Comments (6)
在腾讯云机器上部署可能会存在这样的任务。主要是kube-system命名空间下的core-dns不正常。可能的原因
1、主机上53端口占用,比如主机携带bind服务,会占用了53端口,造成coredns无法启动。需要关注主机本身的dns服务
2、主机域名服务器中有127.0.0.1,无法启动。修正主机/etc/resolv.conf
目录下的dns服务器配置,并重启 docker restart kubelet
3、coredns的资源limit太小,可以把resource limit去掉
4、防火墙限制,虽然在云上有安全组限制,但是在主机上可能还有一层防火墙的限制。iptables 放开dns。/sbin/iptables -P FORWARD ACCEPT
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虽然在云上有安全组限制,但是在主机上可能还有一层防火墙的限制。iptables
多谢@data-infra回复
我的部署不在腾讯云,是我司内部的一个云主机。
这个应该和core-dns没关系,core-dns启动正常,core-dns只影响service。但我验证了直接对同一个namespace的两个pod都ping不通
如下图,我进入了volcano-admission-85b7ccb489-cztl2这个pod 去ping 10.42.119.73 是不通的
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rancher k8s使用的是nat网络模式,本身就无法响应ping命令。只能通过ping服务名看看能不能解析出服务名的ip。不会有ping响应。
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试试 /sbin/iptables -P FORWARD ACCEPT
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是这个原因,多谢@data-infra
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