A Service IP CIDR is the address range from which cluster IP addresses are allocated to Kubernetes Services. Each ClusterIP Service requires one address from this range. section 10.2.2
Cluster networking separates address allocation into three ranges:
- Node IPs are assigned to cluster nodes through the primary subnet. section 10.2.2
- Pod IP CIDRs provide addresses for Pods running inside the cluster. section 10.2.2
- The Service IP CIDR provides cluster IP addresses for Services. section 10.2.2
Selecting a subnet mask
A requirement for 129–256 cluster IP addresses corresponds to a /24 subnet mask. section 10.2.2
Use the subnet-sizing table to map the required number of cluster IP addresses to a Service CIDR mask. section 10.2.2
