======= network part =======
1.设置桥接模式
2.vi /etc/sysconfig/network-scripts/ifcfg-enp0s3
BOOTPROTO=static
IPADDR=192.168.1.21
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
ONBOOT=yes
3.vi /etc/resolv.conf
nameserver 4.2.2.2
4.systemctl restart network
5.ip addr
6.curl http://baidu.com
7.vi /etc/hosts
127.0.0.1 localhost
::1 localhost
192.168.1.21 node1
192.168.1.22 node2
192.168.1.23 node3
192.168.1.24 node4
======= jdk part =======
1.yum install -y java-1.8.0-openjdk-devel
VirtualBox Centos7 basic devel setting
原文：https://www.cnblogs.com/xiayudashan/p/10494725.html