Elastic IPs

For Allocate public IP from private IP. Public IP does not change when you reboot EC2 instance.

Allocate Public IP for EC2 Instance

Click Allocate Elastic IP address

Click Allocate

Actions → Associate Elastic IP address

Select Resource type → Instance

Search EC2 Instance(ice4-dev)

Also, Set private IP(Easy to find from input box)

Success to allocate public ip.