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88 lines
3.1 KiB
Markdown
88 lines
3.1 KiB
Markdown
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# How to create a custom Clear Linux image
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In the context of adding more utility to the cloudguest image being used
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for integration testing, this is a quick guide on how to achieve the creation
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of your own Clear Linux image using the official Clear Linux tooling.
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## Prepare the environment
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From the host, the goal is run a Clear Linux VM that will allow us to build
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the custom image we want.
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```bash
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# Get latest CL version:
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IMG_VERSION=$(curl https://download.clearlinux.org/latest)
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# Get latest clear-kvm image:
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wget -P $HOME/workloads/ https://download.clearlinux.org/current/clear-${IMG_VERSION}-kvm.img.xz
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# Boot cloud-hypervisor VM with the downloaded image
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./cloud-hypervisor -v --kernel $HOME/workloads/vmlinux --disk clear-30970-kvm.img --cmdline "console=ttyS0 console=hvc0 reboot=k panic=1 nomodules root=/dev/vda3" --cpus 1 --memory size=1G --net tap=,mac=
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# Setup connectivity
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IFACE=$(ip route | grep default | awk -F 'dev' '{print $2}' | awk -F ' ' '{print $1}')
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GW=$(ip route | grep vmtap0 | awk -F ' ' '{print $1}')
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sudo iptables -t nat -A POSTROUTING -s ${GW} -o ${IFACE} -j MASQUERADE
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```
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## Create the image
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From the guest, we can now create the image.
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```bash
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# Setup connectivity
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sudo ip addr add 192.168.249.2/24 dev enp0s3
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sudo ip route add default via 192.168.249.1
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# Install necessary bundles
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sudo swupd bundle-add clr-installer
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sudo swupd bundle-add os-installer
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# Download and update cloudguest image configuration
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wget https://download.clearlinux.org/current/config/image/cloudguest.yaml
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sed -i '/size: \"864M\"/d' cloudguest.yaml
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sed -i 's/\"800M\"/\"2G\"/g' cloudguest.yaml
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sed -i 's/systemd-networkd-autostart/sysadmin-basic,\n systemd-networkd-autostart/g' cloudguest.yaml
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# Create the custom cloudguest image
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clr-installer -c cloudguest.yaml
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# Make the guest accessible through ssh
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sudo mkdir -p /etc/ssh
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sudo bash -c "echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config"
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```
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### Retrieve the image
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Once the new image has been created and the guest is accessible through
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`ssh`, it is time to retrieve the image from the host.
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```bash
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# Retrieve new image (this is a raw image)
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scp root@192.168.249.2:cloudguest.img .
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mv cloudguest.img clear-cloudguest-raw.img
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# Create the QCOW image from the RAW image
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qemu-img convert -p -f raw -O qcow2 clear-cloudguest-raw.img clear-cloudguest.img
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# Compress the QCOW image
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xz -k -T $(nproc) clear-cloudguest.img
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```
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## Switch CI to use the new image
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### Upload to Azure storage
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The next step is to update the image stored as part of the Azure storage
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account, replacing it with the newly created image. This will make this
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new image available from the integration tests.
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This is usually achieved through the web interface.
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### Update integration tests
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Last step is about updating the integration tests to work with this new image.
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The key point is to identify the UUID of this new image so that it can be used
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directly from the tests.
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Proceed as follow to determine this UUID:
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```bash
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# Mount the image
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sudo mount -o loop,offset=$((2048 * 512)) clear-cloudguest-raw.img /mnt/
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# Identify UUID
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cat mount_dir/loader/entries/Clear-linux-kvm-*.conf | grep "root=PARTUUID="
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# Unmount the image
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sudo umount /mnt
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```
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