Hidden gem of Fedora: virt-builder

Or I should say hidden gem of Fedora, CentOS and RHEL. This fantastic tool is part of package named libguestfs-tools-c and it’s fast image builder. To create Fedora 27 10GB image with root password set to “redhat”:

virt-builder fedora-27 --size=10G \
  --root-password password:redhat

To start the image use libvirt utility:

virt-install --import --name fedora --ram 2048 \
  --disk path=fedora-27.img,format=raw --os-variant fedora27

To start Fedora 25 and immediately install Xfce desktop:

virt-builder fedora-25 --install "@Xfce Desktop"

To build Debian Wheezy image, update it and inject your SSH key to root:

virt-builder debian-7 --update --ssh-inject root:~/.ssh/id_rsa.pub

To create CentOS 7.4 image on LVM volume with a hostname set:

virt-builder centos-7.4 --output /dev/vg_virt/centos \
  --root-password password:redhat --hostname centos.lan

To ___________________ (complete the sentence):

virt-builder fedora-25 \
   --hostname client.example.com \
   --update \
   --install puppet \
   --append-line '/etc/puppet/puppet.conf:[agent]' \
   --append-line '/etc/puppet/puppet.conf:server = puppetmaster.example.com/' \
   --run-command 'systemctl enable puppet' \
   --selinux-relabel

To list available images do:

[lzap@box ~]$ virt-builder -l
centos-6                 x86_64     CentOS 6.6
centos-7.0               x86_64     CentOS 7.0
centos-7.1               x86_64     CentOS 7.1
centos-7.2               aarch64    CentOS 7.2 (aarch64)
centos-7.2               x86_64     CentOS 7.2
centos-7.3               x86_64     CentOS 7.3
centos-7.4               x86_64     CentOS 7.4
cirros-0.3.1             x86_64     CirrOS 0.3.1
cirros-0.3.5             x86_64     CirrOS 0.3.5
debian-6                 x86_64     Debian 6 (Squeeze)
debian-7                 sparc64    Debian 7 (Wheezy) (sparc64)
debian-7                 x86_64     Debian 7 (wheezy)
debian-8                 x86_64     Debian 8 (jessie)
debian-9                 x86_64     Debian 9 (stretch)
fedora-18                x86_64     Fedora® 18
fedora-19                x86_64     Fedora® 19
fedora-20                x86_64     Fedora® 20
fedora-21                aarch64    Fedora® 21 Server (aarch64)
fedora-21                armv7l     Fedora® 21 Server (armv7l)
fedora-21                ppc64      Fedora® 21 Server (ppc64)
fedora-21                ppc64le    Fedora® 21 Server (ppc64le)
fedora-21                x86_64     Fedora® 21 Server
fedora-22                aarch64    Fedora® 22 Server (aarch64)
fedora-22                armv7l     Fedora® 22 Server (armv7l)
fedora-22                i686       Fedora® 22 Server (i686)
fedora-22                x86_64     Fedora® 22 Server
fedora-23                aarch64    Fedora® 23 Server (aarch64)
fedora-23                armv7l     Fedora® 23 Server (armv7l)
fedora-23                i686       Fedora® 23 Server (i686)
fedora-23                ppc64      Fedora® 23 Server (ppc64)
fedora-23                ppc64le    Fedora® 23 Server (ppc64le)
fedora-23                x86_64     Fedora® 23 Server
fedora-24                aarch64    Fedora® 24 Server (aarch64)
fedora-24                armv7l     Fedora® 24 Server (armv7l)
fedora-24                i686       Fedora® 24 Server (i686)
fedora-24                x86_64     Fedora® 24 Server
fedora-25                aarch64    Fedora® 25 Server (aarch64)
fedora-25                armv7l     Fedora® 25 Server (armv7l)
fedora-25                i686       Fedora® 25 Server (i686)
fedora-25                ppc64      Fedora® 25 Server (ppc64)
fedora-25                ppc64le    Fedora® 25 Server (ppc64le)
fedora-25                x86_64     Fedora® 25 Server
fedora-26                aarch64    Fedora® 26 Server (aarch64)
fedora-26                armv7l     Fedora® 26 Server (armv7l)
fedora-26                i686       Fedora® 26 Server (i686)
fedora-26                ppc64      Fedora® 26 Server (ppc64)
fedora-26                ppc64le    Fedora® 26 Server (ppc64le)
fedora-26                x86_64     Fedora® 26 Server
fedora-27                aarch64    Fedora® 27 Server (aarch64)
fedora-27                armv7l     Fedora® 27 Server (armv7l)
fedora-27                i686       Fedora® 27 Server (i686)
fedora-27                ppc64      Fedora® 27 Server (ppc64)
fedora-27                ppc64le    Fedora® 27 Server (ppc64le)
fedora-27                x86_64     Fedora® 27 Server
freebsd-11.1             x86_64     FreeBSD 11.1
scientificlinux-6        x86_64     Scientific Linux 6.5
ubuntu-10.04             x86_64     Ubuntu 10.04 (Lucid)
ubuntu-12.04             x86_64     Ubuntu 12.04 (Precise)
ubuntu-14.04             x86_64     Ubuntu 14.04 (Trusty)
ubuntu-16.04             x86_64     Ubuntu 16.04 (Xenial)
rhel-3.9                 x86_64     Red Hat Enterprise Linux 3.9
rhel-4.9                 x86_64     Red Hat Enterprise Linux 4.9
rhel-5.10                x86_64     Red Hat Enterprise Linux 5.10
rhel-5.11                x86_64     Red Hat Enterprise Linux 5.11
rhel-5.11                i686       Red Hat Enterprise Linux 5.11 (i686)
rhel-6.1                 x86_64     Red Hat Enterprise Linux 6.1
rhel-6.2                 x86_64     Red Hat Enterprise Linux 6.2
rhel-6.3                 x86_64     Red Hat Enterprise Linux 6.3
rhel-6.4                 x86_64     Red Hat Enterprise Linux 6.4
rhel-6.5                 x86_64     Red Hat Enterprise Linux 6.5
rhel-6.6                 x86_64     Red Hat Enterprise Linux 6.6
rhel-6.7                 x86_64     Red Hat Enterprise Linux 6.7
rhel-6.8                 x86_64     Red Hat Enterprise Linux 6.8
rhel-6.8                 i686       Red Hat Enterprise Linux 6.8 (i686)
rhel-7.0                 x86_64     Red Hat Enterprise Linux 7.0
rhel-7.1                 x86_64     Red Hat Enterprise Linux 7.1
rhel-7.1                 ppc64      Red Hat Enterprise Linux 7.1 (ppc64)
rhel-7.1                 ppc64le    Red Hat Enterprise Linux 7.1 (ppc64le)
rhel-7.2                 x86_64     Red Hat Enterprise Linux 7.2
rhel-7.2                 aarch64    Red Hat Enterprise Linux 7.2 for aarch64
rhel-7.2                 ppc64le    Red Hat Enterprise Linux 7.2 (ppc64le)
rhel-7.3                 x86_64     Red Hat Enterprise Linux 7.3
rhel-7.3                 aarch64    Red Hat Enterprise Linux 7.3 for aarch64
rhel-7.3                 ppc64      Red Hat Enterprise Linux 7.3 (ppc64)
rhel-7.3                 ppc64le    Red Hat Enterprise Linux 7.3 (ppc64le)
rhel-7.4                 x86_64     Red Hat Enterprise Linux 7.4
rhel-7.4                 aarch64    Red Hat Enterprise Linux 7.4 for aarch64
rhel-7.4                 ppc64      Red Hat Enterprise Linux 7.4 (ppc64)
rhel-7.4                 ppc64le    Red Hat Enterprise Linux 7.4 (ppc64le)

Keep in mind that RHEL systems are only available to redhatters, a repository must be configured via /etc/virt-builder/repos.d/rhel.conf file to have them. Search the intranet.

This post barely scratched the surface. This utility can do more. Much more.

Send beer, t-shirts and flowers to Richard W.M. Jones and his team of contributors and maintainers. Thanks folks!

06 February 2018 | linux | fedora | rhel | centos
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