constellation/terraform/libvirt

Auotmated local image testing with QEMU / libvirt / terraform

Usage

Prerequisite:

• qcow2 constellation image
• setup
• qemu-metadata-api

Optional: Write a terraform.tfvars file in the terraform workspace (terraform/libvirt), defining required variables and overriding optional variables. See variables.tf for a description of all available variables.

constellation_coreos_image="/path/to/image.qcow2"
# optional other vars, uncomment and change as needed
# control_plane_count=3
# worker_count=2
# vcpus=2
# memory=2048
# state_disk_size=10
# ip_range_start=100
# machine="q35"

Create terraform resources from within terraform workspace (terraform/libvirt):

cd terraform/libvirt
terraform init
terraform plan
terraform apply

# set CONST_DIR to your constellation workspace
export TF_DIR=$(pwd)
export CONST_DIR=$(pwd)
go run ../../hack/terraform-to-state/create-state.go  "${TF_DIR}" "${CONST_DIR}"

# use constellation (everything after constellation create)
constellation config generate qemu
# run cdbg if using a debug image
cdbg deploy
constellation init

# cleanup
rm constellation-state.json constellation-mastersecret.base64 constellation-admin.conf wg0.conf
terraform destroy

Setup libvirt & Terraform

Ubuntu

General reference

# Install Terraform
curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
sudo apt-get update && sudo apt-get install terraform
# install libvirt, KVM and tools
sudo apt install qemu-kvm libvirt-daemon-system xsltproc
sudo systemctl enable libvirtd
sudo usermod -a -G libvirt $USER
# reboot

Fedora

sudo dnf install -y dnf-plugins-core
sudo dnf config-manager --add-repo https://rpm.releases.hashicorp.com/fedora/hashicorp.repo
sudo dnf -y install terraform qemu-kvm libvirt-daemon-config-network libvirt-daemon-kvm xsltproc
sudo usermod -a -G libvirt $USER
# reboot

Change libvirt settings (on Ubuntu)

Open /etc/libvirt/qemu.conf and change the following settings:

security_driver = "none"

Then restart libvirt

sudo systemctl restart libvirtd

Setup emulated TPM (on Ubuntu)

Only works if swtpm is version 0.7 or newer! Ubuntu currently ships swtpm 0.6.3 so you need to install swtpm from launchpad.

1. Uninstall current version of swtpm (if installed)

   sudo apt remove swtpm swtpm-tools
   

2. Add ppa (this command shows the ppa for Ubuntu 22.04 jammy but others are available)

   sudo add-apt-repository ppa:stefanberger/swtpm-jammy
   sudo apt update
   

3. Install swtpm

   sudo apt install swtpm swtpm-tools
   

4. Patch configuration under /etc/swtpm_setup.conf

   # Program invoked for creating certificates
   create_certs_tool = /usr/bin/swtpm_localca
   

5. Patch ownership of /var/lib/swtpm-localca

   sudo chown -R swtpm:root /var/lib/swtpm-localca
   

Misc

• List all domains: virsh list --all
• Destroy domain with nvram: virsh undefine --nvram <name>