以下為一個簡易的網路架構，主要強調公私有網路下的AWS環境，此一設計主要是讓私有網路路由不到網路，而公有網路能夠路由到外網，此一設計通常是為了保護不需要直接提供使用者直連的服務或裝置。
示意圖
建置環境
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provider "aws" {
region = "us-west-2"
}
resource "aws_vpc" "vpc" {
cidr_block = "10.0.0.0/16"
tags = {
Name = "vpc"
}
}
resource "aws_subnet" "subnet" {
vpc_id = aws_vpc.vpc.id
cidr_block = "10.0.1.0/24"
availability_zone = "us-west-2a"
map_public_ip_on_launch = true
tags = {
Name = "subnet"
}
}
resource "aws_subnet" "subnet-private" {
vpc_id = aws_vpc.vpc.id
cidr_block = "10.0.2.0/24"
availability_zone = "us-west-2a"
tags = {
Name = "subnet-private"
}
}
resource "aws_route_table_association" "rta" {
subnet_id = aws_subnet.subnet.id
route_table_id = aws_route_table.rt.id
}
resource "aws_route_table" "rt" {
vpc_id = aws_vpc.vpc.id
route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.igw.id
}
tags = {
Name = "rt"
}
}
resource "aws_internet_gateway" "igw" {
vpc_id = aws_vpc.vpc.id
tags = {
Name = "igw"
}
}
resource "aws_security_group" "sg" {
name = "sg"
vpc_id = aws_vpc.vpc.id
ingress {
from_port = 22
to_port = 22
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
tags = {
Name = "sg"
}
}
resource "aws_instance" "ec2" {
ami = "ami-0747e613a2a1ff483"
instance_type = "t2.micro"
key_name = "demo-key-us-west-2"
subnet_id = aws_subnet.subnet.id
vpc_security_group_ids = [aws_security_group.sg.id]
tags = {
Name = "ec2"
}
}
resource "aws_instance" "ec2-private" {
ami = "ami-0747e613a2a1ff483"
instance_type = "t2.micro"
key_name = "demo-key-us-west-2"
subnet_id = aws_subnet.subnet-private.id
vpc_security_group_ids = [aws_security_group.sg.id]
tags = {
Name = "ec2-private"
}
}
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測試
在public subnet中的ec2可正常連網
利用預設路由(也就是vpc被建立時就被建立的路由)來透過public subnet中的ec2連線在private subnet中的ec2
在private subnet中的ec2無法正常連網
後記 : 上傳key到ec2
由於public subnet中的ec2沒有key，這樣會無法ssh到private subnet中的ec2，因此可以透過scp將key上傳。
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scp -i ./demo-key-us-west-2.pem ./demo-key-us-west-2.pem ec2-user@34.221.228.11:/home/ec2-user/tmp.pem
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