Ubuntu Servers :: Configure Clustering For 2 Nodes?

Mar 11, 2010

I want to connect two systems in clustering concept. am new for clustering configuration. I have installed ubuntu 9.10 server edition in two system. what do to the next step to configure clustering in ubuntu 9.10 server edition.

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Server :: Unable To Configure Slave Nodes On Rocks Cluster?

May 28, 2010

I am trying to setup Rocks Cluster on a Cluster containing 1 Master node and 23 slave nodes connected via a Switch. The master node's eth1 is connected to public IP and eth0 is connected to the slave nodes via the switch.

I was able to install the Rocks cluster on the machine, I configured the IP for master through DHCP. When I run the command 'insert-ethers' on the master node, it doesnot get me any slave nodes.

setting up the Rocks cluster on all the nodes?

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Server :: Clustering Mail Servers (CentOS/Amazon EC2)?

Feb 23, 2011

I'm looking to set up a clustered mail server, I kind-of know how I'm going to do it but wanted to check if there was a better way. So we have 3 mail servers, running as EC2 instances on Amazon AWS. We were going to achieve clustering by giving all three a shared EBS storage device to store the mail. The mail would be received by any of the three servers (Via postfix) and could be retrieved from any of the three servers (via dovecot). For receiving mail (SMTP), the domains would have 3 MX records pointing to each of the servers but for sending and retrieving mail (SMTP and POP3/IMAP) the three servers would have one DNS A record with 3 IPs associated (I know when using this method for web-servers, the load gets distributed among the IPs under that record but I'm not sure if this will work for SMTP/POP3/IMAP).

What we want is to have 3 servers that share the load equaly but are completely redundant for all services (POP3, IMAP and SMTP). We also need to be able to scale upwards so if we need to add more servers we can do easily. Also the servers must be perfectly synchronized at all times.

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Ubuntu Servers :: Can A VM Span Multiple Nodes

Mar 3, 2010

I'm trying to work with a project manager and some hardware guys and all of us are trying to get a grasp on the UEC.

1. Can a VM span multiple nodes?

2. If a website scales beyond 100% CPU on a node, does it automatically spill over to another node and start using processing power there?

3. Do I have to rewrite the code of my web app (such as WordPress) so that it works in a private cloud?

4. Does KVM support virtual memory such that when I run out of RAM it uses paging?

5. How is UEC any different than me bringing up several servers with several VMs inside, and then moving VMs around as I need? Is it really a cloud where the VMs exist in a cloud, not necessarily a node?

6. If I power off a node while it's hot, how can I assure myself that the data will be okay?

7. Do I want to use SCSI attached RAID, or NAS, or NFS? We're simply trying to host thousands of blogs and LAMP sites in a way that we can handle spike loads.

8. Do I attach the disk volumes to the cluster controller and then run a command such that the nodes can mount those virtual volumes?

9. Do I need to run another command on the VMs to mount volumes that the nodes can see?

10. What is the role of the storage controller and how is it separate from the cluster controller?

11. How many systems, minimum, do we need to get this tested out?

12. For testing purposes, can I install UEC on an Intel P4 server and then a node on Intel P3 server -- even with some limitations?

13. Let's imagine I have 5 node servers, and one catches fire and is a total loss. Can I get those VMs back and get that data back? What would have to be the proper config to make that happen?

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Ubuntu Servers :: Drop Current Debian VM Nodes In Favor Of 10.04?

Jun 23, 2010

Now that Ubuntu is at a LTS stage with Lucid and is easier to install PV in XenServer, I have been wanting to drop my current debian VM nodes in favor of Ubuntu 10.04. So far I have DRBD8 and OCFS2 all working nicely as primary/primary and I am on the next stage of my setup by installing ldirectord and heartbeat. Can anyone shed some light on heartbeat-gui (hb_gui) as it no longer seems to be in the repositories (since Jaunty)?[URL].. I understand that Lucid now uses pacemaker as part of a clustering suite but I have no idea if I really need it. I really liked being able to run hb_gui and logging into the heartbeat cluster to manage resources via point and click so if anyone has any hints on replacements or newer preferred methods to accomplish the same tasks via point-n-click,

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Fedora Servers :: Creating The Initial Device Nodes?

Sep 16, 2009

I'm putting a server together and have run into a boot up problem. (I thought about putting this in the server forum, but it might be a more generic problem that others have seen and know how to rectify.) The install seems to have gone just fine. I have the /boot partition on an internal IDE drive. The rest of that drive and another are mirrored in a Raid0 configuration (using the Linux software to do that) for data storage. The swap partition is a part of the Raid5 SCSI array that also has the / (root) partition on it.

After installation it would not finish the booting process. I suspected that GRUB didn't like all the Raid arrays and such, but it seems to be fine. I can say that because the machine will boot into rescue mode with the GUI splash screen and I have access to the whole directory tree. I have already searched on-line and following prudent advice, ran the yum update while in the chroot /mnt/sysimage mode. That only took overnight to download and most of this morning to complete. Still no dice. Used vim to delete the rhgb quiet commands in the grub.conf file so I could see where the kernel seems to be hanging.

So right after the "Creating initial device nodes" is a line about my generic PS2 wheel mouse. So I tried a USB mouse. Got more output so tried swapping out to a USB keyboard. Got a little further with more information about input devices, but still stops. Also, I tried a PCI video card just to make sure the onboard video wasn't the problem - no change. So, if someone in the Fedora community knows what loads up or is configured right after the mouse and keyboard, I might be able to figure out what's causing the computer to hang during the boot process.

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Fedora Servers :: Process Of Updating All The Clients Nodes To The Same OS?

Jun 22, 2011

I'm having a problem with NFS. I'm trying to mount /home, which is on the server, to the client nodes. The server is currently running FC14 (64 bit) and I'm in the process of updating all the clients nodes to the same OS. Currently, all the client nodes are running FC8 (32 bit) and are capable of mounting /home on the server. However, the one client node that I have updated to FC14 is having problems mounting /home. I can ssh to the node with no problem however I get the following message:

Could not chdir to home directory /home/myuserid: Permission denied. Now, if I excute the following command: "sudo mount -a" I get no errors and now I can see my home directory.

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Ubuntu Servers :: Network Between Cloud Controller And Nodes Is Required For A Proper Cloud Installation?

Jan 12, 2010

what kind of network between cloud controller and nodes, is required for a proper cloud installation? I mean, Does all machines needs to be in same network, in same lan, or may be in MAN or WAN ? how much should be network throughput? 1Mbit/sec , 10Mbit per sec, or 1Gbit/sec? I ask because I need to know the possibility of running nodes on different locations.

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Ubuntu :: Build An HTPC Using Clustering?

Jun 16, 2011

I'm trying to get an HTPC going, but I don't have any money to purchase a new computer. I have 2 desktops in my possession that I am trying to use: 1 is a 2.4 GHz with a 128 MB Radeon 9800 PRO video card (I think) and 1.5 GB RAM (the system is about 8 years old, but I built it top of the line for back then). The second system is a 3.2 GHz dual core with on board video and 2 GB RAM.The problem is, neither system will run 1080p video's without dropping hundreds of packets producing very choppy audio/video. I was wondering if it is possible to cluster these two systems together to harness both their processing power to run 1080p video? I would just jump in and attempt it, but as I have been reading, it looks like processes aren't actually shared across PC's, but auto determined which PC it will run on based on load, which is an issue since neither can cleanly run the 1080p video.

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OpenSUSE :: Where Is Repositories For Ha-clustering

Aug 5, 2010

Empty: Index of /repositories/server:/ha-clustering:

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Server :: Clustering With No PXE Boot?

Apr 17, 2011

I have some chassis with this motherboard [URL] that don't have PXE boot. What is the best way to cluster them?

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Networking :: Clustering RHEL 5.2 Server?

Mar 2, 2010

My current project environment setup is having a single server, running on RHEL 5.2, that is constantly receiving incoming data (video and text) over a periodic interval e.g. every 30 minutes. Initial in-house testing projected the server will be generally busy, so we decided to incorporate a second server for load balancing purposes. So now, server A and B will need to be clustered. Once that is done, incoming data will balance out between the two server (or at least that is what I will like to achieve. Note, I'm aware that at the switch side, I'll need to do some additional configuration and that part is covered).

I've been reading on Red Hat Cluster Suite and the Linux Virtual Server (LVS) seems the way to go. However, I noted that the LVS solution require at least a two-tier solution, and that would incur 3 additional servers instead of just 1. So here's my questions:- I looked around and probably know the answer, but I'm gonna ask anyway. Is there a one-tier solution for LVS i.e. have anyone tried or whether it's even feasible. From my reading, it don't seem so but just want another opinion. Is there any other way for me to do the clustering (for load-balancing) without LVS?

Sidenote: I'm currently looking at Ultra Monkey and will be trying out in a while. However, the project I'm doing would be rolled out to live site eventually, and my customer is kind of....particular. I'm just wondering if there's a software/application (that need to be purchased) and comes with support.

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General :: Code For Passive Clustering In NS 2.34?

Apr 4, 2011

How can I get the NS Code for passive clustering in NS 2.34

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Server :: Figure Out Ho To Setup EC2 Clustering?

Mar 16, 2010

I am trying to figure out ho to setup EC2 clustering. I am seeing heartbeat as an option. I need something that will monitor the state of a daemon, and not if a daemon is running. For example, say I want httpd to be high availability. Does heartbeat monitor if httpd is not in a hung state, or does it simply do a ps -e |grep httpd? So my question is, how does heartbeat work?

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General :: HA / LB Clustering With Specific Software Requirements?

Jun 16, 2010

I am looking to build up a HA/LB linux cluster with specific software requirements. For hardware, I have a number of dual xeon PE 2650s and would like to use them as efficiently as possible. These are 32bit systems, I anticipate scaling up to 64bit systems when I have a tested, working solution in place. For distro, I am familiar with CentOs, Gentoo and Ubuntu but unsure as to which would be the best foundation, although leaning towards CentOs. For software, I need to realise all the services provided by xampp (Apache, MySql, PHP, Perl, FTP), plus Red5 flash media server.

My current train of thought is;
6 physical servers; 2 Directors/Heartbeat, 2 Apache, 2 Red5
Gigabit private network for connecting the nodes.
CentOs 5.5 on all nodes.
DRDB across the 2 Apache nodes for Apache, MySql, PHP.
DRDB across the 2 Red5 nodes for Red5.

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General :: Apache Clustering On Virtual Machines?

Feb 5, 2010

I am Working On Citrix Xen Server.I have Installed two Virtual Machines(Centos 5.3).Now Apache is Configured and its running on the First VM.Can I Set up a Apache Clustering On those VM?.My Aim is "If Apache On the First VM Down,then Apache on Second VM Should Automatically Start".Is there Any Tutorial to Setup Apache Clustering On Virtual machines.

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Server :: Good Links To Know More About OS Clustering In System?

Dec 1, 2010

Share good links to know more about OS clustering in Linux.

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Server :: Red Hat 5.4 Kickstart / Clustering And KVM Installation Failing

Mar 14, 2011

I added the "@clustering" and "@kvm" keywords to my ks.cfg file but during installation, an error about not being able to find either of these packages popped up and it wasn't installed.

I do see the Cluster and VT directories in my redhat_es5.4 directory along with the Server directory. The rest of the files install just fine.

In doing some net and forum searching, I find a reference to a base.repo file that lists the directories but I'm not sure if it's related to creating a yum repository or if not, should it have been created in the redhat_es5.4 directory.

While I've built kickstarts for several years and am comfortable with the file, this is the first time I'm working with rpms outside the main Server path.

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Software :: How To Install The Clustering Application On Server

May 12, 2010

Having issues installing Clustering Software on server: rhel-x86_64-as-4-cluster I am running the following kernel:

The server is up to date with updates, but I am having trouble installing the Clustering software and don�t know what to do now�
# uname -r


How can I get this installed ?

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Server :: Looking For An Open Source Active Clustering Product?

Jul 12, 2010

I am looking for an open source active clustering product can you please advise me about the best clustering softwares on Linux?

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General :: Write Shell Script For Zabbix Application Level Clustering

Aug 16, 2010

We have zabbix Network monitoring tool installed on two servers ( Master ) and ( Slave ) RHEL 5.4 Servers with being Virtual Ipaddress.We are trying to implement High Availability with Red Hat Cluster Suite.OS level Clustering has been implemented with following cluster configuraiton.

But we need to implement Application level clustering for Zabbix_server process which inturn depends on httpd and mysqld deamons to be running.So I have to check the health of mysqld and httpd with a shell script along with the health of zabbix_server process.Any good tutorials for this ? Any guidlines that I have to follow ?Here I may need to take care of following things when any one of the process goes down

1. Shifhting Virtual IP
2. Shifting /dev/sdb1 ( Shared drive to slave )
3. stopping other services on master
4. starting all the services on slave

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Ubuntu :: ISCSI Login But No Device Nodes?

Aug 17, 2010

I'm running 10.04 64-bit diskless on ESXi, installed as a minimal virtual machine. I want this server to access an iSCSI drive. The machine can view the iSCSI shares with iscsiadm, and can even log into the drive. When I do an iSCSI login, this appears in /var/log/messages:

Aug 17 11:08:21 ubuntutest kernel: [1123295.329972] scsi4 : iSCSI Initiator over TCP/IP

So, it appears that open-iSCSI is working correctly. But no new /dev/sd* nodes appear, and nothing new appears in /dev/disk/by-path. I'd expect to see /dev/disk/by-path/ip-XXXXXXXXX. fdisk -l shows nothing but the boot drive. My guess is that the "minimal kernel" doesn't include some necessary module or driver.

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Ubuntu Servers :: Cannot Configure NUT UPS Client

May 16, 2010

I am running Ubuntu Server Lucid 64bit on an AMD-based system and Ubuntu Server Lucid x86 on a dual P4 HP Netserver. I have a Trust PW-4120M UPS plugged into the AMD box via a serial cable.I have installed nut on both systems from the repositories (with "apt-get instal nut") and configured the AMD system as follows:

driver = megatec


I've tried every adjustment to the config files I can think of but without success. I'm guessing this is a permissions issue but I've been unable to find any info on this after extensive searching of Google. As far as I can tell (ie. I've not installed one!) there's no firewall operating on either machine.

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Ubuntu Servers :: Configure The DNS And Ldap?

Jul 7, 2011

I need to configure the DNS server and Ldap server in ubunru 10.10.

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Debian :: Sendmail On Nodes ?

Jun 17, 2010

I ise debian lenny on both server and nodes. Nodes are in sence of drbl drbl project.

So, my sendmail on server works well but on nodes in syslog i see:


Configuration of sendmail on server and nodes is same and it is:


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General :: Set Anchor Nodes In NS2?

Oct 22, 2010

How to set the anchor node in NS2? How to define the channel propagation model as Log Normal Shadowing instead of two ray ground reflection model in NS2?

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Programming :: Traverse Through The XML Nodes?

Jul 12, 2011

I have a xml file and I read it within a php file with XML dom. This is the node structure of my xml file :



In the comment line, I've got the parent node of the current node. Parent node is "User" node. I would like to obtain the children of this parent node, say "name","surname " etc. How can I do this? Is there any function such as : "$parent_nodes->bringChildren('name')".

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Ubuntu Servers :: Configure DNS To Answer IP Of Eth3?

Feb 11, 2010

My test box is running 9.10 desktop,bind,dhcp,LAMP. Everything is working good, except for one thing. How do I configure the DNS to answer the IP of eth3 (, no matter what the client asked for? If you ask my DNS for google.com, I want it to return I know this can't be that hard, I just can''t figure it out.

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Ubuntu :: Configure A HA Virtual Servers With Windows VMs?

Mar 30, 2010

I have a project in school that the requirement is to show the proof of concept of a high availability virtual servers. the guest operating system for the test case will be a Windows variant and a Linux variant that if the main host that hosts both of this VMs fails, both VMs will be restarted on the backup host. Simple enough with VMware vSphere and citrix xenserver with essentials with their enterprise features, But I am not allowed to use a software that one will need to pay-for or is only a trial version, i need to use an open source solutions, and i am not allowed to use virtualbox.

the school has provided me 2 server class 64bit hardware with intel-vt support, i have my laptop for management tools and to also run a virtual appliance for a iscsi target (openfiler as a vm in virtualbox in my laptop).

I have figured that i will use KVM on a ubuntu server as my hypervisor but i cant find any how-to on how to implement a high availability setup that will run a windows variant as a guest. can some one give me a step by step on how to do this.

from my research it looks like i will need DRBD and heartbeat, but i dont know how to use them and if they are applicable in my needs. I wouldn't probably use DRBD since I have a sudo SAN with my iscsi target, so i can probably use open-iscsi.

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Ubuntu Servers :: Recommend The Easy Way To Configure Web And Ftp?

Jul 12, 2010

What is the easy way to make ubuntu as a web and ftp server? So far i only use ubuntu as development server(LAMP in ubuntu 10.04) Now, i want try to host the server in my office rather then at service provider company.

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