mysql的安装，关于/etc/init.d/下没有mysqld的命令，及php与mysql的连接测试
yum install php php-mysql mysqlyum install mysql-server //这个必须安装，才会有/etc/init.d的mysqld
mysql 使用的端口为3306
注意1.我们验证php程序执行环境
方法，在DoucumentRoot路径下建个test.php文件
用浏览器浏览后有php的页面显示。
2.测试php程序与mysql通信
方法，在 test.php文件中修改
若出现报错：SQLSTATE Can't connect to MySQL server on 'XXX' (13)
这是SELinux不允许访问外网，
简单点就可以使用setenfroce=0;就可以了。
或者： 使用命令getsebool - get SELinux boolean value(s)
命令 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_dbus_sssd --> off
httpd_enable_cgi --> on
httpd_enable_ftp_server --> off
httpd_enable_homedirs --> off
httpd_execmem --> off
httpd_manage_ipa --> off
httpd_read_user_content --> off
httpd_run_preupgrade --> off
httpd_run_stickshift --> off
httpd_serve_cobbler_files --> off
httpd_setrlimit --> off
httpd_ssi_exec --> off
httpd_tmp_exec --> off
httpd_tty_comm --> on
httpd_unified --> on
httpd_use_cifs --> off
httpd_use_fusefs --> off
httpd_use_gpg --> off
httpd_use_nfs --> off
httpd_use_openstack --> off
httpd_verify_dns --> off
注意这里httpd_can_network_connect --> off
这里设置使用命令setsebool httpd_can_network_connect 1
PS: 1. 若出现错误Lost connection to MySQL server at 'reading initial communication packet', system error: 111
有可能是mysql服务没打开，可用命令service mysqld start
2.若出现错误ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.18.9' (113)
很可能是防火墙的问题
iptables -F
iptables -L
这样就解决了
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