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Uber Kubernetes

What is this?

This is the code repo where our friend group manages some shared infra. What we define here is pushed to the cluster by ArgoCD

Architecture

All the nodes are meshed together using Wireguard, Tailscale and Headscale.

This way the Kube-api and ETCD containers always have a stable way of reaching each other.

Internal load balancing of the Kube-api happens using a static pod running haproxy.

All the used DNS records point/CNAME to kubernetes.oscarr.nl

And the records under that subdomain are automatically managed by a script that runs every 5 minutes as a Kubernetes cronjob.

Traefik runs as a DaemonSet on all locations and internal Kubernetes networking is handled by Cilium.

graph

Users[End users]-- DNS magic --> T1 & T2 & T3 & T4

subgraph Site1[Houten]
    subgraph k8s-1
        T1[Traefik] --> C1[Container X]
    end
end

subgraph Site2[Ede 1]
    subgraph k8s-2
        T2[Traefik]  --> C1
    end
end

subgraph Site3[Ede 2]
    subgraph k8s-3
        T3[Traefik] --> C1
    end
end

subgraph Site4[Veenendaal]
    subgraph k8s-4
        T4[Traefik] --> C1
    end
end

k8s-1 & k8s-2 & k8s-3 & k8s-4 -- Mesh VPN key exchange --- VPN[headscale.oscarr.nl]
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Connecting to the cluster

How to connect to the cluster is described here