KVM over LVM

/en/linux/snippets/ kvmlvmpartedvirsh
20/December/2019
authorRentaro
Rentaro

Without further explanation

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parted -a optimal /dev/sda
unit MiB
print free

#    Number  Start     End        Size       Type     File system     Flags
#            0,03MiB   1,00MiB    0,97MiB             Free Space
#     1      1,00MiB   1025MiB    1024MiB    primary  ext4            boot
#     2      1025MiB   5121MiB    4096MiB    primary  linux-swap(v1)
#     3      5121MiB   70657MiB   65536MiB   primary  ext4
#            70657MiB  476940MiB  406283MiB           Free Space

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mkpart extended 70657 476940
align-check optimal 4
mkpart logical 70658 136194
align-check optimal 5
mkpart logical 136195 476940
align-check optimal 6
set 4 lba off
set 5 lvm on
print

#    Number  Start      End        Size       Type      File system     Flags
#     1      1,00MiB    1025MiB    1024MiB    primary   ext4            boot
#     2      1025MiB    5121MiB    4096MiB    primary   linux-swap(v1)
#     3      5121MiB    70657MiB   65536MiB   primary   ext4
#     4      70657MiB   476940MiB  406283MiB  extended
#     5      70658MiB   136194MiB  65536MiB   logical                   lvm
#     6      136195MiB  476940MiB  340745MiB  logical

fdisk -l /dev/sda

#    Device     Boot     Start       End   Sectors   Size Id Type
#    /dev/sda1  *         2048   2099199   2097152     1G 83 Linux
#    /dev/sda2         2099200  10487807   8388608     4G 82 Linux swap / Solaris
#    /dev/sda3        10487808 144705535 134217728    64G 83 Linux
#    /dev/sda4       144705536 976773119 832067584 396,8G  5 Extended
#    /dev/sda5       144707584 278925311 134217728    64G 8e Linux LVM
#    /dev/sda6       278927360 976773119 697845760 332,8G 83 Linux

LVM

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pvcreate /dev/sda5
vgcreate vg /dev/sda5
vgdisplay
vgscan
vgchange -a y
lvcreate --size 4G -n vmname vg

KVM

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virt-install
    --virt-type=kvm \
    --name=vmname \
    --ram=512 \
    --vcpus=4 \
    --os-type linux \
    --os-variant generic \
    --virt-type=kvm \
    --hvm \
    --cdrom=/data/debian-9.3.0-amd64-netinst.iso \
    --network=bridge=kvmbr0,model=e1000 \
    --graphics vnc,listen=10.10.10.10 \
    --disk path=/dev/mapper/vg-vmname

VM fstab

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# rootfs
UUID=<uuid>    /    ext4    discard,noatime,nodiratime,errors=remount-ro    0    1