Assisted-Installer-DevConf-US-2021
Since announcing Openshift version 4, deploying a single OpenShift cluster has become pretty simple. However, simple does not mean scalable, especially when you need to deploy tens, hundreds or even thousands of clusters. For example, a cellular company deploying OpenShift on Edge at the base of each of their cell towers. It would be very difficult to try and manage this using the default deployment tool. Zero Touch Provisioning (ZTP), along with GitOps methodologies, can be leveraged to automate OpenShift deployment in parallel to multiple sites, without human intervention. ZTP is a component of Open Cluster Management (OCM), an operator that enables a single OCP cluster to manage a fleet of clusters. This functionality uses declarative APIs to enable the configuration of a vast number of OpenShift clusters. ZTP integrates multiple open-source projects: OCM, Hive, Assisted Installer and Metal³. In this session, you will learn about ZTP architecture and its components. We will discuss the installation flow and how the components interact with each other. We will learn about the possibility of installing in an air-gapped environment (disconnected from the Internet) and finally demonstrate how to install a Single Node Openshift on bare metal using only a few manifests.
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Assisted-Installer-DevConf-US-2021
- 1. Look Ma, no hands! Zero Touch Provisioning for OpenShift Fred Rolland Principal Software Engineer @Freddy_Rolland Nir Magnezi Senior Software Engineer @nirmagnezi 1 DevConf.US 2021
- 2. 2 Multi Cluster Management for Kubernetes ▸ Kubernetes as standard ▸ Multi clusters, multi cloud ▸ Management
- 3. 3 Multicluster lifecycle management Policy driven governance, risk, and compliance Advanced application lifecycle management https://open-cluster-management.io/ https://operatorhub.io/operator/cluster-manager https://github.com/open-cluster-management Open Cluster Management
- 4. 4 Single Node Openshift ▸ Single Server ▸ Control & Worker ▸ Bootstrap In Place https://github.com/openshift/enhancements/tree/master/enhancements/single-node
- 5. 5 Deploying SNO at scale https://github.com/openshift/hive Requirements: ▸ Bare Metal Spoke clusters ▸ Minimal performance impact on Hub cluster ▸ Declarative API ▸ Disconnected Environment ▸ 1000 Spoke clusters
- 6. 6 Assisted Installer ▸ No need for additional bootstrap server ▸ Agent Based with Discovery ISO ▸ Supports SNO ▸ SAAS, require access to the internet ▸ REST API ▸ Boot It Yourself https://github.com/openshift/assisted-service https://console.redhat.com/openshift/assisted-installer/clusters/~new https://github.com/metal3-io
- 7. 7 Putting it all together OCM Metal³ Assisted Installer Hive
- 8. High Level Flow Hub Cluster Bare Metal BMC ▸ OCP installed Openshift Assisted Installer Hive Bare Metal Operator OCM ISO Discovery Agent Single Node Openshift klusterlet AddOns Steps: ▸ AI creates discovery ISO ▸ BMO boots BM via BMC ▸ AI Discovery agents reports ▸ Installation starts ▸ OCM applies policies ▸ OCM import cluster ▸ Hive report to OCM
- 9. 9 ZTP API ClusterDeployment - Base DNS Domain - Cluster Install Ref - Pull Secret Ref ... InfraEnv - SSH key - Proxy - Ignition ... BareMetalHost - BMC Credential Ref - BootMACAddress .. ClusterImageSet - Release Image AgentClusterInstall - API VIP - Ingress VIP - Service Network - Cluster Network CIDR - Control Plane Agents - Image Set Ref - Cluster Deployment Ref ... PullSecret Agent - Host Name - Installation Disk - Ignition override - Installer args... NMStateConfig NMStateConfig NMStateConfig - Interfaces - MAC address - IP - Routes ... NMStateConfigLabelSelector Secret BMC credentials Label https://github.com/openshift/assisted-service/tree/master/docs/hive-integration/crds Managed Cluster Klusterlet AddonConfig
- 10. 10 Demo
- 11. 11 Let’s deploy 1000 SNOs!
- 12. 12 ● Initialized: CRs for a cluster is created/applied ● Booted: BMH booted the remote machine with discovery ISO ● Discovered: Agent CR created on hub (discovery complete) ● Provisioning: Installation in progress ● Completed: OCP installed ● Managed: OCM imported the cluster Let’s deploy 1000 SNOs! https://github.com/open-cluster-management/assisted-installer-batch-deploy-tool
- 14. 14 Git Ops Deployment Key performance parameters, operators and networking definitions Kustomize Source Git Repo Site specific data overlaid onto performance profiles. All declarative data Output for deployment Git OCM Declarative output automagically applied to the sites Cluster deployed in desired state Ready for workload https://github.com/openshift-kni/cnf-features-deploy/tree/master/ztp Site Planning Data
- 15. 15 ▸ Multi nodes clusters ▸ Remote Worker Node ▸ Late Binding ▸ OCM UI integration ▸ Scale up Future Roadmap
- 16. 16 ▸ https://github.com/openshift/assisted-service ▸ https://github.com/openshift/hive ▸ https://github.com/open-cluster-management ▸ https://github.com/metal3-io ▸ https://github.com/jparrill/ztp-the-hard-way ▸ https://github.com/openshift-kni/cnf-features-deploy/tree/master/ztp ▸ Try Assisted Installer at redhat.com ▸ Assisted Installer talk - DevConf CZ 2021 ▸ “A GitOps Approach to ZTP” talk Useful Links
- 17. 17 Q&A