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Linux - Virtualization and Cloud This forum is for the discussion of all topics relating to Linux Virtualization and Linux Cloud platforms. Xen, KVM, OpenVZ, VirtualBox, VMware, Linux-VServer and all other Linux Virtualization platforms are welcome. OpenStack, CloudStack, ownCloud, Cloud Foundry, Eucalyptus, Nimbus, OpenNebula and all other Linux Cloud platforms are welcome. Note that questions relating solely to non-Linux OS's should be asked in the General forum.

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Old 06-02-2010, 04:56 PM   #1
michaelux
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XEN, KVM, Virtual iron, some doubts


Hi all.

I have been reading a lot the last days about virtualization and about the differents flavors. But there is many information and sites where some times I get confused.

XEN use paravirtualization and use a host OS Dom0,with the hypervisor over the hardware layer.

Does XEN can be used as FULL virtualization like kvm?


KVM is FULL virtualization, and it use a host OS, isnt it?... and this is like the Virtual Machine Monitor, (the same as Xen), isnt it?


Virtual Iron is FULL virtualization too, but does it use a host or virtual machine monitor? or how is this?

I have used virtual iron, and it has a good frontend interface, you can install other OS, create disk, add/remove cpu, memory,clone servers, clone hard disk. But what is the host OS here? I read in wikip that virtual iron is XEN based but with full virtualization.

Do XEN and KVM does any frontend where you can create, remove, clone hard disk/servers. and so on?


With Virtual Iron you can have for example 3 physical server: node 0,1 and 2. for example if you have one linux running DNS server on node1 and it node files, the virtual iron move the DNS server to other node without affecting service.

Or if you have to change something on node1 , you can drag the Linux DNS server to node 0 or 2, and when finish drag again and thats it...

You can have VLANs, and use DMZ as you want.

Can ALL this be done with Xen or KVM ?


Thank you and sorry for my english, I hope you can understand what I mean.





Who has used virtual iron?
 
Old 06-02-2010, 05:57 PM   #2
HasC
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KVM and Xen use "hardware-assisted" virtualization, not "full". And Xen can do "para-virtualization" too.

Perhaps you should read a little bit more first.
 
Old 06-03-2010, 02:41 AM   #3
paulsm4
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Hi -

You're essentially correct.

"Virtualization" is a very, very big topic.

In addition to Xen and KVM, I would encourage you to also look at VMWare, Virtual Box ... and yes, even Microsoft technologies (including Virtual PC and Hyper-V).

IMHO .. PSM
 
Old 06-03-2010, 07:49 AM   #4
dyasny
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Quote:
Originally Posted by michaelux View Post

Does XEN can be used as FULL virtualization like kvm?
yes

Quote:
KVM is FULL virtualization, and it use a host OS, isnt it?... and this is like the Virtual Machine Monitor, (the same as Xen), isnt it?
KVM is a kernel module, which turns a basic linux kernel into a hypervisor

Quote:
Do XEN and KVM does any frontend where you can create, remove, clone hard disk/servers. and so on?
there's citrix xenserver for xen, and RHEV, for KVM

Also, there are products like libvirt, which supports both, proxmox, convirt etc.

Quote:
Or if you have to change something on node1 , you can drag the Linux DNS server to node 0 or 2, and when finish drag again and thats it...
It's called live migration. Both KVM and Xen can do that.

Quote:
You can have VLANs, and use DMZ as you want.
possible with RHEV, never tried it with Xen
 
Old 06-03-2010, 03:48 PM   #5
michaelux
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Thanks for the answer, I have now everything more clear. Right now I am installing kvm in Centos..after some problems finally I am installing the guest.


I will use this and learn all I can.


I have other doubt, the host OS is runing Centos, but as many other distros, It has many packages for example, httpd, tomcat, dns, and so on... of course I can remove these.. but is there a kind of distro only for be used for HOST OS, something light, and then you can run other guest over it... or that doesnt afect the performance?
 
Old 06-03-2010, 05:05 PM   #6
paulsm4
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The easiest approach is simply turn off the services you don't need or want.

For Centos, you should be able to do most of this with "chkconfig":

http://www.centos.org/docs/4/html/rh...chkconfig.html
 
Old 06-03-2010, 05:34 PM   #7
michaelux
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Quote:
Originally Posted by paulsm4 View Post
The easiest approach is simply turn off the services you don't need or want.

For Centos, you should be able to do most of this with "chkconfig":

http://www.centos.org/docs/4/html/rh...chkconfig.html
That is what I was thinking, disable what we dont need. But I just was wondering if there wasnt any light distribution for that.. sometime like asterisknow, tribox, and so on...and maybe even the kernel doesnt modules we dont need.

Thanks.
 
Old 06-08-2010, 06:54 AM   #8
dyasny
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There is a lightweight hypervisor distro:
oVirt node
and RHEV-H
 
  


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