terraform/examples/alicloud-ecs-nat/README.md

Configure NAT instance Example

In the Virtual Private Cloud（VPC） environment, to enable multiple back-end intranet hosts to provide services externally with a limited number of EIPs, map the ports on the EIP-bound host to the back-end intranet hosts.

Get up and running

• Planning phase

    terraform plan 
  

• Apply phase

    terraform apply 
  
    Get the outputs:
    + nat_instance_eip_address = 123.56.19.238
    + nat_instance_private_ip = 10.1.1.57
    + worker_instance_private_ip = 10.1.1.56
  

• Apply phase

    + login the vm: ssh root@123.56.19.238|Test123456
    + Run the "iptables -t nat -nvL" command to check the result
  
      | prot | in |   source    |  destination   |                          |
      | ---- | -- | ----------- | -------------- | ------------------------ |
      | tcp  | *  | 0.0.0.0/0   |  10.1.1.57     |  tcp dpt:80 to:10.1.1.56
      | all  | *  | 10.1.1.0/24 |  0.0.0.0/0     |  to:10.1.1.57
  

• Destroy

    terraform destroy