiseat linux system(Build a Six-headed, Six-user Linux System LG #124). I am posting some outputs output of lspci | grep VGA
Code:
00:0d.0 VGA compatible controller: nVidia Corporation C61 [GeForce 6150SE nForce 430] (rev a2)
02:00.0 VGA compatible controller: nVidia Corporation G98 [GeForce 8400 GS] (rev a1)
ls /dev/input/mouse*
Code:
/dev/input/mouse0 /dev/input/mouse1 /dev/input/mouse2
more /proc/bus/input/devices
[Code]...
I am having trouble in configuring xorg.conf. I am running Suse 11.3 desktop on my PC. Also, I have one onboard nvidia graphics 6150SE and I have put one nvidia 8400GS 512Mb in the 16X PCIe slot for the additional seat...
So kindly tell me what should I do now or what things are missing ?? For any further info abt my PC plz tell me to post outputs(specify the commands for the same..)
I will be relocating to a permanent residence sometime in the next year or two. I've recently begun thinking about the best way to implement a home-based network. It occurred to me that the most elegant solution might be the use of VM technology to eliminate as much hardware and wiring as possible.My thinking is this: Install a multi-core system and configure it to run several VMs, one each for a firewall, a caching proxy server, a mail server, a web server. Additionally, I would like to run 2-4 VMs as remote (RDP)workstations, using diskless workstations to boot the VMs over powerline ethernet.The latest powerline technology (available later this year) will allow multiple devices on a residential circuit operating at near gigabit speed, just like legacy wired networks.
In theory, the above would allow me to consolidate everything but the disklessworkstations on a single server and eliminate all wired (and wireless) connections except the broadband connection to the Internet and the cabling to the nearest power outlets. It appears technically possible, but I'm not sure about the various virtual connections among VMs. In theory, each VM should be able to communicate with the other as if it was on the same network via the server data bus, but what about setting up firewall zones? Any internal I/O bandwidth bottlenecks? Any other potential "gotchas", caveats, issues? (Other than the obvious requirement of having enough CPU and RAM).Any thoughts or observations welcome, especially if they are from real world experience in a VM environment. BTW--in case you're wondering why I'm posting here, it's because I run Debian on all my workstations/servers (running VirtualBox as a VM for Windows XP on one workstation).
I'm planning to add 1tb sata disk to my lovely file-server under ubuntu 10.10,what i want is use this disk as additional storage for network user,indows and ubuntu?I mean when my ubuntu server down (worse case) I can easily take out the disk from ubuntu machine and plug in on windows machine
View 2 Replies View RelatedCan windows read files from a home file server with an ext4 file system? or do I have to partition the drive with the server (ext4) and an ntfs partition with the files on?
View 4 Replies View RelatedSome searches seemed to indicate that it's been awhile since there's been a build thread, so I thought I'd start one. I'm looking to replace a six-year old machine (Athlon XP 3200+ processor (introduced in 2003), integrated graphics with no dedicated graphics card). I'm rocking Windows XP Home Edition (32 bit).
I'm not a "computer hobbyist," far from it. I use my machine mainly for browsing, word processing, and business (QuickBooks and Turbo Tax). It is a tool. I don't really enjoy fiddling around with computers. My current machine is now barely able to support a good research session on the 'Net anymore, the little processor seemingly gagging on the heavy flash content you see everywhere nowadays, the 2GB (the most she'll take) of RAM easily filled.
I'm planning some rough travel international motorcycle trips (see my motorcycle build thread here (don't worry about registering on this motorcycle forum.....they are good folks and I've never gotten any spam from them) and purchased, a while back, an Asus eee PC 901 with the OEM Xandros (a bastardized offshoot of Etch) loaded to use with those trips. From learning that OS, I saw for myself the benefits of Linux (vs. Windows). Of all the distros, Debian is the most attractive to me (even though I'm currently rocking Puppeee (new version) on the 901.....it makes that little machine zoooooom!) as I really like the package management system, the logic, and the stability. I also like the feeling of personal responsibility that comes with Debian.
So, back to the build. I'm currently planning on it being a pure Debian machine. I'm ready to move on from Windows, for reasons I don't have to explain here. I stated that I don't particularly care to "play" with computers, but I'm willing to put in some front end labor in order to enjoy a long-term, low-maintenance relationship with my new machine. With that philosophy in mind, I'm looking to build a machine that will serve my simple needs for ten years(!) So, since the costs will be spread out so far, I'm ready to drop some serious (for me) coin on this project in order to avoid having to go through what is, for me, a rather painful process of research again any time soon.
iam trying to sync file server data into backup server machine by command- rsync -avu path/of/data ipaddress-of-backup-server:/path/where/to/save after running it ask for root password and manually it is successful.but i want to make it automatic.for that i also tried cronjob and also generated authentication key but iam not successful in login automatically..anybody know how to authenticate root to login for storing data in backup server.
View 14 Replies View RelatedI am working on linux server with below specifications.Linux EDT 2008 i686 i686 i386 GNU/LinuxWhile checking the status of the server using the command 'opmnctl status' and when server is down the output is not getting redirected to file.I m using the command as,opmnctl status > abc.txt.
View 2 Replies View Relatedi have a problem here whereby some 20 over servers in my network is having regular Offset values. The configured threshold is 55, but whenever it exceeds 55, i have alerts coming in. My questions are;
1)how do i find out what is causing the Offset value to be high?
2)i have workaround in mind, that is to create a cronjob to restart the ntp daily, or hourly - is this workaround an acceptable practice?
My main concern is to find out what is causing the frequent offset spike/increase. real example from my servers:
[Code]....
I have install 5.5 kernel in rhel and after rebooting got the error to control+d to continue or rootpassword. I have done the same but df -h not showing the lvm filesystem.I have tried to remounnt but showing resource busy.I have rebooted on the previous kernel but getting the same issue.Its a VM.df -h showing only/dev/ mapper/ vg_osdata-lv_root /
View 10 Replies View RelatedI have a question regarding extending file system. We are using RedHat 4 with update 8.Is it possible to extend an file system with GFS file system type while at the same time the same file system that need to be extended is used as an NFS file system? Is it necessary to stop the nfs daemon before extending the GFS file system? If it is necessary to stop nfs daemon, what can happen if it is not stopped prior extending?
View 1 Replies View Relatedon an old server of mine, as soon as apache is started, the load average that I get to see with 'top', that normally is under 1, now just steadily climbs up and up to easily 150, in fact disabling the webserver from serving any webpage. I've checked netstat, and I'll try to upload the output. The ip's that are in there I've blocked with iptables. But that doesn't help or so it seems. I see nothing weird in the error logs. As soon as I stop apache, the load goes back to normal. As soon as I (re)start it, up it goes again. What can cause this and how do I get rid of it?
p.s. It's an old server, fedora3 or so, and I've got a new one to which I'll transfer the domains, but until that's completely done, I'd like this one to run as it has for years...
The load average is almost 1.06, but cpu is not 100% utilized... I am just wondering why load average is 1.06 in that case still ? (well i monitored cpu for long time, it never exceeded above 40%)can anyone explain the reason behind it ? Also is the system over utilized in this case ?
View 3 Replies View RelatedI am having Red Hat LINUX 5 Enterprise Server and facing problem regarding very very high server load (load average is going high up to 60-70)due to which server is getting hang.
View 7 Replies View RelatedIn our server,top shows "si" with high number! softirq is very high on this server,approximate 90% on one core. How can I determine reason of this problem? Is there any way that I can determine cause of these softirq?what application or hardware generate these softirqs.
View 1 Replies View Related