For someĬompanies this might be unacceptable. This of courseĬauses downtime, or at the least, requires a full cluster migration. Replace it, and bring up all workloads again on the new CNI. That the only solution for changing a CNI is to take the entire cluster down, Since the CNI underpins the entire network running on Kubernetes, it would seem Kubernetes at scale, with complex network policy requirements. It is able to utilise the full packet introspection of eBPF, enabling it to haveįor these reasons, Cilium becomes a very favourable choice for running While using Flannel and Calico together is a solid solution, it can haveĪnd may not be as feature rich as other implementations.ĮBPF, and is designed to be run at large scale. Standalone CNI solution or on top of Flannel (called Routing between Pods in the Kubernetes cluster, which is achieved by creating Flannel is solely concerned with setting up Is one such implementation, backed by iptables, and it is perhaps the most There are many implementations of CNI for various use cases, each having their Network policy enforcement, encryption, load balancing, etc. CNIs can also be responsibleįor more advanced features than just setting up routes in the cluster, such as Resources are properly released during deletion. The Kubelet is responsible for calling the CNI installed on the cluster so PodsĪre attached to the Kubernetes cluster network during creation, and its Specifications that define an interface used by container orchestrators to set What is CNI, and why change it?Ĭontainer Network Interface (CNI) is a big topic, but in short, CNI is a set of In this post we'll discuss why one might want to change CNIs, what I have learntĭeveloping a solution for live migration, and how it all works. Josh is working as a Customer Reliability Engineer for Jetstack. To live migrate a cluster running the Canal CNI plugin (Flannel+Calico) toĬilium. Live migration for a customer, Sky Betting and Gaming, This is a guest blog by Josh Van Leeuwen and covers how Josh implemented a CNI
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