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Applies to SUSE Linux Enterprise Server 15 SP3, K3s 1.20.14

4 Component model

This section describes the various components being used to create a K3s solution deployment, in the perspective of top to bottom ordering. When completed, the K3s instance can be used as the application infrastructure for cloud-native workloads and can be imported into SUSE Rancher for management.

4.1 Component overview

By using:

  • Software

    • Kubernetes Platform - K3s

    • Linux Operating System - SUSE Linux Enterprise Server

  • Compute Platform

    • Cisco UCS

you can create the necessary infrastructure and services. Further details for these components are described in the following sections.

4.2 Software - K3s

K3s is packaged as a single binary, which is about 50 megabytes in size. Bundled in that single binary is everything needed to run Kubernetes anywhere, including low-powered IoT and Edge-based devices. The binary includes:

  • the container runtime

  • important host utilities such as iptables, socat and du

The only OS dependencies are the Linux kernel itself and a proper dev, proc and sysfs mounts (this is done automatically on all modern Linux distributions). K3s bundles the Kubernetes components:

  • kube-apiserver,

  • kube-controller-manager,

  • kube-scheduler,

  • kubelet and

  • kube-proxy

into combined processes that are presented as a simple server and agent model, as represented in the following figure:

K3s overview
Figure 4.1: Component Overview - K3s

K3s can run as a complete cluster on a single node or can be expanded into a multi-node cluster. Besides the core Kubernetes components, these are also included:

  • containerd,

  • Flannel,

  • CoreDNS,

  • ingress controller and

  • a simple host port-based service load balancer.

All of these components are optional and can be swapped out for your implementation of choice. With these included components, you get a fully functional and CNCF-conformant cluster so you can start running apps right away. K3s is now a CNCF Sandbox project, being the first Kubernetes distribution ever to be adopted into sandbox.

Tip
Tip

Learn more information about K3s

As K3s can be deployed on a single or multiple nodes, the next sections describe the suggested component layering approach.

4.3 Software - SUSE Linux Enterprise Server

SUSE Linux Enterprise Server (SLES) is an adaptable and easy-to-manage platform that allows developers and administrators to deploy business-critical workloads on-premises, in the cloud and at the edge. It is a Linux operating system that is adaptable to any environment – optimized for performance, security and reliability. As a multimodal operating system that paves the way for IT transformation in the software-defined era, this simplifies multimodal IT, makes traditional IT infrastructure efficient and provides an engaging platform for developers. As a result, one can easily deploy and transition business-critical workloads across on-premises and public cloud environments.

Designed for interoperability, SUSE Linux Enterprise Server integrates into classical Unix and Windows environments, supports open standard interfaces for systems management, and has been certified for IPv6 compatibility. This modular, general purpose operating system runs on four processor architectures and is available with optional extensions that provide advanced capabilities for tasks such as real time computing and high availability clustering. SUSE Linux Enterprise Server is optimized to run as a high performing guest on leading hypervisors and supports an unlimited number of virtual machines per physical system with a single subscription. This makes it the perfect guest operating system for virtual computing.

4.4 Compute Platform

Leveraging the enterprise grade functionality of the operating system mentioned in the previous section, many compute platforms can be the foundation of the deployment:

  • Virtual machines on supported hypervisors or hosted on cloud service providers

  • Physical, baremetal or single-board computers, either on-premises or hosted by cloud service providers

Note
Note

To complete self-testing of hardware with SUSE YES Certified Process, you can download and install the respective SUSE operating system support-pack version of SUSE Linux Enterprise Server and the YES test suite. Then run the tests per the instructions in the test kit, fixing any problems encountered and when corrected, re-run all tests to obtain clean test results. Submit the test results into the SUSE Bulletin System (SBS) for audit, review and validation.

Tip
Tip

Certified systems and hypervisors can be verified via SUSE YES Certified Bulletins and then can be leveraged as supported nodes for this deployment, as long as the certification refers to the respective version of the underlying SUSE operating system required.

Cisco UCS C-Series Rack Servers

Cisco UCS C-Series Rack Servers delivers unified computing in an industry-standard form factor to reduce TCO and increase agility. Each server addresses varying workload challenges through a balance of processing, memory, I/O, and internal storage resources. These servers can be deployed as stand-alone servers or as part of a Cisco Unified Computing System (Cisco UCS) managed environment to take advantage of Cisco’s standards-based unified computing innovations that help reduce customers’ Total Cost of Ownership (TCO) and increase their business agility. ~

Server product-line and model options abound in the Cisco UCS C-Series Rack Servers, including:

  • Cisco UCS C240 SD M5 is a high-performance compute solution in a dense 2-socket, 2-Rack-Unit, 22” form-factor to handle the most critical real-time compute applications. This front-access server can be deployed as stand-alone servers or as part of a Cisco Unified Computing System (Cisco UCS) to deliver an exceptional management experience for a variety of applications by:

    • incorporating the 2nd generation of Intel Xeon Scalable processors, Intel Optane Memory, and various drive options including All-NVMe, SAS and SATA drives.

    • being density optimized to accommodate space constrained environments while still offering industry-leading performance and expandability. It supports a wide range of workloads from enterprise to edge applications such as Multi-access Edge Compute (MEC).

    Note
    Note

    Cisco UCS Hardware Compatibilty List provides a lookup tool for Servers & OS Support, for versions of SUSE offerings.

  • Cisco Intersight:: To simplify multiple compute module setups and configurations, leverage Cisco Intersight which is is an API driven, cloud-based system management platform that integrates with the Cisco Integrated Management Controller. It is designed to help organizations to achieve their IT management and operations with a higher level of automation, simplicity, and operational efficiency. It is a new generation of global management tool for the Cisco UCS and Cisco HyperFlex systems and provides a holistic and unified approach to managing the customers’ distributed and virtualized environments. Cisco Intersight simplifies the installation, monitoring, troubleshooting, upgrade, and support for your infrastructure with the following benefits:

    • Provide Cloud Based Management: The ability to manage Cisco UCS and Cisco HyperFlex from the cloud provides the customers the speed, simplicity, and easy scaling in the management of their infrastructure whether in the datacenters or remote and branch office locations.

    • Automation: Unified API in Cisco UCS and Cisco HyperFlex systems enables policy-driven configuration and management of the infrastructure and it makes Intersight itself and the devices connected to it fully programmable and DevOps friendly. An even more advanced infrastructure-as-code approach with Intersight can use Terraform.

    • Analytics and Telemetry: Intersight monitors the health and relationships of all the physical and virtual infrastructure components. It also collects telemetry and configuration information for developing the intelligence of the platform in the way in accordance with Cisco information security requirements.

    • Connected Cisco Technical Assistance Center (TAC): Solid integration with Cisco TAC enables more efficient and proactive technical support. Intersight provides enhanced operations automation by expediting sending files to speed troubleshooting.

    • Recommendation Engine: Driven by analytics and machine learning, Intersight recommendation engine provides actionable intelligence for IT operations management from the daily increasing knowledge base and practical insights learned in the entire system.

    • Management as A Service: Cisco Intersight provides management as a service and is designed to be infinitely scalable and easy to implement. It relieves users of the burden of maintaining systems management software and hardware.

Note
Note

A sample bill of materials, in the Chapter 9, Appendix, cites the necessary quantites of all components, along with a reference to the minimum resource requirements needed by the software components.

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