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kubespray/docs/centos.md

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CentOS and derivatives

CentOS 7

The maximum python version offically supported in CentOS is 3.6. Ansible as of version 5 (ansible core 2.12.x) increased their python requirement to python 3.8 and above. Kubespray supports multiple ansible versions but only the default (5.x) gets wide testing coverage. If your deployment host is CentOS 7 it is recommended to use one of the earlier versions still supported.

CentOS 8

CentOS 8 / Oracle Linux 8 / AlmaLinux 8 / Rocky Linux 8 ship only with iptables-nft (ie without iptables-legacy similar to RHEL8) The only tested configuration for now is using Calico CNI You need to add calico_iptables_backend: "NFT" or calico_iptables_backend: "Auto" to your configuration.

If you have containers that are using iptables in the host network namespace (hostNetwork=true), you need to ensure they are using iptables-nft. An example how k8s do the autodetection can be found in this PR