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tavisrudd / gentoo-cloud-image-builder

Create gentoo openstack-compatible images

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Intro

Create gentoo openstack-compatible images

Use

gentoo-cloud-image-builder is meant to be run from a qemu compatible host. The high-level process includes booting a vm (using qemu) to the gentoo install cd/environment and subsequently automating a complete install.

In order to build an image you simply need to clone the repo and ensure you have a few standard deps on your host machine including:

  • qemu / kvm
  • curl
  • mkisofs
  • internet connectivity (all required files are downloaded for you)

On the host:

./launch.sh -t build

# give yourself a bigger console
vga=791

On the vm after booting the gentoo installer:

# optionally launch screen or tmux

mkdir -p /mnt/builder
mount /dev/disk/by-label/builder /mnt/builder
/mnt/builder/full_install.sh

At this point kick back and relax. Your image will be ready shortly. Once everything is done you can halt the vm and test it out by running:

# start the new image (any changes made to the live os will not persist in the image)
# login with gentoo:gentoo (note these creds are *NOT* baked into the image)
./launch.sh -t test

# on another terminal
tail -f log/console.log

Upload to Openstack

You may shrink the image by using virt-sparify

virt-sparsify --compress gentoo.img gentoo-$(date +%Y-%m-%d).img

Once you have a valid image you can upload to openstack:

glance image-create --name 'gentoo (20150507) x86_64' --disk-format qcow2 --container-format bare --is-public true --file gentoo.img --progress

TODO

  • app-emulation/openstack-guest-agents-unix?
  • remove /usr/src? remove /usr/portage? the both combined make up 2GB (out of 3GB) of the resultant image

Kernel

  • memory compaction/hotplug
  • namespaces/cgroups (for docker)
  • iptables/networking options
  • hugetlb?
  • ecrypt
  • mdraid
  • non-module virtio support
  • drbd
  • cirrus/hyper-v/qxl/etc graphics
  • disk hotplug: CONFIG_HOTPLUG=y CONFIG_ACPI_HOTPLUG_CPU=y CONFIG_HOTPLUG_PCI=y
  • ensure SYSFS deprecated features are not enabled
cirrus
ttm
ppdev
drm_kms_helper
parport_pc
serio_raw
ghash_clmulni_intel
parport
i2c_piix4
ata_generic
pata_acpi

piix4_smbus

imexps/s

ACPI PCI Interrupt Link LNKC
LNKA
hid-generic
tsc
mousedev
usbcore
usbserial
serio
i8042
libphy
ata_piix
pci_hotplug
pciehp
intel_idle
tsc
uhci_hcd
i2c_piix4
virtio-pci

# 2023 update
nvme{t,of}
wireguard
bpf
virtio drivers (gpu, etc)
updated filesystem support (ntfs rw, smb server, newer nfs features, etc)
updated networking support (nftable, iptable, ipset, hashes, etc)
efi
systemd

LINKS

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Create gentoo openstack-compatible images

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