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kvm examples

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G.J.C. Strikwerda 2022-05-25 09:49:37 +02:00
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create image:
ger@ger-lpt-werk:~/vm$ qemu-img create -f qcow2 test-image.qcow2 25G
Formatting 'test-image.qcow2', fmt=qcow2 size=26843545600 cluster_size=65536 lazy_refcounts=off refcount_bits=16
ger@ger-lpt-werk:~/vm$ ls -ltr
total 196
-rw-r--r-- 1 ger ger 197008 apr 8 16:53 test-image.qcow2
download iso_image
create/start vm:
ger@ger-lpt-werk:~/vm$ qemu-system-x86_64 -cdrom ../iso/ubuntu-server.iso -cpu host -enable-kvm -m 2G -smp 2 -drive file=./test-image.qcow2,format=qcow2
start vm after install:
ger@ger-lpt-werk:~/vm$ qemu-system-x86_64 -cpu host -enable-kvm -m 2G -smp 2 -drive file=./test-image.qcow2,format=qcow2 -name vm01
create extra disk:
ger@ger-lpt-werk:~/vm$ qemu-img create -f qcow2 ./extra_disk.qcow2 5G
Formatting './extra_disk.qcow2', fmt=qcow2 size=5368709120 cluster_size=65536 lazy_refcounts=off refcount_bits=16
$ virsh attach-disk vm01 /home/ger/vm/extra_disk.qcow2 vdb --cache none
virsh run:
ger@ger-lpt-werk:~/vm$ virt-install --name=vm01 --ram=2048 --vcpus=2 --disk path=./test-image.qcow2 --boot=hd
WARNING No operating system detected, VM performance may suffer. Specify an OS with --os-variant for optimal results.
Starting install..
ger@ger-lpt-werk:~/vm$ virsh destroy vm01
Domain vm01 destroyed
ger@ger-lpt-werk:~/vm$ virsh start vm01
Domain vm01 started
ger@ger-lpt-werk:~/vm$ virsh list --all
Id Name State
----------------------
2 vm01 running
add disk via dd:
ger@ger-lpt-werk:~/vm$ dd if=/dev/zero of=./disk_dd.dsk count=5000 bs=1M
5000+0 records in
5000+0 records out
5242880000 bytes (5,2 GB, 4,9 GiB) copied, 6,34483 s, 826 MB/s
ger@ger-lpt-werk:~/vm$ du -sh ./disk_dd.dsk
4,9G ./disk_dd.dsk
ger@ger-lpt-werk:~/vm$ virsh attach-disk vm01 /home/ger/vm/disk_dd.dsk vdb --cache none
Disk attached successfully
persistent disk:
ger@ger-lpt-werk:~/vm$ virsh attach-disk vm01 /home/ger/vm/disk_dd.dsk vdb --persistent --cache none
Disk attached successfully
create extra disk ala rdms:
ger@ger-lpt-werk:~/vm$ qemu-img create -o preallocation=metadata -f qcow2 rdms-prod.qcow2 2G
Formatting 'rdms-prod.qcow2', fmt=qcow2 size=2147483648 cluster_size=65536 preallocation=metadata lazy_refcounts=off refcount_bits=16
ger@ger-lpt-werk:~/vm$ virsh attach-disk vm01 --target vdd --persistent --driver qemu --subdriver qcow2 --source /home/ger/vm/rdms-prod.qcow2
Disk attached successfully
root@irods01:/home/ger# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 25G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1.5G 0 part /boot
└─sda3 8:3 0 23.5G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 11.8G 0 lvm /
vda 252:0 0 4.9G 0 disk
vdb 252:16 0 2G 0 disk
[Wed Apr 13 07:24:06 2022] pci 0000:00:09.0: [1af4:1001] type 00 class 0x010000
[Wed Apr 13 07:24:06 2022] pci 0000:00:09.0: reg 0x10: [io 0x0000-0x007f]
[Wed Apr 13 07:24:06 2022] pci 0000:00:09.0: reg 0x14: [mem 0x00000000-0x00000fff]
[Wed Apr 13 07:24:06 2022] pci 0000:00:09.0: reg 0x20: [mem 0x00000000-0x00003fff 64bit pref]
[Wed Apr 13 07:24:06 2022] pci 0000:00:09.0: BAR 4: assigned [mem 0x100000000-0x100003fff 64bit pref]
[Wed Apr 13 07:24:06 2022] pci 0000:00:09.0: BAR 1: assigned [mem 0x80000000-0x80000fff]
[Wed Apr 13 07:24:06 2022] pci 0000:00:09.0: BAR 0: assigned [io 0x1000-0x107f]
[Wed Apr 13 07:24:06 2022] virtio-pci 0000:00:09.0: enabling device (0000 -> 0003)
[Wed Apr 13 07:24:06 2022] virtio_blk virtio3: [vdb] 4194304 512-byte logical blocks (2.15 GB/2.00 GiB)