kvm examples

kvm.txt

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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)
+