ifconfig xenbr0 osinfo-query os | grep centos
using generic because arful does not exist yet into osinfo (Jan 2018),
virt-install \ --name artful \ --ram 512 \ --disk path=/data/kvm/artful.qcow2,size=8,bus=virtio \ --vcpus 2 \ --os-type linux \ --os-variant generic \ --network bridge=xenbr0,model=virtio \ --graphics none \ --accelerate \ --console pty,target_type=serial \ --location 'http://archive.ubuntu.com/ubuntu/dists/artful/main/installer-amd64/' \ --extra-args 'console=ttyS0,115200n8 serial'
you need to fix GRUB setup for talking to the serial console,
mkdir -p /tmp/kvmloop/ guestmount --help guestmount -d ubuntu17.10 -i /tmp/kvmloop #-w
grub-update
has troubles inside the image chroot,
grub-probe: error: unknown filesystem.
so fix grub like a dirty bastard,
cp -pi /tmp/kvmloop/boot/grub/grub.cfg /tmp/kvmloop/boot/grub/grub.cfg vi /tmp/kvmloop/boot/grub/grub.cfg (vmlinuz lines... after ro) console=ttyS0,19200 earlyprint=serial,ttyS0,115200 guestunmount /tmp/kvmloop
and eventually do it properly once the guest has booted,
cd /etc/default/ cp -pi grub grub.dist vi grub GRUB_CMDLINE_LINUX='console=tty0 console=ttyS0,115200n8' GRUB_TERMINAL=serial GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1" update-grub
refs.
either launch the installation with graphics,
virt-install \ --name netbsd \ --ram 128 \ --disk path=/data/kvm/netbsd.qcow2,size=2,bus=virtio \ --vcpus 1 \ --os-type generic \ --os-variant generic \ --network bridge=xenbr0,model=virtio \ --graphics vnc,port=5999 \ --console pty,target_type=serial \ --cdrom /data/ISO-IMAGES/NetBSD-7.1-amd64.iso
and define com0/115200 for boot blocks
or use the boot-com.iso
to start from serial console right away!
wget -O - http://ftp.fr.netbsd.org/pub/NetBSD/NetBSD-7.1.1/amd64/installation/cdrom/boot-com.iso > /data/guests/ISO-IMAGES/boot-com.iso wget -O - http://ftp.fr.netbsd.org/pub/NetBSD/NetBSD-7.1.1/amd64/installation/cdrom/SHA512 > /data/guests/ISO-IMAGES/SHA512.netbsd.bootcom virt-install \ --virt-type kvm \ --name netbsdserial \ --ram 128 \ --disk path=/data/kvm/netbsdserial.qcow2,size=2,bus=virtio \ --vcpus 1 \ --network bridge=xenbr0,model=virtio \ --graphics none \ --console pty,target_type=serial \ --accelerate \ --noautoconsole \ --cdrom /data/ISO-IMAGES/boot-com.iso \ --cpu host
during the installation, choose com0 and baud rate as for boot blocks, and you are good to continue with virsh console
already.
Note. the only drawback with the boot-com.iso
method is that you will have to provide another source than CDROM as for the installation sets (e.g. network through vioif0
). The command,
/sbin/mount -rt cd9660 /dev/cd0a /mnt2
does not work during the installation when using boot-com.iso
(83M instead of 374M for the full one).
refs.
draft
ubuntu-vm-builder kvm xenial --name guestbuilder --libvirt qemu:///system #--components 'main,universe,restricted' tail -F /tmp/tmpARZ01Y
refs.
apt install uvtool uvt-simplestreams-libvirt sync release=xenial arch=amd64 uvt-simplestreams-libvirt sync release=artful arch=amd64
it wants an RSA key pair, not ECDSA or what ever is much better, so let us give this crappy tool some slack,
ssh-keygen
and finally run a guest,
uvt-kvm create guestuvt uvt-kvm list virsh list
and access it,
uvt-kvm ssh guestuvt
refs.
Tuning KVM https://www.linux-kvm.org/page/Tuning_KVM
Tuning Kernel https://www.linux-kvm.org/page/Tuning_Kernel
Memory https://www.linux-kvm.org/page/Memory
Chapter 6. Overcommitting with KVM https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/virtualization_administration_guide/chap-virtualization-tips_and_tricks-overcommitting_with_kvm
Chapter 7. KSM https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/virtualization_administration_guide/chap-KSM
How to use the Kernel Samepage Merging feature https://www.kernel.org/doc/Documentation/vm/ksm.txt
KVM host won’t use memory for caching https://serverfault.com/questions/710172/kvm-host-wont-use-memory-for-caching
Virtualization (KVM) and excessive cached RAM https://unix.stackexchange.com/questions/241142/virtualization-kvm-and-excessive-cached-ram
Kernel same-page merging https://en.wikipedia.org/wiki/Kernel_same-page_merging