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Xen

Xen. Juan Ortega. Virtualization?. Virtual Machine vs Hypervisor. Desktop virtualization. Hypervisor. Types of Virtualization. Full Virtualization Runs unmodified OS “hosts” as a userspace program to emulate the machine. Some like QEMU can simulate different processors.

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Xen

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  1. Xen Juan Ortega

  2. Virtualization?

  3. Virtual Machine vs Hypervisor Desktop virtualization Hypervisor

  4. Types of Virtualization Full Virtualization Runs unmodified OS “hosts” as a userspace program to emulate the machine. Some like QEMU can simulate different processors. OS-level Virtualization Emulates a complete OS userspace using operating system facilities. http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails-build.htmlv Paravirtualization Relies on modified operating system kernels to work with the hypervisor.

  5. Hosts-Supported Systemsdom0 Guests-Supported Systems domU • Minix • Plan 9 • NetBSD • OpenBSD • FreeBSD (experimental) • OpenSolaris • NetWare • GNU Hurd • OZONE (old) • Linux 3.0 + • Novell’s SUSE Linux • Red Hat Enterprise Linux 5 (RHEL5) • Fedora • Ubuntu (partial) • Debian • Gentoo • Arch Linux • openSUSE • OpenSolaris • OpenBSD? • NetBSD • Linux 3.0 + Unmodified Guest OS using Hardware virtualization (HVM) Allows Guest OSs like Windows to run in “bare metal”. Vt-X and SVM

  6. Getting started $ xm list Name ID Mem VCPU State Time(s) Domain-0 0 934 2 r----- 37.6 -------------------------------------------------------------- $ cat /etc/xen/config_example name = “guest name” kernel = /boot/vmlinuz-2.6-xen.gz maxmem = 256 memory = 256 vcpus = 1 vfb = [ ] disk = [“tap:aio:/opt/xen/images/disk.img,xvda,w”] vif = [“mac=00:16:3e:63:b7:a0, bridge=xenbr0”] --------------------------------------------------------------------------- $ cm create –c /etc/xen/config_example

  7. Storage File as a block device. $ dd if=/dev/zero of=/opt/xen/drive_disk.imgbs=10M count=1024 $ xm block-attack 0 tap:aio:/opt/xen/drive_disk.img /dev/xvda1 w 0 $ mkfs.ext4 /dev/xvda1 $ mount /dev/xvda1 /mnt/ $ cp –a /opt/xen/images/centos-<version>/* /mnt/ disk = [‘tap:aio:/opt/xen/drive_disk.img’] $ xm create –c dive_disk LVMas device-independent physical devices. $ lsmod or $ modprobedm_mod $ pvcreate /dev/sdb1 $ vgcreatedisk_drive /dev/sdb1 $ lvcreate –L <disk size> -nNamedisk_drive $ mount /dev/disk_drive/Name /mnt/hd Disk = [‘phy:/dev/disk_drive/None,sdb1,w’]

  8. Network Each VM can have up to 8 interfaces. vif = [‘’, ‘’, ‘’] vif = [‘ip=“10.0.0.1”,mac=“ae:00:01:02:03:04”’] xm network-attach script=network bridge bridge=xenbr0

  9. Management vlrt-manager

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