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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Aug 9, 2011
I have a box currently setup to share files on my network and for the most part its great. However when multiple people request files my 1gb speeds drop. I have extra 1gb NIC's to use but have no clue on how to spread the load of transfering files between multiple nics. Is this even possible? or does this happen automagically?
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Dec 3, 2010
As I was updating machines today, I was wondering... Is there some way to cache the RPM files locally that yum is grabbing? Like many, I have a number of VMs I run, and it most updates are the same between the nodes. I'm guessing I'd need some sort of http cache? Just looking for pointers, not sure what I'm looking for, however.
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Apr 7, 2010
My requirement is to route ssh sessions from a single head node to multiple slave nodes. So what i want is, for a client there is just one point of entry (master/head node) to ssh into, it evaluates the load on the slave nodes connected on to internal network and routes the ssh session, kind of a ssh load balancer. what open source solution i can apply for my problem?
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Jan 8, 2010
So, at the moment I have a 7TB LVM with 1 group and one logical volume. In all honesty I don't back up this information. It is filled with data that I can "afford" to lose, but... would rather not. How do LVMs fail? If I lose a 1.5TB drive that is part of the LVM does that mean at most I could lose 1.5TB of data? Or can files span more than one drive? if so, would it just be one file what would span two drives? or could there be many files that span multiple drives drives? Essentially. I'm just curious, in a general, in a high level sense about LVM safety. What are the risks that are involved?
Edit: what happens if I boot up the computer with a drive missing from the lvm? Is there a first primary drive?
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Apr 7, 2010
My requirement is to route ssh sessions from a single head node to multiple slave nodes. So what i want is, for a client there is just one point of entry (master/head node) to ssh into, it evaluates the load on the slave nodes connected on to internal network and routes the ssh session, kind of a ssh load balancer. Do you have any idea what open source solution i can apply for my problem?
I have tried using LVS piranha, it works well for http and https load balancing but not for ssh load balancing.
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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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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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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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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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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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Feb 7, 2011
I'm looking at setting up a couple automated systems: Here are a few examples:
* Internal accounting system to download and process emails
* Public web server to visit
I could put each system on its own separate box -- for example, it's generally good practice to separate anything that external users have access to (such as a webserver) from internal processes such as accounting. Now, rather than dishing out the money for two separate servers, could I get away with just installing new instances of VMWare on the same box for each system?
To give you an idea, these are not large scale computationally sensitive systems. The accounting one is simply downloading and tallying emails, and the latter is just a webserver with maybe 5 hits per day on a good day. I could definitely pick up a new box for say $50, but I wanted to know the general practice of using VMWare on the same box versus two separate boxes.
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Dec 3, 2010
I have two 1TB drives I want to span for the storage area of mythtv. Not for swap, system or anything else, just storage of myth's files.
My mythserver died and I'm rebuilding from scratch, in a previous life I'd used mdadm and a software raid 0. But this was always a bit of a pita and I'm told it's not necssary. What's the most efficient method of using two drives and could someone point me towards a how to on the subject?
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Apr 1, 2011
I'm curious if anybody can shed some light for me in this department. We're in a large environment with a Windows DHCP Server. We have been tinkering with LTSP on Edubuntu as thin and fat clients. It works great, but right now we just have 1 server handling the lab, which works fine unless we want to expand, which may be very possible.
These are the instructions I received:
Login to your windows server and load the DHCP configuration screen
Create a DHCP reservation for the MAC address you obtained
Add the configuration options below to enable the machine to boot from the LTSP server
017 Root Path: /opt/ltsp/i386
066 Boot Server Host Name: <ip address>
067 Bootfile Name: ltsp/arch/pxelinux.0 # Specify CPU architecture in place of 'arch', for instance 'i386'
From: [url]
I'm curious, what if I want to have multiple Ubuntu servers on the network that I want to have bootable? For example, let's say I have 3 labs, and 3 servers. Server A to Lab A, Server B to Lab B, and Server C to Lab C. I want all C's computers to boot to C, and B to B, A to A, etc.
1 - How would I add multiple entries on the Windows DHCP Server to allow all 3 (A B C) servers to boot?
2 - How would I be able to isolate the clients so ONLY Lab A clients boot to Server A, etc?
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Jan 15, 2010
Can I somehow span the gnome panel to my other monitor, or to add a new gnome-panel to my second monitor?
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Oct 10, 2010
How can I make a window span over both monitors? I have the monitors configured using the KDE monitor setting tool. I need specifically full-screen (for presentation purposes) or at least a maximized window. Kwin insists on locking the window on one desktop.interestingly it really is Kwin preventing me to do this. If I get rid of KDE and just launch a plain X session, the window maximizes correctly.
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Aug 27, 2010
I recently read about recommendations for increasing the life span of optical media as follows:-
1) storage at constant temperature in the range 41F-68F with relative humidity 30%-50%
2) no exposure to direct sunlight
3) marking only with water soluble markers
How water soluble marker becomes a factor in the life span of an optical media ?
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Jan 19, 2010
I currently have a group of 3 servers connected to a local network. One is a web server, one is a mysql server, the other used for a specific function on my site (calculation of soccer matches!).
Anyway, I have been working on the site a lot lately but it is tedious connecting my USB hard drive to each computer and copying the files. This means I am not backing up as often as I should...
I have a laptop connected to this same network that I use for development so I can SSH into to the computers, is there any software for ubuntu that can take backups of files that I choose on multiple computers? I know I could rsync but is there something with more or an GUI?
Then I can just every 2 days move the most recent backup from my laptop to the USB drive. Then I will have the backup stored in 2 places if things go kaboom somewhere.
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May 20, 2010
I'm running Ubuntu Server 10.04 and have a secure (SSL/TLS) FTP server on it. However, I'd like to use this FTP server to update programs I made using Microsoft Visual Studio. Unfortunately, in Microsoft's infinite wisdom, secure FTP servers cannot be used. Rather than use an insecure FTP server, I want to set up my secure FTP server to be able to access whatever I need to on the machine, and then add an insecure FTP server that only has access to the directory where I put my update files. I am currently using vsftpd as my FTP server. Is there any way that I can set up two FTP servers on this single machine?
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Jan 6, 2009
Based on much internet searching, I've found that I was/am not the only one struggling to get Fedora 10 to span the display across a laptop screen and an external monitor. So what I have here are instructions to do so:
1) Fedora 10 does not (by default) use an xorg.conf file to configure the display. So type the following command into the command line: yum install system-config-display
2) Go to the menu bar and navigate to System>Administration>Display. I left all the display settings as they were and hit OK (repeat this step twice to make an xorg.conf backup). This will generate the xorg.conf and back up files in the directory: /etc/X11/
3) Now we need to see what size virtual screen you need. Type the following command into the command line (without the quotes): "xrandr --output VGA --auto --right-of LVDS" It will tell you that you are asking for a certain size screen. Write those numbers down. I have a 1600x1200 external monitor so my number is 2624x1200 (1600+1024 x 1200).
4) Change directories to /etc/X11 and type (without the quotes): "sudo gedit xorg.conf" Scroll down to where the device section is. Mine looks like this:
Section "Device"
Identifier "Videocard0"
Driver "intel"
EndSection
Some videocards need to turn 3d acceleration off in order for dual screens to work. It is important that you turn off desktop effects if you turn off 3d acceleration!!! So under the driver line add the line (with quotes): Option "NoAccel" "true" Mine looks like this:
[Code]....
Scroll down to where the screen section is, and then find the display subsection. It should look something like this:
[Code]....
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Jul 7, 2010
I am having a Dell ST2410 LCD and a laptop IBM.I want to span my desktop so that some portion is on laptop and some on external monitor. I tried xdmx but it did not worked.
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Mar 18, 2011
I am making online Myproject using java in which you can make your porject online or with your team, my problem is that when i drag one component from one page it disappear from another frame & i am unable to solve the problem that if the user don't have install java than myproject in not useable i am giving a span sort of code of my project:
[code]...
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Jun 1, 2009
I upgraded to FC10 from FC8 and my Gnome-panel no longer spans both screens in my dual monitor configuration. This worked fine in FC8, and I can't seem to figure out how to make this config work in FC10.
I've tried Xinerama and Twinview, and various configurations in xorg.conf, and cannot seem to make it happen.
How to make both my panels (top and bottom) go across both screens?
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Jul 19, 2010
I would like to have multiple php.ini files for multiple sites.
I've a production site (word wide available) and a test site (available to some selected IP-addresses). I would like to set some different PHP settings for the test site, for example, 'error_reporting' and 'display_errors'.
Is this possible? I'm not looking for some CGI hack, unless it wouldn't work any other way.
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May 20, 2009
How can I start multiple X servers by logging into same user and using same desktop environment like KDE or GNOME. Is this possible by editing .xauthority, .xinitrc etc files?
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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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Mar 27, 2010
So I've got a home server hosting a website for my restaurant, but I'd like to get another server up to get some redundancy going.
I have another machine I'd like to set up at another location to take over retrieving requests sent for the website whenever my home server goes down. I've got my domain through [URL], but the domain is hosted through [URL] for their dynamic dns service (because im not using a static ip).
So I'm guessing having another server set up is just a matter of setting up dns records, however I don't know where to begin with setting that up. Any words of wisdom out there?
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May 25, 2010
I'm curious how I can use a Windows client with two separate accounts to connect, at the same time, to a SMB server hosting two shares. (Provided permissions and accounts are all in order)
Scenario:User1 is always logged onto a Windows client mapped to a Public share on a Linux SMB server.I need a way to keep User1 connected to the Public share and then when needed, allow User1 to provide User2's credentials to connect to a Restricted share.The only way I've been able to do this is to disconnect from the Public Share then reconnect to the Restricted share using User2's credentials. (This is the issue because I need to keep User1 connected to the Public share).Is this a limitation of SMB? Or am I missing a configuration? Please point me in the right direction
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May 27, 2010
I have a test server on which I'd like to run up to 30 separate instances of a program as daemons, each running on a different IP address bound to the server. I've created a init script that takes an additional command line parameter - the last octet of the IP address. For example:
Code:
sudo myprog 40 start
sudo myprog 41 start
This would run instances of the program on IP addresses 192.168.1.40 and 192.168.1.41 respectively. But it's looking like this approach isn't doable if I wish to have any or all of these run at startup, as the links in the rcN.d directories can only link to the init script, not pass a parameter.
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Jun 6, 2010
(tangent to my other thread "Karmic -> Lucid not booting"). I have four hard drives on a Lucid box, and (as it happens) the fourth drive is the boot and root. Could I also install grub on the other three (ext4) hard drives, keeping the same root? Will this disturb the data there? How would the machine decide which copy to use, anyway?
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