Container-Optimized OS is based on, and built using, tools from the open-source Chromium OS project. If you like, you can build a Container-Optimized OS image yourself directly from the Chromium source code.
To build a Container-Optimized OS image, you'll need to install the following tools on your development machine:
- A package of Chromium scripts called
Obtaining the Container-Optimized OS source code
You can download the source code for Container-Optimized OS using
First, create a directory to store the source code, and then download it using
the following commands:
repo init -u https://chromium.googlesource.com/chromiumos/manifest.git --repo-url https://chromium.googlesource.com/external/repo.git repo sync
Building a Container-Optimized OS image
To build any Chromium OS project, you must create a suitable
environment. You can use the
cros_sdk tool included in
depot_tools to create
and enter a
chroot that's ready for Chromium OS compilation by running the
chroot, you can build the image. Building any Chromium OS project
produces a disk image, which can be customized for different machines (called
"boards"). To build Container-Optimized OS, specify
lakitu for the board
name as follows:
(cr) ~/trunk/src/scripts $ ./build_packages --board=lakitu (cr) ~/trunk/src/scripts $ ./build_image --board=lakitu [base|dev|test]
You can build either a
test image by passing the
appropriate parameter to the
./build image script command. If you don't
specify a parameter, the
dev image is built by default.
dev image contains some additional debug tools installed on top of the
base image. The
test image includes the debug tools from the
dev image as
well as tools necessary for running automatic Chromimum OS tests.
Running Your Image
Once you've built your Container-Optimized OS image, you can run the image using KVM, or import the image to a Compute Engine instance.
Running in KVM
To boot your image in KVM, run the following command:
~/cos $ kvm -m 1024 -nographic -net nic,model=virtio -net user,hostfwd=tcp:127.0.0.1:9222-:22 -hda src/build/images/lakitu/latest/chromiumos_test_image.bin
Booting in this manner leaves the VM's serial port connected to your console,
letting you log in without using SSH. If you're running a
test image, you can
log in with the username/password pair "root/test0000".
Once the VM is started, you can access your
test image using SSH. To
SSH into the image, use the key generated for that image, as follows:
~/cos $ ssh root@localhost -p 9222 -i src/build/images/lakitu/latest/id_rsa
Running on Compute Engine
To import your image to a Compute Engine instance, you must compress the image
.tar file. To compress the image, run the following command:
~/cos $ tar -Sczf compressed-image.tar.gz images/lakitu/latest/chromiumos_image.bin --transform 's|images/lakitu/latest/chromiumos_image.bin|disk.raw|'
After you've created your
.tar file, you can follow the instructions to
import an existing image in the Compute Engine documentation.