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General networking

The Zylon Kubernetes cluster is built on k0s, which uses Calico as its default CNI (Container Network Interface). For a complete list of ports that must be open in your firewall, please refer to the official k0s documentation: https://docs.k0sproject.io/latest/networking/

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Configure a proxy for the kubernetes cluster

If your system operates within a local network that requires a proxy for internet access, you must configure the proxy settings in the systemd service running the Kubernetes cluster. In addition to setting the proxy variables in the /etc/environment file, create a drop-in configuration file for the k0scontroller service at: /etc/systemd/system/k0scontroller.service.d/proxy.conf 
[Service]
Environment="HTTP_PROXY=..."
Environment="HTTPS_PROXY=..."
Environment="NO_PROXY=..."
After saving your changes, reload the systemd configuration and restart the k0scontroller service: 
sudo systemctl daemon-reload
sudo systemctl restart k0scontroller