ubuntu使用kubeadm安装配置k8s(Kubernetes)

安装

翻墙使用root权限执行以下内容或者参考这里

wget https://coding.net/u/scaffrey/p/hosts/git/raw/master/hosts 
cp hosts /etc/hosts

安装

apt-get update && apt-get install -y apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y docker.io
apt-get install -y kubelet kubeadm kubectl kubernetes-cni

配置master节点

在master节点执行以下命令

kubeadm init  --pod-network-cidr 10.244.0.0/16

使master node参与工作负载

kubectl taint nodes --all node-role.kubernetes.io/master-

安装网络

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

配置worker节点

执行初始化master节点后打印的最后一行

kubeadm reset
kubeadm join --token 6aa93f.04f7fbce49b7f3bb 222.20.101.106:6443

使用

使用kubectl的run命令创建deployment

kubectl run nginx --image=nginx:1.10.0
kubectl get pods -o wide

使用expose 将端口暴露出来

kubectl expose deployment nginx --port 80 --type LoadBalancer
kubectl get services -o wide

通过scale命令扩展应用

kubectl scale deployments/nginx --replicas=4
kubectl get pods -o wide

创建nginx版本

更新应用镜像，滚动更新应用镜像

kubectl set image deployments/nginx nginx=qihao/nginx

确认更新

kubectl rollout status deployments/nginx 

回滚到之前版本

kubectl rollout undo deployments/nginx 

负载均衡（不停的刷新服务的地址，过段时间会有变化）

kubectl exec -it nginx-2027219757-r1sqm bash
uname -n > /usr/share/nginx/html/index.html 

结束

kubectl delete deployment nginx && kubectl delete service nginx
kubectl get services -o wide
kubectl get pods -o wide
kubectl get nodes