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⛵ Cluster Template

Welcome to my opinionated and extensible template for deploying a single Kubernetes cluster. The goal of this project is to make it easier for people interested in using Kubernetes to deploy a cluster at home on bare-metal or VMs. This template closely mirrors my personal home-ops repository.

At a high level this project makes use of makejinja to read in a configuration file which renders out templates that will allow you to install and manage your Kubernetes cluster with.

✨ Features

The features included will depend on the type of configuration you want to use. There are currently 2 different types of configurations available with this template.

  1. "Flux cluster" - a Kubernetes cluster deployed on-top of Talos Linux with an opinionated implementation of Flux using GitHub as the Git provider and sops to manage secrets.

  2. "Flux cluster with Cloudflare" - An addition to "Flux cluster" that provides DNS and SSL with Cloudflare. Cloudflare Tunnel is also included to provide external access to certain applications deployed in your cluster.

Other features include:

💻 Machine Preparation

System requirements

[!NOTE]

  1. The included behaviour of Talos is that all nodes are able to run workloads, including the controller nodes. Worker nodes are therefore optional.
  2. Do you have 3 or more nodes? It is highly recommended to make 3 of them controller nodes for a highly available control plane.
  3. Running the cluster on Proxmox VE? My thoughts and recommendations about that are documented here.
RoleCoresMemorySystem Disk
Control4 (6*)8GB (24GB*)120GB (500GB*) SSD/NVMe
Worker4 (6*)8GB (24GB*)120GB (500GB*) SSD/NVMe
* recommended

  1. Head over to the Talos Linux Image Factory and follow the instructions. Be sure to only choose the bare-minimum system extensions as some might require additional configuration and prevent Talos from booting without it. You can always add system extensions after Talos is installed and working.

  2. This will eventually lead you to download a Talos Linux iso file (or for SBCs the .raw.xz). Make sure to note the schematic ID you will need this later on.

  3. Flash the iso or raw file to a USB drive and boot to Talos on your nodes with it.

🚀 Getting Started

Once you have installed Talos on your nodes, there are six stages to getting a Flux-managed cluster up and running.

[!NOTE] For all stages below the commands MUST be ran on your personal workstation within your repository directory

🎉 Stage 1: Create a Git repository

  1. Create a new public repository by clicking the big green "Use this template" button at the top of this page.

  2. Use git clone to download the repo you just created to your local workstation and cd into it.

🌱 Stage 2: Setup your local workstation

  1. Install and activate mise following the instructions for your workstation here.

  2. Use mise to install the required CLI tools.

    mise trust
mise install

  3. Use mise to install the required Python dependencies.

    mise run install

🔧 Stage 3: Bootstrap configuration

[!NOTE] The config.sample.yaml file contains config that is vital to the bootstrap process.

  1. Generate the config.yaml from the config.sample.yaml configuration file.

    📍 If the below command fails mise is either not install or configured incorrectly.

    task init

  2. Fill out the config.yaml configuration file using the comments in that file as a guide.

  3. Run the following command which will generate all the files needed to continue.

    task configure

  4. Push you changes to git

    📍 Verify all the ./kubernetes/**/*.sops.* files are encrypted with SOPS

    git add -A
git commit -m "Initial commit :rocket:"
git push

⛵ Stage 4: Install Kubernetes

  1. Deploy your cluster and bootstrap it. This generates secrets, generates the config files for your nodes and applies them. It bootstraps the cluster afterwards, fetches the kubeconfig file and installs Cilium and kubelet-csr-approver. It finishes with some health checks.

    task bootstrap:talos

  2. ⚠️ It might take a while for the cluster to be setup (10+ minutes is normal), during which time you will see a variety of error messages like: "couldn't get current server API group list," "error: no matching resources found", etc. This is a normal. If this step gets interrupted, e.g. by pressing <kbd>Ctrl</kbd> + <kbd>C</kbd>, you likely will need to reset the cluster before trying again.

Cluster validation

  1. The kubeconfig for interacting with your cluster should have been created in the root of your repository.

  2. Verify the nodes are online

    kubectl get nodes -o wide
# NAME           STATUS   ROLES                       AGE     VERSION
# k8s-0          Ready    control-plane,etcd,master   1h      v1.30.1
# k8s-1          Ready    worker                      1h      v1.30.1

🔹 Stage 6: Install Flux in your cluster

  1. Verify Flux can be installed

    flux check --pre
# ► checking prerequisites
# ✔ kubectl 1.30.1 >=1.18.0-0
# ✔ Kubernetes 1.30.1 >=1.16.0-0
# ✔ prerequisites checks passed

  2. Install Flux and sync the cluster to the Git repository

    task bootstrap:flux
# namespace/flux-system configured
# customresourcedefinition.apiextensions.k8s.io/alerts.notification.toolkit.fluxcd.io created
# ...

  3. Verify Flux components are running in the cluster

    kubectl -n flux-system get pods -o wide
# NAME                                       READY   STATUS    RESTARTS   AGE
# helm-controller-5bbd94c75-89sb4            1/1     Running   0          1h
# kustomize-controller-7b67b6b77d-nqc67      1/1     Running   0          1h
# notification-controller-7c46575844-k4bvr   1/1     Running   0          1h
# source-controller-7d6875bcb4-zqw9f         1/1     Running   0          1h

🎤 Verification Steps

Mic check, 1, 2 - In a few moments applications should be lighting up like Christmas in July 🎄

  1. Output all the common resources in your cluster.

    📍 Feel free to use the provided kubernetes tasks for validation of cluster resources or continue to get familiar with the kubectl and flux CLI tools.

    task kubernetes:resources

  2. ⚠️ It might take cert-manager awhile to generate certificates, this is normal so be patient.

  3. 🏆 Congratulations if all goes smooth you will have a Kubernetes cluster managed by Flux and your Git repository is driving the state of your cluster.

  4. 🧠 Now it's time to pause and go get some motel motor oil ☕ and admire you made it this far!

📣 Flux w/ Cloudflare post installation

🌐 Public DNS

📍 Use the external ingress class to make applications public to the internet

The external-dns application created in the networking namespace will handle creating public DNS records. By default, echo-server and the flux-webhook are the only subdomains reachable from the public internet. In order to make additional applications public you must set set the correct ingress class name and ingress annotations like in the HelmRelease for echo-server.

🏠 Home DNS

📍 Use the internal ingress class to make applications private to your network

k8s_gateway will provide DNS resolution to external Kubernetes resources (i.e. points of entry to the cluster) from any device that uses your home DNS server. For this to work, your home DNS server must be configured to forward DNS queries for ${bootstrap_cloudflare.domain} to ${bootstrap_cloudflare.gateway_vip} instead of the upstream DNS server(s) it normally uses. This is a form of split DNS (aka split-horizon DNS / conditional forwarding).

[!TIP] Below is how to configure a Pi-hole for split DNS. Other platforms should be similar.

  1. Apply this file on the Pihole server while substituting the variables
# /etc/dnsmasq.d/99-k8s-gateway-forward.conf
server=/${bootstrap_cloudflare.domain}/${bootstrap_cloudflare.gateway_vip}
  1. Restart dnsmasq on the server.
  2. Query an internal-only subdomain from your workstation (any internal class ingresses): dig @${home-dns-server-ip} echo-server-internal.${bootstrap_cloudflare.domain}. It should resolve to ${bootstrap_cloudflare.ingress_vip}.

If you're having trouble with DNS be sure to check out these two GitHub discussions: Internal DNS and Pod DNS resolution broken.

... Nothing working? That is expected, this is DNS after all!

📜 Certificates

By default this template will deploy a wildcard certificate using the Let's Encrypt staging environment, which prevents you from getting rate-limited by the Let's Encrypt production servers if your cluster doesn't deploy properly (for example due to a misconfiguration). Once you are sure you will keep the cluster up for more than a few hours be sure to switch to the production servers as outlined in config.yaml.

📍 You will need a production certificate to reach internet-exposed applications through cloudflared.

🪝 Github Webhook

By default Flux will periodically check your git repository for changes. In order to have Flux reconcile on git push you must configure Github to send push events to Flux.

[!NOTE] This will only work after you have switched over certificates to the Let's Encrypt Production servers.

  1. Obtain the webhook path

    📍 Hook id and path should look like /hook/12ebd1e363c641dc3c2e430ecf3cee2b3c7a5ac9e1234506f6f5f3ce1230e123

    kubectl -n flux-system get receiver github-receiver -o jsonpath='{.status.webhookPath}'

  2. Piece together the full URL with the webhook path appended

    https://flux-webhook.${bootstrap_cloudflare.domain}/hook/12ebd1e363c641dc3c2e430ecf3cee2b3c7a5ac9e1234506f6f5f3ce1230e123

  3. Navigate to the settings of your repository on Github, under "Settings/Webhooks" press the "Add webhook" button. Fill in the webhook URL and your bootstrap_github_webhook_token secret in config.yaml, Content type: application/json, Events: Choose Just the push event, and save.

💥 Reset

There might be a situation where you want to destroy your Kubernetes cluster. The following command will reset your nodes back to maintenance mode, append --force to completely format your the Talos installation. Either way the nodes should reboot after the command has run.

task talos:reset # --force

🛠️ Talos and Kubernetes Maintenance

⚙️ Updating Talos node configuration

📍 Ensure you have updated talconfig.yaml and any patches with your updated configuration.

# (Re)generate the Talos config
task talos:generate-config
# Apply the config to the node
task talos:apply-node HOSTNAME=? MODE=?
# e.g. task talos:apply-config HOSTNAME=k8s-0 MODE=auto

⬆️ Updating Talos and Kubernetes versions

📍 Ensure the talosVersion and kubernetesVersion in talhelper.yaml are up-to-date with the version you wish to upgrade to.

# Upgrade node to a newer Talos version
task talos:upgrade-node HOSTNAME=?
# e.g. task talos:upgrade HOSTNAME=k8s-0

# Upgrade cluster to a newer Kubernetes version
task talos:upgrade-k8s
# e.g. task talos:upgrade-k8s

🤖 Renovate

Renovate is a tool that automates dependency management. It is designed to scan your repository around the clock and open PRs for out-of-date dependencies it finds. Common dependencies it can discover are Helm charts, container images, GitHub Actions, Ansible roles... even Flux itself! Merging a PR will cause Flux to apply the update to your cluster.

To enable Renovate, click the 'Configure' button over at their Github app page and select your repository. Renovate creates a "Dependency Dashboard" as an issue in your repository, giving an overview of the status of all updates. The dashboard has interactive checkboxes that let you do things like advance scheduling or reattempt update PRs you closed without merging.

The base Renovate configuration in your repository can be viewed at .github/renovate.json5. By default it is scheduled to be active with PRs every weekend, but you can change the schedule to anything you want, or remove it if you want Renovate to open PRs right away.

🐛 Debugging

Below is a general guide on trying to debug an issue with an resource or application. For example, if a workload/resource is not showing up or a pod has started but in a CrashLoopBackOff or Pending state.

  1. Start by checking all Flux Kustomizations & Git Repository & OCI Repository and verify they are healthy.

    flux get sources oci -A
flux get sources git -A
flux get ks -A

  2. Then check all the Flux Helm Releases and verify they are healthy.

    flux get hr -A

  3. Then check the if the pod is present.

    kubectl -n <namespace> get pods -o wide

  4. Then check the logs of the pod if its there.

    kubectl -n <namespace> logs <pod-name> -f
# or
stern -n <namespace> <fuzzy-name>

  5. If a resource exists try to describe it to see what problems it might have.

    kubectl -n <namespace> describe <resource> <name>

  6. Check the namespace events

    kubectl -n <namespace> get events --sort-by='.metadata.creationTimestamp'

Resolving problems that you have could take some tweaking of your YAML manifests in order to get things working, other times it could be a external factor like permissions on NFS. If you are unable to figure out your problem see the help section below.

👉 Help

❔ What's next

The cluster is your oyster (or something like that). Below are some optional considerations you might want to review.

Ship it

To browse or get ideas on applications people are running, community member @whazor created Kubesearch as a creative way to search Flux HelmReleases across Github and Gitlab.

DNS

Instead of using k8s_gateway to provide DNS for your applications you might want to check out external-dns, it has wide support for many different providers such as Pi-hole, UniFi, Adguard Home, Bind and more.

Storage

The included CSI (openebs in local-hostpath mode) is a great start for storage but soon you might find you need more features like replicated block storage, or to connect to a NFS/SMB/iSCSI server. If you need any of those features be sure to check out the projects like rook-ceph, longhorn, openebs, democratic-csi, csi-driver-nfs, and synology-csi.

🙌 Related Projects

If this repo is too hot to handle or too cold to hold check out these following projects.

⭐ Stargazers

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🤝 Thanks

Big shout out to all the contributors, sponsors and everyone else who has helped on this project.