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Challenge 4: Private IPv4 addresses exhaustion
Flexible Pod CIDR sacrifices pod density for saving IP address.
- Limits the number of pods running per node. Default /24 for up to 110 pods per node
- /25 pods CIDR -> up to 64 pods per node, 128 IPs saved per node
- /26 pods CIDR -> up to 32 pods per node, 192 IPs saved per node
In earlier calculation using /26 pods CIDR it means:
- Max cluster IP usage: 267k -> 70k, a 74% decrease
- Max pods capacity: 110k -> 32k, a 71% decrease
➔ Depending on your use case, you may choose different values, we chose /26 since it fitted our
capacity planning.
Solution: Use Flexible Pod CIDR for GKE clusters