docker-cirros-builder is a docker container that ships everything needed to build (and customize) x86-64-cirros images.
You can find the home of cirros here.
The current container uses
- cirros 0.3.3
- buildroot 2015.2
- uClib 0.33.2
- busybox 1.23.1
- gcc 4.8.4
and offers some convenience scripts:
- cirros-build - build cirros firmware
- cirros-build-image - build cirros images
- cirros-config-image - config buildroot environment
- cirros-config-image-busybox - configure busybox used within cirros
NOTE: The first run of 'cirros-build-image' triggers the download of a grub package.
To make the generated images easily available on the host machine you may start the instance with a shared directory attached (see example below).
NOTE: This container must be run in privileged mode since it uses loop-mounts.
Create the container on your own:
host> docker build -t cirros_x86_64_builder .
...
< this will take some time (for me ... ~15 min) >
...
Or just take the published one from docker hub:
host> docker pull hecke/cirros_x86_64_builder
Start the instance:
host> docker run --privileged -i -v /tmp/cirros_img/:/root/build/cirros-0.3.3/output/x86_64/images/ -t hecke/cirros_x86_64_builder
Inside the container:
root@667d9cbe3a20:~/build/cirros-0.3.3# cirros-build-image
...
wrote /root/build/cirros-0.3.3/output/x86_64/images/part.img
wrote /root/build/cirros-0.3.3/output/x86_64/images/disk.img
wrote /root/build/cirros-0.3.3/output/x86_64/images/kernel
wrote /root/build/cirros-0.3.3/output/x86_64/images/initramfs
wrote /root/build/cirros-0.3.3/output/x86_64/images/blank.img
wrote /root/build/cirros-0.3.3/output/x86_64/images/filesys.tar.gz
...
NOTE: The format of 'disk.img' is qcow2.
Just start the instance:
host> sudo qemu-system-x86_64 -curses /tmp/cirros_img/disk.img
Create a VM using the cirros image:
host> virt-install \
--connect qemu:https:///system \
--virt-type qemu \
--arch x86_64 \
--name cirros \
--ram 64 \
--disk path=/tmp/cirros_img/disk.img,format=qcow2 \
--boot hd \
--vnc \
--network network=default,mac=52:54:00:9c:42:23 \
--os-type linux