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O-tomated RKE Distribution (Orked) is a collection of scripts that aims to easily and reliably set up a production-ready Kubernetes cluster based on RKE2, with Longhorn storage, that is highly performant and efficient.

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Orked

About

O-tomated RKE Distribution (Orked) is a collection of scripts that aims to easily and reliably set up a production-ready Kubernetes cluster based on RKE2, with Longhorn storage, that is highly performant and efficient.

Directory

Prerequisites

These are a list of items you must fulfill beforehand in order to successfully set up your Kubernetes cluster using Orked.

Hardware

Configuration

  • All nodes are expected to have the same service user account username and sudo password (can be updated post-install)
  • All nodes must be given a unique static IP address and hostname
  • At least one reserved private IPv4 address for the load balancer

Hardware requirements

This section contains the recommended basic hardware requirements for each of the nodes in the cluster. For additional reference, please refer to the official RKE2 documentation.

Login node

  • vCPU: 2
  • Memory: 1GB
  • Storage: 15GB
  • Number of nodes: 1

Master node

  • vCPU: 2
  • Memory: 4GB
  • Storage: 25GB
  • Number of nodes: 1

Worker node

  • vCPU: 4
  • Memory: 4GB
  • Storage:
    • OS: 50GB
    • Longhorn: 25GB
  • Number of nodes: 3

Installation

For details on how to use each of these scripts and what they are for, please refer to the following subsections. Please also ensure that you have met Orked's prerequisites before proceeding.

Important

It is highly recommended that you adhere to the following installation steps in the presented order.

Login node

  • This script sets up the Login node by installing various dependencies and tools required for managing and interacting with the Kubernetes cluster.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/login/login.sh

  • Optional environment variables:

    Option Description Sample Default
    SUDO_PASSWD The sudo password of the service user account. mypassword -

Passwordless access

Note

This script requires the PasswordAuthentication SSH configuration option to be set to yes (default) on all of the Kubernetes nodes in the cluster. They may be updated to no after the script completes for better security.

  • This script sets up the Login node for passwordless SSH access to all the nodes in the Kubernetes cluster.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/passwordless.sh

  • Optional environment variables:

    Option Description Sample Default
    SERVICE_USER The username of the service user account. myuser -
    SSH_PORT The SSH port used on the Kubernetes nodes. 2200 22
    SSH_KEY_TYPE The SSH key type to generate and use on the Login node. ecdsa ed25519
    SSH_KEY The path to the private SSH key to use on the Login node. /home/myuser/.ssh/mykey ${HOME}/.ssh/id_${SSH_KEY_TYPE}
    PUBLIC_SSH_KEY The path to the public SSH key to use on the Login node. /home/myuser/.ssh/mykey.pub ${SSH_KEY}.pub

Hostname resolution

Note

A minimum of limited name resolution between nodes is required for the Kubernetes cluster to be set up and functional.

  • This script automates the process of updating the hostname entries on all nodes in the cluster, including the Login node. It ensures that all nodes in the cluster have the necessary name resolution between them.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/hostname-resolution.sh

  • Optional environment variables:

    Option Description Sample Default
    SERVICE_USER The username of the service user account. myuser -
    SUDO_PASSWD The sudo password of the service user account. mypassword -
    SSH_PORT The SSH port used on the Kubernetes nodes. 2200 22

Kubernetes node configuration

  • This script configures the to-be Kubernetes nodes by setting up networking, disabling unnecessary services and functionalities, and performing several other best practice configurations for Kubernetes in a production environment.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/configure.sh

  • Optional environment variables:

    Option Description Sample Default
    SERVICE_USER The username of the service user account. myuser -
    SUDO_PASSWD The sudo password of the service user account. mypassword -
    SSH_PORT The SSH port used on the Kubernetes nodes. 2200 22

RKE2 installation

  • RKE2, also known as RKE Government, is Rancher's next-generation Kubernetes distribution. It is a fully conformant Kubernetes distribution that focuses on security and compliance within the U.S. Federal Government sector.

  • This script automates the installation and configuration of RKE2 on the Master and Worker nodes. It performs all the necessary steps to set up a fully functional RKE2 cluster.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/rke.sh

  • Optional environment variables:

    Option Description Sample Default
    SERVICE_USER The username of the service user account. myuser -
    SUDO_PASSWD The sudo password of the service user account. mypassword -
    SSH_PORT The SSH port used on the Kubernetes nodes. 2200 22
    RKE2_CHANNEL The channel to use for fetching the RKE2 download URL. latest stable
    RKE2_VERSION The version of RKE2 to download and install. v1.30.1+rke2r1 v1.25.15+rke2r2
    RKE2_SCRIPT_URL The URL to the RKE2 installation script. https://example.com/install.sh https://get.rke2.io
    RKE2_CLUSTER_CIDR The CIDR block for pod network. 10.44.0.0/16 10.42.0.0/16
    RKE2_SERVICE_CIDR The CIDR block for cluster services. 10.45.0.0/16 10.43.0.0/16

Longhorn storage

Note

This script requires all Worker nodes to have a dedicated virtual disk attached for use as Longhorn storage. The default virtual disk (LONGHORN_STORAGE_DEVICE) value is /dev/sdb, you can verify this using the lsblk command on each node.

  • Longhorn is a lightweight, reliable, and powerful distributed block storage system for Kubernetes.

  • This script automates the installation and configuration of Longhorn on the Worker nodes, and setting up each of their dedicated virtual disk. It ensures that all required components and configurations are applied correctly for setting up the Longhorn storage.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/longhorn.sh

  • Optional environment variables:

    Option Description Sample Default
    SERVICE_USER The username of the service user account. myuser -
    SUDO_PASSWD The sudo password of the service user account. mypassword -
    SSH_PORT The SSH port used on the Kubernetes nodes. 2200 22
    LONGHORN_STORAGE_DEVICE The Longhorn storage device name. /dev/sdc /dev/sdb

MetalLB load balancer

Note

This script requires you to designate at least a single private IP address to be allocated to the MetalLB load balancer.

  • MetalLB is a load-balancer implementation for bare metal Kubernetes clusters, using standard routing protocols.

  • This script automates the deployment and configuration of MetalLB using a set of predefined configurations and user-reserved private IP addresses.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/metallb.sh

Ingress NGINX

  • Ingress NGINX Controller is an Ingress controller for Kubernetes using NGINX as a reverse proxy and load balancer. Ingress in Kubernetes is an API object that manages external access to the services in a cluster, typically HTTP. It may also provide load balancing, SSL termination and name-based virtual hosting.

  • This script automates the deployment and configuration of the Ingress NGINX Controller on a Kubernetes cluster, specifically tailored for bare metal environments.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/ingress.sh

  • Optional environment variables:

    Option Description Sample Default
    NGINX_HTTP The port used for routing HTTP traffic to the NGINX ingress controller. 8080 80
    NGINX_HTTPS The port used for routing HTTPS traffic to the NGINX ingress controller. 8443 443
    NGINX_WEBHOOK The port used for handling admission webhook traffic by the NGINX ingress controller. 8554 8443

Cert-Manager

Note

This requires a registered Cloudflare account which could be acquired for free.

  • cert-manager is a powerful and extensible X.509 certificate controller for Kubernetes and OpenShift workloads. It will obtain certificates from a variety of Issuers, both popular public Issuers as well as private Issuers, and ensure the certificates are valid and up-to-date, and will attempt to renew certificates at a configured time before expiry.

  • This script automates the setup and configuration of cert-manager in a Kubernetes cluster, using Cloudflare for DNS validation. It ensures that cert-manager is correctly installed, configured, and integrated with Cloudflare for issuing Let's Encrypt certificates.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/cert-manager.sh

  • Optional environment variables:

    Option Description Sample Default
    CF_EMAIL The Cloudflare user email used for API authentication. myuser@example.com -
    CF_API_KEY The Cloudflare API key used for API authentication. mycloudflareapikey -

SMB storage (Optional)

Note

This requires an already existing SMB server for use in the Kubernetes cluster.

  • SMB CSI Driver for Kubernetes allows Kubernetes to access SMB server on both Linux and Windows nodes. It requires existing and already configured SMB server, and supports dynamic provisioning of Persistent Volumes via Persistent Volume Claims by creating a new sub directory under the SMB server.

  • This script automates the configuration of SELinux settings on Worker nodes, the installation of the SMB CSI Driver, and the setup of the SMB storage in a Kubernetes cluster. It ensures that all necessary components and configurations are applied correctly for integrating SMB storage.

  • From the root of the repository, run the script on the Login node:

    bash ./scripts/smb.sh

  • Optional environment variables:

    Option Description Sample Default
    SERVICE_USER The username of the service user account. myuser -
    SUDO_PASSWD The sudo password of the service user account. mypassword -
    SSH_PORT The SSH port used on the Kubernetes nodes. 2200 22
    SMB_USER The username of the SMB user account. mysmbuser -
    SMB_PASSWD The password of the SMB user account. mysmbpassword -

Helper scripts

These helper scripts are not necessarily required for installing and setting up the Kubernetes cluster, but may be helpful in certain situations such as helping you meet Orked's prerequisites. Use them as you see fit.

Update connection

Tip

It is recommended to use this script first and foremost in order to ensure that each node has been configured with a static IPv4 addres and a unique hostname.

  • This script configures the network settings on the node it runs on, specifically focusing on setting a static IPv4 address and updating the node's local hostname.

  • From the root of the repository, run the script on each node:

    bash ./helpers/update-connection.sh

  • Optional environment variables:

    Option Description Sample Default
    SUDO_PASSWD The sudo password of the service user account. mypassword -
    IFCFG_INTERFACE The name of the network interface. ens192 -
    IFCFG_IPADDR The intended static IPv4 address of the node. 192.168.1.10 -
    IFCFG_GATEWAY The default gateway IP address. 192.168.1.1 -
    IFCFG_DNS1 The primary DNS server IP address. 8.8.8.8 1.1.1.1
    IFCFG_DNS2 The secondary DNS server IP address. 8.8.4.4 8.8.8.8
    NODE_HOSTNAME The intended hostname of the node. rke2-master-01.example.com -

    Please refer to the content of the script for the full list of supported environment variables.

Toggle SELinux

Tip

SELinux is enabled by default on Rocky Linux. In cases where you have disabled it to perform certain operations that do not support it, it is highly recommended for you to re-enable it after.

  • Security-Enhanced Linux (SELinux) is a security architecture for Linux systems that allows administrators to have more control over who can access the system. It was originally developed by the United States National Security Agency (NSA) as a series of patches to the Linux kernel using Linux Security Modules (LSM).

  • This script toggles the SELinux enforcement status on Worker nodes, which may be needed in some cases.

  • From the root of the repository, run the script on the Login node:

    bash ./helpers/selinux-toggle.sh

  • Optional environment variables:

    Option Description Sample Default
    SERVICE_USER The username of the service user account. myuser -
    SUDO_PASSWD The sudo password of the service user account. mypassword -
    SSH_PORT The SSH port used on the Kubernetes nodes. 2200 22

Additional resources

Adding environment variables

  1. To supply environment variable values to a script, simply prepend the command to run the script with the environment variable name and its value:

    ENV_VAR_NAME=ENV_VAR_VALUE bash <script>

    [!NOTE]
    Supply as many ENV_VAR_NAME and ENV_VAR_VALUE pairs as you need and replace <script> with the actual path to the script.

  2. Alternatively, instead of setting environment variables individually on a per-script basis, you can set them globally (to your Orked repository) by using an .env file:

    At the root of the Orked repository, create an .env file:

    nano ./.env

    Add in your environment variable name and value pairs to the file, separated by newlines for each pair like so:

    ENV_VAR_NAME=ENV_VAR_VALUE

    Now when you run any of the installer or helper scripts as is, environment variable values will be sourced accordingly from the .env file you have provided.

Joining additional nodes to an existing cluster

Note

This guide assumes that you have an existing preconfigured Login node for your Kubernetes cluster set up.

Prepare the additional nodes joining the cluster as you have done for the existing nodes:

  1. Update the network settings on each additional node including setting a static IPv4 address and updating the node's local hostname.

  2. Set up the Login node for passwordless SSH access to all the additional nodes in the cluster.

  3. Update the hostname entries on all nodes in the cluster so that they have the necessary name resolution between them.

  4. Configure the additional nodes by setting up networking, disabling unnecessary services and functionalities, and performing several other best practice configurations.

Once the additional nodes have been prepped and configured, you can proceed to join them to the cluster:

  1. Install and configure RKE2 on all nodes. This will perform all the necessary steps to set up a fully functional RKE2 cluster including joining the additional nodes to the cluster.

  2. If the additional nodes include Worker nodes, install and configure Longhorn on the additional Worker nodes, and set up their dedicated virtual disk for Longhorn storage.

  3. If you require SMB storage and the additional nodes include Worker nodes, install and configure SMB on the additional Worker nodes.

Finally, verify that the additional nodes have joined the cluster successfully:

kubectl get nodes -o wide

About

O-tomated RKE Distribution (Orked) is a collection of scripts that aims to easily and reliably set up a production-ready Kubernetes cluster based on RKE2, with Longhorn storage, that is highly performant and efficient.

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kubernetes kubernetes-cluster rke2

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