Custom BurmillaOS ISO #

It’s easy to build your own BurmillaOS ISO.

Create a clone of the main BurmillaOS repository to your local machine with a git clone.

$ git clone https://github.com/burmilla/os.git

In the root of the repository, the “General Configuration” section of Dockerfile.dapper can be updated to use custom kernels. After you’ve saved your edits, run make in the root directory. After the build has completed, a ./dist/artifacts directory will be created with the custom built BurmillaOS release files. Build Requirements: bash, make, docker (Docker version >= 1.10.3)

$ make
$ cd dist/artifacts
$ ls
initrd             burmillaos.iso
iso-checksums.txt  vmlinuz

If you need a compressed ISO, you can run this command:

$ make release

The burmillaos.iso is ready to be used to boot BurmillaOS from ISO or launch BurmillaOS using Docker Machine.

Creating a GCE Image Archive #

Create a clone of the main BurmillaOS repository to your local machine with a git clone.

$ git clone https://github.com/burmilla/os-packer.git

GCE supports KVM virtualization, and we use packer to build KVM images. Before building, you need to verify that the host can support KVM. If you want to build GCE image based on BurmillaOS v1.4.0, you can run this command:

BURMILLAOS_VERSION=v1.4.0 make build-gce

Custom Build Cases #

Reduce Memory Requirements #

With changes to the kernel and built Docker, BurmillaOS booting requires more memory. For details, please refer to the memory requirements.

By customizing the ISO, you can reduce the memory usage on boot. The easiest way is to downgrade the built-in Docker version, because Docker takes up a lot of space. This can effectively reduce the memory required to decompress the initrd on boot. Using docker 17.03 is a good choice:

# run make
$ USER_DOCKER_VERSION=17.03.2 make release

Building with a Different Console #

Available as of RancherOS v1.5.0

When building BurmillaOS, you have the ability to automatically start in a supported console instead of booting into the default console and switching to your desired one.

Here is an example of building BurmillaOS and having the alpine console enabled:

$ OS_CONSOLE=alpine make release

Building with Predefined Docker Images #

If you want to use a custom ISO file to address an offline scenario, you can use predefined images for system-docker and user-docker.

BurmillaOS supports APPEND_SYSTEM_IMAGES. It can save images to the initrd file, and is loaded with system-docker when booting.

You can build the ISO like this:

APPEND_SYSTEM_IMAGES="burmilla/os-openvmtools:10.3.10-1" make release

BurmillaOS also supports APPEND_USER_IMAGES. It can save images to the initrd file, and is loaded with user-docker when booting.

You can build the ISO like this:

APPEND_USER_IMAGES="alpine:3.9 ubuntu:bionic" make release

Please note that these will be packaged into the initrd, and the predefined images will affect the resource footprint at startup.