Pulumi - Create AWS EC2 instance (new VPC)

Introduction

In this post, we used Pulumi to create an EC2 instance in the default VPC. Then, in this post, we created a small variation in which we launched an EC2 instance in a pre-existing VPC and subnet. In this post, we will create yet another variant in which we will launch an EC2 instance in a VPC and subnet that we will also create through Pulumi.

Begin situation

Let’s have a look at the begin situation. In the AWS console, you see the current configured VPC’s and subnets:

VPCs:

pulumi

Subnets:

pulumi

Pulumi Code

Next, let’s have a look at the code. It’s fairly similar to the previous posts, see here and here. Few things are different though:

1) We create a new VPC through the aws.ec2.Vpc function (see documentation here) 2) We create a subnet under that VPC using the aws.ec2.Subnet function (see documentation here) 3) To ensure the EC2 instance is created under that subnet, we need to pass the subnet_id in the aws.ec2.Instance function.

import pulumi
import pulumi_aws as aws

size = 't3.micro'

user_data = """#!/bin/bash
echo "Hello, World!" > index.html
nohup python -m SimpleHTTPServer 8080 &
"""

ami = aws.ec2.get_ami(most_recent="true",
                  owners=["137112412989"],
                  filters=[{"name":"name","values":["amzn-ami-hvm-*"]}])

my_vpc = aws.ec2.Vpc("myVpc",
    cidr_block="172.16.0.0/16",
    tags={
        "Name": "pulumi-new-vpc",
    })

my_subnet = aws.ec2.Subnet("mySubnet",
    vpc_id=my_vpc.id,
    cidr_block="172.16.10.0/24",
    availability_zone="eu-central-1a",
    map_public_ip_on_launch=True,
    tags={
        "Name": "pulumi-new-subnet",
    })

group = aws.ec2.SecurityGroup('pulumi_allow_8080',
            vpc_id=my_vpc.id,
            description='Enable access to port 8080',
            ingress=[
                { 'protocol': 'tcp', 'from_port': 8080, 'to_port': 8080, 'cidr_blocks': ['0.0.0.0/0'] },
                { 'protocol': 'tcp', 'from_port': 22, 'to_port': 22, 'cidr_blocks': ['0.0.0.0/0'] }
            ])

server = aws.ec2.Instance('webserver',
    instance_type=size,
    vpc_security_group_ids=[group.id], 
    ami=ami.id,
    subnet_id=my_subnet.id,
    user_data = user_data,
    tags = { "Name": "Pulumi" },
    )
    

pulumi.export('publicIp', server.public_ip)
pulumi.export('publicHostName', server.public_dns)

Deployment

Next, let’s deploy our resources using the pulumi up command.

/Webserver/Pulumi_newVPC❯ pulumi up                                    
Please choose a stack, or create a new one: dev
Previewing update (dev)

View Live: https://app.pulumi.com/wiwa1978/aws_ec2_wim/dev/previews/67108f93-f157-48b3-888c-d402fa23c6b3

     Type                      Name               Plan       
 +   pulumi:pulumi:Stack       aws_ec2_wim-dev    create     
 +   ├─ aws:ec2:Vpc            myVpc              create     
 +   ├─ aws:ec2:Subnet         mySubnet           create     
 +   ├─ aws:ec2:SecurityGroup  pulumi_allow_8080  create     
 +   └─ aws:ec2:Instance       webserver          create     
 
Resources:
    + 5 to create

Do you want to perform this update? yes
Updating (dev)

View Live: https://app.pulumi.com/wiwa1978/aws_ec2_wim/dev/updates/1

     Type                      Name               Status      
 +   pulumi:pulumi:Stack       aws_ec2_wim-dev    created     
 +   ├─ aws:ec2:Vpc            myVpc              created     
 +   ├─ aws:ec2:Subnet         mySubnet           created     
 +   ├─ aws:ec2:SecurityGroup  pulumi_allow_8080  created     
 +   └─ aws:ec2:Instance       webserver          created     
 
Outputs:
    publicIp      : "3.126.120.156"

Resources:
    + 5 created

Duration: 34s

In the next screenshot, you will see that the VPC has been created:

pulumi

Also the subnet has been created successfully:

pulumi

And finally the EC2 instance is created and is located in the correct subnet and VPC.

pulumi

Hope you enjoyed this little blog post. You can find the code here.