查看端口是否开放
firewall-cmd --list-all vim /etc/firewalld/zones/public.xml #开放端口访问 <port protocol="tcp" port="1521"/> #重启 systemctl restart firewalld
firewall-cmd --list-all vim /etc/firewalld/zones/public.xml #开放端口访问 <port protocol="tcp" port="1521"/> #重启 systemctl restart firewalld