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Microk8s calico-kube-controller not running, Failed to initialize Calico datastore error... 解决方法

运行环境

Rocky Linux 9

问题描述

microk8s calico-kube-controller pod运行失败, 报错:Failed to initialize Calico datastore error=Get “https://10.152.183.1:443/apis/crd.projectcalico.org/v1/clusterinformations/default”: context deadline exceeded

原因分析

  • Rocky Linux 9 iptables版本是1.8,基于nft而不是legacy。而calico插件默认使用legacy版本,导致cali-INPUT链没有生成
  • 如果用户在INPUT链自定义了DROP/REJECT规则, 同时cali-INPUT链没有生成,可能会导致k8s内部流量被丢弃,出现calico-kube-controller通过http连接apiserver超时报错.

解决方法

在calico-node中添加环境变量FELIX_IPTABLESBACKEND

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env:
- name: FELIX_IPTABLESBACKEND
value: NFT

具体操作如下:

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microk8s kubectl delete -f /var/snap/microk8s/current/args/cni-network/cni.yaml
microk8s stop
microk8s start

Edit /var/snap/microk8s/current/args/cni-network/cni.yaml
env:
- name: FELIX_IPTABLESBACKEND
value: NFT
microk8s kubectl apply -f /var/snap/microk8s/current/args/cni-network/cni.yaml

参考资料

https://microk8s.io/docs/change-cidr
https://zhuanlan.zhihu.com/p/590101932