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Applies to SUSE Linux Enterprise Server 15 SP3, K3s 1.20.14, SUSE Rancher 2.5.12

4 Component model

This section describes the various components being used to create a SUSE Rancher solution deployment, in the perspective of top to bottom ordering. Once completed, the SUSE Rancher instance enables the management of multiple, downstream Kubernetes clusters.

4.1 Component overview

By using:

  • Software

    • Multi-cluster Management Server - SUSE Rancher

    • Kubernetes Platform - K3s

    • Linux Operating System - SUSE Linux Enterprise Server

  • Compute Platform

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

4.2 Software - SUSE Rancher

SUSE Rancher is a Kubernetes native multi-cluster container management platform. It addresses these challenges by delivering the following key functions, as shown in the following figure:

Rancher overview
Figure 4.1: Component Overview - SUSE Rancher
Certified Kubernetes Distributions

SUSE Rancher supports management of any CNCF certified Kubernetes distribution for:

  • development, edge, branch workloads, SUSE offerings like K3s, a CNCF certified lightweight distribution of Kubernetes

  • workload infrastructures, either on-premise or public-cloud based, SUSE offerings like Rancher Kubernetes Engine (RKE) or Rancher Kubernetes Engine Government (RKE2), as CNCF certified Kubernetes distributions for both bare-metal and virtualized servers

  • the public cloud, hosted Kubernetes services like

    • Amazon Elastic Kubernetes Service (EKS⁠[4]),

    • Azure Kubernetes Service (AKS⁠[5]) and

    • Google Kubernetes Engine (GKE⁠[6]).

Simplified Cluster Operations and Infrastructure Management

SUSE Rancher provides simple, consistent cluster operations including provisioning and templates, configuration and lifecycle version management, along with visibility and diagnostics.

Security and Authentication

SUSE Rancher integrates and utilizes existing directory services, to automate processes and apply a consistent set of identity and access management (IAM) plus security policies for all the managed clusters, no matter where they’re running.

Policy Enforcement and Governance

SUSE Rancher includes audit and security guideline enforcement, monitoring and logging functions, along with user, network and workload policies distributed across all managed clusters.

Platform Services

SUSE Rancher also provides a rich catalog of services for building, deploying and scaling containerized applications, including app packaging, logging, monitoring and service mesh.

Tip
Tip

Learn more information about SUSE Rancher

For a production implementation of SUSE Rancher, deploying upon a Kubernetes platform is required and the next sections describe the suggested component layering approach.

4.3 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 4.2: 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

4.4 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-premise 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.

4.5 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-premise 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 once 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.

Even with the broad certification and support model across the range of available HPE platform models, the following table summarizes which might be a best-practice selection for the various deployment types and focus areas:

Table 4.1: Hewlett Packard Enterprise Platform Matrix for Deployment Types
System PlatformBaremetalHypervisorVirtual Machine

ProLiant

DL360,DL380

DL360,DL380

(hosting)

Synergy

SY480

SY480

(hosting)

As listed in the previous table, multiple server product-line and model options abound in the HPE server portfolio, as detailed in the following sections.

4.5.1 Hewlett Packard Enterprise iLO

The Hewlett Packard Enterprise iLO [iLO] arms you with the tools to manage your servers efficiently, resolve issues quickly, and keep your business running – from anywhere in the world, allowing you to manage your entire server environment with ease. Upgrade the basic iLO license for additional functionality, such as graphical remote console, multi-user collaboration, video record/playback, remote management, and much more. The latest iLO innovations include:

  • Security and performance

  • Support for Simple Certificate Enrollment Protocol [SCEP]

  • Enablement for 802.1x protocol to securly onboarc servers into a network

  • Redfish API Conformance

4.5.2 HPE ProLiant DL Rack Servers

The HPE ProLiant DL family of servers are the most flexible, reliable, and performance-optimized HPE ProLiant rack servers—ever. HPE continues to provide industry-leading compute innovations. The new HPE ProLiant rack portfolio, with flexible choices and versatile design, along with improved energy efficiencies, ultimately lowers your TCO. Integrated with a simplified, but comprehensive management suite and industry-leading support, the HPE ProLiant rack portfolio delivers a more reliable, fast, and secure infrastructure solution, helps increase IT staff productivity, and accelerates service delivery. In addition, the rack portfolio is performance-optimized for multiapplication workloads to significantly increase the speed of IT operations and enable IT to respond to business needs of any size, faster.

Specific models that offer relevant choices for Enterprise Kubernetes are:

HPE ProLiant DL380

The industry-leading HPE DL380 2P/2U server with world-class performance and supreme versatility for multi-workload compute server delivers the latest in security, performance and expandability, backed by a comprehensive warranty. Standardize on the industry’s most trusted compute platform. The HPE DL380 server is securely designed to reduce costs and complexity, featuring:

  • the First, Second, Third Generation Intel Xeon Processor Scalable Family with up to a 60% performance gain1 and 27% increase in cores2

  • the HPE 2933 MT/s DDR4 SmartMemory supporting 3.0 TB

  • support of 12 Gb/s SAS, and up to 20 NVMe drive plus a broad range of compute options

  • HPE Persistent Memory offers unprecedented levels of performance for databases and analytic workloads to run everything from the most basic to mission-critical applications and deploy with confidence.

HPE ProLiant DL360

Adaptable for diverse workloads and environments, the compact 1U HPE DL360 server delivers security, agility and flexibility without compromise. It supports:

  • the Intel Xeon Scalable processor with up to a 60% performance gain1 and 27% increase in cores2

  • along with 2933 MT/s HPE DDR4 SmartMemory supporting up to 3.0 TB2 with an increase in performance of up to 82%3

  • the added performance that HPE Persistent Memory6, HPE NVDIMMs7 and 10 NVMe bring, the HPE DL360 means business. Deploy, update, monitor and maintain with ease

  • automating essential server life cycle management tasks with HPE OneView and HPE Integrated Lights Out to deploy this 2P secure platform for diverse workloads in space constrained environments.

Note
Note

HPE Servers Support & OS Certification Matrices outlines the minimum version of SLE required for installation, yet later service pack releases may also be used and supported.

4.5.3 HPE Synergy Servers

HPE Synergy, the first Composable Infrastructure, empowers IT to create and deliver new value easily and continuously. This single infrastructure reduces operational complexity for traditional workloads and increases operational velocity for the new breed of applications and services. Through a single interface, HPE Synergy composes compute, storage and fabric pools into any configuration for any application. It also enables a broad range of workloads — from bare metal, to virtual machines, to containers, to operational models like hybrid cloud and DevOps. HPE Synergy enables IT to rapidly react to new business demands with the following components:

  • HPE Synergy 12000 Frames are uniquely architected as Composable Infrastructure (CI) to match the powerful 'infrastructure-as-code' capabilities of the HPE intelligent software architecture. Flexible access to compute, storage, and fabric resources allows for use and re-purposing. Linking multiple HPE Synergy Frames efficiently scales the infrastructure with a dedicated single view of the entire management network.

    • Creating multiple composable domains in the infrastructure can efficiently deliver available resources to the business. HPE Synergy Frames reduce complexity by using intelligent auto-discovery to find all available resources to accelerate workload deployments. This drives IT efficiency as the business grows and delivers balanced performance across resources to increase solution effectiveness.

  • With HPE Synergy SY480 Compute Module, one gains operational efficiency and control, and can deploy IT resources quickly for any workload through a single interface. HPE Synergy is a powerful software-defined solution. HPE Synergy Composable Compute resources create pools of flexible compute capacity that can be configured almost instantly to rapidly provision infrastructure for a broad range of applications. The HPE Synergy SY480 Compute Module delivers an efficient and flexible two-socket workhorse to support most demanding workloads. Powered by:

    • Intel Xeon Scalable Family of processors

    • up to 4.5 TB DDR4, more storage capacity and controllers

    • a variety of GPU options within a composable architecture HPE Synergy SY480 Compute Module is the ideal platform for general-purpose enterprise workload performance now and in the future.

Note
Note

HPE Servers Support & OS Certification Matrices outlines the minimum version of SLE required for installation, yet later service pack releases may also be used and supported.

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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