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Ipv4 address exhaustion

As explained in Google Anthos in Action

IP exhaustion is the condition in which an address pool no longer contains enough available IP addresses for required resources.

IP exhaustion occurs when an address pool cannot provide enough addresses for required resources. In Anthos GKE, the risk depends on network mode: island-mode clusters can reuse an address schema, while VPC-native clusters require nonoverlapping ranges and unique subnets. section 10.2.2

Plan separate address capacity for:

  • Nodes: size the pool from the number of clusters and maximum nodes per cluster. section 10.2.2
  • Pods: allocate a Pod IP CIDR and divide it into per-node subnets; a /16 can provide /24 ranges to nodes. section 10.2.2
  • Services: reserve Service IP CIDR capacity because each ClusterIP Service requires one address. section 10.2.2

How Google Anthos in Action covers it

How deep it goes
Explains node, Pod, and Service pools with CIDR examples, but stops short of a complete deployment procedure.
Examples
Uses a /16 Pod CIDR divided into /24 node ranges and calculates node capacity from cluster count and maximum nodes.
What it assumes
Assumes familiarity with Anthos clusters, GCE nodes, Pods, Services, VPCs, subnets, and CIDR notation.
What you can do after
Evaluate required node, Pod, and Service address capacity before deploying VPC-native Anthos GKE clusters.
How it connects
Connects IP exhaustion to Anthos GKE, island mode, VPC-native mode, Pods, Services, CIDR blocks, and subnets.
Cover of Google Anthos in Action
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