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### Configure NAT instance Example | ||
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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. | ||
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### Get up and running | ||
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* Planning phase | ||
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terraform plan | ||
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* Apply phase | ||
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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 | ||
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* Apply phase | ||
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+ 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 | ||
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* Destroy | ||
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terraform destroy |
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resource "alicloud_vpc" "main" { | ||
cidr_block = "${var.vpc_cidr}" | ||
} | ||
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resource "alicloud_vswitch" "main" { | ||
vpc_id = "${alicloud_vpc.main.id}" | ||
cidr_block = "${var.vswitch_cidr}" | ||
availability_zone = "${var.zone}" | ||
depends_on = ["alicloud_vpc.main"] | ||
} | ||
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resource "alicloud_route_entry" "entry" { | ||
router_id = "${alicloud_vpc.main.router_id}" | ||
route_table_id = "${alicloud_vpc.main.router_table_id}" | ||
destination_cidrblock = "0.0.0.0/0" | ||
nexthop_type = "Instance" | ||
nexthop_id = "${alicloud_instance.nat.id}" | ||
} | ||
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resource "alicloud_instance" "nat" { | ||
image_id = "${var.image}" | ||
instance_type = "${var.instance_nat_type}" | ||
availability_zone = "${var.zone}" | ||
security_groups = ["${alicloud_security_group.group.id}"] | ||
vswitch_id = "${alicloud_vswitch.main.id}" | ||
instance_name = "nat" | ||
io_optimized = "optimized" | ||
system_disk_category = "cloud_efficiency" | ||
password= "${var.instance_pwd}" | ||
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depends_on = ["alicloud_instance.worker"] | ||
user_data = "${data.template_file.shell.rendered}" | ||
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tags { | ||
Name = "ecs-nat" | ||
} | ||
} | ||
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data "template_file" "shell" { | ||
template = "${file("userdata.sh")}" | ||
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vars { | ||
worker_private_ip = "${alicloud_instance.worker.private_ip}" | ||
vswitch_cidr = "${var.vswitch_cidr}" | ||
} | ||
} | ||
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resource "alicloud_instance" "worker" { | ||
image_id = "${var.image}" | ||
instance_type = "${var.instance_worker_type}" | ||
availability_zone = "${var.zone}" | ||
security_groups = ["${alicloud_security_group.group.id}"] | ||
vswitch_id = "${alicloud_vswitch.main.id}" | ||
instance_name = "worker" | ||
io_optimized = "optimized" | ||
system_disk_category = "cloud_efficiency" | ||
password= "${var.instance_pwd}" | ||
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tags { | ||
Name = "ecs-worker" | ||
} | ||
} | ||
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resource "alicloud_eip" "eip" { | ||
} | ||
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resource "alicloud_eip_association" "attach" { | ||
allocation_id = "${alicloud_eip.eip.id}" | ||
instance_id = "${alicloud_instance.nat.id}" | ||
} | ||
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resource "alicloud_security_group" "group" { | ||
name = "terraform-test-group" | ||
description = "New security group" | ||
vpc_id = "${alicloud_vpc.main.id}" | ||
} | ||
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resource "alicloud_security_group_rule" "allow_in" { | ||
security_group_id = "${alicloud_security_group.group.id}" | ||
type = "ingress" | ||
cidr_ip= "0.0.0.0/0" | ||
policy = "accept" | ||
ip_protocol= "all" | ||
nic_type= "intranet" | ||
port_range= "-1/-1" | ||
priority= 1 | ||
} | ||
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resource "alicloud_security_group_rule" "allow_out" { | ||
security_group_id = "${alicloud_security_group.group.id}" | ||
type = "egress" | ||
cidr_ip= "0.0.0.0/0" | ||
policy = "accept" | ||
ip_protocol= "all" | ||
nic_type= "intranet" | ||
port_range= "-1/-1" | ||
priority= 1 | ||
} |
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output "nat_instance_id" { | ||
value = "${alicloud_instance.nat.id}" | ||
} | ||
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output "nat_instance_private_ip" { | ||
value = "${alicloud_instance.nat.private_ip}" | ||
} | ||
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output "nat_instance_eip_address" { | ||
value = "${alicloud_eip.eip.ip_address}" | ||
} | ||
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output "worker_instance_id" { | ||
value = "${alicloud_instance.worker.id}" | ||
} | ||
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output "worker_instance_private_ip" { | ||
value = "${alicloud_instance.worker.private_ip}" | ||
} |
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#!/bin/sh | ||
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PostRouting=${vswitch_cidr} | ||
SourceRouting=`ifconfig eth0|grep inet|awk '{print $2}'|tr -d 'addr:'` | ||
echo ${worker_private_ip}>> /etc/sysctl.conf | ||
echo 'net.ipv4.ip_forward=1'>> /etc/sysctl.conf | ||
sysctl -p | ||
iptables -t nat -I POSTROUTING -s $PostRouting -j SNAT --to-source $SourceRouting | ||
iptables -t nat -I PREROUTING -d $SourceRouting -p tcp --dport 80 -j DNAT --to ${worker_private_ip} |
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variable "vpc_cidr" { | ||
default = "10.1.0.0/21" | ||
} | ||
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variable "vswitch_cidr" { | ||
default = "10.1.1.0/24" | ||
} | ||
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variable "zone" { | ||
default = "cn-beijing-c" | ||
} | ||
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variable "image" { | ||
default = "ubuntu_140405_64_40G_cloudinit_20161115.vhd" | ||
} | ||
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variable "instance_nat_type" { | ||
default = "ecs.n1.small" | ||
} | ||
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variable "instance_worker_type" { | ||
default = "ecs.s2.large" | ||
} | ||
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variable "instance_pwd" { | ||
default = "Test123456" | ||
} |
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output "hostname" { | ||
value = "${alicloud_instance.website.instance_name}" | ||
} | ||
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output "ecs_id" { | ||
value = "${alicloud_instance.website.id}" | ||
} | ||
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output "ecs_public_ip" { | ||
value = "${alicloud_instance.website.public_ip}" | ||
} |
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