Fornitura di Fedora CoreOS su Exoscale

Questa guida mostra come effettuare il provisioning di nuove istanze Fedora CoreOS (FCOS) su [Exoscale](https://exoscale.com) Cloud Hosting.

Prerequisiti

Fedora CoreOS supports configuring access via SSH keys using Afterburn on this platform. Once you have configured your SSH Key in the platform configuration, you can provision and access Fedora CoreOS instances with the default user core, without using an Ignition config.

We recommend using an Ignition config once you are more familiar with Fedora CoreOS and want to automate the deployment of systems.

You need to have access to an Exoscale account. Register if you don’t have one.

Uploading an FCOS image as a custom Template

Exoscale offers official FCOS templates, but they are currently out of date. For now, we recommend creating your own template. Track progress on fixing this in #1166.

Exoscale provides Custom Templates to be able to upload any cloud image. To create a Custom Template you first need to download and decompress the image.

Download and decompress the QCOW2 image with coreos-installer
FLUSSO="stabile"
coreos-installer download -d -s $FLUSSO -p exoscale -f qcow2.xz

Alternatively, QCOW2 images can be downloaded from the download page and manually decompressed.

Next you can Register a Custom Template. This can be done from the Web Portal or the Exoscale CLI. Either option requires the uncompressed image to be uploaded somewhere public and for the URL and an MD5 checksum to be provided during registration. One option is to use the object storage provided by Exoscale to host the image.

Upload to Object Storage and create Custom Template
# Set the version and calculate the checksum
FCOS_VERSION='...'
FILE="fedora-coreos-${FCOS_VERSION}-exoscale.x86_64.qcow2"
CHECKSUM=$(md5sum "${FILE}" | cut -d " " -f 1)

# Upload to object storage
BUCKET='newbucket'
exo storage mb "sos://${BUCKET}"
exo storage upload --acl public-read "${FILE}" "sos://${BUCKET}/image-import/"

# Create the template using given URL and CHECKSUM
URL=$(exo storage show "sos://${BUCKET}/image-import/${FILE}" --output-template "{{.URL}}")
TEMPLATE="fedora-coreos-${FCOS_VERSION}"
exo compute instance-template register --boot-mode=uefi $TEMPLATE $URL $CHECKSUM

You can then view the template using exo compute instance-template show --visibility=private $TEMPLATE.

Avvio di un’istanza VM

You can provision a FCOS instance using the Exoscale Web Portal or via the Exoscale CLI.

You will need to use at least version v1.54.0 of the Exoscale CLI.
Do not use the --cloud-init-compress argument to the CLI. It causes the Ignition config to be passed compressed to the instance and Ignition doesn’t tolerate that.
Add your ssh-key
exo compute ssh-key register key-name /path/to/key
Launching a new instance with Exoscale CLI
NAME='worker'
TYPE='standard.medium'
DISK='10' # in GiB
SSHKEY='key-name'
TEMPLATE=$TEMPLATE # template name set above
exo compute instance create "${NAME}" \
    --disk-size $DISK \
    --ssh-key "${SSHKEY}" \
    --template $TEMPLATE \
    --template-visibility private \
    --cloud-init "path/to/ignition-file.ign"
If just SSH access is desired and no further customization is required, you don’t need to pass any Ignition file and can omit the --cloud-init argument.
You can find out the instance’s assigned IP by running exo compute instance show "${NAME}"

Ora dovresti poter effettuare l’accesso SSH all’istanza utilizzando l’indirizzo IP associato.

Esempio di connessione
ssh core@<indirizzo ip>

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