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GCP-Network

Imported from Confluence

Content may be outdated. Verify before following any procedures. View original | Last updated: November 2022

Reserved CIDR Blocks:

Please use reserved block from this 👆 google sheet!

Recommendation for choosing range and the size of subnets use this:

  1. Primary Subnet Ranges can be expanded as needed, but never shrunk (they would need to be recreated)
  2. Secondary Subnet Ranges are hard-set and would need to be recreated if any changes are required
  3. TheControl PlaneCIDR can overlap between VPC but NOT within a VPC. To help reserve the right number of CIDRs, ask: What’s the maximum number of clusters that will exist in a VPC? and reserve (On an IPAM DB or Spreadsheet) that number of/28addresses for that VPC.

  4. GKE Clusters on the same Primary Subnet, can use the same Secondary Pod IPs, but NOT Secondary Service IPs; it would have to be unique.

  5. GKE Cluster IP Reservation strategy can be found here:

  6. How many IPs are used per node?

  7. How many Nodes can exist within a CIDR?
  8. How to choose the right Subnet(s) for Pods?
  9. How to choose the right Subnet(s) for Services?