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The operation of the Kuma data plane proxy, precludes that all the relevant inbound and outbound traffic on the host (or container) that runs the service is diverted to pass through the proxy itself. This is done through transparent proxying, which is set up automatically on Kubernetes. Installing it requires certain privileges, which are delegated to pre-sidecar initialisation steps. There are two options to do this with Kuma:
- use the standard
kuma-init, which is the default
- use the Kuma CNI
Kuma CNI can be leveraged in the two installation methods for Kubernetes: using
kumactl and with Helm. The default settings are tuned for OpenShift with Multus, therefore to use it in other environments we need to set the relevant configuration parameters.
Below are the details of how to set-up each of the options, considering and example where a plain Kubernetes cluster deployed with
kubeadm and the default Calico CNI is used.