甲骨文开放所有端口

Ubuntu系统

##开放所有端口
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -F
Ubuntu镜像默认设置了Iptable规则，关闭它
apt-get purge netfilter-persistent
reboot
或者强制删除
rm -rf /etc/iptables && reboot

Centos系统

##删除多余附件
systemctl stop oracle-cloud-agent
systemctl disable oracle-cloud-agent
systemctl stop oracle-cloud-agent-updater
systemctl disable oracle-cloud-agent-updater
停止firewall
systemctl stop firewalld.service
禁止firewall开机启动
systemctl disable firewalld.service