presentation
Upcoming SlideShare
Loading in...5
×
 

Like this? Share it with your network

Share

presentation

on

  • 576 views

 

Statistics

Views

Total Views
576
Views on SlideShare
575
Embed Views
1

Actions

Likes
0
Downloads
9
Comments
0

1 Embed 1

http://www.slideshare.net 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

presentation Presentation Transcript

  • 1. Xen Virtualization Andrew Hamilton TJHSST CSL Logo and Powered By Linux by Dan Tran tjhsst.edu/~dtran
  • 2. Presentation Overview
    • Theory
    • Methods of Virtualizing
    • Xen Virtualization
    • Conclusion
  • 3. Theory
    • Do one thing and do it well (The UNIX philosophy)
    • Containerize Systems
    • Many little machines contained in one
  • 4. Methods of Virtualization
    • Chroots
      • Minimal Overhead
      • One kernel, network connection, process system
      • Root can break out
    • FreeBSD Jails / Solaris Containers
      • Separate Networking and process systems, root is trapped
      • Overhead is still minimal
      • Still only one kernel
  • 5. More Methods of Virtualization
    • Full Virtualization
      • Multiple OSes, complete segregation of resources
      • High overhead, oftentimes expensive
    • Paravirtualization (Xen/LDOMs)
      • Multiple Oses with less overhead
      • May require specialized hardware or a modified operating system
  • 6. Xen Virtualization
  • 7. What we have
    • Hypervisor
      • Runs underneath everything and serves as an interface between the hardware and the VMs
      • The Xen part of Xen Virtualization
    • Dom0
      • Generally a linux kernel with the xen patches
      • Is able to control the hypervisor and manage VMs
      • Needs drivers for the server hardware
    • DomUs
      • The VMs we want to run
  • 8. Installing a Dom0
    • First install and configure the linux distribution of your choice
    • Then install the xen-specific packages
      • Debian: apt-get install xen-linux-image
      • Gentoo: emerge xen, xen-tools, xen-sources
      • Red Hat: yum install xen kernel-xen
  • 9. Configuring the Dom0
    • Grub
      • Boot using the Xen hypervisor as the kernel
      • Load the Dom0 Kernel as a Module
      • Start xend on boot
    • VM Storage Space
      • Local vs SAN
      • Files or LVM (or other devices)
    • Setup VM Networking
      • Bridging or NAT
  • 10. VM Networking: Bridging Switch eth0 xenbr0 Vif0.0 Vif1.0 Vif2.0 Network Bridge Physical Adapter Network VMs
  • 11. VM Networking: NAT Switch eth0 IPTables Vif0.0 Vif1.0 Vif2.0 NAT/Firewall Physical Adapter Network VMs
  • 12. Testing Time!
    • Reboot to the Xen Setup (hopefully it boots)
    • Stress Test the new setup
      • Recompiling the kernel repeated works well
      • For a in `seq 1 20`; do make clean; make; done;
    • Make sure everything works well now
    • If it doesn’t fix it now
  • 13. Creating VMs
    • Manual or automatic?
      • Xen-tools
    • File-based vs Device-based
    • Create the harddrives
      • LVM create the logical volumes
      • Files, create the files
    • Format the disks
  • 14. Linux VMs
    • Mount the hard-drives
    • Use an appropriate method to install your OS
      • Debootstrap
      • Untar and chroot
      • Copy over an image
    • Remember VMs only need a small set of packages
  • 15. Xen Config Files
    • kernel = ‘/boot/kernel-2.6.29-r1-amd64-xen-domu
    • Initrd (if required)
    • Memory = ‘512’
    • Disk = [ ‘phy:vgmagellanic/ns1-disk,sda1,w’ file:/home/xen/ns1-swap,sda2,w’ ]
    • Name = ‘ns1’
    • vif = [ 'mac=00:02:C6:26:10:B7‘, ‘mac=00:16:3e:aa:bb:cc,bridge=xenbr1’ ]
  • 16. Managing VMs
    • Starting VMs (xm create)
      • We usually want to be running VMs
    • Stopping VMs (xm shutdown)
      • This is the nice safe way to stop VMs
    • Really Stopping VMs (xm destroy)
      • The Xen equivalent of a four-second off
    • Monitoring (xm list, xm top)
  • 17. Advanced Features
    • Live Migration (xm migrate)
      • Enable in xend config
      • Both servers need to be able to access the VM’s disks
    • Snapshotting for backups
      • Using lvm to make consistent backups
      • Snapshot the domu from the dom0
      • Mount the snapshot and rsync or tar it
  • 18. Conclusion
    • Xen can provide a separation of services with minimal performance hit
    • It is NOT a guaranteed security measure, but it’s pretty good
    • Some programs dislike running in VMs
    • Allows Virtualization on older x86 hardware
  • 19.
    • http://tjhsst.edu/~ahamilto/josti09/
    • This Presentation
    • http://tjhsst.edu/admin/livedoc/
      • Sysadmin Livedoc, lots of general knowledge about Linux/UNIX
    • http://www.xen.org
      • Homepage of the Xen project.
    A Few Resources
  • 20. Any Questions?