K8S安装网络插件问题修复
卸载flannel网络步骤：
#第一步，在master节点删除flannel
kubectl delete -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl delete -f kube-flannel.yml
#第二步，在node节点清理flannel网络留下的文件
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1
rm -rf /var/lib/cni/
rm -f /etc/cni/net.d/*
注：执行完上面的操作，重启kubelet
ifconfig cni0 down
ip link delete cni0
[root@master ~]# ifconfig vethb22xxxxx down (只复制@前面的串就行)
[root@master ~]# ip link delete vethb22xxxxx
[root@master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 52:54:00:a5:74:7f brd ff:ff:ff:ff:ff:ff
altname enp0s5
altname ens5
inet 123.12.0.10/24 brd 123.12.0.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:21:50:e2:be brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
19: vethc12d83a@if18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default
link/ether b6:0c:87:e3:4c:fc brd ff:ff:ff:ff:ff:ff link-netnsid 0
86: vethb22xxxxx@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP group default
link/ether d6:4b:f8:fb:8f:38 brd ff:ff:ff:ff:ff:ff link-netns cni-c4dc8844-6897-7862-5367-f7ef4b6acc90
#ip a 命令 看不到cni0的问题
cni0找不到，是因为本节点上没有运行的pod，在该节点上运行一个pod就出来了
查看kubelet日志
journalctl -xefu kubelet
#异常，error: cni plugin not initialized
Nov 07 16:12:56 VM-0-5-centos kubelet[2278204]: E1107 16:12:56.747955 2278204 kubelet.go:2855] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:Network plugin returns error: cni plugin not initialized"
kubectl apply -f kube-flannel.yml
#10-flannel.conflist 这个文件有时候初始化有问题，需要自己补上
参考：k0s错误cni plugin not initialized
cat <<EOL > /etc/cni/net.d/10-flannel.conflist
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
EOL
#查看conflist
cat /etc/cni/net.d/10-flannel.conflist
ifconfig cni0
修改containerd的镜像endpoint
编辑vim /etc/crictl.yaml
编辑/etc/crictl.yaml文件, 修改, 主要是新版本增加的image-endpoint
runtime-endpoint: "unix:///run/containerd/containerd.sock"
image-endpoint: "unix:///run/containerd/containerd.sock" #与上边runtime-endpoint一致即可
timeout: 10
debug: false
pull-image-on-create: false
disable-pull-on-run: false
加载
systemctl daemon-reload
systemctl restart kubelet
crictl image
配置 containerd cgroup 驱动程序 systemd（所有节点）
原文链接：Kubernetes 1.24 高可用集群部署
kubernets 自ｖ 1.24.0 后，就不再使用 docker.shim，替换采用 containerd 作为容器运行时端点。因此需要安装 containerd（在 docker 的基础下安装），上面安装 docker 的时候就自动安装了 containerd 了。这里的 docker 只是作为客户端而已。容器引擎还是 containerd。
cat /etc/containerd/config.toml | grep -n**"SystemdCgroup"**
sed -i 's#SystemdCgroup = false#SystemdCgroup = true#g' /etc/containerd/config.toml
应用所有更改后,重新启动containerd
systemctl restart containerd
如果该文件没有，则需要生成一下，并且images也需要修改
生成 containerd 的默认配置文件
containerd config default > /etc/containerd/config.toml
查看 sandbox 的默认镜像仓库在文件中的第几行
cat /etc/containerd/config.toml | grep -n "sandbox_image"
使用 vim 编辑器 定位到 sandbox_image，将 仓库地址修改成 registry.aliyuncs.com/google_containers/pause:3.6
vim /etc/containerd/config.toml
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"
重启 containerd 服务
systemctl daemon-reload
systemctl restart containerd.service
#加入节点
kubeadm join 123.12.0.23:6443 --token nacoen.xxxxxxxxxxx
--discovery-token-ca-cert-hash sha256:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
#以前加入过，有异常
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists
[ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists
直接删除
rm -f /etc/kubernetes/kubelet.conf
rm -f /etc/kubernetes/pki/ca.crt
将主节点的.kube目录复制过来，再重新加入
#加入超时
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
[kubelet-check] Initial timeout of 40s passed.
参考：https://blog.csdn.net/gs80140/article/details/92798027
swapoff -a # will turn off the swap
** kubeadm reset**
systemctl daemon-reload
systemctl restart kubelet
iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X # will reset iptables
重置之后再重新加入
scp -rP 你的sshd端口号（默认是22） root@123.12.0.23:/root/.kube /root/.kube
从节点镜像
#kube-flannel.yml也会用到镜像，可根据网络情况调整配置
cat kube-flannel.yml |grep image
image: docker.io/flannel/flannel-cni-plugin:v1.2.0
image: docker.io/flannel/flannel:v0.22.3
image: docker.io/flannel/flannel:v0.22.3
#从节点的镜像
[root@node02 ~]# crictl images
IMAGE TAG IMAGE ID SIZE
docker.io/flannel/flannel-cni-plugin v1.2.0 xxxxxxxxxxxxxxx 3.88MB
docker.io/flannel/flannel v0.22.3 xxxxxxxxxxxxxxx 27MB
registry.aliyuncs.com/google_containers/kube-proxy v1.28.2 xxxxxxxxxxxxxxx 24.6MB
registry.aliyuncs.com/google_containers/pause 3.6 xxxxxxxxxxxxxxx 302kB
重启服务，查看状态
systemctl restart --now kubelet
systemctl status kubelet.service --now
#主节点启动后install-cni-plugin install-cni 这两个容器貌似启动了一下就退出，估计是为了把kube-flannel等其它容器 拉起来
[root@VM-0-5-centos ~]# crictl ps -a
CONTAINER IMAGE CREATED STATE NAME ATTEMPT POD ID POD
xxxxxxxxxxxx xxxxxxxxxx 35 seconds ago Running kube-flannel 0 xxxxxxxxxxx kube-flannel-ds-swtg5
xxxxxxxxxxxx xxxxxxxxxx 36 seconds ago Exited install-cni 0 xxxxxxxxxxx kube-flannel-ds-swtg5
xxxxxxxxxxxx xxxxxxxxxx 36 seconds ago Exited install-cni-plugin 0 xxxxxxxxxxx kube-flannel-ds-swtg5
xxxxxxxxxxxx xxxxxxxxxx 54 seconds ago Running kube-proxy 0 xxxxxxxxxxx kube-proxy-9rt8f
xxxxxxxxxxxx xxxxxxxxxx About a minute ago Running kube-controller-manager 1 xxxxxxxxxxx kube-controller-manager-master01
xxxxxxxxxxxx xxxxxxxxxx About a minute ago Running kube-scheduler 1 xxxxxxxxxxx kube-scheduler-master01
xxxxxxxxxxxx xxxxxxxxxx About a minute ago Running etcd 1 xxxxxxxxxxx etcd-master01
xxxxxxxxxxxx xxxxxxxxxx About a minute ago Running kube-apiserver 1 xxxxxxxxxxx
测试创建一个临时pod
kubectl create deployment testapp --image=nginx -n kube-public
kubectl describe deployment.apps -n kube-public
kubectl describe replicaset.apps -n kube-public
kubectl describe pod/testapp-xxxxxxxxxx-2qh9n -n kube-public
kubectl exec -it pod名 -c 容器名 bash/sh #区别于docker exec只能登入本机的docker
#如果pod中只有一个容器，则无需-c指定
kubectl exec -it pod名 -c 容器名 -- 命令 #可以实现不进入容器执行 -- 后的命令
kubectl exec -it testapp-xxxxxxxxxx-2qh9n /bin/bash
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