In CentOS, php under httpd can connect to the mysql local machine, and 127.0.0.1 cannot be accessed.

The code you see in this article comes from www. cnblogs. comayanmwphp: $ server127.0.0.1; println (Begin); $ linkmysql_connect ($ server, mysql, mysql); if (! $ Link) {die (Couldnotconnect:. mysql_error (). mysql_errno ();}

The article you see from the http://www.cnblogs.com/ayanmw php code is very simple: $ server = "127.0.0.1"; println ("Begin"); $ link = mysql_connect ($ server, "mysql ", "mysql"); if (! $ Link) {die ('could not connect: '. mysql_error (). mysql_errno ();} enabled in linux

The article you see comes from http://www.cnblogs.com/ayanmw

Php code is simple:

$server="127.0.0.1";println("Begin");$link = mysql_connect($server,"mysql","mysql");if (!$link) {    die('Could not connect: ' . mysql_error().mysql_errno());}

In linux, you can use php mysql. php to view the running result, but an error is reported in my windows browser:

Cocould not connect: Can't connect to MySQL server on '2017. 0.0.1 '(13) 127

Cause:
# Getsebool-a | grep httpd
[Neo @ neo phpMyTest] $ getsebool-a | grep httpd

Httpd_can_network_connect --> off
Solution:
# Setsebool httpd_can_network_connect 1

It turns out to be SELINUX, so I usually disable SELINUX and iptables ip6tables directly.

# Disable SELINUXchkconfig -- level 12345 iptables offchkconfig -- level 12345 ip6tables offservice iptables stopservice ip6tables stop to view the SELinux status: 1./usr/sbin/sestatus-v # If The SELinux status parameter is enabled, SELinux status: enabled2 and getenforce # Can be used to check whether SELinux is disabled: 1. temporarily shut down (no need to restart the machine): setenforce 0 # Set SELinux to permissive mode # setenforce 1 Set SELinux to enforcing Mode 2. modify the configuration file and restart the machine: modify the/etc/selinux/config file and change SELINUX = enforcing to SELINUX = disabled.