A Kubernetes cluster is not currently running Cilium as a CNI, but the user would like to benefit from Hubbies observability capabilities on your cluster. Which one of the following options is NOT possible?
A.
Migrating to Cilium and Hubble by reconfiguring /etc/cni/net .6/ to point to Cilium and restarting the nodes, accepting an outage.
B.
Install Hubble on the cluster without Cilium. Hubble can be deployed in a standalone model by downloading and installing the Hubble binary
C.
Install Cilium and Hubble on top of the cluster in a CNI chaining model, without disrupting the existing CNI.
D.
Migrating to Cilium and Hubble on a node-by-node basis, without requiring a complete cluster outage, by using Dual Overlays.
Hubble is Cilium’s integrated observability layer and consumes flow events produced by Cilium’s eBPF datapath and embedded Hubble servers. The Hubble CLI is only a client; downloading its binary does not install a standalone datapath or create flow data on a cluster that lacks Cilium. Option B is therefore the operation that is not possible.
The other approaches represent recognized Cilium deployment or migration models. A direct migration can replace the CNI configuration and recycle workloads or nodes, although a naive cluster-wide transition can disrupt connectivity. CNI chaining allows Cilium to operate with another CNI: the existing plugin continues to provide basic connectivity and IP address management, while Cilium attaches eBPF programs to the created interfaces to provide visibility, policy, and other functions. Cilium also documents migration through dual overlays. In that model, the old and new networks coexist temporarily, nodes are moved in a controlled sequence, and workloads attached to either overlay retain connectivity when the documented addressing and routing requirements are met.
The supplied bank incorrectly marks A. The verified answer is B because Hubble requires Cilium-managed observability data.
Official references
Setting up Hubble Observability ; CNI Chaining ; Migrating a cluster to Cilium .
Study Guide topic: Installation and Configuration.
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