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If the size is not specified, then one of two things happens.
If the output is a file, then the size is the same as the template.
You can change the output filename using the -o option: Create a Fedora 25 image. The default is to delete the output file if virt-builder fails (or, for example, some script that it runs fails).
The root password is taken from the file /tmp/rootpw. There are many options that let you customize the installation. Check that the index and templates are signed by the key with the given fingerprint.
will list out the operating systems available to install.
A selection of freely redistributable OSes is available as standard. After choosing a guest from the list, you may want to see if there are any installation notes: will build a Fedora 25 image for the same architecture as virt-builder (so running it from an i686 installation will try to build an i686 image, if available).
Note if you don’t set --root-password then the guest is given a random root password which is printed on stdout. These include: --run/--run-command, which run a shell script or command while the disk image is being generated and lets you add or edit files that go into the disk image. For example: During the customization phase, the given disk is attached to the libguestfs appliance. If the output of the program is redirected to a file, ANSI colour sequences are disabled unless you use this option. (The fingerprint is a long string, usually written as 10 groups of 4 hexadecimal digits). If you have multiple source URLs, then you can have either no fingerprint, one fingerprint or multiple fingerprints.
--firstboot/--firstboot-command, which let you add scripts/commands that are run the first time the guest boots. This is used to provide extra software repositories or other data for customization. Also this doesn't cache packages (the --install, --update options). If you have multiple, then each must correspond 1-1 with a source URL. To create an old-style qcow2 file (for compatibility with RHEL 6 or very old qemu (in fact it works for any VM disk image, not just ones built using virt-builder).
Please take a look at "FIRST BOOT SCRIPTS" for more information and caveats about the first boot scripts. Run command (and arguments) inside the guest when the guest first boots up (as root, late in the boot process). They run in the same order that they appear on the command line.This approach is used because it is much faster, but if you need to do fresh installs you may want to look at virt-install(1) and oz-install(1).The easiest way to get started is by looking at the examples in the next section.Therefore these would not work correctly if you immediately started the guest after running virt-builder - they would not see the complete output file.(Note that you should not use these caching modes - they are fundamentally broken for this and other reasons.) If you are not using these broken caching modes, you can use --no-sync to avoid this unnecessary sync and gain considerable extra performance. Virt-builder will resize filesystems inside the disk image automatically.
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key in the main object represents the "compatibility version", and it is bumped every time the resulting JSON output is incompatible with the previous versions (for example the structure has changed, or non-optional keys are no more present). The network only allows outgoing connections and has other minor limitations. If you use --no-network then certain other options such as --install will not work.