index.md

Kubernetes cluster

Architecture

The Kubernetes cluster at home is a cluster with multiple devices.
See Networks for the home network to which the cluster is connected.

graph TB

%% Definitions
subgraph k8s[Cluster]
    direction LR

    subgraph Distributed["Distributed control planes"]
        direction TB
        Plane1["Control plane1"]
        Plane2["Control plane2"]
        PlaneN["Control planeN"]
    end
    subgraph Nodes
        Node1
        Node2
        NodeN
    end
    
    Storage["Storage"]
end

%% Relations
Distributed --- Node1 & Node2 & NodeN
Plane1 ~~~ Plane2 ~~~ PlaneN
Node1 & Node2 & NodeN --- Storage

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Access from WAN

To access the various applications in the cluster from WAN, use the Cloudflare Tunnel.
The Tunnel enables access from WAN without having to publish the server.
It is also useful because authentication can be set up for access using Tunnel.

graph LR

%% Definitions
Edge[Cloudflare Edge]
subgraph k8s[Cluster]
  cloudflared
  ArgoCD[Argo CD]
  Dashboard[Kuberentes Dashboard]
  Others
end

%% Relations
WAN --> Edge
Edge -..->|Tunnel| cloudflared
cloudflared --> ArgoCD
cloudflared --> Dashboard
cloudflared --> Others

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Setup

Set up the kubernetes cluster

Upgrade

https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/