Fedora 20: build a VM with virt-builder

Here are trial and error logs when building VMs for KVM by using virt-builder

reference

http://libguestfs.org/virt-builder.1.html

[root@f20 ~]# cat /etc/fedora-release Fedora release 20 (Heisenbug) [root@f20 ~]# uname -ri 3.13.0-0.rc8.git2.1.vanilla.mainline.knurd.1.fc20.x86_64 x86_64 [root@f20 ~]# qemu-system-x86_64 --version QEMU emulator version 1.7.0, Copyright (c) 2003-2008 Fabrice Bellard

virt-builder includes libguest-tools.

# yum install libguestfs-tools # libguestfs-test-tool --version libguestfs-test-tool 1.24.4fedora=20,release=1.fc20,libvirt

list OSes you can build

# virt-builder --list virt-builder: warning: cache /root/.cache/virt-builder: Unix.Unix_error(20, "mkdir", "/root/.cache/virt-builder") virt-builder: disabling the cache centos-6                 CentOS 6.5 cirros-0.3.1             CirrOS 0.3.1 debian-6                 Debian 6 (Squeeze) debian-7                 Debian 7 (Wheezy) fedora-18                Fedora® 18 fedora-19                Fedora® 19 fedora-20                Fedora® 20 scientificlinux-6        Scientific Linux 6.4 ubuntu-10.04             Ubuntu 10.04 (Lucid) ubuntu-12.04             Ubuntu 12.04 (Precise) ubuntu-13.10             Ubuntu 13.10 (Saucy)

build a Fedora20 VM

error.

# virt-builder fedora-20 --root-password file:./rootpw.txt -o f20-vm.qcow2 --format qcow2 --size 20G --hostname f20-vm.example.com --install "@core" --firstboot-command 'yum update -y' --firstboot-command 'localectl set-locale LANG=ja_JP.utf8' --firstboot-command 'set-keymap jp' virt-builder: warning: cache /root/.cache/virt-builder: Unix.Unix_error(20, "mkdir", "/root/.cache/virt-builder") virt-builder: disabling the cache [   1.0] Downloading: http://libguestfs.org/download/builder/fedora-20.xz #######################################################################  100.0% [ 510.0] Planning how to build this image [ 510.0] Uncompressing [ 521.0] Resizing (using virt-resize) to expand the disk to 20.0G Fatal error: exception Guestfs.Error("could not create appliance through libvirt. Try running qemu directly without libvirt using this environment variable: export LIBGUESTFS_BACKEND=direct Original error from libvirt: 内部エラー: モニターに接続中にプロセス

Configure LIBGUESTFS_BACKEND environment.

# export LIBGUESTFS_BACKEND=direct # echo $LIBGUESTFS_BACKEND direct

okay.

# virt-builder fedora-20 --root-password file:./rootpw.txt -o f20-vm.qcow2 --format qcow2 --size 20G --hostname f20-vm.example.com --install "@core" --firstboot-command 'yum update -y' --firstboot-command 'localectl set-locale LANG=ja_JP.utf8' --firstboot-command 'set-keymap jp' virt-builder: warning: cache /root/.cache/virt-builder: Unix.Unix_error(20, "mkdir", "/root/.cache/virt-builder") virt-builder: disabling the cache [   1.0] Downloading: http://libguestfs.org/download/builder/fedora-20.xz #######################################################################  100.0% [ 518.0] Planning how to build this image [ 518.0] Uncompressing [ 529.0] Resizing (using virt-resize) to expand the disk to 20.0G [ 561.0] Opening the new disk [ 565.0] Setting a random seed [ 565.0] Setting the hostname: f20-vm.example.com [ 565.0] Setting root password [ 565.0] Installing packages: @core [ 624.0] Installing firstboot command: [1] yum update -y [ 624.0] Installing firstboot command: [2] localectl set-locale LANG=ja_JP.utf8 [ 624.0] Installing firstboot command: [3] set-keymap jp [ 624.0] Finishing off Output: f20-vm.qcow2 Output size: 20.0G Output format: qcow2 Total usable space: 19.0G Free space: 18.1G (95%)

the VM image has been created under the directory where you issued virt-builder command.

# file f20-vm.qcow2 f20-vm.qcow2: QEMU QCOW Image (unknown version)

copy the original VM image to KVM pool ( in my case, /var/lib/libvit/images/disk1 )

# cp f20-vm.qcow2 /var/lib/libvirt/images/disk1/f20.qcow2

deploy the VM.

# yum install virt-install # virt-install --import --name f20-vm1 --ram 512 --disk path=/var/lib/libvirt/images/disk1/f20-vm1.qcow2,format=qcow2,device=disk,bus=virtio,20G ERROR    Error with storage parameters: Size must be specified for non existent volume path '/var/lib/libvirt/images/disk1/f20-vm1.qcow2' [root@f20 Virtbuilder_works]# virt-install ERROR     [    0.000000] Initializing cgroup subsys cpuset [    0.000000] Initializing cgroup subsys cpu [    0.000000] Initializing cgroup subsys cpuacct [    0.000000] Linux version 3.11.10-301.fc20.x86_64 (mockbuild@bkernel01.phx2.fedoraproject.org) (gcc version 4.8.2 20131017 (Red Hat 4.8.2-1) (GCC) ) #1 SMP Thu Dec 5 14:01:17 UTC 2013 [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.11.10-301.fc2

when booting the VM for the  first time, execute “yum update” automatically.

[  112.857596] firstboot.sh[408]: Transaction test succeeded [  112.859440] firstboot.sh[408]: Running transaction [  114.431092] firstboot.sh[408]: Updating   : libselinux-2.2.1-6.fc20.x86_64                             1/129 [  115.127248] firstboot.sh[408]: Updating   : nspr-4.10.2-1.fc20.x86_64                                  2/129 [  115.797586] firstboot.sh[408]: Updating   : nss-util-3.15.3-1.fc20.x86_64                              3/129 [  116.429433] firstboot.sh[408]: Updating   : audit-libs-2.3.3-1.fc20.x86_64                             4/129