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docs: Document some caveats of kube-proxy replacement #13640

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Oct 20, 2020
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docs: Document some caveats of kube-proxy replacement #13640

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docs: Add note about src/dst IP check on cloud for DSR
brb Oct 20, 2020
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docs: Mention about no ClusterIP access from outside cluster
brb Oct 20, 2020
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7 changes: 7 additions & 0 deletions Documentation/gettingstarted/kubeproxy-free.rst
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Expand Up @@ -442,6 +442,10 @@ advised to first check whether the NodePort request actually arrived on the node
containing the backend. If this was not the case, then switching back to the default
SNAT mode would be advised as a workaround.

Also, in some public cloud provider environments, which implement a source /
destination IP address checking (e.g. AWS), the checking has to be disabled in
order for the DSR mode to work.

Above helm example configuration in a kube-proxy-free environment with DSR-only mode
enabled would look as follows:

Expand Down Expand Up @@ -1179,6 +1183,9 @@ Limitations
resources to corresponding ``EndpointSlices`` and thus allowing backing ``Endpoints``
to work. For a more detailed discussion see
`#12438 <https://github.com/cilium/cilium/issues/12438>`__.
* As per `k8s Service <https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types>`__,
Cilium's eBPF kube-proxy replacement disallow access of a ClusterIP service
from outside a cluster.

Further Readings
################
Expand Down