1.安装docker卸载旧版本sudo yum remove docker \docker-client \docker-client-latest \docker-common \docker-latest \docker-latest-logrotate \docker-lo

互相可以ping通。例如ping k8s-master-20ping k8s-slave-node-21。vim /etc/fstab# 永久。注释这一行 # /dev/mapper/centos-swap swap。sed -i ‘s/enforcing/disabled/’ /etc/selinux/config# 永久。free -m #用来检测是否设置好。swapoff -a# 临时。da