Virtualbox cannot access the Internet after centos is installed

1. Set the network connection mode of virtualbox. For example, if you use the bridge mode, the network adapter that is bridging is the network adapter that the host is surfing the Internet. Now I use wireless connection, select 1x1 11b/g/n Wireless lan pci Express Half Mini Card Adapter.

2. Run dhclient eth0 in the command line. The ip address is automatically allocated to eth0. So every time you restart the computer to manually run dhclient eth0 to get the ip, to make it automatically get the need to modify/etc/sysconfig/network-scripts/ifcfg-eth0 after the system starts, change ONBOOT = "no" to ONBOOT = "yes ".