重新初始化k8s集群
执行如下命令,所有节点都执行
kubeadm reset
初始化集群,仅在master(centos01)上执行
[root@centos01 opt] kubeadm init --apiserver-advertise-address 192.168.109.130 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.27.1 --pod-network-cidr=10.244.0.0/16
...
...
...
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.109.130:6443 --token osh87v.zvo010kamsr8esmp \
--discovery-token-ca-cert-hash sha256:ff4607c7c194e9f756b1eb509e64d2d926b5f8f9556a85c3c14a2d25add28230
其中,
–apiserver-advertise-address:通告侦听地址
–image-repository:指定镜像地址使用阿里云的,默认会使用谷歌镜像
–kubernetes-version:指定当前的kubernetes的版本
–pod-network-cidr=10.244.0.0/16:flannel网络的固定地址范围
仔细阅读kubeadm init执行的结果,根据提示,还需要进行3步操作
1.笔者用的是root用户,仅在master节点执行
[root@centos01 opt] vim /etc/profile
在最后一行增加
export KUBECONFIG=/etc/kubernetes/admin.conf
生效环境变量
[root@centos01 opt] source /etc/profile
2.安装网络插件,可以选择calico或flannel,这里选择安装flannel,仅在master节点执行
下载安装文件
[root@centos01 opt] wget https://github.com/flannel-io/flannel/releases/latest/download/kube-flannel.yml
修改配置
[root@centos01 opt] vim kube-flannel.yml
修改Network项的值,改为和--pod-network-cidr一样的值
"Network": "10.244.0.0/16"
由于有时国内网络的问题,需要修改image的地址,把所有的docker.io改为dockerproxy.com
共需要修改3处,两个值
image: dockerproxy.com/flannel/flannel:v0.22.0
image: dockerproxy.com/flannel/flannel-cni-plugin:v1.1.2
安装网络插件
[root@centos01 opt] kubectl apply -f kube-flannel.yml
验证安装
[root@centos01 opt] kubectl get pods -n kube-flannel
NAME READY STATUS RESTARTS AGE
kube-flannel-ds-dfngh 1/1 Running 17 (13m ago) 6d1h
kube-flannel-ds-qll8g 1/1 Running 12 (13m ago) 6d1h
3.其他节点加入集群,非master节点都执行
[root@centos02 opt] kubeadm join 192.168.109.130:6443 --token osh87v.zvo010kamsr8esmp --discovery-token-ca-cert-hash sha256:ff4607c7c194e9f756b1eb509e64d2d926b5f8f9556a85c3c14a2d25add28230
验证安装结果,仅在master节点执行
[root@centos01 opt] kubectl get nodes
NAME STATUS ROLES AGE VERSION
centos01 Ready control-plane 134m v1.27.1
centos02 Ready <none> 133m v1.27.1
[root@centos01 opt] kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-7bdc4cb885-l4vs2 1/1 Running 0 9m3s
coredns-7bdc4cb885-wzc8x 1/1 Running 0 9m3s
etcd-centos01 1/1 Running 0 9m18s
kube-apiserver-centos01 1/1 Running 0 9m18s
kube-controller-manager-centos01 1/1 Running 0 9m19s
kube-proxy-m92hr 1/1 Running 0 28s
kube-proxy-pv4hw 1/1 Running 0 9m3s
kube-scheduler-centos01 1/1 Running 0 9m18s
重启一遍所有服务器节点,有可能会暴露出来隐藏的问题,再次验证以上结果,仍然正常。
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