OSBuild operator for OS lifecycle management

Published on Jul 27, 2022 by Danielle Barda on osbuild oslifecycle

The OSBuild operator provides a kubernetes API by the means of new Custom Resource Definitions for building OSTree images as part of OS lifecycle management, in flotta project.

The first release of the operator allows the user to build edge-container for RHEL images (RHEL >= 8.6) and make them accessible in S3 bucket.

Please see below the step-by-step guide for producing a new edge-container image. A complete demo can be found here

Prerequisites installation

Clone the osbuild-operator repository

git clone https://github.com/project-flotta/osbuild-operator.git
cd osbuild-operator

Store a RHEL image in an accessible endpoint for creating osbuild-workers

Here we will use Nexus for storing a RHEL image and make it accessible for installing OSBuild-Worker VMs.
Deploy Nexus operator by following the instruction here and after deploying Nexus operator finished, create a new Nexus instance by running

oc apply -n osbuild -f config/creating_env/deploy_nexus.yaml

Install the Nexus CLI

pip install nexus3-cli

Login to Nexus

export CLUSTER_DOMAIN='mycluster.example.com'
oc get secret -n osbuild nexus-osbuild-admin-credentials -o jsonpath={.data.password} | base64 -d | xargs nexus3 login --url https://nexus-osbuild-osbuild.apps.${CLUSTER_DOMAIN} --no-x509_verify --username admin --password

Create a Hosted Raw repository named disk-images

nexus3 repository create hosted raw disk-images

Upload the rhel qcow2 image (it was tested with RHEL 8.6)

nexus3 upload rhel-8.6-x86_64-kvm.qcow2 disk-images

Create an S3 service

Deploy MinIO

oc apply -n osbuild -f config/creating_env/deploy_minio.yaml

Create a bucket name osbuild-images. You can use the aws cli (please follow the installation instructions)

export CLUSTER_DOMAIN='mycluster.example.com'
AWS_ACCESS_KEY_ID=minioadmin AWS_SECRET_ACCESS_KEY=minioadmin aws --endpoint-url https://minio-s3-osbuild.apps.${CLUSTER_DOMAIN} --no-verify-ssl s3 mb s3://osbuild-images

Create a secret for the S3 credentials

oc create secret generic osbuild-s3-credentials -n osbuild --from-literal=access-key-id=minioadmin --from-literal=secret-access-key=minioadmin

Create a secret for the CA Bundle using the OCP route

oc get secrets -n openshift-ingress-operator router-ca -o "jsonpath={.data.tls\.crt}" | base64 -d > /tmp/ca-bundle
oc create secret generic osbuild-s3-ca-bundle -n osbuild --from-file=/tmp/ca-bundle

Create a Secret for your Red Hat Credentials

Find your Red Hat credentials and create a secret:

oc create secret generic redhat-portal-credentials -n osbuild --from-literal=username=<USERNAME> --from-literal=password=<PASSWORD>

Create a PostgreSQL Server

Currently, the controller does not support creating the PostgreSQL server on its own, making this step mandatory

Edit the file config/creating_env/psql.env and set a real password

Create the PostgreSQL server by running

oc new-app --env-file config/creating_env/psql.env postgresql:13-el8 -n osbuild

Edit the file config/creating_env/postgress_secret.yaml with the same password

Create new secret (please enter a real encoded password)

oc create -f config/creating_env/postgress_secret.yaml

Provision an External Worker VM using CNV

Create an SSH key-pair

ssh-keygen -t rsa -b 4096 -C cloud-user@external-builder -f ~/.ssh/external-builder

Create symlinks to the files to facilitate the next step

ln -s ~/.ssh/external-builder.pub config/creating_env/ssh-publickey
ln -s ~/.ssh/external-builder config/creating_env/ssh-privatekey

Generate the secret

oc create secret generic external-builder-ssh-pair --from-file=config/creating_env/ssh-privatekey --from-file=config/creating_env/ssh-publickey -n osbuild

Deploy the VM

oc apply -n osbuild -f config/creating_env/external-worker-vm.yaml
oc wait -n osbuild --for='condition=Ready' vm/external-builder

Get VM Address

oc get vmi external-builder -o jsonpath={.status.interfaces[0].ipAddress}

Create OSBuildEnvConfig singleton CR

Apply OSBuildEnvConfig

export CLUSTER_DOMAIN='mycluster.example.com'
export EXTERNAL_WORKER_IP=`oc get vmi external-builder -o jsonpath={.status.interfaces[0].ipAddress}`
cat config/samples/osbuilder_v1alpha1_osbuildenvconfig.yaml | envsubst | oc apply -f -

Create an edge-container image

Apply osbuildConfig that contains all the relevant configuration for running osbuild-composer job. You can use that sample:

oc create -f config/samples/osbuilder_v1alpha1_osbuildconfig.yaml -n osbuild

After applying osbuildConfig CR you should see a new osbuild CR that was triggered automatically

oc describe osbuild osbuildconfig-sample-1 -n osbuild 

As part of that osbuild CR you can find the osbuild-composer job status, the job composer ID, and once the job finishes, you can also find the containerUrl in the S3 bucket

    - message: Edge-container job is still running
      status: ""
      type: startedContainerBuild
    - message: Edge-container job was finished successfully
      status: ""
      type: containerBuildDone
    containerComposeId: 80125a8c-6e4a-42fe-8c06-8f90398fe5b1
    containerUrl: https://minio-s3-osbuild.apps.my-cluster.example.com/osbuild-images/composer-api-2ca271b8-1a9e-4bae-bcec-ab151c2bdc5b-container.tar?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=minioadmin%2F20220720%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20220720T095954Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=ac57b8499450dd4b62b80936277db89e7e850d5c3efab9e39bb9a493c064921f

Run a VM using the newly created edge-container

Upload the tar file to container image registry

Download the tar file to your local environment

curl -k <containerUrl> -o /tmp/local.tar

Upload the image to your Container Registry using skopeo, pay attention that a Path Prefix might be required (e.g. your account name)

export IMAGE_NAME=<Container-Registry-URL>/osbuild:v1
skopeo login --username <USER> -p <PASSWORD> <Container-Registry-URL>
skopeo copy oci-archive:/tmp/local.tar docker://${IMAGE_NAME}

Run the container using podman

Run the container

podman pull ${IMAGE_NAME}
podman run --detach --name osbuild-test -p 8080:8080  ${IMAGE_NAME}

Install a VM using a kickstart file that config the ostree to point to the running container

virt-install --name device --memory 4096 --vcpu 4 --disk size=8 --location <rhel-8.6-iso-location> --initrd-inject=/home/deploy/edgedevice.ks --extra-args="ks=file:/edgedevice.ks console=tty0 console=ttyS0,115200n8"

The kickstart file should contain

ostreesetup --nogpg --url=http://<Host-Container-Machine-URL>/repo/ --osname=rhel --remote=edge --ref=rhel/8/x86_64/edge

Validate the rpm-ostre status is identical to the running container commit ID (from inside the VM)

curl -k http://<Host-Container-Machine-URL>/repo/refs/head/rhel/8/x86_64/edge
rpm-ostre status

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