What if CentOS cannot access the Internet?

The reason is that port 80 is not enabled.

The CentOS firewall cannot be used when APACHE is installed on the CENTOS of the VM. The solution is as follows:

/Sbin/iptables-IINPUT-ptcp -- dport80-jACCEPT
/Sbin/iptables-IINPUT-ptcp -- dport22-jACCEPT

Then save:

/Etc/rc. d/init. d/iptablessave

After the computer is restarted, The CentOS firewall has opened ports 80 and 22 by default.

You may not restart the computer either here:

/Etc/init. d/iptablesrestart

Close the CentOS firewall and disable its services:

View CentOS Firewall Information:/etc/init. d/iptablesstatus

Disable CentOS Firewall Service:/etc/init. d/iptablesstop

Permanently close? I don't know how to use the permanent method:

Chkconfig-level35iptablesoff