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CentOS 5 Virtualization - Anyone used it ?

Discussion in 'General Discussion' started by bin_asc, Jun 18, 2007.

  1. bin_asc

    bin_asc Well-Known Member

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    I saw centos 5 has new features like virtualization. I would really love to use it. Has anyone tried it ? Has anyone a how-to or a reference how to get it working ?

    Regards,
    Adrian
     
  2. Glum

    Glum Registered

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    I have tried

    Hey, have tried to installed it on CentOS running on XEN. (dom0 is etch)
    couldnt get it to work because of amd64 arch.
     
  3. bin_asc

    bin_asc Well-Known Member

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    Ok, but I saw that on 32 bit it works, although on x86_64 virtualization has a max RAM limit.
     
  4. nwilkens

    nwilkens Well-Known Member

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    Centos5

    I have used it and deployed Windows 2k3, and many Linux virtual machines, full and paravirtualized.

    Some reference points..

    - I am partial to using LVM based devices for creating my virtual machines. Think lvm snapshots for backups.

    A setup I am working on now consists of 4 systems with a dedicated LVM device, and an lvm based mount point for file based VMs.

    # vgs
    VG #PV #LV #SN Attr VSize VFree
    xen1vg 1 6 0 wz--n- 1.96T 1.47T

    # lvs
    LV VG Attr LSize Origin Snap% Move Log Copy%
    vm1rootlv xen1vg -wi-a- 80.00G
    vm2rootlv xen1vg -wi-a- 80.00G
    vm3rootlv xen1vg -wi-a- 80.00G
    vm4rootlv xen1vg -wi-a- 80.00G
    xen_master_img-lv xen1vg -wi-a- 80.00G
    xenimages1lv xen1vg -wi-ao 100.00G

    - If you decide to use a file based VM, but use a directory other than /var/lib/xen/images to store your image files, then selinux will get in the way. Use the following:
    # semanage fcontext -a -t xen_image_t "/<new_directory>(/.*)?"
    # restorecon -R /<new_directory>/

    - If something is not working check /var/log/audit/audit.log and 'dmesg', disable selinux: 'setenforce 0'.

    - If your system is installing or using a file based cdrom device, and you need to insert or change to another disk:
    # xm block-list <vmname>
    Vdev BE handle state evt-ch ring-ref BE-path
    768 0 0 1 -1 -1 /local/domain/0/backend/vbd/14/768
    5632 0 0 1 -1 -1 /local/domain/0/backend/vbd/14/5632

    # xm block-detach <vmname> 5632 -f
    # xm block-attach <vmname> file:/xen-images/nextdisk.iso hdc:cdrom r
     
    #4 nwilkens, Jun 18, 2007
    Last edited: Jun 18, 2007
  5. bin_asc

    bin_asc Well-Known Member

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    Never used LVM before. Is it included with CentOS ?
     
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