138 lines
2.4 KiB
Text
138 lines
2.4 KiB
Text
= Guest Disk Resize SOP
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Resize disks in our kvm guests
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== Contents
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* <<_contact_information>>
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* <<_how_to_do_it>>
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** <<_kvmlibvirt_guests>>
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== Contact Information
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Owner:::
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Fedora Infrastructure Team
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Contact:::
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#fedora-admin, sysadmin-main
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Location:::
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PHX, Tummy, ibiblio, Telia, OSUOSL
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Servers:::
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All xen servers, kvm/libvirt servers.
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Purpose:::
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Resize guest disks
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== How to do it
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=== KVM/libvirt Guests
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[arabic]
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. SSH to the kvm server and resize the guest's logical volume. If you
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want to be extra careful, make a snapshot of the LV first:
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+
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....
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lvcreate -n [guest name]-snap -L 10G -s /dev/VolGroup00/[guest name]
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....
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+
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Optional, but always good to be careful
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. Shutdown the guest:
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+
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....
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sudo virsh shutdown [guest name]
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....
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. Disable the guests lv:
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+
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....
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lvchange -an /dev/VolGroup00/[guest name]
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....
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. Resize the lv:
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+
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....
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lvresize -L [NEW TOTAL SIZE]G /dev/VolGroup00/[guest name]
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or
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lvresize -L +XG /dev/VolGroup00/[guest name]
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(to add X GB to the disk)
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....
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. Enable the lv:
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+
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....
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lvchange -ay /dev/VolGroup00/[guest name]
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....
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. Bring the guest back up:
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+
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....
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sudo virsh start [guest name]
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....
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. Login into the guest:
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+
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....
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sudo virsh console [guest name]
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You may wish to boot single user mode to avoid services coming up and going down again
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....
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. On the guest, run:
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+
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....
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fdisk /dev/vda
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....
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. Delete the the LVM partition on the guest you want to add space to and
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recreate it with the maximum size. Make sure to set its type to LV (8e):
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+
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....
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p to list partitions
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d to delete selected partition
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n to create new partition (default values should be ok)
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t to change partition type (set to 8e)
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w to write changes
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....
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. Run partprobe:
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+
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....
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partprobe
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....
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. Check the size of the partition:
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+
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....
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fdisk -l /dev/vdaN
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....
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If this still reflects the old size, then reboot the guest and verify
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that its size changed correctly when it comes up again.
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. Login to the guest again, and run:
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+
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....
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pvresize /dev/vdaN
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....
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. A vgs should now show the new size. Use lvresize to resize the root
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lv:
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+
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....
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lvresize -L [new root partition size]G /dev/GuestVolGroup00/root
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(pvs will tell you how much space is available)
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....
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. Finally, resize the root partition:
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+
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....
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resize2fs /dev/GuestVolGroup00/root
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(If the root fs is ext4)
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or
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xfs_growfs /dev/GuestVolGroup00/root
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(if the root fs is xfs)
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....
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+
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verify that everything worked out, and delete the snapshot you made if
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you made one.
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