升级 k8s 遭遇 CoreDNS 配置迁移问题

问题:

在将 kubernetes 从 1.17.0 升级至 1.18.0，运行 kubeadm upgrade plan 后出现下面的错误提示：

[preflight] Some fatal errors occurred:
	[ERROR CoreDNSUnsupportedPlugins]: CoreDNS cannot migrate the following plugins:
[Option "answer" in plugin "rewrite" is unsupported by this migration tool in 1.6.5. Option "answer" in plugin "rewrite" is unsupported by this migration tool in 1.6.5.]

请问如何解决？

回答1:

可以通过 ignore-preflight-errors 参数忽略错误

kubeadm upgrade plan --ignore-preflight-errors=CoreDNSUnsupportedPlugins