执行命令：
getsebool -a|grep httpd
发现
httpd_can_network_connect off
解决：
setsebool httpd_can_network_connect && setsebool httpd_can_network_connect_cobbler && setsebool httpd_can_network_connect_db && setsebool httpd_can_network_relay
需要重新启动httpd
systemctl restart httpd.service