问题：

wordpress更换服务器后，出现can't connect to MySQL server using '' (13)的错误，结果是 SELinux 不让 httpd 访问外网，一开始还以为是iptables造成的，关闭之后发现还是不行。

 

原因：

#getsebool -a | grep httpd

 

[root@centos]#getsebool -a | grep httpd

allow_httpd_anon_write --> off

allow_httpd_mod_auth_ntlm_winbind --> off

allow_httpd_mod_auth_pam --> off

allow_httpd_sys_script_anon_write --> off

httpd_builtin_scripting --> on

httpd_can_check_spam --> off

httpd_can_network_connect --> off

httpd_can_network_connect_cobbler --> off

httpd_can_network_connect_db --> off

httpd_can_network_memcache --> off

httpd_can_network_relay --> off

httpd_can_sendmail --> off

httpd_dbus_avahi --> on

httpd_enable_cgi --> on

httpd_enable_ftp_server --> off

httpd_enable_homedirs --> off

httpd_execmem --> off

httpd_read_user_content --> off

httpd_setrlimit --> off

httpd_ssi_exec --> off

httpd_tmp_exec --> off

httpd_tty_comm --> on

httpd_unified --> off

httpd_use_cifs --> off

httpd_use_gpg --> off

httpd_use_nfs --> off

 

发现 httpd_can_network_connect_db --> off

 

解决方案：

#/usr/sbin/setsebool -P httpd_can_network_connect_db on