ServiceCIDR
ServiceCIDR is a Kubernetes resource specifying IP address ranges from which Service cluster IP addresses are allocated.
Acing the Certified Kubernetes Administrator Exam, Second Edition
A ServiceCIDR is a Kubernetes resource that represents one or more IP address ranges allocated to Services.
- How it is used
- Uses virtual IP ranges to allocate and route ClusterIP Services within a Kubernetes cluster.
- How deep it goes
- Explains ranges, finalizers, allocation, kube-proxy routing, and a complete reconfiguration workflow, but not allocator internals.
- Examples
- Demonstrates changing 10.96.0.0/16 to 100.96.0.0/16 and validating built-in Services, kubelet DNS, and nslookup.
- What you can do after
- Operate/configure a Service CIDR and verify Service IP allocation and in-cluster DNS after reconfiguration.
Read how Acing the Certified Kubernetes Administrator Exam, Second Edition explains ServiceCIDR →
Google Anthos in Action
A Service IP CIDR is the address range from which cluster IP addresses are allocated to Kubernetes Services.
- How it is used
- Allocates cluster IP addresses to Kubernetes Services, with one address required for each ClusterIP Service.
- How deep it goes
- Defines the address range and provides subnet-mask sizing by cluster IP count, without detailing allocation internals.
- Examples
- Uses a subnet-sizing table mapping 129–256 cluster IP addresses to a /24 mask.
- What you can do after
- Apply CIDR sizing tables to select a subnet mask for the required cluster IP address capacity.
Related concepts
- Kubernetes resourcekind of · A Kubernetes resource is a persistent API-managed object representing the desired or observed state of a workload, configuration, or other cluster entity.
- serviceuses · A Kubernetes Service is an API resource that provides stable network access and service discovery for a changing set of Pods or other specified destinations.
- kubernetes api serverconfigured by · The Kubernetes API server is the control-plane component that exposes, validates, and processes the Kubernetes API for managing cluster resources and state.
- clusterip service typeconfigures · ClusterIP is a Kubernetes Service type that exposes selected Pods through a stable virtual IP address accessible only within the cluster.
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