Unlike a DHCP server maintaining it remotely. The type host-local indicates that the IP addresses are managed locally on this host. The main purpose behind CNI is to provide enough control to administrators for monitoring the communication while reducing the overhead to generate network configurations manually. CNI, which stands for a container network interface, is one of those projects which supports plugin-based functionality to simplify networking in Kubernetes. This is where you specify the subnet or the range of IP addresses that will be assigned to PODs and any necessary routes. Many projects have sprung up in the Kubernetes ecosystem, making communication between containers easy, consistent and secure. The IPAM section defines IPAM configuration. The IP masquerade defines if a NAT rule should be added for IP masquerading. The is Gateway defines whether the bridge network interface should get an IP address assigned so it can act as a gateway. It also has a set of other configurations which can be related to the concepts we discussed in the previous tutorials on bridging, routing and masquerading in NAT. As such it will probably showcase the CNI abstraction in a different light. But it’s nice little deep dive into kubernetes networking. It’s much more likely that you will simply provision a fresh cluster and retire the old one. If you look at the kubelet service file, you will see an option called network-plugin set to CNI. This is not a common task in daily kubernetes administration.
The CNI plugin is configured in the kubelet service on each node in the cluster. Because that component must then invoke the appropriate network plugin after the container is created. It is a plugin which we can install, and it also helps us to achieve high availability and throughput, minimal network jitter and low latency etc. So where do we specify the CNI plugins for Kubernetes to use? The CNI plugin must be invoked by the component within Kubernetes that is responsible for creating containers. Kubernetes uses cni to enable the networking, here CNI stands for container Network Interface. As we discussed in the previous tutorials, CNI defines the responsibilities of container runtime.Īs per CNI, container runtimes, in our case Kubernetes, is responsible for creating container network namespaces, identifying and attaching those namespaces to the right network by calling the right network plugin.
So, in this tutorial we will see how Kubernetes is configured to use these network plugins. In the previous tutorials, we started all the way from the absolute basics of network namespaces, then we saw how it is done in Docker, we then discussed why you need standards for networking containers and how the container network interface came to be and then we saw a list of supported plugins available with CNI.
#What is kubernetes cni install#
Install Calico on a single-host Kubernetes cluster for testing or development in under 15 minutes.
#What is kubernetes cni how to#
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