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authorChris Marusich <cmmarusich@gmail.com>2018-02-19 05:45:03 +0100
committerChris Marusich <cmmarusich@gmail.com>2018-03-24 03:04:11 +0100
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parent1c2ac6b482ea20419e57fd54b0cd1d4d3972776b (diff)
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system: Add "guix system docker-image" command.
* gnu/system/vm.scm (system-docker-image): New procedure. * guix/scripts/system.scm (system-derivation-for-action): Add a case for docker-image, and in that case, call system-docker-image. (show-help): Document docker-image. (guix-system): Parse arguments for docker-image. * doc/guix.texi (Invoking guix system): Document "guix system docker-image". * gnu/system/examples/docker-image.tmpl: New file.
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diff --git a/doc/guix.texi b/doc/guix.texi
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@@ -20385,12 +20385,18 @@ containing at least the kernel, initrd, and bootloader data files must
be created. The @code{--image-size} option can be used to specify the
size of the image.
+@cindex System images, creation in various formats
+@cindex Creating system images in various formats
@item vm-image
@itemx disk-image
-Return a virtual machine or disk image of the operating system declared
-in @var{file} that stands alone. By default, @command{guix system}
-estimates the size of the image needed to store the system, but you can
-use the @option{--image-size} option to specify a value.
+@itemx docker-image
+Return a virtual machine, disk image, or Docker image of the operating
+system declared in @var{file} that stands alone. By default,
+@command{guix system} estimates the size of the image needed to store
+the system, but you can use the @option{--image-size} option to specify
+a value. Docker images are built to contain exactly what they need, so
+the @option{--image-size} option is ignored in the case of
+@code{docker-image}.
You can specify the root file system type by using the
@option{--file-system-type} option. It defaults to @code{ext4}.
@@ -20408,6 +20414,28 @@ using the following command:
# dd if=$(guix system disk-image my-os.scm) of=/dev/sdc
@end example
+When using @code{docker-image}, a Docker image is produced. Guix builds
+the image from scratch, not from a pre-existing Docker base image. As a
+result, it contains @emph{exactly} what you define in the operating
+system configuration file. You can then load the image and launch a
+Docker container using commands like the following:
+
+@example
+image_id="$(docker load < guixsd-docker-image.tar.gz)"
+docker run -e GUIX_NEW_SYSTEM=/var/guix/profiles/system \\
+ --entrypoint /var/guix/profiles/system/profile/bin/guile \\
+ $image_id /var/guix/profiles/system/boot
+@end example
+
+This command starts a new Docker container from the specified image. It
+will boot the GuixSD system in the usual manner, which means it will
+start any services you have defined in the operating system
+configuration. Depending on what you run in the Docker container, it
+may be necessary to give the container additional permissions. For
+example, if you intend to build software using Guix inside of the Docker
+container, you may need to pass the @option{--privileged} option to
+@code{docker run}.
+
@item container
Return a script to run the operating system declared in @var{file}
within a container. Containers are a set of lightweight isolation