IP Address Management (IPAM)¶

Pods¶

In Kubernetes, the CNI (Container Network Interface) plugin/driver is responsible for assigning IP addresses to pods. So read your network plugin documentation to know the different options and settings it has.

When a pod is created, the Kubelet on the node asks the configured CNI plugin to set up networking for the pod.

Kubelet cluster mode¶

In kubelet cluster mode it is possible to enable and specify the global cidr range using the following settings:

kube controller manager configuration file

AllocateNodeCIDRs: true
ClusterCIDR

kube controller manager parameter

--allocate-node-cidrs=true
--cluster-cidr

The default cilium IPAM mode "Cluster Scope" ignores this setting and uses ipam.operator.clusterPoolIPv4PodCIDRList (default 10.0.0.0/8)

Kubelet standalone mode¶

If we have an standalone kubelet nodes, it is possible to configure the pod cidr range using the following setting:

podCIDR # kubelet configuration file
--pod-cidr # kubelet parameter

Services¶

The kube-apiserver is configured to assign IP addresses to Services.

pending

Nodes¶

pending