亲测v1.8.5，部署完后三节点状态都是ready，但kubectl get pods --all-namespaces现实kube-dns状态停留在 ContainerCreating，journalctl -u kubelet | grep kube-dns看到“ Error deleting network: failed to find plugin "portmap" in path [/opt/flannel/bin /opt/cni/bin]”，解决办法到https://github.com/projectcalico/cni-plugin/releases/download/v1.9.1/portmap下载portmap并放到/opt/cni/bin,加上可执行权限。。。。。。。大坑啊
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按照你说的方法搞定了。。帮了大忙了，我都没发现这个问题
或者disable portmap。具体看这个解决办法
https://github.com/coreos/flannel/issues/890
用下面这个版本安装 flannel
https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml