coredns 状态一直处于 containerCreating， 错误日志为 kubernetes failed to set bridge addr: “cni0“ already has an IP address different from
kubectl get pod -A
coredns状态为 containerCreating, 看下日志：
kubectl logs coredns-6d8c4cb4d-6b5k2 -n kube-system
Warning FailedCreatePodSandBox 22m kubelet Failed to create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container “54846981daca512b465b9f45cabfcf4925bc58be8f3e08a403c9f2b16380bf11” network for pod “coredns-6d8c4cb4d-6b5k2”: networkPlugin cni failed to set up pod “coredns-6d8c4cb4d-6b5k2_kube-system” network: failed to delegate add: failed to set bridge addr: “cni0” already has an IP address different from 10.96.0.1/24
Warning FailedCreatePodSandBox 22m kubelet Failed to create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container “af99fa1e894c368ee7b252d792829065ef31b2bb3bc71f90e2d7fa00259c7218” network for pod “coredns-6d8c4cb4d-6b5k2”: networkPlugin cni failed to set up pod “coredns-6d8c4cb4d-6b5k2_kube-system” network: failed to delegate add: failed to set bridge addr: “cni0” already has an IP address different from 10.96.0.1/24
Normal SandboxChanged 8m3s (x411 over 23m) kubelet Pod sandbox changed, it will be killed and re-created.
Warning FailedCreatePodSandBox 3m2s (x540 over 22m) kubelet (combined from similar events): Failed to create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container “922a94bed6b5fc4d4bc2015a97af9242f2c0c062380a7d42e6824518ee05bfbe” network for pod “coredns-6d8c4cb4d-6b5k2”: networkPlugin cni failed to set up pod “coredns-6d8c4cb4d-6b5k2_kube-system” network: failed to delegate add: failed to set bridge addr: “cni0” already has an IP address different from 10.244.0.1/24
自己初始化master的命令为：
kubeadm init --pod-network-cidr=10.244.0.0/16 --image-repository registry.aliyuncs.com/google_containers
也就是pod 的网络范围为： 10.244.0.0/16
注意：
/etc/kubernetes/manifests/kube-controller-manager.yaml 中，也有以下参数设置pod的网络范围：
- --cluster-cidr=10.244.0.0/16
在看下本地虚拟网卡cni0的的网络ip：
ifconfig
解决方法：
方法1: 修改 cni0 的 ip段：
使用 ip address 命令，具体使用可参考相关语法
方法2： 将这个错误的网卡删除掉，系统会自动重建。
下面我们删除错误的cni0，然后让它自己重建，操作过程如下：
ifconfig cni0 down
ip link delete cni0
结果：
