snippets for k3s

Install k3s

https://k3s.io/:

curl -sfL https://get.k3s.io | sh -

Disable traeffic-ingress:

edit /etc/systemd/system/k3s.service:

[...]
ExecStart=/usr/local/bin/k3s \
    server --disable traefik \
[...]

finally systemctl daemon-reload and systemctl restart k3s

Enable nginx-ingress

Installation

https://kubernetes.github.io/ingress-nginx/deploy/#bare-metal

Switch ingress-Service from NodePort to LoadBalancer

kubectl edit service -n ingress-nginx and change type: NodePort to type: LoadBalancer

Port 80 and 443 should listen now on an External-IP kubectl get all --all-namespaces:

[...]
NAMESPACE       NAME                                         TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)                      AGE
[...]
ingress-nginx   service/ingress-nginx-controller-admission   ClusterIP      10.43.174.128   <none>         443/TCP                      35m
ingress-nginx   service/ingress-nginx-controller             LoadBalancer   10.43.237.255   10.62.94.246   80:30312/TCP,443:30366/TCP   35m
[...]

Test: curl -s http://<External-IP> should return well known nginx-404-page:

dominik@muggler:~$ curl -s http://10.62.94.246
<html>
<head><title>404 Not Found</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.19.1</center>
</body>
</html>

Enable nginx-ingress tcp- and udp-services for apps other than http/s

kubectl edit deployment -n ingress-nginx and search for spec:/template/spec/containers section:

[...]
spec:                                                                                  
[...]                                                                  
  template:                                                                            
    metadata:                                  
      creationTimestamp: null                  
      labels:                                  
        app.kubernetes.io/component: controller                 
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx    
    spec:                                        
      containers:                                
      - args:                                    
        - /nginx-ingress-controller              
        - --election-id=ingress-controller-leader
        - --ingress-class=nginx                  
        - --configmap=ingress-nginx/ingress-nginx-controller
        - --validating-webhook=:8443                        
        - --validating-webhook-certificate=/usr/local/certificates/cert
        - --validating-webhook-key=/usr/local/certificates/key
        *** ADD >>> - --tcp-services-configmap=ingress-nginx/tcp-services <<< ADD ***
        *** ADD >>> - --udp-services-configmap=ingress-nginx/udp-services <<< ADD ***
        env:     
[...]

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