Xiao Bai's confusion about Apache is caused by chkconfig-how to check whether the program has been installed/successfully installed

This article briefly describes Apache's idiot-level problems

1 Relationship between APACHE and httpd

According to the Internet, it is complicated. However, I prefer to believe that httpd is a single Apache process about the HTTP service. It means that httpd belongs to Apache, and Apache contains not only httpd.

2 chkconfig -- levels 235 httpd on

Httpd is started randomly when the running level is 2, 3, and 5.

(A little question about chkconfig: The Association caused by chkconfig-how to check whether the program has been installed/successfully installed)

3 manually start httpd

/Usr/sbin/httpd

/Etc/init. d/httpd start

Service httpd start

All three methods are supported.

4.KeyProblem --Firewall

Sometimes Apache is successfully started, but the client browser still cannot access it. It is best to turn off the firewall first. This is a simple but critical issue that many people have not said on the Internet. It is not done until you have consulted a master.

Service iptables stop

This command should be the same as/etc/init. d/iptables stop.

Or

VI/etc/sysconfig/iptables

Add the following line to allow the firewall to release port 80

-A RH-Firewall-1-INPUT-p tcp-M state -- state new-m tcp -- dport 80-J accept

Service iptables restart Firewall

 

Finally, access is successful.