DNS pods fail afrer kubeadm init

Question

我正在运行kubeadm init --pod-network-cidr=10.244.0.0/16来部署k8s。之后，我正在运行kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml来安装法兰绒吊舱网络。 紧接着，我有核心dns pods并运行，但日志说：

[INFO] plugin/reload: Running configuration MD5 = 4e235fcc3696966e76816bcd9034ebc7
CoreDNS-1.6.5
linux/amd64, go1.13.4, c2fd1b2
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:60266->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:40761->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:50495->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:41244->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:37152->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:35273->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:36979->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:56856->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:59105->172.20.0.1:53: i/o timeout
[ERROR] plugin/errors: 2 2304295940078007789.7023563928002468477. HINFO: read udp 10.244.1.3:42423->172.20.0.1:53: i/o timeout

我做错了什么？ 我该如何纠正它？

Answer 1

核心 dns pod 完全取决于网络插件，在您的情况下是法兰绒。如果法兰绒有任何问题，dns pod 将无法正常启动。尝试通过执行以下命令来安装最新版本的法兰绒，如法兰绒 githubReadMe.md中所述。

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml