Cut the crap,just jump to the conclusion.
The ORACLE CLOUD
1.Sign in to Oracle Cloud
Below are the registered link addresses for different regions and countries.Be sure to use the link of the corresponding region, DO NOT use the VPN connection, otherwise the registration may fail.
ORACLE-USA
ORACLE-Japan
ORACLE-Australia
ORACLE-China
ORACLE-Korea
ORACLE-Taiwan
Follow the prompts to register step by step. then after registration,
2.Connect to the server using an SSH client
Here are some clients can be used,
3.Open ports
sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -F