custom-ubuntu-2204-cloud-img

Custom Ubuntu 22.04 image as sample for Packer usage

About

This repo is an example of building a custom qcow based VM image by customizing an upstream Ubuntu 22.04 cloud image.

Image build and publication happens automatically on PR merge via GitHub actions for free.

Resulting image is published as a GitHub release asset after the merge commit.

See the releases page for the latest info.

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Local development

Reqs:

• Machine w/ Qemu/KVM (tested on Ubuntu 22.04 IBM Cloud VM).

Install required deps and build image:

./install_packer_and_build.sh

After, e.g. to boot:

sudo qemu-img convert -O qcow2 output/custom-ubuntu-22.04-x86_64 /var/lib/libvirt/images/ubuntu-image.qcow2

sudo qemu-img resize -f qcow2 /var/lib/libvirt/images/ubuntu-image.qcow2 32G

sudo virt-install \
    --connect qemu:///system \
    --name ubuntu-image \
    --memory 2048 \
    --vcpus 2 \
    --os-variant ubuntu22.04 \
    --disk path=/var/lib/libvirt/images/ubuntu-image.qcow2,bus=virtio \
    --import \
    --noautoconsole \
    --network network=default,model=virtio \
    --graphics none \
    --console pty,target_type=serial

To connect:

sudo virsh domifaddr ubuntu-image

ssh -i <priv_key_path> ssh-user@<addr>

To stop:

sudo virsh destroy ubuntu-image
sudo virsh undefine ubuntu-image

Misc

Keep external-deps-and-pkgs.json sorted with:

jq -S 'walk(if type == "array" then sort else . end)' external-deps-and-pkgs.json > temp.json && mv temp.json external-deps-and-pkgs.json