Networking with Docker and Kubernetes is a lot more complex than with traditional servers and virtual machines. Docker uses network namespaces and virtual interfaces to isolate container networks, while Kubernetes may use iptables rules to provide service routing and is commonly deployed with an overlay network (such as Flannel) in order to support a large IP space without having to reconfigure the existing physical network. Beyond that, you can add in network policies if that isn’t confusing enough.
Jeff Poole offers an overview of the concepts involved and explains what tuning may be required to use Kubernetes successfully. Jeff also covers examples of tracing network traffic through the system and explores special considerations, such as how to determine if you need to adjust the ARP table size on your hosts.
Jeff Poole is a manager of an operations team at Vivint Smart Home, where he works on the backend platform that powers the smart home and security aspects of Vivint’s products. Over his career, he has held a diverse collection of roles and responsibilities, including technical lead in rearchitecting a multi-data-center-hosted VoIP platform and principal engineer designing networking hardware for defense applications. An adrenaline junkie, he has moved from skydiving to working on an ambulance and in an ER to working on production systems.
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